{"title":"4 Channel Amplifiers","description":"\u003cdiv class=\"ai-collection-block ai-cat-amplifiers\"\u003e\n\n\u003ch2\u003eHow to Choose a 4-Channel Amplifier\u003c\/h2\u003e\n\n\u003cp\u003eThere are more 4-channel amps on the market than any other type, and the spec sheets are written to sell rather than to inform. Peak power figures, inflated channel counts, and efficiency claims with no test conditions attached make cross-brand comparison genuinely hard. Three things actually decide the buy.\u003c\/p\u003e\n\n\u003ch3\u003eRMS Power\u003c\/h3\u003e\n\n\u003cp\u003eIgnore peak. It is a marketing number with no relationship to what the amp does in your car. RMS is what it delivers continuously without distorting or going into thermal shutdown, and RMS is what you match to the speaker's rating.\u003c\/p\u003e\n\n\u003cp\u003eThe 4-channel amps here run 50W to 150W RMS per channel at 4 ohms. Most aftermarket component sets are rated 75W to 150W RMS, so that range covers the majority of front stages. Underpowering is what kills speakers, because an amp pushed into clipping hands the voice coil a distorted signal it cannot dissipate. Overpowering with the gain set properly is fine. Match the numbers; don't chase the biggest one on the box. See what you are driving in \u003ca href=\"\/collections\/component-sets\"\u003ecomponent sets\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003e4-Channel, or 2-Channel Plus a Monoblock\u003c\/h3\u003e\n\n\u003cp\u003eThis is the real decision. One chassis can run a front stage and a bridged sub. Two chassis do each job properly. Neither is wrong; they cost different things.\u003c\/p\u003e\n\n\u003ctable class=\"ai-compare\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e \u003c\/th\u003e\n\u003cth\u003eOne 4-Channel\u003c\/th\u003e\n\u003cth\u003e2-Channel Plus Monoblock\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eChassis in the build\u003c\/td\u003e\n\u003ctd data-label=\"One 4-Channel\"\u003e1\u003c\/td\u003e\n\u003ctd data-label=\"2-Channel Plus Monoblock\"\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWhat the front stage gets\u003c\/td\u003e\n\u003ctd data-label=\"One 4-Channel\"\u003e2 channels, sharing the supply with the sub or rear\u003c\/td\u003e\n\u003ctd data-label=\"2-Channel Plus Monoblock\"\u003eIts own amp, supply and ground\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubwoofer\u003c\/td\u003e\n\u003ctd data-label=\"One 4-Channel\"\u003eA bridged pair, 4 ohm typical\u003c\/td\u003e\n\u003ctd data-label=\"2-Channel Plus Monoblock\"\u003eA monoblock rated to 1 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear fill\u003c\/td\u003e\n\u003ctd data-label=\"One 4-Channel\"\u003eOnly if you skip the sub\u003c\/td\u003e\n\u003ctd data-label=\"2-Channel Plus Monoblock\"\u003eNeeds a third amp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd data-label=\"One 4-Channel\"\u003eOne set of crossovers across all four channels\u003c\/td\u003e\n\u003ctd data-label=\"2-Channel Plus Monoblock\"\u003eIndependent per amp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePick it when\u003c\/td\u003e\n\u003ctd data-label=\"One 4-Channel\"\u003eSpace, budget or a single-chassis install decides it\u003c\/td\u003e\n\u003ctd data-label=\"2-Channel Plus Monoblock\"\u003eThe front stage and the sub each deserve their own amp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eIf you are splitting the job, see \u003ca href=\"\/collections\/2-channel-amplifiers\"\u003e2-channel amps\u003c\/a\u003e and \u003ca href=\"\/collections\/monoblock-amplifier\"\u003emonoblocks\u003c\/a\u003e. If you are running an active three-way, you need more channels than this page has: go to \u003ca href=\"\/collections\/5-6-8-channel-amplifiers\"\u003e6-channel\u003c\/a\u003e, or browse the \u003ca href=\"\/collections\/car-amplifiers\"\u003efull amplifier lineup\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eBridging\u003c\/h3\u003e\n\n\u003cp\u003eNearly every 4-channel here bridges. The usual layout is the front pair in stereo and the rear pair bridged to mono for a subwoofer, which gets you a whole system out of one chassis.\u003c\/p\u003e\n\n\u003caside class=\"ai-callout-spec\"\u003e\n\u003cp class=\"ai-callout-label\"\u003eBridging Math\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"ai-spec-key\"\u003eBridging halves the load each channel sees.\u003c\/span\u003e An amp stable at 2 ohms per channel is stable at \u003cspan class=\"ai-spec-key\"\u003e4 ohms bridged\u003c\/span\u003e, not 2. Most subs are wired to 2 ohms to pull maximum power from a monoblock, and that load is not available to you here. \u003cspan class=\"ai-spec-key\"\u003eCheck the bridged minimum impedance\u003c\/span\u003e and wire the sub to suit it.\u003c\/p\u003e\n\u003c\/aside\u003e\n\n\u003ch3\u003eClass Topology\u003c\/h3\u003e\n\n\u003cp\u003eOn a subwoofer, Class D is settled: a sub reproduces a narrow band where the differences between topologies are hard to hear. A 4-channel amp is running full range, from 80Hz up through the midrange and treble where the ear is most sensitive, so the choice matters more here than it does on a monoblock.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eClass D.\u003c\/strong\u003e Efficient, cool, small, and easy on the alternator. Prodigy NBM100.4 and NB300.4, Wavtech link300.4mini and link500.4mini, Image Dynamics SQ800.4. Modern Class D at this level is transparent full range and the practical answer for most builds. Full range in \u003ca href=\"\/collections\/class-d-amplifiers\"\u003eClass D amplifiers\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eClass AB.\u003c\/strong\u003e Less efficient, hotter, bigger, and the bias current eliminates crossover distortion outright. US Acoustics Lisa and Barbara Ann, the whole Crescendo Revolution 4-channel line, Tru Technology Tungsten and Tungsten Grande. This is where the SQ builds land. Full range in \u003ca href=\"\/collections\/class-ab-amplifiers\"\u003eClass AB amplifiers\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eBrands in This Collection\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eUS Acoustics.\u003c\/strong\u003e Lisa at 4 x 50W ($159.99) and Barbara Ann at 4 x 100W ($399.99). Class AB at the accessible end, and the right starting point for a factory-replacement front stage that still has to sound like something. See the \u003ca href=\"\/collections\/us-acoustics-amplifiers\"\u003efull US Acoustics lineup\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eProdigy Audio.\u003c\/strong\u003e NBM100.4 at 600W ($225.99) and NB300.4 at 1200W ($416.99). Class D, and the strongest power-per-dollar on the page. See \u003ca href=\"\/collections\/prodigy-amplifiers\"\u003eProdigy amplifiers\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWavtech.\u003c\/strong\u003e link300.4mini ($329.99) and link500.4mini ($449.99). Compact-chassis Class D for builds where the amp has to fit somewhere it really does not want to. See \u003ca href=\"\/collections\/wavtech\"\u003eWavtech\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImage Dynamics.\u003c\/strong\u003e SQ800.4, 800W full-range Class D ($469.99). Tuned around the brand's own driver lineup, which is why we reach for it on an Image Dynamics front stage. See \u003ca href=\"\/collections\/image-dynamics-amplifiers\"\u003eImage Dynamics amplifiers\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCrescendo.\u003c\/strong\u003e Revolution 3A4 ($499.00), 5A4 ($779.99), and 7A4 ($1,699.99). All three are Class AB, which is the point of the line: bias-current refinement at prices where most of the market has moved to Class D. The 7A4 is the SQ pick. See \u003ca href=\"\/collections\/crescendo-amplifiers\"\u003eCrescendo amplifiers\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eTru Technology.\u003c\/strong\u003e Tungsten 4 Channel ($1,399.99) and Tungsten Grande Class AB 4 Channel ($2,399.99). US-built Class AB with nothing cut on the output stage. The reference tier here. See \u003ca href=\"\/collections\/tru-technology\"\u003eTru Technology\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eA 4-channel is the middle of the system, not the end of it. The drivers are in \u003ca href=\"\/collections\/component-sets\"\u003ecomponent sets\u003c\/a\u003e, the bass is in \u003ca href=\"\/collections\/car-subwoofers\"\u003ecar subwoofers\u003c\/a\u003e, and if you are going active the \u003ca href=\"\/collections\/digital-sound-processor\"\u003eDSP lineup\u003c\/a\u003e does the crossover work these amps otherwise have to guess at. Setting gain correctly protects all of it: \u003ca href=\"\/blogs\/car-amplifiers\/how-to-set-amplifier-gain-a-practical-step-by-step-guide\"\u003ehow we set amplifier gain\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003caside class=\"ai-callout-cta\"\u003e\n\u003cp class=\"ai-callout-label\"\u003eNeed Help Choosing a 4-Channel Amplifier?\u003c\/p\u003e\n\u003cp\u003eSend us your speaker specs (RMS power, impedance) and how you are laying the system out (front and rear, front plus a bridged sub, or active bi-amp). We will tell you which 4-channel fits and at what impedance to wire it, before you buy. \u003ca href=\"\/pages\/contact-us\"\u003eContact us\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"ai-contact-phone\"\u003e707-999-3071\u003c\/span\u003e\u003cspan class=\"ai-contact-divider\"\u003e|\u003c\/span\u003e\u003cspan class=\"ai-contact-email\"\u003econtact@audiointensity.com\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/aside\u003e\n\n\u003cdiv class=\"ai-faq-section\"\u003e\n\n\u003ch2\u003eFrequently Asked 4-Channel Amplifier Questions\u003c\/h2\u003e\n\n\u003ch3\u003eWhat is a 4-channel amplifier used for?\u003c\/h3\u003e\n\u003cp\u003eThe two common layouts are front plus rear (a stereo pair each), or 3-channel mode, which is a front stereo pair plus the rear channels bridged to drive a subwoofer. Some builds run a 4-channel in active bi-amp with a DSP, one pair on tweeters and one on midrange. That flexibility is why the 4-channel is the most common single-amp upgrade in car audio.\u003c\/p\u003e\n\n\u003ch3\u003eCan I bridge a 4-channel amp for a subwoofer?\u003c\/h3\u003e\n\u003cp\u003eYes, almost all of them bridge. The usual setup is the front two channels in stereo for the speakers and the rear two bridged to mono for the sub, which gets you a full system from one chassis. Bridging halves the load each channel sees, so an amp stable at 2 ohms per channel is stable at 4 ohms bridged. Confirm the bridged minimum impedance and wire the subwoofer to match it.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is the difference between Class D and Class AB?\u003c\/h3\u003e\n\u003cp\u003eClass D is the most efficient, generating less heat and drawing less current, which suits compact installs and high-power builds. Class AB runs less efficiently and hotter, but its bias current eliminates crossover distortion outright. Because a 4-channel amp is running full range rather than just bass, that difference is more audible here than on a subwoofer amp. Most SQ-focused builds land on Class AB. Modern Class D from a good manufacturer is transparent full range and is the practical choice for most daily drivers.\u003c\/p\u003e\n\n\u003ch3\u003eHow much power do I need per channel?\u003c\/h3\u003e\n\u003cp\u003eMatch the amplifier's RMS per channel to your speakers' RMS rating, ideally 75% to 150% of it. Components rated 75W to 100W RMS are well matched by 75 to 100 watts per channel. Higher-power components want 100 to 150 watts per channel. Underpowering causes clipping at volume, and clipping is what damages speakers.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I set the crossover on a 4-channel amp?\u003c\/h3\u003e\n\u003cp\u003eOn the channels driving speakers, engage the high-pass filter at around 80 Hz so deep bass never reaches them. On bridged channels driving a subwoofer, engage the low-pass filter at around 80 Hz so it only sees bass. Setting both to the same point creates a clean handoff. If a DSP is doing the crossover work, set the amplifier's filters to off or full range and let the processor handle it.\u003c\/p\u003e\n\n\u003ch3\u003eAre these new with manufacturer warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Every amplifier in this collection is brand new, sold by an authorized dealer, and carries the full manufacturer warranty. We handle warranty claims directly with the brand. Demo and previous-display units are labeled as such on the product page.\u003c\/p\u003e\n\n\u003ch3\u003eDo you offer power-matching consultation before purchase?\u003c\/h3\u003e\n\u003cp\u003eYes. Send us your speaker specs (RMS power, impedance) and your layout (front and rear, front plus bridged sub, or active bi-amp) and we will recommend the right 4-channel for the build. Pre-purchase consultation is free. We would rather spend 15 minutes confirming the match than have you return a mismatched amplifier.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\n\u003c\/div\u003e","products":[{"product_id":"image-dynamics-sq800-4-800w-4ch-full-range-digital-amplifier","title":"Image Dynamics SQ800.4 800W 4ch. Full Range Digital Amplifier","description":"\u003cdiv class=\"features\"\u003e\n\u003cul\u003e\n\u003cli\u003eInternational Rectifier® Chip Set\u003c\/li\u003e\n\u003cli\u003eUltra Low Current Draw High Damping Control Circuit \u003c\/li\u003e\n\u003cli\u003eHigh Efficiency SMD Circuit Technology \u003c\/li\u003e\n\u003cli\u003eDouble Sided Copper Plated PCB \u003c\/li\u003e\n\u003cli\u003eDigital Sound Optimization Circuitry \u003c\/li\u003e\n\u003cli\u003eQuiet Switching \u003c\/li\u003e\n\u003cli\u003eHigh Current Voltage Ripple Rejection Circuitry \u003c\/li\u003e\n\u003cli\u003eVirtual Silence Turn On\/Off Mute Circuit \u003c\/li\u003e\n\u003cli\u003eTemperature Controlled Output Current Limiting Protection \u003c\/li\u003e\n\u003cli\u003eWired Remote Level Control \u003c\/li\u003e\n\u003cli\u003eBalanced RCA Input Connectors \u003c\/li\u003e\n\u003cli\u003e40 Click Bass Freq Control \u003c\/li\u003e\n\u003cli\u003e40 Click Sub-Sonic Filter Control \u003c\/li\u003e\n\u003cli\u003e40 Click LPF Control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eSQ800.4 800W 4ch. Full Range Digital Amplifier \u003c\/h2\u003e\n\u003ch4\u003e200W RMS x 4 @ 2Ω \/ 100W RMS x 4 @ 4Ω \/ 400W x 2 @ 4Ω\u003c\/h4\u003e\n\u003cp class=\"font_8\"\u003e \u003c\/p\u003e\n\u003cp\u003eIR Full Range Digital SQ Series Amplifiers feature the latest International Rectifier® (IR) circuitry, delivering more power without rollback. They provide more power on demand in a compact design without sacrificing the precise sound quality and reliability demands of the most discerning audiophile. \u003c\/p\u003e\n\u003cp\u003eIR®, a leader in PWM circuit design, has worked with Image Dynamics engineers to produce the most stable power output possible with minimal RF interference and improved sound quality. From the precision clicks of the rotary settings to the sleek lines of the heat sync, the SQ Series amplifiers are the perfect match to power your Image Dynamics sound stage.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul class=\"list-unstyled\"\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eSelectable Subwoofer EQ:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e0 \/ 9dB \/ 18dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eInputs:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eRCA\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eHeight:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eWidth:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e7.25\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eDepth:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e10.5\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003e4-ohm Mono Power:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e400W x 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003e4-ohm Power:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e100W\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003e2-ohm Power:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e200W\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eSubwoofer EQ Frequency:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e45Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eLow-Pass Crossover Freq:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e30Hz-300Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eHigh-Pass Crossover Freq:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e50Hz-300Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003ePeak Power:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e800W\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eCrossover Slope:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e12dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eDimensions (in Inches):\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e10.5\"x7.25\"x2.0\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eInput Sensitivity:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e250mv - 10.0V RMS\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eS\/N Ratio:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u0026gt;95dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eTotal Harmonic Distortion:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e0.1%\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eOutput Power (14.4 V) @ 4 ohm:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e400W\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eOutput Power (14.4 V) @ 2 ohm:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e200W\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eChannels (mono):\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e4\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"spec-label\"\u003eFrequency Response:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e10Hz-30kHz\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv data-widget=\"364915\" data-quivers=\"true\" loading=\"false\" id=\"qWidget-364915\" data-force-retranslate=\"\" quivers-view=\"true\" quivers-bootstrap=\"true\"\u003e\n\u003cdiv class=\"view widget row\"\u003e\n\u003cdiv class=\"view-overlay\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"view-body qProductsView translate\" id=\"qWidgetView\"\u003e\n\u003cdiv class=\"qProductsUI qWidget qSection row\"\u003e\n\u003cdiv class=\"col-xs-12\"\u003e\n\u003cdiv id=\"qProduct\" class=\"qProductDetails qProductShort row\" data-quiversproduct=\"364915\" data-ga=\"\" data-iswidget=\"true\"\u003e\n\u003cdiv class=\"qProductOverview col-xs-12\"\u003e\n\u003cdiv id=\"qVariantDetails\" class=\"qVariant col-xs-12\"\u003e\n\u003cdiv class=\"qVariantDetails row\"\u003e\n\u003cdiv class=\"qVariantInfo\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!----\u003e","brand":"Image Dynamics","offers":[{"title":"Default Title","offer_id":41765188141145,"sku":"SQ800.4","price":469.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/image-dynamics-sq8004-800w-4ch-full-range-digital-amplifieramplifierimage-dynamics-808978.jpg?v=1761970868"},{"product_id":"wavtech-link300-4mini-compact-4-channel-amplifier","title":"WavTech link300.4mini: Compact 4-Channel Amplifier","description":"\u003cdiv class=\"pls-desc\"\u003e\n\u003cstyle\u003e\n  .pls-desc {\n    --pls-dark: #0a1730;\n    --pls-deep: #122a5c;\n    --pls-blue: #1c3f8f;\n    --pls-accent: #2f6fe0;\n    --pls-tint: #eef3fb;\n    --pls-line: #d6e1f2;\n    --pls-text: #1a2233;\n    --pls-muted: #4a5568;\n    max-width: 1200px;\n    margin: 0 auto;\n    font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\n    color: var(--pls-text);\n    line-height: 1.6;\n  }\n  .pls-desc * { box-sizing: border-box; }\n  .pls-hero {\n    background: 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var(--pls-deep);\n    font-weight: 700;\n  }\n  .pls-card-divider {\n    width: 42px;\n    height: 3px;\n    background: var(--pls-accent);\n    border-radius: 2px;\n    margin: 0 0 14px;\n  }\n  .pls-card p { font-size: 15.5px; color: var(--pls-muted); margin: 0; }\n  .pls-power {\n    display: grid;\n    grid-template-columns: repeat(3, 1fr);\n    gap: 16px;\n    margin-top: 22px;\n  }\n  @media (max-width: 720px) { .pls-power { grid-template-columns: 1fr; } }\n  .pls-power-cell {\n    background: linear-gradient(160deg, var(--pls-deep), var(--pls-blue));\n    color: #fff;\n    border-radius: 12px;\n    padding: 24px 20px;\n    text-align: center;\n  }\n  .pls-power-cell .num {\n    display: block;\n    font-size: 30px;\n    font-weight: 800;\n    line-height: 1.1;\n  }\n  .pls-power-cell .unit {\n    display: block;\n    font-size: 13px;\n    letter-spacing: 1px;\n    text-transform: uppercase;\n    color: #b9d0f7;\n    margin-top: 8px;\n  }\n  .pls-cta {\n    background: linear-gradient(135deg, var(--pls-blue) 0%, var(--pls-deep) 50%, var(--pls-dark) 100%);\n    color: #fff;\n    padding: 44px;\n    border-radius: 14px;\n    text-align: center;\n    margin-top: 26px;\n  }\n  .pls-cta h3 { color: #fff; font-size: 24px; margin: 0 0 12px; font-weight: 800; }\n  .pls-cta p { color: #d4e1f7; font-size: 16.5px; margin: 0 auto; max-width: 680px; }\n\u003c\/style\u003e\n\n  \u003cdiv class=\"pls-hero\"\u003e\n    \u003cspan class=\"pls-eyebrow\"\u003eWavtech Mini Series\u003c\/span\u003e\n    \u003ch2\u003elink300.4mini | 300 Watt 4-Channel Amplifier\u003c\/h2\u003e\n    \u003cp\u003eA true 4-channel amplifier in a footprint barely larger than a deck of cards. Bridgeable, fully integrated, and built to run a complete front stage and a subwoofer from one tiny chassis.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pls-section\"\u003e\n    \u003ch3\u003eReal Power in a Tiny Footprint\u003c\/h3\u003e\n    \u003cp\u003eThe link300.4mini measures just 6.4 by 4.5 by 1.65 inches, small enough to hide under a seat or behind a panel where a conventional amplifier will not go. What sets it apart from other compact amplifiers is that it does not give up capability to get there. It produces 50 watts RMS per channel at 4 ohms and 75 watts RMS per channel at 2 ohms, and it is fully bridgeable to 150 watts RMS x 2 at 4 ohms.\u003c\/p\u003e\n    \u003cp\u003eBridgeability is the feature most small amplifiers drop. Here it stays, which means a single chassis can run a set of components up front and a subwoofer at the same time.\u003c\/p\u003e\n    \u003cdiv class=\"pls-power\"\u003e\n      \u003cdiv class=\"pls-power-cell\"\u003e\n\u003cspan class=\"num\"\u003e50W x 4\u003c\/span\u003e\u003cspan class=\"unit\"\u003eRMS at 4 Ohms\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"pls-power-cell\"\u003e\n\u003cspan class=\"num\"\u003e75W x 4\u003c\/span\u003e\u003cspan class=\"unit\"\u003eRMS at 2 Ohms\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"pls-power-cell\"\u003e\n\u003cspan class=\"num\"\u003e150W x 2\u003c\/span\u003e\u003cspan class=\"unit\"\u003eRMS at 4 Ohms BTL\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pls-section tint\"\u003e\n    \u003ch3\u003eBuilt-In Summing for Factory Systems\u003c\/h3\u003e\n    \u003cp\u003eModern factory systems often split the audio across multiple speakers, sending bass to one set and midrange or treble to another instead of a single full-range signal. The link300.4mini handles that internally with built-in summing, recombining those split signals into a usable full-range feed with no outboard processor required. A level trim adjustment then fine-tunes the output of each channel pair after summing.\u003c\/p\u003e\n    \u003cp\u003eThis is paired with Wavtech's best-in-class line output converter, built-in loading, and the ability to accept up to 40V of hi-level input, so the amplifier ties directly into demanding factory wiring.\u003c\/p\u003e\n    \u003cdiv class=\"pls-highlight\"\u003e\n      \u003cp\u003eA common setup: run channels 1 and 2 in stereo with the high-pass filter for a component front stage, then bridge channels 3 and 4 with the low-pass filter for a subwoofer. That delivers 50W x 2 for the components and 150W x 1 for the sub from one amplifier.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pls-section\"\u003e\n    \u003ch3\u003eClean Integration, Easy Setup\u003c\/h3\u003e\n    \u003cp\u003eThe link300.4mini is engineered to drop into modern vehicles cleanly. Adaptive OEM Load Technology keeps factory radios from throwing error messages, differential balanced inputs reject system noise, and auto turn-on works through DC-offset or audio signal detection so no remote wire is required when one is not available. It is Start\/Stop system compatible, holding performance steady when the engine cuts at idle.\u003c\/p\u003e\n    \u003cp\u003eVariable high-pass and low-pass crossovers at 12dB per octave let you filter each channel pair, and variable gain with a clip LED makes level matching straightforward. The compact aluminum chassis uses detachable mounting tabs and 4-gauge power and ground terminals, with Active Thermal Management keeping it composed under load.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pls-grid\"\u003e\n    \u003cdiv class=\"pls-card\"\u003e\n      \u003cspan class=\"pls-card-label\"\u003eFootprint\u003c\/span\u003e\n      \u003ch4\u003e6.4 x 4.5 x 1.65 Inches\u003c\/h4\u003e\n      \u003cdiv class=\"pls-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eOne of the smallest true 4-channel amplifiers available, built to mount where conventional amps cannot fit.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pls-card\"\u003e\n      \u003cspan class=\"pls-card-label\"\u003eFlexibility\u003c\/span\u003e\n      \u003ch4\u003eFully Bridgeable\u003c\/h4\u003e\n      \u003cdiv class=\"pls-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eBridges to 150 watts x 2 at 4 ohms, so one chassis runs a component front stage and a subwoofer together.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pls-card\"\u003e\n      \u003cspan class=\"pls-card-label\"\u003eSignal\u003c\/span\u003e\n      \u003ch4\u003eBuilt-In Summing\u003c\/h4\u003e\n      \u003cdiv class=\"pls-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eRecombines split factory signals into a full-range feed internally, with level trim on each channel pair. No outboard processor needed.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pls-card\"\u003e\n      \u003cspan class=\"pls-card-label\"\u003eIntegration\u003c\/span\u003e\n      \u003ch4\u003e40V Input + Adaptive OEM Load\u003c\/h4\u003e\n      \u003cdiv class=\"pls-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eBest-in-class LOC accepts high-level signal from factory systems and prevents radio error messages.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pls-card\"\u003e\n      \u003cspan class=\"pls-card-label\"\u003eTuning\u003c\/span\u003e\n      \u003ch4\u003eVariable HP\/LP Crossover\u003c\/h4\u003e\n      \u003cdiv class=\"pls-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003e12dB per octave high-pass and low-pass filtering on each channel pair to separate speakers from a subwoofer cleanly.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pls-card\"\u003e\n      \u003cspan class=\"pls-card-label\"\u003eReliability\u003c\/span\u003e\n      \u003ch4\u003eActive Thermal Management\u003c\/h4\u003e\n      \u003cdiv class=\"pls-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eHolds rated output under sustained load inside a compact aluminum chassis with locking hi-level terminals.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pls-cta\"\u003e\n    \u003ch3\u003eThe Compact Amp That Does It All\u003c\/h3\u003e\n    \u003cp\u003ePower, bridging, summing, and factory integration in a chassis just 6.4 inches wide. The link300.4mini upgrades a factory system without taking up the space a full-size amplifier demands.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Wavtech","offers":[{"title":"Default Title","offer_id":42327134142553,"sku":"link300.4mini","price":329.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/wavtech-link3004mini-compact-4-channel-amplifieramplifierwavtech-782393.png?v=1780508316"},{"product_id":"crescendo-revolution-7a4-4-channel-amplifier","title":"Crescendo REVOLUTION 7A4 4 Channel Amplifier","description":"\u003cdiv class=\"cr-desc\"\u003e\n\u003cstyle\u003e\n  .cr-desc {\n    --cr-black: #0d0d0f;\n    --cr-charcoal: #1c1c21;\n    --cr-slate: #2a2a31;\n    --cr-orange: #f97316;\n    --cr-orange-deep: #c2410c;\n    --cr-tint: #faf6f1;\n    --cr-line: #ece4da;\n    --cr-text: #1f1f23;\n    --cr-muted: #55555e;\n    max-width: 1200px;\n    margin: 0 auto;\n    font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\n    color: var(--cr-text);\n    line-height: 1.6;\n  }\n  .cr-desc * { box-sizing: border-box; }\n  .cr-hero {\n    background: linear-gradient(135deg, var(--cr-black) 0%, var(--cr-charcoal) 60%, var(--cr-slate) 100%);\n    color: #fff;\n    padding: 56px 44px;\n    border-radius: 14px;\n    text-align: center;\n    border-bottom: 4px solid var(--cr-orange);\n  }\n  .cr-hero .cr-eyebrow {\n    display: inline-block;\n    font-size: 13px;\n    letter-spacing: 2.5px;\n    text-transform: uppercase;\n    color: var(--cr-orange);\n    font-weight: 700;\n    margin-bottom: 16px;\n  }\n  .cr-hero h2 {\n    font-size: 34px;\n    line-height: 1.2;\n    margin: 0 0 14px;\n    color: #fff;\n    font-weight: 800;\n  }\n  .cr-hero p {\n    font-size: 18px;\n    color: #d8d8de;\n    max-width: 760px;\n    margin: 0 auto;\n  }\n  .cr-section {\n    background: #ffffff;\n    padding: 40px 44px;\n    margin-top: 26px;\n    border-radius: 14px;\n    border: 1px solid var(--cr-line);\n  }\n  .cr-section.tint { background: var(--cr-tint); }\n  .cr-section h3 {\n    font-size: 25px;\n    margin: 0 0 18px;\n    color: var(--cr-black);\n    font-weight: 800;\n  }\n  .cr-section p {\n    font-size: 16.5px;\n    color: var(--cr-text);\n    margin: 0 0 16px;\n  }\n  .cr-section p:last-child { margin-bottom: 0; }\n  .cr-highlight {\n    border-left: 4px solid var(--cr-orange);\n    background: #fff7ef;\n    padding: 20px 24px;\n    border-radius: 0 10px 10px 0;\n    margin: 22px 0 0;\n  }\n  .cr-highlight p { margin: 0; font-size: 16px; }\n  .cr-grid {\n    display: grid;\n    grid-template-columns: 1fr 1fr;\n    gap: 20px;\n    margin-top: 24px;\n  }\n  @media (max-width: 720px) { .cr-grid { grid-template-columns: 1fr; } }\n  .cr-card {\n    background: #ffffff;\n    border: 1px solid var(--cr-line);\n    border-radius: 12px;\n    padding: 26px;\n  }\n  .cr-card-label {\n    display: inline-block;\n    font-size: 11.5px;\n    letter-spacing: 1.5px;\n    text-transform: uppercase;\n    color: var(--cr-orange-deep);\n    font-weight: 700;\n    margin-bottom: 10px;\n  }\n  .cr-card h4 {\n    font-size: 18.5px;\n    margin: 0 0 12px;\n    color: var(--cr-black);\n    font-weight: 700;\n  }\n  .cr-card-divider {\n    width: 42px;\n    height: 3px;\n    background: var(--cr-orange);\n    border-radius: 2px;\n    margin: 0 0 14px;\n  }\n  .cr-card p { font-size: 15.5px; color: var(--cr-muted); margin: 0; }\n  .cr-power {\n    display: grid;\n    grid-template-columns: repeat(3, 1fr);\n    gap: 16px;\n    margin-top: 22px;\n  }\n  @media (max-width: 720px) { .cr-power { grid-template-columns: 1fr; } }\n  .cr-power-cell {\n    background: linear-gradient(160deg, var(--cr-charcoal), var(--cr-black));\n    color: #fff;\n    border-radius: 12px;\n    padding: 24px 20px;\n    text-align: center;\n    border-top: 3px solid var(--cr-orange);\n  }\n  .cr-power-cell .num {\n    display: block;\n    font-size: 30px;\n    font-weight: 800;\n    line-height: 1.1;\n  }\n  .cr-power-cell .unit {\n    display: block;\n    font-size: 13px;\n    letter-spacing: 1px;\n    text-transform: uppercase;\n    color: var(--cr-orange);\n    margin-top: 8px;\n  }\n  .cr-cta {\n    background: linear-gradient(135deg, var(--cr-slate) 0%, var(--cr-charcoal) 50%, var(--cr-black) 100%);\n    color: #fff;\n    padding: 44px;\n    border-radius: 14px;\n    text-align: center;\n    margin-top: 26px;\n    border-top: 4px solid var(--cr-orange);\n  }\n  .cr-cta h3 { color: #fff; font-size: 24px; margin: 0 0 12px; font-weight: 800; }\n  .cr-cta p { color: #d8d8de; font-size: 16.5px; margin: 0 auto; max-width: 680px; }\n\u003c\/style\u003e\n\n  \u003cdiv class=\"cr-hero\"\u003e\n    \u003cspan class=\"cr-eyebrow\"\u003eCrescendo Revolution Series Flagship\u003c\/span\u003e\n    \u003ch2\u003eRevolution 7A4 | 4-Channel Reference Amplifier\u003c\/h2\u003e\n    \u003cp\u003ePure amplification, zero coloration. The flagship Revolution 7A4 pairs Class AB High Bias power with an audio-grade signal path built on Burr Brown chips and Elna capacitors, for sound that is neutral, controlled, and refined at every level.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"cr-section\"\u003e\n    \u003ch3\u003eFlagship Power With Reference Manners\u003c\/h3\u003e\n    \u003cp\u003eThe Revolution 7A4 delivers 150 watts per channel at 4 ohms, 240 watts per channel at 2 ohms, and 480 watts per channel bridged at 4 ohms, all rated at 14.4 volts with a 2-ohm minimum load. That is serious authority for an audiophile amplifier: enough to run a full high-end active front stage, or to bridge into a pair of demanding midbass drivers without strain.\u003c\/p\u003e\n    \u003cp\u003eThe measurements are where the flagship earns its place. Total harmonic distortion is 0.0035% at 1 watt across the audible band, signal-to-noise reaches 110 dBA at rated power (97 dBA by the CEA-2006 1-watt standard), and frequency response spans 5 Hz to 100 kHz measured at -0.5 dB, a far stricter window than the -3 dB figure most amplifiers quote.\u003c\/p\u003e\n    \u003cdiv class=\"cr-power\"\u003e\n      \u003cdiv class=\"cr-power-cell\"\u003e\n\u003cspan class=\"num\"\u003e150W x 4\u003c\/span\u003e\u003cspan class=\"unit\"\u003eRMS at 4 Ohms\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"cr-power-cell\"\u003e\n\u003cspan class=\"num\"\u003e240W x 4\u003c\/span\u003e\u003cspan class=\"unit\"\u003eRMS at 2 Ohms\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"cr-power-cell\"\u003e\n\u003cspan class=\"num\"\u003e480W x 2\u003c\/span\u003e\u003cspan class=\"unit\"\u003eBridged at 4 Ohms\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"cr-section tint\"\u003e\n    \u003ch3\u003eAn Audio-Grade Signal Path\u003c\/h3\u003e\n    \u003cp\u003eCrescendo built the 7A4's signal path from components chosen for transparency. Burr Brown chips handle the preamp stage and Elna audio-grade capacitors sit in the signal path, a combination found in high-end home audio far more often than in a car amplifier. The dual symmetrical power supply eliminates noise and provides the dynamic headroom that keeps complex passages composed, and all four channels are individually calibrated for matched, accurate output across the soundstage.\u003c\/p\u003e\n    \u003cp\u003eFor the purist, the 7A4 includes a preamplifier bypass option that routes the signal past the input gain stage entirely. Feed it a properly leveled signal from a high-output processor and the path from RCA to output stage gets even shorter.\u003c\/p\u003e\n    \u003cdiv class=\"cr-highlight\"\u003e\n      \u003cp\u003eLike every Revolution amplifier, the 7A4 carries no onboard filter. Crossover, time alignment, and EQ belong in your DSP; the 7A4's job is to amplify the result without editorializing. Paired with a Goldhorn processor, this is a reference-grade signal chain.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"cr-section\"\u003e\n    \u003ch3\u003eBuilt Like the Flagship It Is\u003c\/h3\u003e\n    \u003cp\u003eThe 7A4 measures 360 by 215 by 54 millimeters (14.2 by 8.5 by 2.1 inches) and weighs a substantial 4.5 kilograms (9.9 pounds), most of it heatsink and power supply. The black and silver chassis keeps a low 2.1-inch profile for clean rack integration, onboard fusing is 2 x 50 amps, and protection covers thermal and short circuit conditions. Working voltage spans 10 to 16 volts, and input sensitivity adjusts from 900 mV to 5 V into a 10 kilohm input impedance.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"cr-grid\"\u003e\n    \u003cdiv class=\"cr-card\"\u003e\n      \u003cspan class=\"cr-card-label\"\u003eTopology\u003c\/span\u003e\n      \u003ch4\u003eClass AB High Bias\u003c\/h4\u003e\n      \u003cdiv class=\"cr-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eOutput stage biased toward Class A operation for linearity and detail at every listening level, with flagship power behind it.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"cr-card\"\u003e\n      \u003cspan class=\"cr-card-label\"\u003eComponents\u003c\/span\u003e\n      \u003ch4\u003eBurr Brown + Elna\u003c\/h4\u003e\n      \u003cdiv class=\"cr-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eAudio-grade preamp chips and capacitors selected for transparency, in a signal path built like high-end home audio.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"cr-card\"\u003e\n      \u003cspan class=\"cr-card-label\"\u003ePower Supply\u003c\/span\u003e\n      \u003ch4\u003eDual Symmetrical Design\u003c\/h4\u003e\n      \u003cdiv class=\"cr-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eEliminates noise and delivers the dynamic headroom that keeps demanding passages composed at volume.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"cr-card\"\u003e\n      \u003cspan class=\"cr-card-label\"\u003ePrecision\u003c\/span\u003e\n      \u003ch4\u003eIndividually Balanced Channels\u003c\/h4\u003e\n      \u003cdiv class=\"cr-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eAll four channels are individually calibrated for matched output, so the soundstage stays accurate left to right.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"cr-card\"\u003e\n      \u003cspan class=\"cr-card-label\"\u003ePurist Path\u003c\/span\u003e\n      \u003ch4\u003ePreamplifier Bypass\u003c\/h4\u003e\n      \u003cdiv class=\"cr-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eRoute past the input gain stage entirely when feeding a high-output processor, shortening the signal path further.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"cr-card\"\u003e\n      \u003cspan class=\"cr-card-label\"\u003eMeasurements\u003c\/span\u003e\n      \u003ch4\u003e0.0035% THD, -0.5dB Bandwidth\u003c\/h4\u003e\n      \u003cdiv class=\"cr-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003e5 Hz to 100 kHz at a strict -0.5 dB window with 110 dBA signal-to-noise. Reference numbers, not marketing numbers.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"cr-cta\"\u003e\n    \u003ch3\u003eThe Reference Front Stage Starts Here\u003c\/h3\u003e\n    \u003cp\u003eThe Revolution 7A4 is the amplifier for systems where the goal is the truth of the recording: flagship power, an audio-grade signal path, and measurements that read like home audio. Pure amplification, zero coloration.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Crescendo","offers":[{"title":"Default Title","offer_id":42442883891289,"sku":"REVOLUTION 7A4","price":1699.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/crescendo-revolution-7a4-4-channel-amplifieramplifiercrescendo-1358271.webp?v=1772499912"},{"product_id":"crescendo-revolution-5a4-4-channel-amplifier","title":"Crescendo REVOLUTION 5A4 4 channel Amplifier","description":"\u003cdiv class=\"cr-desc\"\u003e\n\u003cstyle\u003e\n  .cr-desc {\n    --cr-black: #0d0d0f;\n    --cr-charcoal: #1c1c21;\n    --cr-slate: #2a2a31;\n    --cr-orange: #f97316;\n    --cr-orange-deep: #c2410c;\n    --cr-tint: #faf6f1;\n    --cr-line: #ece4da;\n    --cr-text: #1f1f23;\n    --cr-muted: #55555e;\n    max-width: 1200px;\n    margin: 0 auto;\n    font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\n    color: var(--cr-text);\n    line-height: 1.6;\n  }\n  .cr-desc * { box-sizing: border-box; }\n  .cr-hero {\n    background: linear-gradient(135deg, var(--cr-black) 0%, var(--cr-charcoal) 60%, var(--cr-slate) 100%);\n    color: #fff;\n    padding: 56px 44px;\n    border-radius: 14px;\n    text-align: center;\n    border-bottom: 4px solid var(--cr-orange);\n  }\n  .cr-hero .cr-eyebrow {\n    display: inline-block;\n    font-size: 13px;\n    letter-spacing: 2.5px;\n    text-transform: uppercase;\n    color: var(--cr-orange);\n    font-weight: 700;\n    margin-bottom: 16px;\n  }\n  .cr-hero h2 {\n    font-size: 34px;\n    line-height: 1.2;\n    margin: 0 0 14px;\n    color: #fff;\n    font-weight: 800;\n  }\n  .cr-hero p {\n    font-size: 18px;\n    color: #d8d8de;\n    max-width: 760px;\n    margin: 0 auto;\n  }\n  .cr-section {\n    background: #ffffff;\n    padding: 40px 44px;\n    margin-top: 26px;\n    border-radius: 14px;\n    border: 1px solid var(--cr-line);\n  }\n  .cr-section.tint { background: var(--cr-tint); }\n  .cr-section h3 {\n    font-size: 25px;\n    margin: 0 0 18px;\n    color: var(--cr-black);\n    font-weight: 800;\n  }\n  .cr-section p {\n    font-size: 16.5px;\n    color: var(--cr-text);\n    margin: 0 0 16px;\n  }\n  .cr-section p:last-child { margin-bottom: 0; }\n  .cr-highlight {\n    border-left: 4px solid var(--cr-orange);\n    background: #fff7ef;\n    padding: 20px 24px;\n    border-radius: 0 10px 10px 0;\n    margin: 22px 0 0;\n  }\n  .cr-highlight p { margin: 0; font-size: 16px; }\n  .cr-grid {\n    display: grid;\n    grid-template-columns: 1fr 1fr;\n    gap: 20px;\n    margin-top: 24px;\n  }\n  @media (max-width: 720px) { .cr-grid { grid-template-columns: 1fr; } }\n  .cr-card {\n    background: #ffffff;\n    border: 1px solid var(--cr-line);\n    border-radius: 12px;\n    padding: 26px;\n  }\n  .cr-card-label {\n    display: inline-block;\n    font-size: 11.5px;\n    letter-spacing: 1.5px;\n    text-transform: uppercase;\n    color: var(--cr-orange-deep);\n    font-weight: 700;\n    margin-bottom: 10px;\n  }\n  .cr-card h4 {\n    font-size: 18.5px;\n    margin: 0 0 12px;\n    color: var(--cr-black);\n    font-weight: 700;\n  }\n  .cr-card-divider {\n    width: 42px;\n    height: 3px;\n    background: var(--cr-orange);\n    border-radius: 2px;\n    margin: 0 0 14px;\n  }\n  .cr-card p { font-size: 15.5px; color: var(--cr-muted); margin: 0; }\n  .cr-power {\n    display: grid;\n    grid-template-columns: repeat(3, 1fr);\n    gap: 16px;\n    margin-top: 22px;\n  }\n  @media (max-width: 720px) { .cr-power { grid-template-columns: 1fr; } }\n  .cr-power-cell {\n    background: linear-gradient(160deg, var(--cr-charcoal), var(--cr-black));\n    color: #fff;\n    border-radius: 12px;\n    padding: 24px 20px;\n    text-align: center;\n    border-top: 3px solid var(--cr-orange);\n  }\n  .cr-power-cell .num {\n    display: block;\n    font-size: 30px;\n    font-weight: 800;\n    line-height: 1.1;\n  }\n  .cr-power-cell .unit {\n    display: block;\n    font-size: 13px;\n    letter-spacing: 1px;\n    text-transform: uppercase;\n    color: var(--cr-orange);\n    margin-top: 8px;\n  }\n  .cr-cta {\n    background: linear-gradient(135deg, var(--cr-slate) 0%, var(--cr-charcoal) 50%, var(--cr-black) 100%);\n    color: #fff;\n    padding: 44px;\n    border-radius: 14px;\n    text-align: center;\n    margin-top: 26px;\n    border-top: 4px solid var(--cr-orange);\n  }\n  .cr-cta h3 { color: #fff; font-size: 24px; margin: 0 0 12px; font-weight: 800; }\n  .cr-cta p { color: #d8d8de; font-size: 16.5px; margin: 0 auto; max-width: 680px; }\n\u003c\/style\u003e\n\n  \u003cdiv class=\"cr-hero\"\u003e\n    \u003cspan class=\"cr-eyebrow\"\u003eCrescendo Revolution Series\u003c\/span\u003e\n    \u003ch2\u003eRevolution 5A4 | 4-Channel SQ Amplifier\u003c\/h2\u003e\n    \u003cp\u003eA pure Class AB High Bias power amplifier built for sound quality competition. No crossovers, no coloration, no shortcuts. Just full-bodied, articulate amplification that separates winning systems from the rest.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"cr-section\"\u003e\n    \u003ch3\u003eCompetition-Grade Power, Honestly Rated\u003c\/h3\u003e\n    \u003cp\u003eThe Revolution 5A4 delivers 75 watts per channel at 4 ohms, 125 watts per channel at 2 ohms, and 210 watts per channel bridged at 4 ohms, all rated at 14.4 volts. That is real Class AB High Bias power with the dynamic headroom to render full-bodied vocals and articulate detail at competition judging levels, with a minimum speaker load of 2 ohms.\u003c\/p\u003e\n    \u003cp\u003eThe numbers behind the power tell the SQ story: 0.08% total harmonic distortion at 1 watt across the audible band, a 108 dB signal-to-noise ratio at rated power, channel separation of 58 dB, and an effective damping factor above 150 from 20 Hz to 20 kHz for tight, controlled driver behavior.\u003c\/p\u003e\n    \u003cdiv class=\"cr-power\"\u003e\n      \u003cdiv class=\"cr-power-cell\"\u003e\n\u003cspan class=\"num\"\u003e75W x 4\u003c\/span\u003e\u003cspan class=\"unit\"\u003eRMS at 4 Ohms\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"cr-power-cell\"\u003e\n\u003cspan class=\"num\"\u003e125W x 4\u003c\/span\u003e\u003cspan class=\"unit\"\u003eRMS at 2 Ohms\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"cr-power-cell\"\u003e\n\u003cspan class=\"num\"\u003e210W x 2\u003c\/span\u003e\u003cspan class=\"unit\"\u003eBridged at 4 Ohms\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"cr-section tint\"\u003e\n    \u003ch3\u003eA Pure Amplifier, Built for DSP Systems\u003c\/h3\u003e\n    \u003cp\u003eThe Revolution 5A4 deliberately omits onboard crossovers and bass boost. In a modern SQ build, filtering, time alignment, and EQ belong in the DSP, and anything the amplifier adds to the signal path is something the processor has to fight. By keeping the signal path pure, the 5A4 hands your DSP exactly what it sent: nothing added, nothing subtracted, amplified with authority.\u003c\/p\u003e\n    \u003cp\u003eThe high-resolution signal path carries a frequency response of 7 Hz to 40 kHz at -3 dB, preserving the detail and spatial information in high-resolution sources that narrower amplifiers leave behind. Input sensitivity adjusts from 350 mV to 5 V with a 20 kilohm input impedance, matching cleanly to virtually any processor output.\u003c\/p\u003e\n    \u003cdiv class=\"cr-highlight\"\u003e\n      \u003cp\u003ePair the Revolution 5A4 with a quality DSP such as a Goldhorn processor and the amplifier becomes the foundation of a true competition signal chain: processing handled digitally, power delivered purely.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"cr-section\"\u003e\n    \u003ch3\u003eClass AB High Bias: The SQ Topology\u003c\/h3\u003e\n    \u003cp\u003eThe 5A4 runs a high-bias Class AB output stage, holding the output devices closer to Class A operation than conventional AB designs. The benefit is linearity: lower crossover distortion, better behavior at low listening levels where detail usually disappears, and the refined, dynamic musical character that SQ judges reward.\u003c\/p\u003e\n    \u003cp\u003eThe brushed grey aluminum chassis measures 270 by 150 by 60 millimeters (10.6 by 5.9 by 2.4 inches) at 2.1 kilograms (4.6 pounds), compact enough to mount cleanly in a show build. Protection covers thermal and short circuit conditions. Note that the 5A4 has no onboard fuse, so external fusing at the battery and near the amplifier is required, exactly as a serious installer would plan anyway.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"cr-grid\"\u003e\n    \u003cdiv class=\"cr-card\"\u003e\n      \u003cspan class=\"cr-card-label\"\u003eTopology\u003c\/span\u003e\n      \u003ch4\u003eClass AB High Bias\u003c\/h4\u003e\n      \u003cdiv class=\"cr-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eOutput stage biased toward Class A operation for lower crossover distortion and full detail at low listening levels.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"cr-card\"\u003e\n      \u003cspan class=\"cr-card-label\"\u003eSignal Path\u003c\/span\u003e\n      \u003ch4\u003eHigh-Resolution by Design\u003c\/h4\u003e\n      \u003cdiv class=\"cr-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003e7 Hz to 40 kHz response preserves every detail in high-resolution sources, with 0.08% THD and 108 dB S\/N.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"cr-card\"\u003e\n      \u003cspan class=\"cr-card-label\"\u003ePhilosophy\u003c\/span\u003e\n      \u003ch4\u003eNo Crossovers, No Coloration\u003c\/h4\u003e\n      \u003cdiv class=\"cr-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eA pure power amplifier that leaves filtering and EQ to the DSP, where they belong in a modern SQ build.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"cr-card\"\u003e\n      \u003cspan class=\"cr-card-label\"\u003eControl\u003c\/span\u003e\n      \u003ch4\u003eDamping Factor Above 150\u003c\/h4\u003e\n      \u003cdiv class=\"cr-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eEffective damping from 20 Hz to 20 kHz keeps drivers controlled, for the impactful, precise sound competition demands.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"cr-card\"\u003e\n      \u003cspan class=\"cr-card-label\"\u003eFlexibility\u003c\/span\u003e\n      \u003ch4\u003e2-Ohm Stable, Bridgeable\u003c\/h4\u003e\n      \u003cdiv class=\"cr-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003e125 watts per channel at 2 ohms or 210 watts x 2 bridged at 4 ohms, with input sensitivity from 350 mV to 5 V.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"cr-card\"\u003e\n      \u003cspan class=\"cr-card-label\"\u003eBuild\u003c\/span\u003e\n      \u003ch4\u003eCompact Brushed Aluminum\u003c\/h4\u003e\n      \u003cdiv class=\"cr-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003e10.6 by 5.9 by 2.4 inch brushed grey chassis with thermal and short circuit protection, sized for clean show installs.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"cr-cta\"\u003e\n    \u003ch3\u003eThe Foundation of a Winning System\u003c\/h3\u003e\n    \u003cp\u003eThe Revolution 5A4 does one thing without compromise: amplify. Give it a clean signal from your processor and it delivers the headroom, control, and refinement that put systems on podiums.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Crescendo","offers":[{"title":"Default Title","offer_id":42442886316121,"sku":"5A4","price":779.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/SpecificationAmplifierRevolution5A4B_01.avif?v=1780522314"},{"product_id":"crescendo-revolution-3a4-4-channel-amplifier","title":"Crescendo REVOLUTION 3A4 4 channel Amplifier","description":"\u003cp class=\"text-lg mb-6 leading-relaxed\"\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCrescendo REVOLUTION 3A4\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003erepresents the pinnacle of 4-channel Class AB amplifier engineering, delivering pure analog sound reproduction with exceptional power and clarity. This professional-grade amplifier produces 4 x 70 watts RMS at 4 ohms through advanced Class AB topology, ensuring rich, vibrant sound with the characteristic fidelity that analog amplifiers are renowned for. Manufactured by \u003ca href=\"https:\/\/audiointensity.com\/collections\/crescendo-car-audio\" rel=\"noopener\" target=\"_blank\"\u003eCrescendo Car Audio\u003c\/a\u003e, a leader in competition-level automotive audio solutions, this amplifier combines traditional Class AB warmth with modern engineering precision for discerning audiophiles and professional installations.\u003c\/p\u003e\n\u003ch3 class=\"text-2xl font-semibold mt-8 mb-4 text-blue-700\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003ePure Class AB Sound Excellence\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"mb-6 leading-relaxed\"\u003eProfessional car audio enthusiasts and Sound Quality (SQ) competitors demand the natural warmth and musicality that only pure Class AB amplification can provide, and the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCrescendo REVOLUTION 3A4\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edelivers exactly that authentic analog experience. With its direct gain design and high-resolution playback capability, this amplifier preserves every nuance of the original recording while adding the harmonic richness that makes Class AB topology the preferred choice for critical listening applications. The sophisticated analog circuitry ensures transparent sound reproduction that brings music to life with clarity, depth, and emotional connection.\u003c\/p\u003e\n\u003ch3 class=\"text-2xl font-semibold mt-8 mb-4 text-blue-700\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eHigh-Resolution Audio Performance\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"mb-6 leading-relaxed\"\u003eAt the heart of this amplifier lies advanced circuitry specifically engineered for flawless playback of high-resolution audio files, making it the perfect choice for modern vehicles equipped with digital audio sources. The Revolution 3A4's wide frequency response and low distortion characteristics ensure that every detail from high-bitrate recordings is preserved and reproduced with stunning accuracy. This makes it ideal for audiophiles who demand the ultimate in sound quality from their premium audio collections, whether streaming high-resolution content or playing audiophile-grade recordings.\u003c\/p\u003e\n\u003ch3 class=\"text-2xl font-semibold mt-8 mb-4 text-blue-700\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eCompact Competition-Grade Design\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"mb-6 leading-relaxed\"\u003eDespite its substantial power output and premium construction, the Revolution 3A4 maintains a remarkably compact footprint of just 270mm x 150mm x 60mm, making installation practical in even the most space-constrained vehicles. The precision-engineered chassis features premium cosmetics with a brushed aluminum finish and distinctive black and red accent lines that reflect the amplifier's high-performance capabilities. At just 2.4kg, this amplifier delivers maximum power while minimizing installation complexity, allowing enthusiasts to achieve competition-level performance without compromising valuable vehicle space or requiring extensive mounting modifications.\u003c\/p\u003e","brand":"Crescendo","offers":[{"title":"Default Title","offer_id":42442888380505,"sku":"REVOLUTION 3A4","price":499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/crescendo-revolution-3a4-4-channel-amplifieramplifiercrescendo-6738386.webp?v=1772499973"},{"product_id":"tru-technologies-tungsten-grande-class-ab-4-channel-amplifier","title":"Tru Technologies Tungsten Grande Class AB 4 Channel Amplifier","description":"\u003ch3 class=\"text-2xl font-semibold mb-4 text-blue-600\"\u003eThe Pinnacle of American Car Audio Engineering\u003c\/h3\u003e\n\u003cp class=\"text-lg mb-6 leading-relaxed\"\u003eNew for 2026, the Tru Technology Tungsten Grande TG-RS4 HV v2.5 represents the ultimate evolution of the renowned Tungsten series, delivering uncompromising sound quality in a meticulously crafted 4-channel Class AB amplifier. Individually hand-built in La Crescenta, California, this amplifier embodies the perfect marriage of old school aesthetics with cutting-edge audio engineering, offering enthusiasts the legendary \"slam\" that has made Tru Technology a revered name among audiophiles worldwide.\u003c\/p\u003e\n\u003ch3 class=\"text-2xl font-semibold mb-4 text-blue-600\"\u003eEngineering Excellence Without Compromise\u003c\/h3\u003e\n\u003cp class=\"text-lg mb-6 leading-relaxed\"\u003eBuilt upon the foundation of Tru Technology's acclaimed BILLET and STEEL series heritage, the TG-RS4 HV v2.5 incorporates years of research and development to achieve a perfect balance of power, refinement, and cost-effectiveness. The amplifier features a calculated sequence of SMD and through-hole components, optimized for maximum performance while maintaining the company's unwavering commitment to sound quality. Every connection is strategically positioned along one side of the amplifier for ultra-clean installations and effortless adjustments.\u003c\/p\u003e\n\u003ch3 class=\"text-2xl font-semibold mb-4 text-blue-600\"\u003ePrecision Craftsmanship and Thermal Management\u003c\/h3\u003e\n\u003cp class=\"text-lg mb-6 leading-relaxed\"\u003eThe TG-RS4 HV v2.5 showcases a thermally optimized multi-piece heatsink design that combines sleek classic lines with superior heat dissipation. Constructed from locally sourced extruded aluminum—not overseas die-cast materials—each heatsink undergoes black anodization and precision CNC machining for an impeccable fit and finish. The 4-layer circuit board design enhances signal paths to deliver immense detail with incredible dynamics, while the Class AB topology ensures no thermal rollback, maintaining consistent power delivery even under demanding conditions.\u003c\/p\u003e\n\u003ch3 class=\"text-2xl font-semibold mb-4 text-blue-600\"\u003eThe Tungsten Grande Advantage\u003c\/h3\u003e\n\u003cp class=\"text-lg leading-relaxed\"\u003eAs the \"big brother\" of the standard Tungsten amplifier, the Grande series delivers enhanced power, greater dynamics, and a higher level of refinement that satisfies the most discerning audiophiles. With its compact design philosophy, the TG-RS4 HV v2.5 excels in challenging installation scenarios without sacrificing the meticulous sound quality and reliability that define Tru Technology's reputation. This amplifier creates a new standard for both novice and experienced enthusiasts, offering world-class fidelity, amazing sonic transparency, and dynamic power that transforms any audio system into an extraordinary listening experience.\u003c\/p\u003e","brand":"Tru Technology","offers":[{"title":"Default Title","offer_id":42565846401113,"sku":"TG-RS4 HV v2.5","price":2399.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/tru-technologies-tungsten-grande-class-ab-4-channel-amplifieramplifiertru-technology-6010147.webp?v=1761970726"},{"product_id":"tru-technologies-tungsten-4-channel-amplifier","title":"Tru Technologies Tungsten 4 Channel Amplifier","description":"\u003ch2\u003eOld School Soul Meets Modern Precision\u003c\/h2\u003e\n\u003cp\u003eThe [Tru Technology Tungsten T4](http:\/\/googleusercontent.com\/shopping_content\/1_link) is engineered for those who remember the golden era of car audio—when amplifiers were built with soul, authority, and \"slam.\" While the Grande series is designed for maximum current, the standard T4 focuses on delivering a refined, high-fidelity experience in a more accessible footprint. Hand-built in La Crescenta, California, this 4-channel Class AB powerhouse provides a conservative 100W per channel at 4 ohms, offering the perfect foundation for an active front stage or a high-end component system.\u003c\/p\u003e\n\n\u003ch2\u003eAdvanced 4-Layer PCB and Thermal Integrity\u003c\/h2\u003e\n\u003cp\u003eInternal excellence is the hallmark of the Tungsten series. The T4 utilizes a 4-layer FR4 epoxy circuit board, a significant upgrade over standard boards that allows for shorter signal paths and superior noise rejection. This design ensures that the micro-dynamics of your music remain intact, even in the noisy environment of a vehicle. Coupled with a thermally optimized, multi-piece CNC-machined aluminum heatsink, the T4 operates with zero thermal rollback. This means you get consistent, uncompressed power from the first track to the last, without the \"safety\" throttling found in lesser designs.\u003c\/p\u003e\n\n\u003ch2\u003eThe Experience: Transparency and Mid-Bass Authority\u003c\/h2\u003e\n\u003cp\u003eThe sonic character of the [Tungsten T4](http:\/\/googleusercontent.com\/shopping_content\/2_link) is best described as clinical yet musical. It possesses an incredible ability to control mid-bass drivers, providing the \"impact\" enthusiasts crave, while maintaining a transparent high-frequency response that reveals the smallest details in a recording. With all power and signal connections located on a single side, the T4 is an installer’s dream, allowing for an ultra-clean, symmetrical layout. Whether you are building your first high-end system or are a seasoned competitor, the T4 offers world-class American craftsmanship and legendary performance.\u003c\/p\u003e\n\nhttp:\/\/googleusercontent.com\/shopping_content\/3_card","brand":"Tru Technology","offers":[{"title":"Default Title","offer_id":42614384787545,"sku":"TS-4 HV v2.5","price":1399.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/tru-technologies-tungsten-4-channel-amplifieramplifiertru-technology-2664348.webp?v=1770018966"},{"product_id":"wavtech-link500-4mini-4-channel-amplifier","title":"Wavtech link500.4mini 4 Channel Amplifier","description":"\u003cdiv class=\"pls-desc\"\u003e\n\u003cstyle\u003e\n  .pls-desc {\n    --pls-dark: #0a1730;\n    --pls-deep: #122a5c;\n    --pls-blue: #1c3f8f;\n    --pls-accent: #2f6fe0;\n    --pls-tint: #eef3fb;\n    --pls-line: #d6e1f2;\n    --pls-text: #1a2233;\n    --pls-muted: #4a5568;\n    max-width: 1200px;\n    margin: 0 auto;\n    font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\n    color: var(--pls-text);\n    line-height: 1.6;\n  }\n  .pls-desc * { box-sizing: border-box; }\n  .pls-hero {\n    background: linear-gradient(135deg, var(--pls-dark) 0%, var(--pls-deep) 55%, var(--pls-blue) 100%);\n    color: #fff;\n    padding: 56px 44px;\n    border-radius: 14px;\n    text-align: center;\n  }\n  .pls-hero .pls-eyebrow {\n    display: inline-block;\n    font-size: 13px;\n    letter-spacing: 2.5px;\n    text-transform: uppercase;\n    color: #9dc0ff;\n    font-weight: 700;\n    margin-bottom: 16px;\n  }\n  .pls-hero h2 {\n    font-size: 34px;\n    line-height: 1.2;\n    margin: 0 0 14px;\n    color: #fff;\n    font-weight: 800;\n  }\n  .pls-hero p {\n    font-size: 18px;\n    color: #d4e1f7;\n    max-width: 760px;\n    margin: 0 auto;\n  }\n  .pls-section {\n    background: #ffffff;\n    padding: 40px 44px;\n    margin-top: 26px;\n    border-radius: 14px;\n    border: 1px solid var(--pls-line);\n  }\n  .pls-section.tint { background: var(--pls-tint); }\n  .pls-section h3 {\n    font-size: 25px;\n    margin: 0 0 18px;\n    color: var(--pls-deep);\n    font-weight: 800;\n  }\n  .pls-section p {\n    font-size: 16.5px;\n    color: var(--pls-text);\n    margin: 0 0 16px;\n  }\n  .pls-section p:last-child { margin-bottom: 0; }\n  .pls-highlight {\n    border-left: 4px solid var(--pls-accent);\n    background: #f4f8ff;\n    padding: 20px 24px;\n    border-radius: 0 10px 10px 0;\n    margin: 22px 0 0;\n  }\n  .pls-highlight p { margin: 0; font-size: 16px; }\n  .pls-grid {\n    display: grid;\n    grid-template-columns: 1fr 1fr;\n    gap: 20px;\n    margin-top: 24px;\n  }\n  @media (max-width: 720px) { .pls-grid { grid-template-columns: 1fr; } }\n  .pls-card {\n    background: #ffffff;\n    border: 1px solid var(--pls-line);\n    border-radius: 12px;\n    padding: 26px;\n  }\n  .pls-card-label {\n    display: inline-block;\n    font-size: 11.5px;\n    letter-spacing: 1.5px;\n    text-transform: uppercase;\n    color: var(--pls-accent);\n    font-weight: 700;\n    margin-bottom: 10px;\n  }\n  .pls-card h4 {\n    font-size: 18.5px;\n    margin: 0 0 12px;\n    color: var(--pls-deep);\n    font-weight: 700;\n  }\n  .pls-card-divider {\n    width: 42px;\n    height: 3px;\n    background: var(--pls-accent);\n    border-radius: 2px;\n    margin: 0 0 14px;\n  }\n  .pls-card p { font-size: 15.5px; color: var(--pls-muted); margin: 0; }\n  .pls-power {\n    display: grid;\n    grid-template-columns: repeat(3, 1fr);\n    gap: 16px;\n    margin-top: 22px;\n  }\n  @media (max-width: 720px) { .pls-power { grid-template-columns: 1fr; } }\n  .pls-power-cell {\n    background: linear-gradient(160deg, var(--pls-deep), var(--pls-blue));\n    color: #fff;\n    border-radius: 12px;\n    padding: 24px 20px;\n    text-align: center;\n  }\n  .pls-power-cell .num {\n    display: block;\n    font-size: 30px;\n    font-weight: 800;\n    line-height: 1.1;\n  }\n  .pls-power-cell .unit {\n    display: block;\n    font-size: 13px;\n    letter-spacing: 1px;\n    text-transform: uppercase;\n    color: #b9d0f7;\n    margin-top: 8px;\n  }\n  .pls-cta {\n    background: linear-gradient(135deg, var(--pls-blue) 0%, var(--pls-deep) 50%, var(--pls-dark) 100%);\n    color: #fff;\n    padding: 44px;\n    border-radius: 14px;\n    text-align: center;\n    margin-top: 26px;\n  }\n  .pls-cta h3 { color: #fff; font-size: 24px; margin: 0 0 12px; font-weight: 800; }\n  .pls-cta p { color: #d4e1f7; font-size: 16.5px; margin: 0 auto; max-width: 680px; }\n\u003c\/style\u003e\n\n  \u003cdiv class=\"pls-hero\"\u003e\n    \u003cspan class=\"pls-eyebrow\"\u003eWavtech Mini Series\u003c\/span\u003e\n    \u003ch2\u003elink500.4mini | 500 Watt 4-Channel Amplifier\u003c\/h2\u003e\n    \u003cp\u003eThe front-speakers-plus-subwoofer amplifier. Run components up front and a real subwoofer off one compact chassis, with bass processing built into the sub channels and clean factory integration throughout.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pls-section\"\u003e\n    \u003ch3\u003eBuilt for the Most Common Upgrade\u003c\/h3\u003e\n    \u003cp\u003eNew front speakers and a subwoofer is the most popular aftermarket audio upgrade there is, and the link500.4mini was designed around exactly that build. In 3-channel mode it delivers 125 watts x 2 to the main speakers and 250 watts x 1 to the subwoofer, so neither end of the system is starved. Run as a straight 4-channel, it produces 75 watts RMS per channel at 4 ohms and 125 watts RMS per channel at 2 ohms, with 250 watts x 2 available bridged at 4 ohms.\u003c\/p\u003e\n    \u003cp\u003eAll of it lives in a chassis just 9.2 by 4.5 by 1.65 inches, narrow enough to mount where conventional amplifiers will not go.\u003c\/p\u003e\n    \u003cdiv class=\"pls-power\"\u003e\n      \u003cdiv class=\"pls-power-cell\"\u003e\n\u003cspan class=\"num\"\u003e75W x 4\u003c\/span\u003e\u003cspan class=\"unit\"\u003eRMS at 4 Ohms\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"pls-power-cell\"\u003e\n\u003cspan class=\"num\"\u003e125W x 4\u003c\/span\u003e\u003cspan class=\"unit\"\u003eRMS at 2 Ohms\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"pls-power-cell\"\u003e\n\u003cspan class=\"num\"\u003e250W x 2\u003c\/span\u003e\u003cspan class=\"unit\"\u003eRMS at 4 Ohms BTL\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pls-section tint\"\u003e\n    \u003ch3\u003eReal Bass Tuning on the Sub Channels\u003c\/h3\u003e\n    \u003cp\u003eThis is what separates the link500.4mini from other compact 4-channels. Channels 3 and 4 carry a 1-band parametric EQ and a variable subsonic filter, so when they are bridged for subwoofer duty the bass stage gets real tuning tools. The parametric EQ corrects the cabin resonance every vehicle has, and the subsonic filter protects the driver from over-excursion below its usable range.\u003c\/p\u003e\n    \u003cp\u003eAdd the optional linkRC remote and the subwoofer level on channels 3\/4 adjusts from the front seat, so bass can be matched to the music on the fly. Fully adjustable high-pass and low-pass crossovers at 12dB per octave handle the frequency split between the front stage and the sub.\u003c\/p\u003e\n    \u003cdiv class=\"pls-highlight\"\u003e\n      \u003cp\u003eThe result is a complete components-plus-subwoofer system, tuned and protected, from one amplifier with one power run and one mounting location.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pls-section\"\u003e\n    \u003ch3\u003eClean Factory Integration, No Outboard Processor\u003c\/h3\u003e\n    \u003cp\u003eThe link500.4mini carries Wavtech's adaptive loading technology and accepts up to 40V of hi-level input, so it ties directly into demanding factory systems. For factory audio where no full-range signal is present, built-in summing with level trim recombines the split signals internally, with no external processor required. Differential balanced inputs reject system noise, and auto turn-on works through DC-offset or audio signal detection when no remote wire is available.\u003c\/p\u003e\n    \u003cp\u003eIt is Start\/Stop system compatible, and the build follows the Mini Series formula: compact aluminum chassis with detachable mounting tabs, Active Thermal Management, locking detachable hi-level speaker terminals, 4-gauge power and ground terminals, and variable gain with a clip LED for precise level matching.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pls-grid\"\u003e\n    \u003cdiv class=\"pls-card\"\u003e\n      \u003cspan class=\"pls-card-label\"\u003eArchitecture\u003c\/span\u003e\n      \u003ch4\u003e3-Channel Mode\u003c\/h4\u003e\n      \u003cdiv class=\"pls-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003e125 watts x 2 for the main speakers plus 250 watts x 1 bridged for the subwoofer. The components-plus-sub build from one amp.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pls-card\"\u003e\n      \u003cspan class=\"pls-card-label\"\u003eBass Tuning\u003c\/span\u003e\n      \u003ch4\u003ePEQ + Subsonic on CH 3\/4\u003c\/h4\u003e\n      \u003cdiv class=\"pls-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eA 1-band parametric EQ corrects cabin resonance and a variable subsonic filter protects the sub below its usable range.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pls-card\"\u003e\n      \u003cspan class=\"pls-card-label\"\u003eControl\u003c\/span\u003e\n      \u003ch4\u003elinkRC Ready\u003c\/h4\u003e\n      \u003cdiv class=\"pls-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eOptional remote level control adjusts channels 3\/4 from the front seat to fine tune subwoofer output on the fly.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pls-card\"\u003e\n      \u003cspan class=\"pls-card-label\"\u003eSignal\u003c\/span\u003e\n      \u003ch4\u003eBuilt-In Summing\u003c\/h4\u003e\n      \u003cdiv class=\"pls-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eRecombines split factory signals internally with level trim adjustment. No outboard summing processor needed.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pls-card\"\u003e\n      \u003cspan class=\"pls-card-label\"\u003eIntegration\u003c\/span\u003e\n      \u003ch4\u003e40V Input + Adaptive Loading\u003c\/h4\u003e\n      \u003cdiv class=\"pls-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eAccepts high-level signal from demanding factory amplifiers with differential balanced inputs that reject noise.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pls-card\"\u003e\n      \u003cspan class=\"pls-card-label\"\u003eFootprint\u003c\/span\u003e\n      \u003ch4\u003e9.2 x 4.5 x 1.65 Inches\u003c\/h4\u003e\n      \u003cdiv class=\"pls-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eMini Series width with Active Thermal Management, so real system power fits where full-size amps cannot.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pls-cta\"\u003e\n    \u003ch3\u003eComponents Up Front, Bass in the Back, One Amp\u003c\/h3\u003e\n    \u003cp\u003eThe link500.4mini powers the most popular upgrade in car audio from a single compact chassis, with the bass tuning tools and factory integration to do it right.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Wavtech","offers":[{"title":"Default Title","offer_id":42832249454681,"sku":null,"price":449.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/wavtech-link5004mini-4-channel-amplifieramplifierwavtech-2074547.webp?v=1764434096"},{"product_id":"us-acoustics-barbara-ann-4-channel-class-ab-amplifier-4-x-100w","title":"US Acoustics Barbara Ann | 4 Channel Class AB Amplifier | 4 x 100w","description":"\u003cstyle\u003e\n  .usa-wrap { max-width: 100%; font-family: inherit; color: #e4e4e7 !important; }\n  .usa-hero { background: #18181b !important; border: 1px solid #3f3f46 !important; color: #ffffff !important; padding: 36px 28px; border-radius: 12px; margin-bottom: 28px; border-bottom: 4px solid #b91c1c !important; }\n  .usa-eyebrow { color: #ef4444 !important; font-size: 13px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; margin: 0 0 10px 0; }\n  .usa-hero h2 { color: #ffffff !important; font-size: 28px; margin: 0 0 8px 0; line-height: 1.2; }\n  .usa-hero p { color: #f4f4f5 !important; font-size: 16px; margin: 0 0 18px 0; }\n  .usa-badges { display: flex; flex-wrap: wrap; gap: 8px; }\n  .usa-badge { background: #b91c1c !important; color: #ffffff !important; font-size: 13px; font-weight: 600; padding: 6px 12px; border-radius: 4px; }\n  .usa-badge-alt { background: #27272a !important; color: #ffffff !important; border: 1px solid #b91c1c !important; }\n  .usa-wrap h3 { color: #ffffff !important; font-size: 22px; margin: 28px 0 12px 0; border-left: 4px solid #b91c1c !important; padding-left: 12px; }\n  .usa-wrap h4 { color: #ef4444 !important; font-size: 17px; margin: 20px 0 8px 0; }\n  .usa-wrap p { color: #e4e4e7 !important; font-size: 16px; line-height: 1.65; margin: 0 0 14px 0; }\n  .usa-callout { background: #27272a !important; border: 1px solid #ef4444 !important; border-radius: 8px; padding: 18px 20px; margin: 22px 0; }\n  .usa-callout p { color: #f4f4f5 !important; margin: 0; }\n  .usa-statgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin: 22px 0; }\n  .usa-stat { background: #18181b !important; border: 1px solid #3f3f46 !important; border-radius: 8px; padding: 16px; text-align: center; }\n  .usa-stat .usa-statnum { color: #ffffff !important; font-size: 22px; font-weight: 700; display: block; }\n  .usa-stat .usa-statlabel { color: #ef4444 !important; font-size: 12px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; display: block; margin-top: 4px; }\n  .usa-cta { background: #18181b !important; border: 1px solid #3f3f46 !important; color: #ffffff !important; padding: 28px; border-radius: 12px; margin-top: 30px; text-align: center; border-top: 4px solid #b91c1c !important; }\n  .usa-cta h3 { color: #ffffff !important; border-left: none !important; padding-left: 0; margin-top: 0; }\n  .usa-cta p { color: #f4f4f5 !important; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"usa-wrap\"\u003e\n\n  \u003cdiv class=\"usa-hero\"\u003e\n    \u003cp class=\"usa-eyebrow\"\u003eUS Acoustics Analog 4-Channel Series\u003c\/p\u003e\n    \u003ch2\u003eUS Acoustics Barbara Ann 4-Channel Class AB Amplifier\u003c\/h2\u003e\n    \u003cp\u003eThe audiophile four-channel. 100 honest watts per channel, high-end op amps, and a crossover set wide enough to run a real active front stage.\u003c\/p\u003e\n    \u003cdiv class=\"usa-badges\"\u003e\n      \u003cspan class=\"usa-badge\"\u003e100W x 4 @ 4 Ohms\u003c\/span\u003e\n      \u003cspan class=\"usa-badge\"\u003e175W x 4 @ 2 Ohms\u003c\/span\u003e\n      \u003cspan class=\"usa-badge\"\u003e350W x 2 Bridged @ 4 Ohms\u003c\/span\u003e\n      \u003cspan class=\"usa-badge usa-badge-alt\"\u003e2-Year Warranty\u003c\/span\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eFour Channels, Built for Sound Quality\u003c\/h3\u003e\n  \u003cp\u003eThe US Acoustics Barbara Ann delivers 100 watts RMS per channel into 4 ohms, 175 watts RMS per channel into 2 ohms, and 350 watts RMS x 2 bridged into 4 ohms, all rated at 14.4 volts. It pairs the Full Complementary Class AB output stage with audiophile high-end op amps in the signal path, the same sound-quality-first approach found in the six-channel Lanna.\u003c\/p\u003e\n  \u003cp\u003eThe measurements reflect the intent: total harmonic distortion below 0.01 percent, signal-to-noise above 97 dB, channel separation above 92 dB, and a damping factor greater than 200 at 100 Hz into 4 ohms. This is double the power of the Lisa with meaningfully higher measured performance across the board, the four-channel for a listener who cares how the system sounds, not just how loud it gets.\u003c\/p\u003e\n\n  \u003cdiv class=\"usa-statgrid\"\u003e\n    \u003cdiv class=\"usa-stat\"\u003e\n\u003cspan class=\"usa-statnum\"\u003e\u0026lt;0.01%\u003c\/span\u003e\u003cspan class=\"usa-statlabel\"\u003eTHD\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"usa-stat\"\u003e\n\u003cspan class=\"usa-statnum\"\u003e\u0026gt;97 dB\u003c\/span\u003e\u003cspan class=\"usa-statlabel\"\u003eS\/N Ratio\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"usa-stat\"\u003e\n\u003cspan class=\"usa-statnum\"\u003e\u0026gt;92 dB\u003c\/span\u003e\u003cspan class=\"usa-statlabel\"\u003eChannel Separation\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"usa-stat\"\u003e\n\u003cspan class=\"usa-statnum\"\u003e\u0026gt;200\u003c\/span\u003e\u003cspan class=\"usa-statlabel\"\u003eDamping Factor\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eA Crossover Set That Can Run Active\u003c\/h3\u003e\n  \u003cp\u003eThis is where the Barbara Ann separates itself. Each channel pair carries independent Butterworth filters with unusually wide ranges. The 12 dB per octave high-pass covers 15 to 500 Hz and 50 Hz to 3 kHz, and the 24 dB per octave low-pass covers 50 to 500 Hz and 500 Hz to 5 kHz. That low-pass reaching 5 kHz is the key: it means one channel pair can run midrange duty while the other handles midbass, giving you a true active 2-way front stage from the amplifier alone, no external processor required. Add a Goldhorn DSP if you want time alignment and EQ on top, but the Barbara Ann can stand on its own filters in a way most four-channels cannot.\u003c\/p\u003e\n\n  \u003ch3\u003eThree Ways to Run the Barbara Ann\u003c\/h3\u003e\n  \u003ch4\u003eActive 2-Way Front Stage\u003c\/h4\u003e\n  \u003cp\u003eOne channel pair on tweeters or midranges, the other on midbass, each with its own crossover. A complete active front stage with 100 watts to every driver.\u003c\/p\u003e\n  \u003ch4\u003ePremium Four-Speaker System\u003c\/h4\u003e\n  \u003cp\u003eFront and rear pairs each get 100 watts of clean, low distortion Class AB power, a serious upgrade for a full-range four-speaker system.\u003c\/p\u003e\n  \u003ch4\u003eFront Stage Plus Bridged Subwoofer\u003c\/h4\u003e\n  \u003cp\u003eRun a component front stage on channels 1 and 2, bridge channels 3 and 4 to 350 watts for a single subwoofer, and you have a complete high-quality system from one amplifier.\u003c\/p\u003e\n\n  \u003cdiv class=\"usa-callout\"\u003e\n    \u003cp\u003e\u003cstrong\u003eInstall notes:\u003c\/strong\u003e the Barbara Ann measures 17.7 x 8.9 x 2.2 inches with three 35A onboard fuses. Class AB runs warmer than Class D, so mount it with airflow in mind. Angled terminals keep the wiring clean in show-quality installations.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eBuilt to the US Acoustics Standard\u003c\/h3\u003e\n  \u003cp\u003eProtection circuitry covers DC, short circuit, thermal, and overload conditions, with diagnostic LEDs for fast troubleshooting. Every Barbara Ann sold by Audio Intensity is brand new from US Acoustics with a 2-year warranty through authorized dealers.\u003c\/p\u003e\n\n  \u003cdiv class=\"usa-cta\"\u003e\n    \u003ch3\u003eAuthorized US Acoustics Dealer\u003c\/h3\u003e\n    \u003cp\u003eAudio Intensity ships the US Acoustics Barbara Ann fast from Tullahoma, Tennessee, with real installer support before and after the sale. Thinking about running it active? Tell us your speakers and we will help you set crossover points that get the most from this amplifier.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"US Acoustics","offers":[{"title":"Default Title","offer_id":42858709549145,"sku":null,"price":399.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/us-acoustics-barbara-ann-4-channel-class-ab-amplifier-4-x-100wamplifierus-acoustics-2667976.jpg?v=1764434179"},{"product_id":"us-acoustics-lisa-4-channel-class-ab-amplifier-4-x-50w","title":"US Acoustics Lisa | 4 Channel Class AB Amplifier | 4 x 50w","description":"\u003cstyle\u003e\n  .usa-wrap { max-width: 100%; font-family: inherit; color: #e4e4e7 !important; }\n  .usa-hero { background: #18181b !important; border: 1px solid #3f3f46 !important; color: #ffffff !important; padding: 36px 28px; border-radius: 12px; margin-bottom: 28px; border-bottom: 4px solid #b91c1c !important; }\n  .usa-eyebrow { color: #ef4444 !important; font-size: 13px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; margin: 0 0 10px 0; }\n  .usa-hero h2 { color: #ffffff !important; font-size: 28px; margin: 0 0 8px 0; line-height: 1.2; }\n  .usa-hero p { color: #f4f4f5 !important; font-size: 16px; margin: 0 0 18px 0; }\n  .usa-badges { display: flex; flex-wrap: wrap; gap: 8px; }\n  .usa-badge { background: #b91c1c !important; color: #ffffff !important; font-size: 13px; font-weight: 600; padding: 6px 12px; border-radius: 4px; }\n  .usa-badge-alt { background: #27272a !important; color: #ffffff !important; border: 1px solid #b91c1c !important; }\n  .usa-wrap h3 { color: #ffffff !important; font-size: 22px; margin: 28px 0 12px 0; border-left: 4px solid #b91c1c !important; padding-left: 12px; }\n  .usa-wrap h4 { color: #ef4444 !important; font-size: 17px; margin: 20px 0 8px 0; }\n  .usa-wrap p { color: #e4e4e7 !important; font-size: 16px; line-height: 1.65; margin: 0 0 14px 0; }\n  .usa-callout { background: #27272a !important; border: 1px solid #ef4444 !important; border-radius: 8px; padding: 18px 20px; margin: 22px 0; }\n  .usa-callout p { color: #f4f4f5 !important; margin: 0; }\n  .usa-statgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin: 22px 0; }\n  .usa-stat { background: #18181b !important; border: 1px solid #3f3f46 !important; border-radius: 8px; padding: 16px; text-align: center; }\n  .usa-stat .usa-statnum { color: #ffffff !important; font-size: 22px; font-weight: 700; display: block; }\n  .usa-stat .usa-statlabel { color: #ef4444 !important; font-size: 12px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; display: block; margin-top: 4px; }\n  .usa-cta { background: #18181b !important; border: 1px solid #3f3f46 !important; color: #ffffff !important; padding: 28px; border-radius: 12px; margin-top: 30px; text-align: center; border-top: 4px solid #b91c1c !important; }\n  .usa-cta h3 { color: #ffffff !important; border-left: none !important; padding-left: 0; margin-top: 0; }\n  .usa-cta p { color: #f4f4f5 !important; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"usa-wrap\"\u003e\n\n  \u003cdiv class=\"usa-hero\"\u003e\n    \u003cp class=\"usa-eyebrow\"\u003eUS Acoustics Analog 4-Channel Series\u003c\/p\u003e\n    \u003ch2\u003eUS Acoustics Lisa 4-Channel Class AB Amplifier\u003c\/h2\u003e\n    \u003cp\u003eHonest Full Complementary Class AB power for a complete four-speaker system, in a chassis barely over a foot long. The most accessible way into real US Acoustics analog sound.\u003c\/p\u003e\n    \u003cdiv class=\"usa-badges\"\u003e\n      \u003cspan class=\"usa-badge\"\u003e50W x 4 @ 4 Ohms\u003c\/span\u003e\n      \u003cspan class=\"usa-badge\"\u003e85W x 4 @ 2 Ohms\u003c\/span\u003e\n      \u003cspan class=\"usa-badge\"\u003e170W x 2 Bridged @ 4 Ohms\u003c\/span\u003e\n      \u003cspan class=\"usa-badge usa-badge-alt\"\u003e2-Year Warranty\u003c\/span\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eReal Class AB Power for the Whole Vehicle\u003c\/h3\u003e\n  \u003cp\u003eThe US Acoustics Lisa delivers 50 watts RMS per channel into 4 ohms and 85 watts RMS per channel into 2 ohms across four channels, rated honestly at 14.4 volts. Bridged, it produces 170 watts RMS x 2 into 4 ohms. That is genuine Full Complementary Class AB output on every speaker in the vehicle, the same low distortion topology US Acoustics has built for over 25 years, with total harmonic distortion below 0.01 percent.\u003c\/p\u003e\n  \u003cp\u003eFifty clean watts per channel transforms a factory-grade system. Most stock head units produce under 20 watts per channel with audible distortion well before full volume. The Lisa replaces that with low distortion power and headroom that lets aftermarket speakers do what they were designed to do.\u003c\/p\u003e\n\n  \u003cdiv class=\"usa-statgrid\"\u003e\n    \u003cdiv class=\"usa-stat\"\u003e\n\u003cspan class=\"usa-statnum\"\u003e\u0026lt;0.01%\u003c\/span\u003e\u003cspan class=\"usa-statlabel\"\u003eTHD\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"usa-stat\"\u003e\n\u003cspan class=\"usa-statnum\"\u003e\u0026gt;95 dB\u003c\/span\u003e\u003cspan class=\"usa-statlabel\"\u003eS\/N Ratio\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"usa-stat\"\u003e\n\u003cspan class=\"usa-statnum\"\u003e\u0026gt;85 dB\u003c\/span\u003e\u003cspan class=\"usa-statlabel\"\u003eChannel Separation\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"usa-stat\"\u003e\n\u003cspan class=\"usa-statnum\"\u003e\u0026gt;100\u003c\/span\u003e\u003cspan class=\"usa-statlabel\"\u003eDamping Factor\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eIndependent Butterworth Crossovers on Each Pair\u003c\/h3\u003e\n  \u003cp\u003eChannels 1 and 2 and channels 3 and 4 carry independent Butterworth crossover filters. The 12 dB per octave high-pass covers ranges from 15 to 500 Hz and 50 Hz to 3 kHz, and the 24 dB per octave low-pass sweeps from 55 Hz to 3.5 kHz. Those wide ranges give the Lisa flexibility well beyond basic front and rear duty, including active 2-way component configurations with the right system design. There is no bass boost, subsonic filter, or phase control on this model.\u003c\/p\u003e\n\n  \u003ch3\u003eThree Ways to Run the Lisa\u003c\/h3\u003e\n  \u003ch4\u003eFour-Speaker System Upgrade\u003c\/h4\u003e\n  \u003cp\u003eThe classic configuration. Front and rear pairs each get 50 watts of clean Class AB power, a night and day step up from head unit power for a daily driver.\u003c\/p\u003e\n  \u003ch4\u003eFront Stage Plus Bridged Rear\u003c\/h4\u003e\n  \u003cp\u003eChannels 1 and 2 on a front component set, channels 3 and 4 bridged to 170 watts on a small sealed subwoofer. A complete starter sound quality system from one compact amplifier.\u003c\/p\u003e\n  \u003ch4\u003eFully Bridged 2-Channel\u003c\/h4\u003e\n  \u003cp\u003eBoth pairs bridged delivers 170 watts x 2 into 4 ohms, serious power for a quality component set in a simple stereo configuration.\u003c\/p\u003e\n\n  \u003cdiv class=\"usa-callout\"\u003e\n    \u003cp\u003e\u003cstrong\u003eCompact by design:\u003c\/strong\u003e at 12.4 x 8.9 x 2.2 inches, the Lisa fits under seats and in tight enclosures where full-size amplifiers will not. Internal fusing is 2 x 25A. Docking Pads reduce vibration transfer to extend amplifier life.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eBuilt to the Same Standard as the Big Amps\u003c\/h3\u003e\n  \u003cp\u003eAngled terminals for clean wiring, DC, short circuit, thermal, and overload protection with diagnostic LEDs, and the same 2-year warranty that covers the entire US Acoustics line through authorized dealers. Every Lisa sold by Audio Intensity is brand new from US Acoustics.\u003c\/p\u003e\n\n  \u003cdiv class=\"usa-cta\"\u003e\n    \u003ch3\u003eAuthorized US Acoustics Dealer\u003c\/h3\u003e\n    \u003cp\u003eAudio Intensity ships the US Acoustics Lisa fast from Tullahoma, Tennessee, with real installer support before and after the sale. Not sure if 50 watts per channel is right for your speakers? Ask us. We match amplifiers to systems every day, and we will tell you the truth about what you need.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"US Acoustics","offers":[{"title":"Default Title","offer_id":42858718953561,"sku":null,"price":159.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/268-9004_HR_0.default.avif?v=1780789493"},{"product_id":"prodigy-audio-600-watt-4-channel-amplifier-nbm100-4","title":"Prodigy Audio 600 Watt 4 Channel Amplifier | NBM100.4","description":"\u003ch2\u003eHigh-Fidelity Power in a Micro-Chassis Footprint\u003c\/h2\u003e\n\u003cp\u003eThe Prodigy Audio NBM100.4 is a high-efficiency Class D 4-channel amplifier engineered for enthusiasts who demand audiophile-grade output without sacrificing cabin space. Delivering a conservative 100 Watts RMS per channel at 4 Ohms, this micro-amplifier provides the headroom necessary to drive high-end components or coaxial speakers with surgical precision. Its compact aluminum heat sink is designed for maximum thermal dissipation, allowing for stealth installations under seats, behind dash panels, or in motorcycle fairings where airflow is limited.\u003c\/p\u003e\n\n\u003ch2\u003eAdvanced Class D Topology and Signal Integrity\u003c\/h2\u003e\n\u003cp\u003eBuilt on a modern Full-Range Class D architecture, the NBM100.4 achieves over 80% efficiency, significantly reducing current draw on your vehicle's electrical system while minimizing heat output. The internal circuitry features high-grade capacitors and shielded inductors to maintain a high Signal-to-Noise ratio, ensuring that your music remains transparent and free of floor noise. With a frequency response spanning 20Hz to 20kHz, this amplifier captures the full spectrum of your recordings, from the snap of a snare to the shimmer of a cymbal.\u003c\/p\u003e\n\n\u003ch2\u003ePrecision Tuning for Integrated Systems\u003c\/h2\u003e\n\u003cp\u003eIntegration flexibility is at the heart of the NBM series. The NBM100.4 features fully adjustable High-Pass and Low-Pass crossovers (40Hz - 400Hz), allowing you to perfectly phase-link your door speakers with your subwoofer system. Whether you are running a traditional 4-channel setup or bridging the rear channels to power a small subwoofer at 300 Watts @ 4 Ohms, the NBM100.4 provides the versatility required for complex system builds. Its 4-way protection circuitry (Thermal, Voltage, Short, and Offset) ensures that your investment stays protected even under demanding playback conditions.\u003c\/p\u003e","brand":"Prodigy","offers":[{"title":"Default Title","offer_id":43050976837721,"sku":"NBM100.4","price":225.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/prodigy-audio-600-watt-4-channel-amplifier-nbm1004amplifierprodigy-2981270.webp?v=1770621681"},{"product_id":"prodigy-audio-1200-watt-4-channel-amplifier-nb300-4","title":"Prodigy Audio 1200 Watt 4 Channel Amplifier | NB300.4","description":"\u003ch2\u003eHigh-Voltage Precision: The 1200W 4-Channel Benchmark\u003c\/h2\u003e\n\n\u003cp\u003eThe Prodigy Audio NB300.4 represents the pinnacle of high-output multi-channel amplification. Engineered in South Korea, this full-range Class D powerhouse is designed for the audiophile who demands extreme volume without sacrificing the nuanced detail of their front stage. Delivering a massive 300 Watts RMS per channel at 2 Ohms, the NB300.4 provides the necessary headroom to drive high-fidelity components to their absolute thermal limits. Its sophisticated PCB layout utilizes high-tolerance MOSFETs and shielded output inductors to maintain a pristine signal-to-noise ratio, ensuring your music remains transparent even at competition-level output.\u003c\/p\u003e\n\n\u003ch2\u003eAdvanced Crossover Architecture and System Versatility\u003c\/h2\u003e\n\n\u003cp\u003ePrecision tuning is a standard feature of the NB series. The NB300.4 is equipped with a comprehensive crossover suite, including High-Pass and Low-Pass filters adjustable from 50Hz to 500Hz. This flexibility allows for seamless integration into active 2-way systems or high-power 3-channel configurations. When bridged at 4 Ohms, the NB300.4 transforms into a dual-mono beast, outputting 600 Watts x 2. This makes it an ideal solution for powering massive mid-bass arrays or high-efficiency pro-audio drivers that require substantial current to achieve linear excursion.\u003c\/p\u003e\n\n\u003ch2\u003eBuilt for Endurance and Intelligence\u003c\/h2\u003e\n\n\u003cp\u003eEncased in a heavy-duty aluminum heatsink with an integrated high-speed cooling fan, the NB300.4 is built to withstand the rigors of extreme daily use. The amplifier features 4-way protection circuitry to guard against thermal overload, short circuits, and voltage fluctuations. To provide the driver with total control, the NB300.4 includes a remote monitoring knob featuring a digital voltmeter and a clipping indicator. This allows for real-time adjustments and ensures that your system is always operating within its safe, distortion-free \"sweet spot,\" protecting your investment while maximizing acoustic impact.\u003c\/p\u003e","brand":"Prodigy","offers":[{"title":"Default Title","offer_id":43051029758041,"sku":"NB300.4","price":416.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/prodigy-audio-1200-watt-4-channel-amplifier-nb3004amplifierprodigy-6314458.png?v=1770621681"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/collections\/4-channel-amplifier-8987433.jpg?v=1778814219","url":"https:\/\/audiointensity.com\/collections\/4-channel-amplifiers.oembed?page=3","provider":"Audio Intensity","version":"1.0","type":"link"}