Monoblock, 2-channel, 4-channel, and multi-channel amplification from seven brands.
A car amplifier is the single most impactful upgrade you can make to a car audio system. Factory head units produce weak, distorted output at anything above moderate volume, not because the speakers are bad, but because the built-in amplifier doesn't have the headroom to drive them cleanly. A dedicated amplifier solves that problem at the source, delivering clean, stable power that lets every component in your system perform the way it was designed to.
Audio Intensity stocks car amplifiers across every class and channel count: monoblock amplifiers for subwoofers, 2-channel amplifiers for component speaker systems, 4-channel amplifiers for full front and rear stage builds, and multi-channel amplifiers for complex systems that need everything in one unit. Brands include Crescendo, Wavtech, Tru Technology, Audio Wave, US Acoustics, Image Dynamics, and Arc Audio, a mix of competition-proven and audiophile-focused designs that covers everything from daily drivers to reference-level builds.
Every amplifier in this collection is sold by an authorized dealer with full manufacturer warranty. We're not a marketplace. We're car audio builders who use and install this equipment, and we're available to help you choose the right amplifier for your specific system before you buy.
Not sure which amplifier fits your system? Contact us with your subwoofer or speaker specs and we'll recommend the right match.
Authorized Dealer
Every amplifier is brand new with the full manufacturer warranty.
Power Matching
Send us your subwoofer or speaker specs. We'll recommend the right amplifier at the right impedance before you buy.
Hands-On Expertise
Direct support from staff who designs, builds, and competes with these systems. Honest recommendations, not upsells.
Fast Shipping from TN
In-stock orders ship within 1-2 business days from our Tullahoma, Tennessee warehouse.
Amplifier selection is where most car audio builds go wrong. Buyers focus on the wattage number on the box rather than the class of amplifier, the channel configuration, or whether the rated power is actually delivered at a usable impedance. Getting this decision right the first time is what separates a system that sounds the way you intended from one that underperforms or damages components.
Channel Configuration
The channel count of the amplifier should match what it's powering. Use this as the starting point.
Monoblock (1-channel): Built for powering a single subwoofer with full rated output into one channel. The standard choice for subwoofer amplification in any car audio system. Most monoblock amps are stable at 1 or 2 ohms, which provides flexibility in wiring configurations. Match the amplifier's RMS power at your subwoofer's wired impedance to the driver's RMS rating.
2-channel: Built for powering a front stage component speaker system, with one channel per side driving the woofer and tweeter through a passive crossover. For listeners focused on sound quality and front stage imaging, a dedicated 2-channel amplifier for the front speakers paired with a separate monoblock for the subwoofer is the cleanest system topology.
4-channel: Powers front and rear speakers from a single unit, or can be bridged to mono on two channels to drive a subwoofer while the remaining channels handle the front stage. Practical for builds where space and budget favor a single amplifier over multiple dedicated units. Modern 4-channel designs from Crescendo, Eton, and Xcelsus deliver performance that makes the compromise worthwhile.
5+ channel: For complex systems including active crossover builds, OEM integration projects, and competition-level setups that need more channels than a 4-channel amplifier provides. Many 5+ channel amplifiers include integrated DSP, which gives you channel count, processing power, and physical consolidation in a single unit.
Amplifier Classes Explained
Class D: The dominant technology in modern car audio. Operates at 80-90% efficiency, which means less heat, smaller physical footprints, and less electrical draw on your vehicle's charging system. Class D designs have improved dramatically over the past decade. Modern Class D from quality manufacturers (Wavtech Link series, Crescendo Revolution line, Image Dynamics SQ) is sonically transparent and appropriate for any application including critical listening.
Class AB: Operates at 50-65% efficiency with more heat and larger physical size for equivalent power output. The tradeoff is a bias current that keeps the output transistors partially on at all times, eliminating the crossover distortion that early Class D designs suffered from. For critical listening applications where absolute sonic transparency is the goal, a high-bias Class AB design (Tru Technology, Audio Wave Excel) remains the reference standard.
Class A: The audiophile reference. Operates with the output transistors continuously on, which produces the cleanest possible signal at the cost of significantly higher heat dissipation and current draw. Class A amplifiers are physically large, run hot, and require electrical system upgrades to power. The Audio Wave Excel CA and TRU Technology Billet B22-A V2.5 are the reference 2-channel Class A designs in this collection.
The Brands We Carry
Audio Intensity carries amplifiers from seven brands, each filling a specific use case in the catalog.
Crescendo: Competition-proven Class D amplifiers built around high-efficiency motor structures. The Revolution line covers monoblock, 2-channel, and 4-channel configurations for SQ and SPL-focused builds. The right pick for buyers who want clean modern Class D power matched to demanding driver lineups.
Wavtech: Compact Class D amplifiers engineered for high power density. The Link series (Link5001Mini, Link1000.1mini, Link1500.1plus) is the standard for tight-install behind-seat builds where amplifier footprint matters. Wavtech amplifiers pair naturally with the Wavtech thinPRO subwoofer line.
Tru Technology: Audiophile-grade Class AB and Class A reference amplifiers. The Billet series represents the top tier of car audio amplification, with hand-built construction and competition-proven performance. The right choice for buyers building reference-level SQ systems where sound quality is the absolute priority.
Audio Wave: Reference Class A amplification. The Excel CA and Aspire Pro V2 are top-tier 2-channel Class A designs for serious SQ builds, with the CR-30X representing a Class A monoblock approach to subwoofer amplification. The high end of the catalog.
US Acoustics: High-output monoblock amplifiers (Mike, Nick, Big Ben) built for SPL-focused builds. The right pick for buyers running high-output subwoofer systems where amplifier headroom matters more than sonic refinement.
Image Dynamics: The SQ series of full-range and monoblock amplifiers (SQ600.1D, SQ800.4, SQ1200.1D). Built with International Rectifier circuitry for clean power in a compact form factor. Pairs naturally with Image Dynamics IDQ and IDMAX subwoofers.
Arc Audio: Audiophile-grade amplification with a focus on musical accuracy. The Arc and X2 series cover SQ-focused builds with Arc Audio's signature sound character.
Power Matching
Match the amplifier's RMS output at your wired impedance to the speaker or subwoofer's RMS rating. RMS is continuous power; peak ratings are marketing numbers and should be ignored. Underpowering and clipping is more dangerous than slight overpowering with a clean signal, because a clipped signal contains DC voltage that overheats voice coils.
For subwoofers, a monoblock amplifier at the driver's RMS rating at the final wired impedance is the standard approach. For component speakers, the 2-channel or 4-channel amplifier's RMS at typical 4 ohm load should match or slightly exceed the speaker's RMS rating. For full-range systems, plan amplifier power for each frequency range (sub, midrange, tweeter) independently to ensure clean headroom in each.
Electrical System Requirements
Every amplifier draws current from your vehicle's electrical system, and high-powered amplifiers draw a lot of it. A 1000W RMS monoblock at 50% efficiency draws roughly 100 amps from a 12V system at full output, more than most factory alternators can sustain alongside the vehicle's other electrical loads. For builds over 1000W RMS total system power, alternator capacity and battery reserve should be part of the system design, not an afterthought.
Big 3 wiring upgrades (replacing the ground cable from battery to chassis, the ground cable from engine block to chassis, and the positive cable from alternator to battery with heavier gauge wire) are the baseline electrical upgrade for any amplified system over 500W. For serious builds, a high-output alternator and supplemental lithium or AGM battery is the right foundation.
Frequently Asked Car Amplifier Questions
How many watts of amplifier power do I need?
Match the amplifier's RMS output at your wired impedance to your subwoofer or speaker's RMS rating. Don't focus on peak power numbers. A 1000W RMS subwoofer needs a monoblock amp delivering 1000W RMS at the driver's final wired impedance. A typical 4-ohm component speaker rated 75W RMS needs about 75-100W RMS per channel from the amplifier. Underpowering and clipping is the most common cause of voice coil failure; match RMS to RMS at the wired impedance.
What's the difference between Class A, Class AB, and Class D amplifiers?
The classes describe the output stage design. Class D is the most efficient (80-90%), with small physical size and low heat. Modern Class D is sonically transparent and appropriate for any application. Class AB is less efficient (50-65%) but uses bias current to eliminate crossover distortion, making it the reference for critical listening. Class A is the audiophile reference, with continuous output transistor operation producing the cleanest signal but with significant heat dissipation. Choose Class D for most builds, Class AB or A for reference SQ builds.
Do I need a monoblock for my subwoofer?
A monoblock amplifier is the standard and best choice for subwoofer power. The full rated output goes into a single channel, optimized for the low impedance and high current demands of subwoofer drivers. A bridged 4-channel amplifier can power a sub if the channel count is constrained, but a dedicated monoblock is the right approach when system topology allows.
Is a 4-channel amplifier enough for a full car audio system?
Depends on the system topology. For a system with front speakers and a subwoofer, a 4-channel amp can power the front speakers on two channels and bridge the other two channels to power the sub. This works for entry to mid-tier builds. For SQ-focused builds with rear speakers, an active crossover, or higher-power requirements, a 4-channel amp paired with a dedicated monoblock is the better approach.
What's a DSP amplifier and do I need one?
A DSP amplifier integrates digital signal processing (crossovers, EQ, time alignment, level control) with the amplifier in a single unit. The DSP gives you precise control over the audio signal before it reaches the speakers, which is essential for active crossover builds, OEM integration projects (where you keep the factory head unit), and competition-level sound quality setups. If you're building a system that needs more than basic passive crossovers, a DSP amplifier or a dedicated DSP processor is worth serious consideration.
Are these new amps with manufacturer warranty?
Yes. Every amplifier in this collection is brand new, sold by an authorized dealer, and carries the full manufacturer warranty. Demo and display units are clearly labeled as such on the product page.
