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Find powerful 4 channel amps for name brand manufacturers such as Kicker, JVC, Pioneer and more. Four channel amplifiers allow you to have more installation options.
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4-Channel Amplifiers

800W RMS PA D Series Class-D 4-Channel Car Amplifier

• 125 Watts RMS x 4 @ 4 ohms
• 200 Watts RMS x 4 @ 2 ohms
• 400 Watts RMS x 2 @ 4 ohms, Bridged
• 4, 3 and 2 Channel Operation
• CEA-2006 Compliant
• Frequency Response: 20 - 20,000 Hz
• Selectable crossover modes: LPF / FULL / HPF , with 10x Multiplier
• Dimensions: 6-3/4" W x 10-15/16" L x 1-13/16" H

Save 25% on a 4 Gauge Amp Kit with Purchase!

$229.99

IN STOCK

600W 4 Channel Class AB Car or Marine Ready Amplifier

• 4 ohms: 60 watts x 4 chan.
• 2 ohms: 70 watts x 4 chan.
• Rear Channel Bridged, 4 ohms: 160 watts x 1 chan.
• CEA-2006 Compliant Amplifier
• OTL Output Transformerless Circuit Pulse Power Supply
• 4/3 or 2 channel operation
• Speaker-level (high-level) inputs
• Gold plated speaker and power terminals

25% Off of XKIT84 OFC Amplifier Install Kit with Purchase!

$129.95

IN STOCK

Micro-V Series 400W RMS 4-Channel Bridgeable Micro Class D Compact Car Amplifier (MVPA.4)

• The size of a postcard with 400 Watts True RMS Output!
• • MVP Series 4-Channel Micro Class D Amplifier
• 50W x 4-Chan. @ 4 ohms
• 100W x 4-Chan. @ 2 ohms
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 8 Gauge Power and Ground Inputs
• Extremely Small Footprint!

FREE Sound Dampening Kit with Your NVX Amplifier Purchase!

$149.99

IN STOCK

1000W Max 4-Channel Class A/B PDX Series Car Amplifier

Power One Series 4-Channel Class A/B Car Amplifier • 1000W Max • 500W x 2-Chan @ 1 Ohm • SEPP Analog Amplifier • Variable Bass Boost • Speaker-Level Inputs • Preamp RCA Outputs • 3-Way System Protection Circuitry

50% Off of XKIT84 OFC Amplifier Install Kit with Purchase!

$59.99

IN STOCK

800W RMS 4-Channel Onyx Series Class SQ Full-Range Bridgeable Power Amplifier

• 100 Watts RMS x 4 @ 4 ohms
• 200 Watts RMS x 4 @ 2 ohms
• 400 Watts RMS x 2 @ 4 ohm, Bridged
• Total Peak Power: 1600 Watts
• 2-Ohm Stable operation, bridgeable to 4-ohms
• Variable Bass Boost (Bass EQ, Ch 3 & 4 only): 0 - +9 dB at 45Hz
• 16 AWG speaker output connections
• Dimensions: 14.17" L x 9.45" W x 2.23" H

40% Off on 4-Channel RCA Cables w/ purchase!

$89.99

IN STOCK

True 800W RMS, Full Range Class D 4-Channel Amplifier (JAD-800.4)

• 4 ohms: 125 watts x 4-Chan.
• 2 ohms: 200 watts x 4-Chan.
• Bridged, 4 ohms: 400 x 2 chan.
• Pulse Width Modulated MOSFET Power Supply
• 4/3/2 Channel Operation

FREE Sound Dampening Kit with Your NVX Amplifier Purchase!

$199.99

IN STOCK

Single DIN Hi-Power Bluetooth In-Dash CD/AM/FM/SiriusXM Ready Car Stereo with 160W RMS (CEA Rated Power) built-in 4-channel Amplifier!

• In-Dash Car Stereo with built-in 4-channel Amplifier
• Built-In Bluetooth with NFC
• Intelligent Mega Bass
• 10-Band Equalizer
• 3 Sets of 5V Preamp Outputs
• 100W x 4 Chan. MAX, 40W x 4 Chan. RMS

Free SiriusXM Tuner After Rebate + 3 Months Free Service

Free Car Specific Install Dash Kit & Harness

$229.99

IN STOCK

300 Watts Punch Series Boosted Rail Compact 4-Channel Amplifier

• RMS 75 x 1 @ 4 ohms
• Features Rockford Fosgate's Class-BR Topology
• CEA-2006 Compliant
• Ultra Compact Chassis
• Boosted Rail Design
• Dimensions: 6.75"L x 4.25"W x 1.53"H

Save 20% on an RF Amp Kit and get an Extended Warranty!

$149.99

IN STOCK

Belva 600W RMS Full Range Class-AB 4-Channel Amplifier

• 1 Pair of Preamp Outputs
• Variable low-pass filter (50-250 Hz, 12 dB/octave)
• Variable high-pass filter (50-250 Hz, 12 dB/octave)
• Dimensions: 311.15mmW x 203.20mmD x 57.15mmH

$149.99

IN STOCK

300W XC Series Micro 4-Channel Class-D Compact Design Car Amplifier

• 50W x 4-Chan. @ 4 ohms
• 75W x 4-Chan. @ 2 ohms
• 3-Way System Protection
• 4-Channel Operation
• 8 Gauge Power and Ground Inputs
• Micro Size Amplifier for Maximizing Space Saving Applications

Save 35% on an 8 Gauge Amp Kit with Purchase!

$89.00

IN STOCK

1600W 4-Channel WCC Series Full Range Amplifier (Same as MB Quart OA800.4)

• 100W x 4-Chan. @ 4 ohms
• 200W x 4-Chan. @ 2 ohms
• 400W x 2 Chan. @ 4 ohms
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• FLUID-FETS Circuit for Smooth Sound Quality

Get 20% of a 7-Band Graphic Equalizer!

$99.99

IN STOCK

List price $489.97: PZX Series 1000W Monoblock & 900W 4-Channel Class AB Amplifiers with 1/0 + 4 Gauge Dual Amplifier Power Kit

• Total Peak Power: 1900 Watts
• SEPP (Single Ended Push Pull) A/B Class Amplifier Designs
• Wired remote bass level control included
• Variable subsonic filter: 10 - 40 Hz
• Variable Bass Boost and Full-Range Crossovers

$209.95

IN STOCK

Only 3 Left!

600W Class FD 4-Channel GM Digital Series Amplifier

• 100W x 4-Chan. @ 4 ohms
• 150W x 4-Chan. @ 2 ohms
• 125W x 4-Chan. @ 1 ohm
• 3-Way System Protection
• 4/3/2 Channel Operation
• 4 Gauge Power and Ground Inputs
• High Power Capability with Small Size

Save 25% on a 4 Gauge Amp Kit with Purchase!

$139.99

IN STOCK

640 Watt 4 Channel Brutus Series Class AB Amplifier

• RMS Power: 80W x 4 @ 4 ohms, 160W x 2 @ 2 ohms
• Total Peak Power: 640W
• Variable High and Low Pass Filters
• Dimensions: 9.8" W x 14.7" L x 2.4" H

25% Off of XKIT84 OFC Amplifier Install Kit with Purchase!

$129.99

IN STOCK

1200W 4 Channel Hercules Series Amplifier

• 75 Watts RMS x 4 @ 4 ohms
• 150 Watts RMS x 4 @ 2 ohms
• 600 Watts RMS x 2 @ Bridged
• Twin Turbo Coil PS Pulse Width Modulated MOSFET power supply
• Ultra-Fi output devices

Save 50% on an OFC Amplifier Installation Kit with Purchase!

$179.99

IN STOCK

1000 Watt 4 Channel Zeus Series Class AB Amplifier

• Max Power: 125W x 4 @ 4 ohms, 250W x 4 @ 2 ohms
• Total Peak Power: 2000W
• Variable Low and High Pass Filters
• Dimensions: 10" W x 15.7" L x 2.4" H

Save 25% on an 8 Gauge Amp Kit with Purchase!

$119.97

IN STOCK

600 Watt 4 Channel Zeus Series Class AB Amplifier

• Max Power: 250W x 4 @ 4 ohms, 500W x 4 @ 2 ohms
• Total Peak Power: 2000W
• Variable Low and High Pass Filters
• Dimensions: 10" W x 12.6" L x 2.4" H

Save 25% on an 8 Gauge Amp Kit with Purchase!

$94.99

IN STOCK

List price $429.89: 6-1/2" 2-Way GTO Series Coaxial Speakers + 4-Channel GM Series Bridgeable Class AB Car Amplifier

• 60W x 4 @ 2 ohms
• Mylar / Titanium Composite Dome Tweeter
• Mounting Depth: 2-1/16"
• Plus One Cone Material
• CEA-2006 Compliant
• Dimensions: 12-1/2"W x 8-1/2"L x 2-3/8"H

$192.75

IN STOCK

1000W 4-Channel Black Ice Series Class AB Car Amplifier

• RMS Power: 80W x 4 @ 4 ohms, 125W x 4 @ 2 ohms
• Total Peak Power: 1000W
• Variable High and Low Level Crossovers
• 3-Way System Protection

Save 25% on an 8 Gauge Amp Kit with Purchase!

$74.99

IN STOCK

2000W 4-Channel Ground Pounder Series A/B Class Amplifier

• RMS Power: 250W x 4 @ 4 ohms, 500W x 4 @ 2 ohms, 1000 x 2 @ 4 ohms Mono Bridged
• Total Peak Power: 2000W
• Variable Bass Boost
• Speaker Level Inputs
• 9.05"W x 13.93"L x 2.29"H

Save 25% on a 4 Gauge Amp Kit with Purchase!

$89.99

IN STOCK

400W 4-Channel GM Digital Series Class FD Amplifier

• RMS Power: 45W x 4 @ 4 ohms, 45W x 4 @ 2 ohms
• Total Peak Power: 400W
• CEA-2006 Compliant
• Dimensions: 7-1/8" W x 2-1/2" D x 1-1/2" H

$89.99

IN STOCK

OA800.4 800W RMS 4-Channel Full-Range Power Amplifier + ZK1-169 6 x 9" Z-Line Series 2-Way Coaxial Car Speakers

• 4 ohms: 100 watts x 4 chan.
• 1" (30mm) ceramic Coated Titanium Dome Tweeter
• Mica-filled PP Cone Mated to UV Butyl Surround
• 12bd/Octave Crossovers
• 4 Ohms Impedance
• Sensitivity: 89dB
• Variable Bass Boost (Bass EQ, Ch 3 & 4 only): 0 - +9 dB at 45Hz
• 16 AWG speaker output connections
• Dimensions: 14.17" L x 9.45" W x 2.23" H

$371.97

IN STOCK

Only 2 Left!

900W Phantom Series Class D Full Range 4-Channel Amplifier

• RMS Power: 145 watts x 4 @ 4 ohms, 225 watts x 4 @ 2 ohms
• 450W RMS x 2 Channel @ 4 ohms Bridged
• Tri-Mode Capable
• 3-Way System Protection
• Variable Low-Pass Crossover
• Variable High-Pass Crossover
• Band-Pass Crossovers
• Input Source Selector

Save 25% on a 4 Gauge Amp Kit with Purchase!

$174.99

IN STOCK

Universal Class D 4-Channel Head Unit Power Pack for Use with all Aftermarket & Factory Receivers

• RMS Power: 45W x 4-Chan. @ 4 Ohm
• Adjustable Gain Switch
• Plug-and-Play
• CEA-2006 Compliant

$139.99

IN STOCK

400W 4-Channel Gothic Series Class AB Car Amplifier

• 30 Watts RMS x 4 @ 4 ohms
• 40 Watts RMS x 4 @ 2 ohms
• 90 Watts RMS x 2 @ 4 ohms, Bridged
• Total Peak Power: 400 Watts
• 4, 3 or 2 channel operation
• 3-way protection circuitry (thermal, overload, and speaker short protection)
• Frequency Response: 15 - 20,000 Hz
• Signal to Noise Ration: 100dB

Save 25% on an 8 Gauge Amp Kit with Purchase!

$49.99

IN STOCK

900W 4-Channel PZX Powerzone Series Class AB Car Amplifier

• 115 Watts Max x 4 @ 4 ohms
• 225 Watts Max x 4 @ 2 ohms
• 450 Watts Max x 2 @ 4 ohms, Bridged
• Total Peak Power: 900 Watts
• Speaker-level (high-level) inputs
• Variable Bass Boost: 0 to +9 dB bass boost at 45 Hz
• 4, 3 or 2 channel operation
• Selectable crossover modes: FULL / LPF / HPF

$69.99

IN STOCK

Only 3 Left!

1000W Max 4-Channel ATA Series Class-AB Car Amplifier

• Max Power: 125W x 4 @ 4 ohms, 250W x 4 @ 2 ohms
• Total Peak Power: 1000W
• Pulse Width Modulated MOSFET power supply
• LED power (green) and protect (red) indicators
• 4/3/2 channel operation
• Preamp RCA outputs to daisy chain multiple amps

Save 25% on an 4 Gauge Amp Kit with Purchase!

$64.99

IN STOCK

400W 4-Channel Class D Prime Series Full Range Amplifier

• 75W x 4-Chan. @ 4 ohms
• 100W x 4-Chan. @ 2 ohms
• 200W x 2 Chan. @ 4 ohms Bridged
• Variable Bass Boost
• Variable High-Pass Crossover
• CEA-2006 Compliant

40% Off on 4-Channel RCA Cables w/ purchase!

$164.99

IN STOCK

1000W 4-Channel Power One Series Class AB Car Amplifier

• 1000W Max
• 250W x 4-Chan @ 2 Ohm, 125W x 4-Chan @ 4 Ohm
• SEPP Analog Amplifier
• Variable Bass Boost
• Speaker-Level Inputs
• Preamp RCA Outputs
• 3-Way System Protection Circuitry

Save 25% on a 4 Gauge Amp Kit with Purchase!

$71.97

IN STOCK

600W Class D 4-Channel Compact Digital Car/ATV/Marine Certified Amplifier

• RMS: 50W x 4 @ 4 ohms, 75W x 4 @ 2 ohms &bull, 150W x 2 Bridged @ 4 Ohms ; Total Peak Power: 600W
• CEA-2006 Compliant/Preamp Outputs/LPF
• Variable Bass Boost: 0 to +12 dB bass boost at 50 Hz
• Lo-Level (RCA) and Speaker-level (high-level) inputs
• Dimensions: 6-1/2"W x 4"D x 1-13/16"H

Save 20% on a 10 AWG Amplifier Power Installation Kit!

$127.99

IN STOCK

800W Anarchy Series 4-Channel Class A/B Power Amplifier

• RMS: 100W x 4 @ 4 ohms, 300W x 4 @ 2 ohms
• Total Peak Power: 1200W
• Pulse Width Modulated MOSFET Power Supply
• Variable Bass Boost
• Heavy Duty Black Anodized Heatsink For Heat Dissipation
• Dimensions: 10.66"W x 10"L x 2.41"H

$69.97

IN STOCK

300W 4-Channel Class AB Prime Series Full Range Amplifier

• 50W x 4-Chan. @ 4 ohms
• 75W x 4-Chan. @ 2 ohms
• 150W x 2 Chan. @ 4 ohms Bridged
• Variable Bass Boost
• Variable High-Pass Crossover
• CEA-2006 Compliant
• Soft Start Turn-On

Save 25% on an 8 Gauge Amp Kit with Purchase!

$119.99

IN STOCK

900W Max 4-Channel Class AB Performance Series Car Amplifier

• RMS Power: 70W x 4 @ 4 ohms, 100W x 4 @ 2 ohms
• Total Peak Power: 900W
• CEA-2006 Compliant
• Dimensions: 13-3/16" W x 7-9/16" D x 2-3/16" H

Save 25% on a 4 Gauge Amp Kit with Purchase!

$134.99

IN STOCK

Only 3 Left!

2400W Anarchy Series 4-Channel Class AB MOSFET Power Amplifier with Remote Level Control

• RMS: 2 ohms: 420 watts x 4 chan.
• 2400W Max.
• Switchable Phase Shift
• Input Sensitivity Selector
• Remote Subwoofer Control
• Heavy-Duty Screw Terminals
• Chrome-Plated Connections
• Illuminated Logo

Save 25% on a 4 Gauge Amp Kit with Purchase!

$99.95

IN STOCK

1600W 4-Channel ARMOR Series Class A/B Car Amplifier

• 4 ohms: 160 watts x 4 chan.
• 2 ohms: 400 watts x 4 chan.
• Bridged, 4 ohms: 800 watts x 2 chan.
• Pulse Width Modulated MOSFET Power Supply

Save 25% on an 8 Gauge Amp Kit with Purchase!

$73.97

IN STOCK

2000W 4-Channel RAZOR Series Full Range Class D Car Amplifier

• 4 ohms: 160 watts x 4-Chan.
• 2 ohms: 250 watts x 4-Chan.
• Bridged, 4 ohms: 500 x 2 chan.
• Max power output: 2000 watts x 2 chan.

Save 25% on a 4 Gauge Amp Kit with Purchase!

$104.99

IN STOCK

400W 4 Channel Class D Compact Digital Car Marine/ATV Amplifier

• RMS Power: 45W x 4 @ 4 ohms
• Total Peak Power: 400W
• CEA-2006 Compliant
• Dimensions: 5-1/2" W x 3-9/16" D x 1-5/16" H

$93.99

IN STOCK

List price $709.89: Hifonics BRX316.4 4 Channel Brutus Series Class AB Amplifier + 6x9" 3-Way Grand Touring GTO Series Coaxial Speakers

• 80W x 4 @ 2 ohms
• Mylar / Titanium Hybrid Dome Tweeter
• Mounting Depth: 3" • Plus One Woofer Cone
• 2 Ohms Impedance
• Sensitivity: 94dB
• Total Peak Power: 320W
• Variable High and Low Pass Filters
• Dimensions: 9.8" W x 11" L x 2.4" H

$237.87

IN STOCK

840W Max, FX Series 4-Channel Amplifier

• 840W Max, FX Series 4-Channel Amplifier • 4 ohms: 80 watts x 4 chan • 2 ohms: 95 watts x 4 chan • Bridged, @ 4 ohms: 190 watts x 2 chan • S/N Ratio: 98dB • THD: 0.02%

Save 35% on a 4 Gauge Amp Kit with Purchase!

$63.99

IN STOCK

Plug and Play Head Unit Power Pack for Use w/ 2005-Up Alpine Head Units with a Black Power Harness

• Power Pack 4-Channel Class D for Select Alpine In-Dash Receivers
• 45W x 4 Chan. @ 4 Ohm
• Adjustable Gain Switch
• Plug-and-Play
• CEA-2006 Compliant

$112.97

IN STOCK

360W RMS 4-Channel GM Series Bridgeable Class AB Car Amplifier

• RMS: 60W x 4 @ 4 ohms, 90W x 4 @ 2 ohms, 180W x 2 @ 4 ohm
• Total Peak Power: 760W
• CEA-2006 Compliant
• Dimensions: 13-3/4"W x 8-1/2"L x 2-1/2"H

Save 25% on a 4 Gauge Amp Kit with Purchase!

$119.99

IN STOCK

2000W Max 4-Channel Class AB Car Amplifier

• Max Power: 250W x 4 @ 4 ohms, 500W x 2 @ 2 ohms
• Total Peak Power: 2000W
• Adjustable 12dB Crossovers
• Dimensions: 9.05" W x 12.6" L x 2.29" H

Save 25% on a 4 Gauge Amp Kit with Purchase!

$78.97

IN STOCK

1600W Black Ice Series 4 Channel Class AB Car Amplifier

• RMS Power: 130W x 4 @ 4 ohms, 200W x 4 @ 2 ohms, 400W x 2 @ 4 ohms Bridged
• Total Peak Power: 1600W
• Variable 12dB High, Low, & Subsonic Crossovers
• Dimensions: 8.6"W x 15.50"L x 2.3"H

Save 25% on a 4 Gauge Amp Kit with Purchase!

$104.99

IN STOCK

2600W 4-Channel Phantom Series Full Range Class AB Amplifier

• RMS: 325W x 4 @ 4 ohms
• Total Peak Power: 2600W
• Gold-plated RCA low level and high level inputs
• 3-way protection circuitry (thermal, overload, and speaker short protection)
• Wired remote bass level control included
• 10.31" W x 17.00" L x 2.25" H

Save 25% on a 4 Gauge Amp Kit with Purchase!

$117.97

IN STOCK

Only 1 Left!

1600W Anarchy Series 4-Channel Class AB MOSFET Power Amplifier with Remote Level Control

• RMS: 300W x 4 @ 2 ohms
• 1600W Max.
• Switchable Phase Shift
• Input Sensitivity Selector
• Remote Subwoofer Control
• Heavy-Duty Screw Terminals
• Chrome-Plated Connections
• Illuminated Logo

Save 35% on a 4 Gauge Amp Kit with Purchase!

$84.95

IN STOCK

1000W 4-Channel Discus Series Full Range Car Amplifier

• RMS: 125W x 4 @ 4 ohms, 250W x 4 @ 2 ohms, Bridged: 500W x 2 @ 4 ohm
• Variable Low-Pass & High-Pass Filters
• Bass Boost: 0 ~ 12 dB
• Focused mass aluminum heat sinks
• 9.00" W x 15.4" L x 2.20" H

Save 50% on a 4 Gauge Amp Kit with Purchase!

$114.95

IN STOCK

2100W 4-Channel Street Machine Series Class AB Amplifier

• RMS: 275W x 4 @ 4 ohms, 525W x 4 @ 2 ohms, 1050W x 2 @ 4 ohms Bridged
• Pulse Width Modulated MOSFET power supply
•Nickel plated brass connections
• Built-in Variable Low-Pass and Subsonic Filter
• Heavy duty aluminum alloy heat-sink for extreme heat dissipation

$83.97

IN STOCK

1800W 4-Channel Powerzone Series Class AB Car Amplifier

• RMS Power: 225W x 4 @ 4 ohms, 450W x 4 @ 2 ohms, 900W x 2 @ 4 ohms Bridged
• Total Peak Power: 1800W
• Rugged MOSFET Pulse Width Modulation Power Supply

$84.99

IN STOCK

1200W 4-Channel Powerzone Series Class A/B Car Amplifier

• 150 Watts x 4 @ 4 ohms
• 300 Watts x 4 @ 2 ohms
• 6000 Watts x 2 @ 4 ohms, Bridged
• Speaker-level (high-level) inputs
• 4, 3 or 2 channel operation
• Signal to Noise Ration: >90 dB
• Variable Bass Boost: 0 to +9 dB bass boost at 45 Hz
• Dimensions: 9.29" L x 11.02" W x 2.17" H

50% off an 8 Gauge Amp Kit with Select Amplifiers Purchase!

$80.97

IN STOCK

682.11cf 6" x 8" / 5" x 7" 2-Way Kappa Series Coaxial Car Speakers + KX400.4 400W KX Series 4-ch Amp + XKIT42 2-ch True Spec 4G Amp Install Kit

• Speakers: RMS Power: 100W
• 2-Way Coaxial Design
• 50W x 4-Chan. @ 4 ohms
• 100W x 4-Chan. @ 2 ohms
• 4 Gauge 2-Channel X-Series Complete Amplifier Installation Kit

$476.00

IN STOCK

Only 3 Left!

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Related Categories

Amplifier Wiring Kits
Get all the cables, wires, and hardware you need to install your new car audio amplifier with one of these power amp kits. Amplifier wiring kits come with your basic power and ground cables, as well as other necessary wires. Select complete amplifier kits will include speaker wire, RCA interconnect cables, and more! To make sure you get the kit that is best designed for your car audio system, scroll down to the bottom of this page for the buying guide.
Capacitors
Car audio capacitors are a great addition to any aftermarket audio system that is in need of a little extra power. Capacitors store a temporary electrical charge that can be released during periods of extra power strain. If a vehicle has dimming headlights when music is played, a capacitor could solve that problem.
Sound Processors
For those who want the most out their car audio system, a quality sound processor is a must. After some slight adjustments, your systems will sound like it has been professionally tuned and optimized. Tune your system to perfection with these crossovers, equalizers, and bass drivers. Click here to learn more about digital sound processors and to find out which type would be best for your car audio system.

4-Channel Amplifiers Information

A 4-channel amplifier is the best way to power a complete set of new car speakers. These amplifiers are designed to power four door speakers, although the right & left channels can usually be bridged to offer a wide range of wiring options. Commonly, the rear channels will be bridged to power a small subwoofer while the front channels are used for the front speakers. Some audiophile installations use these amplifiers to bi-amp a pair of component speakers – in these setups, each tweeter and midwoofer is powered from their own channel. Four channel amplifiers mostly utilize class A/B circuitry for the best possible sound quality, but the last few years have seen a huge rise in the popularity of full-range class D amps. These amplifiers are prized for their compact chassis, and advances in technology have made them sound almost indistinguishable from their A/B counterparts. 4-Channel amplifiers also frequently feature preamp outputs or signal pass-thru, allowing you to provide signal to a subwoofer amp without running another RCA cable to your head unit.