Class AB car amplifiers across monoblock, 2-channel, 4-channel, and 6-channel configurations from $159 to $39,999.99. The working topology for SQ-focused builds.
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Every amplifier is brand new with the full manufacturer warranty.
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Send us your subwoofer or speaker specs. We'll recommend the right amplifier at the right impedance before you buy.
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Decision Shortcut
Curated picks matched to common build goals
Best Entry Class AB
US Acoustics
4-channel 4x50W Class AB at $159.99. The accessible entry into Class AB amplification.
$ 159.99
View DetailsBest SQ Mid-Tier
US Acoustics
6-channel 6x150W Class AB at $695. The practical 6-channel for active 3-way builds at an accessible price tier.
$ 695.00
View DetailsBest US-Built Audiophile
Tru Technology
US-built reference Class AB 2-channel at $2,399.99. The audiophile front-stage choice with no topology compromise.
$ 2,399.99
View DetailsBest Audiophile Monoblock
Tru Technology
Class AB monoblock at $1,999.99. The reference Class AB sub-channel amp at the practical audiophile tier.
$ 1,999.99
View DetailsBest Reference 2-Channel
Audio Wave
Class AB 2-channel at $7,999.99 on sale from $8,999.99. The audiophile reference for dedicated front-stage builds.
$ 7,999.99 $ 8,999.99
View DetailsBest Reference Flagship
Audio Wave
Dual Mono Class AB at $39,999.99. The absolute top of car audio amplification across any topology.
$ 39,999.99
View Details
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Class AB amplifier topology uses two transistor output stages handing off between the positive and negative halves of the audio signal, with bias current keeping both stages partially conducting at all times. This eliminates the crossover distortion that occurs in pure Class B designs while preserving the efficiency benefits of switching the active transistor based on signal polarity.
The result is amplification with audibly smoother high-frequency reproduction than Class D (which has switching artifacts that can subtly color the upper frequencies) and significantly better efficiency than Class A (which conducts continuously regardless of signal). For car audio specifically, this combination matters because the install environment penalizes both heat output (Class A's problem) and electrical efficiency (Class A's other problem) more than it penalizes the marginal SQ difference between Class AB and pure Class A.
The practical truth: Class AB delivers about 90% of Class A's sonic character at about 40% of the heat output and a substantial fraction of the cost. For SQ-focused builds where amplifier topology matters but the buyer doesn't want to deal with Class A's install complications (high-output alternator, AGM battery upgrade, "Big Three" wiring, dedicated cooling), Class AB is the architecturally correct choice.
Reference SQ builds where Class A is impractical: If you want audiophile amplification quality but your install environment can't accommodate Class A's continuous current draw and thermal load, Class AB delivers most of the sonic benefit without the install penalty. The Audio Wave Aspire Pro USA and Audio Wave CR 401 Dual Mono are reference-tier Class AB amps that compete sonically with Class A at significantly lower install complexity.
Multi-amp builds with consistent topology: Running multiple Class AB amplifiers across the front stage, rear, and subwoofer signal chain gives you consistent sonic character across the entire system. The Tru Technology Tungsten and Tungsten Grande lineups offer Class AB at monoblock, 2-channel, and 4-channel, enabling matched-topology multi-amp builds.
SQ-focused full-range speaker amplification: Class AB's smoother high-frequency reproduction matters most on the speakers that reproduce the critical 80 Hz to 20 kHz range. Class AB on front-stage components plus Class D on subwoofer duty is a common SQ-focused hybrid approach.
Competition SQ systems: Class AB remains the working tier for sound-quality competition builds where the absolute reference (Class A) isn't practical but Class D's switching artifacts are audible. Most IASCA and MECA top-tier builds run Class AB or Class A on the front stage.
US Acoustics Lisa (4-channel Class AB, 4x50W, $159.99): The accessible entry into 4-channel Class AB. Right for upgrading factory speakers with proper amplification at a daily-driver price point.
US Acoustics Wendy (2-channel Class AB, 2x75W, $159.99): The accessible 2-channel option for dedicated front-stage amplification.
US Acoustics Andrea (2-channel Class AB, 2x150W, $289.99): Higher per-channel power for higher-output component speakers.
US Acoustics Barbara Ann (4-channel Class AB, 4x100W, $399.99): The mid-power 4-channel entry, handles most aftermarket component sets cleanly.
Crescendo REVOLUTION 3A4 (4-channel, $499.00): Crescendo's accessible 4-channel for SQ-focused builds.
US Acoustics Lanna (6-channel Class AB, 6x150W, $695): The practical 6-channel for active 3-way builds at a price point where the architecture becomes accessible.
Crescendo REVOLUTION 5A1 (monoblock, $749.99): Class AB monoblock for SQ-focused subwoofer duty (rare in monoblock territory; most monoblocks are Class D).
Crescendo REVOLUTION 5A4 (4-channel, $779.99): Mid-tier 4-channel from Crescendo with strong power-to-price.
Tru Technology Tungsten 2-Channel (TS-2 HV v2.5, $1,399.99): US-built Class AB at the audiophile tier with no compromise on circuit topology.
Tru Technology Tungsten 4-Channel (TS-4 HV v2.5, $1,399.99): Matched 4-channel companion to the Tungsten 2-channel.
Crescendo REVOLUTION 7A4 (4-channel, $1,699.99): Crescendo's high-end 4-channel for SQ builds requiring more power headroom.
Tru Technology Tungsten Grande Monoblock (TG-RS 1.4, $1,999.99): The reference Class AB monoblock at the practical audiophile tier.
Tru Technology Tungsten Grande 4-Channel (TG-RS4 HV v2, $2,399.99): Reference Class AB 4-channel for SQ-focused full-system builds.
Tru Technology Tungsten Grande 2-Channel (TG-RS2 HV v2, $2,399.99): Reference Class AB 2-channel for dedicated front-stage builds.
Audio Wave Active 250 (full-range monoblock, $2,499.99): Class AB full-range monoblock for reference single-driver builds.
Audio Wave Excel 2-Channel ($2,600): Audio Wave's audiophile 2-channel at the practical reference tier.
Audio Wave Excel Monoblock (full-range, $3,099.99): The full-range Class AB monoblock companion to the Excel 2-channel.
Audio Wave Aspire Pro USA (2-channel, $7,999.99 on sale): The audiophile reference 2-channel currently on sale from $8,999.99.
Audio Wave Aspire Pro USA Monoblock ($8,999.99): The reference Class AB monoblock for matched-topology audiophile builds.
Audio Wave Aspire Pro 6-Channel (previous demo, $21,999.99): The only Class AB 6-channel option at this caliber. Demo unit on closeout from $29,999.99, last one available.
Audio Wave CR 401 Dual Mono Class AB ($39,999.99): The absolute top of car audio amplification. Dual mono Class AB architecture represents the reference flagship tier for serious audiophile builds.
Class AB uses linear amplification with continuous bias current to eliminate crossover distortion, producing smoother high-frequency reproduction at the cost of efficiency (50-60%). Class D uses switching topology for high efficiency (90%+) and compact chassis sizes but introduces switching artifacts that can subtly color the upper frequencies. For SQ-focused front-stage amplification where the midrange and high-frequency reproduction matter most, Class AB is the preferred choice. For subwoofer duty where the frequency band is below the audibility threshold for switching artifacts, Class D is the practical choice.
Class A operates with continuous current draw across the entire signal, eliminating crossover distortion completely at the cost of severe efficiency penalty (20-25%) and significant heat output. Class AB approaches Class A's sonic character through continuous bias but allows the inactive transistor stage to draw less current, dramatically improving efficiency. Class AB delivers about 90% of Class A's sonic benefit at significantly better efficiency and chassis manageability. For most car audio buyers who want audiophile amplification without Class A's install complications, Class AB is the architecturally correct choice.
Match the amplifier's RMS power per channel to your speakers' RMS rating, ideally at 75 to 150% of the speaker's RMS. For most aftermarket components rated 75-100W RMS, 75-150W per channel is well-matched. For higher-power components or audiophile-tier drivers, 150-250W per channel enters the right territory.
More than Class D, less than Class A. Class AB's 50-60% efficiency means roughly 40-50% of power draw becomes heat. The chassis sizes are larger than Class D equivalents to handle the heat dissipation, but no electrical system upgrades are typically required (unlike Class A). Standard car audio install practices with adequate ventilation handle Class AB amps without complications.
Yes, most 2-channel and 4-channel Class AB amps support bridging. For dedicated subwoofer duty, a purpose-built Class AB monoblock (Tru Technology Tungsten Grande Monoblock, Audio Wave Excel Monoblock, Crescendo REVOLUTION 5A1) typically delivers better results than a bridged 2-channel or 4-channel because the monoblock's circuit topology is optimized for high-current low-impedance loads.
Yes for all SKUs except the Audio Wave Aspire Pro 6-Channel, which is a previous demo unit at closeout pricing. The remaining 21 SKUs in this collection are brand new, sold by an authorized dealer, and carry the full manufacturer warranty. We handle warranty claims directly with the brand.
Yes. Send us your speaker specs (RMS power, impedance) and your build configuration. We'll recommend the right Class AB amp for your specific build. Pre-purchase consultation is free.
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Subwoofers That Pair Well
These subwoofers match the power and impedance characteristics of the amplifiers in this collection. Pick the driver, match the wiring, get a system that performs as designed.
