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4-Channel Amplifiers

240W RMS Class A/B 4-Channel Gladiator Series Amplifier
Free Ground Shipping within the 48 states
Gladiator Series 4-Channel Class A/B Car Amplifier • 4 ohms: 60 watts x 4 chan. • 2 ohms: 120 watts x 4 chan. • Bridged, 4 ohms: 240 watts x 2 chan.
$99.99
Shipping: FREE
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  • 4.0
  (4 reviews)
True 800W RMS, Full Range Class D 4-Channel Amplifier (JAD-800.4)
Free Ground Shipping within the 48 states
Class D 4-Channel Amplifier • 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
$239.99
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  • 4.8
  (11 reviews)
400W RMS eXcelon Series 4-Channel Reference XR Stereo Bridgeable Car Power Amplifier (XR4004)
Free Ground Shipping within the 48 states
XR Series 4-Channel Class D Amplifier • 75W x 4 Chan. @ 4 ohms • 100W x 4 Chan. @ 2 ohms • 200W x 2 Chan. @ 4 ohms • 3-Way System Protection • 4/3/2/1 Channel Operation • 4 Gauge Power and Ground Inputs • Extremely Thin Design
$199.99
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900W RMS, Phantom Series Class D Full Range 4-Channel Amplifier (P 900.4)
Free Ground Shipping within the 48 states
Phantom Series Class D Full Range 4-Channel Car Amplifier • 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
$189.99
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  • 5.0
  (10 reviews)
400W RMS 4-Channel Class D Prime Series Amplifier
Free Ground Shipping within the 48 states
Prime Series Full Range Class D 2-Channel Car 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
$159.99
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  • 3.9
  (8 reviews)
300W Prime Series 4-Channel Amplifier
Free Ground Shipping within the 48 states
Prime Series 4-Channel Class A/B Car Amplifier • 50 Watts x 4 Chan. @ 4 Ohms • 75 Watts x 4 Chan. @ 2 Ohms • Selectable Bass Boost • 2-Way System Protection Circuitry • Extruded Aluminum Alloy Convection Heat Sink
$129.99
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  • 4.8
  (25 reviews)
500W 4-Channel Stereo Bridgeable Power Amplifier w/ LPF and HPF
Free Ground Shipping within the 48 states
4-Channel Sport Series Car Amplifier • Class AB • 40W x 4 Chan. @ 4 ohm • 60W x 4 Chan. @ 2 ohm • High-Level Speaker Input • Heavy Duty Aluminum Heatsink • Low-Pass and High-Pass • CEA-2006 Compliant
$104.99
Shipping: FREE
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  • 5.0
  (2 reviews)
400W Max, 4-Channel Gothic Series Car Amplifier
Free Ground Shipping within the 48 states
4-Channel Gothic Series Car Amplifier • 4 ohms: 45 watts x 4 chan. • 2 ohms: 75 watts x 4 chan. • Max power output: 900 watts • MOSFET power supply • 4/3/2 Channel Operation
$59.99
Shipping: FREE
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  • 4.7
  (3 reviews)
400W Max 4-Channel Chaos Exxtreme Series Amplifier (CX-350)
Free Ground Shipping within the 48 states
Chaos Exxtreme 4-Channel Class AB Car Amplifier • 50W x 4 chan. @ 4 ohms • 100W x 4 chan Max • Speaker-level inputs with soft turn-on • Thermal and short circuit protection circuitry
$49.99
Shipping: FREE
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  • 4.4
  (16 reviews)
400W Max, 4-Channel Evolution Series Car Amplifier
Free Ground Shipping within the 48 states
Evolution Series 4-Channel Class AB Car Amplifier • 50W RMS x 4 Channels • MOSFET Power Supply • High/Low Level Inputs • Fixed High/Low Pass Filters • 3-Way System Protection Circuitry
$49.99
Shipping: FREE
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  • 3.3
  (3 reviews)
400W Max, Pro Series 4-Channel Amplifier with Remote Level Control
Free Ground Shipping within the 48 states
Pro Series 4-Channel Car Amplifier • 400W Max • 100W x 4-Chan. @ 2 Ohms • 50W x 4-Chan. @ 4 Ohms • Soft Turn-On Circuit • Remote Turn-On/Off Circuit • Speaker-Level Inputs • LED Power And Protect Indicator
$49.99
Shipping: FREE
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  • 4.4
  (14 reviews)
800W 4-Channel PowerOne Series Car Amplifier
Free Ground Shipping within the 48 states
Power One Series 2-Channel Class A/B Car Amplifier • 4 ohms: 200 watts x 4 chan. • 2 ohms: 400 watts x 4 chan.• Bridged, 4 ohms: 800 watts x 2 chan. • SEPP Class A/B Analog Amplifier
$94.99
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200W RMS 4-Channel DX Series Amplifier (DX2004)
Free Ground Shipping within the 48 states
DX Series 4-Channel Class A/B Car Amplifier • 50 Watts x 4-Channel @ 2 Ohm • 25 Watts x 4-Channel @ 4 Ohm • 100 Watts x 2-Channel @ 4 Ohm • Muting Circuit • 3 Automatic Turn-On Modes • Balanced Differential Inputs
$139.95
Shipping: FREE
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  • 5.0
  (4 reviews)
468W Max, Reference Series Class AB 4-Channel Amplifier (REF475A)
Free Ground Shipping within the 48 states
Reference Series Class AB 4-Channel Amplifier • 75W x 4 chan. @ 4 ohms • 90W x 4 chan. @ 2 ohms • 117W x 4 chan. Max • MOSFET power supply • Gold-plated preamp RCA outputs
$183.53
Shipping: FREE
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  • 4.5
  (19 reviews)
400W RMS 4-Channel DX Series Amplifier (DX4004)
Free Ground Shipping within the 48 states
DX Series 4-Channel Class A/B Car Amplifier • 100 Watts x 4-Channel @ 2 Ohm • 50 Watts x 4-Channel @ 4 Ohm • 200 Watts x 2-Channel @ 4 Ohm • Muting Circuit • 3 Automatic Turn-On Modes • Balanced Differential Inputs
$229.95
Shipping: FREE
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  • 5.0
  (2 reviews)
360W RMS, 4-Channel Class A/B JX Series Full-Range Car Amplifier
Free Ground Shipping within the 48 states
JX Series 4-Channel Amplifier • Class AB • 70W x 4 Chan @ 4 ohm • 90W x 4 Chan @ 2 ohm • Preamp Outputs • High & Low Level Inputs • Adjustable Input Sensitivity • High & Low Pass Filter
$224.95
Shipping: FREE
To the US 48 • other rates
  • 4.7
  (10 reviews)
320W RMS DTX Series Class AB 4-Channel Amplifier
Free Ground Shipping within the 48 states
DTX Series 4-Channel Class D Amplifier • 60W x 4 Chan. @ 4 ohms • 80W x 4 Chan. @ 2 ohms • 4-Way System Protection • 4/3/2/1 Channel Operation • 4 Gauge Power and Ground Inputs • Variable Bass Boost (0-12 dB)
$104.99
Shipping: FREE
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640W 4-Channel Reference Series Bridgeable Power Amplifier (RA6404)
Free Ground Shipping within the 48 states
Reference Series 4-Channel Class SQ Amplifier • 80W x 4 Chan. @ 4 ohms • 160W x 4 Chan. @ 2 ohms • 320W 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
$149.99
Shipping: FREE
To the US 48 • other rates
  • 5.0
  (1 review)
400W Max, 4-Channel Gorilla Series Car Amplifier
Free Ground Shipping within the 48 states
4-Channel Gorilla Series Car Amplifier • 4 ohms: 45 watts x 4 chan. • 2 ohms: 75 watts x 4 chan. • Bridged, 4 ohms: 150 watts x 2 chan. • Pulse Width Modulated MOSFET Power Supply
$63.99
Shipping: FREE
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5-1/4" SPS-510 Type S Speakers + Rockford Fosgate R300-4 4 Channel Amplifier + Kit + Sound Dampening
Free Ground Shipping within the 48 states
5-1/4" Type S Series Car Speakers • 340W Max • 110W RMS • Prime Series 4-Channel Class A/B Car Amplifier • MOSFET Power Supply • CEA-2006 Compliant Amplifier • Amplifier Kit • Sound Dampening Material
$221.92
Shipping: FREE
To the US 48 • other rates
800W RMS 4-Channel Class A/B Black Ice Series Car Amplifier (BK8004)
Free Ground Shipping within the 48 states
4-Channel Class A/B Black Ice Series Car Amplifier • 4 ohms: 130 watts x 4 chan. • 2 ohms: 200 watts x 4 chan. • Bridged, 4 ohms: 400 watts x 2 chan. • SMT(Surface mount technology) Circuity • Band-pass crossovers
$169.99
Shipping: FREE
To the US 48 • other rates
  • 5.0
  (1 review)
320W Max, Sedona Series 4-Channel Amplifier
Free Ground Shipping within the 48 states
Sedona Series 4-Channel Car Amp • 55W x 4-Chan. @ 4 Ohm • 80W x 4-Chan. @ 2 Ohm • MOSFET Power Supply • Variable Bass Boost • Brushed Aluminum Finish • Platinum 4 AWG Power Block
$99.99
Shipping: FREE
To the US 48 • other rates
  • 5.0
  (1 review)
580W Max, Sedona Series 4-Channel Amplifier
Free Ground Shipping within the 48 states
Sedona Series 4-Channel Car Amp • 100W x 4-Chan. @ 4 Ohm • 145W x 4-Chan. @ 2 Ohm • MOSFET Power Supply • Variable Bass Boost • Brushed Aluminum Finish • Platinum 4 AWG Power Block • Tri Mode Capable
$109.99
Shipping: FREE
To the US 48 • other rates
  • 3.7
  (3 reviews)
760W Max Sedona Series 4-Channel Amplifier
Free Ground Shipping within the 48 states
Sedona Series 4-Channel Class A/B Amplifier • 760W Max • 190W x 4-Chan @ 2 Ohms • 120W x 4-Chan @ 4 Ohms • IDI Intelligent Distress Indicator • Tri-Mode Capable • Soft Start Turn-On • Platinum-Plated Terminals
$149.99
Shipping: FREE
To the US 48 • other rates
4-Channel GTO Series Class A/B Car Amplifier
Free Ground Shipping within the 48 states
4-Channel GTO Series Class AB Car Amplifier • 4 ohms: 50 watts x 4 chan. • 2 ohms: 75 watts x 4 chan. • Bridged; 4 ohms: 150 watts x 2 chan. • Max power output: 160 watts x 4 chan.
$199.95
Shipping: FREE
To the US 48 • other rates
440W 4-Channel Reference MYKRO Series Hybrid Class D Full-Range Car Power Amplifier (RM4404)
Free Ground Shipping within the 48 states
Reference MYKRO Series 4-Channel Hybrid Class D Full-Range Car Amplifier • 75W x 4 Chan. @ 4 ohms • 110W x 4 Chan. @ 2 ohms • 220W x 2 Chan. @ 4 ohms • 4-Way System Protection • 4/3/2/1 Channel Operation • 4 Gauge Power and Ground Inputs • FLUID-FETS Circuit for Smooth Sound Quality
$184.99
Shipping: FREE
To the US 48 • other rates
350W RMS 4-Channel ZXM Series Marine Amplifier (ZXM3504)
Free Ground Shipping within the 48 states
ZX Series 4-Channel Class AB Car Amplifier • 60W x 4 chan. @ 4 ohms • 90W x 4 chan. @ 2 ohms • 175W x 2 chan. @ 4 ohms • 350W x 2 chan. Max • Balanced differential inputs
$299.95
Shipping: FREE
To the US 48 • other rates
  • 5.0
  (3 reviews)
320W Max PA Series 4-Channel Amplifier
Free Ground Shipping within the 48 states
PA Series 4-Channel Class AB Car Amplifier • 35W x 4 chan. @ 4 ohms • 50W x 4 chan. @ 2 ohms • 100W x 2 chan. @ 4 ohms • 4/3/2 channel operation • Preamp RCA outputs
$124.99
Shipping: FREE
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  • 4.0
  (1 review)
640W RMS, Power Class Series 4-Channel Amplifier (PC 6404)
Free Ground Shipping within the 48 states
Power Class Series 4-Channel Class A/B Car Amplifier • 640W RMS • Large TO218 MOSFET Transistors • Triple Darlington Audio Output Stages • Close Tolerance Signal Path Components • Extra Low Current Drive Stage
$219.00
Shipping: FREE
To the US 48 • other rates
  • 4.0
  (3 reviews)
480W 4-Channel Reference Series Bridgeable Power Amplifier (RA4804)
Free Ground Shipping within the 48 states
Reference Series 4-Channel Class SQ Amplifier • 60W x 4 Chan. @ 4 ohms • 120W x 4 Chan. @ 2 ohms • 240W x 2 Chan. @ 4 ohms • 3-Way System Protection • 4/3/2/1 Channel Operation • 8 Gauge Power and Ground Inputs • FLUID-FETS Circuit for Smooth Sound Quality
$129.00
Shipping: FREE
To the US 48 • other rates
4-Channel GTO Series Class A/B Car Amplifier
Free Ground Shipping within the 48 states
4-Channel GTO Series Class AB Car Amplifier • 4 ohms: 80 watts x 4 chan. • 2 ohms: 100 watts x 4 chan. • Bridged; 4 ohms: 200 watts x 2 chan. • Max power output: 235 watts x 4 chan.
$299.95
Shipping: FREE
To the US 48 • other rates
340W RMS 4-Channel Class A/B Black Ice Series Car Amplifier (BK3404)
Free Ground Shipping within the 48 states
4-Channel Class A/B Black Ice Series Car Amplifier • 4 ohms: 55 watts x 4 chan. • 2 ohms: 85 watts x 4 chan. • Bridged, 4 ohms: 170 watts x 2 chan. • SMT(Surface mount technology) Circuity • Band-pass crossovers
$119.99
Shipping: FREE
To the US 48 • other rates
4-Channel TD Series Class A/B Car Amplifier
Free Ground Shipping within the 48 states
4-Channel TD Series Class A/B Car Amplifier • 4 ohms: 75 watts x 4 chan. • 2 ohms: 100 watts x 4 chan. • Bridged, 4 Ohms: 200 x 2 chan. • 4/3/2 channel operation
$132.00
Shipping: FREE
To the US 48 • other rates
520W RMS 4-Channel Class A/B Black Ice Series Car Amplifier (BK5204)
Free Ground Shipping within the 48 states
4-Channel Class A/B Black Ice Series Car Amplifier • 4 ohms: 95 watts x 4 chan. • 2 ohms: 130 watts x 4 chan. • Bridged, 4 ohms: 260 watts x 2 chan. • SMT(Surface mount technology) Circuity • Band-pass crossovers
$159.99
Shipping: FREE
To the US 48 • other rates
  • 3.0
  (1 review)
400W RMS Power Class Series 4-Channel Car Amplifier (PC 4004)
Free Ground Shipping within the 48 states
Power Class Series 4-Channel Class A/B Car Amplifier • 400W RMS • Large TO218 MOSFET Transistors • Triple Darlington Audio Output Stages • Close Tolerance Signal Path Components • Extra Low Current Drive Stage
$179.99
Shipping: FREE
To the US 48 • other rates
  • 5.0
  (3 reviews)
360W RMS, 4-Channel Class A/B Road Thunder Amplifier
Free Ground Shipping within the 48 states
Road Thunder Series 4-Channel Class AB Car Amplifier • 90W x 4-Chan @ 2 Ohms • 60W x 4-Chan @ 4 Ohms • Speaker-level (high-level) inputs • Preamp RCA outputs • High/Low-Pass Filters
$169.95
Shipping: FREE
To the US 48 • other rates
2000W Max 4-Channel District Series Car Amplifier
Free Ground Shipping within the 48 states
4-Channel, District Series Car Amplifier • 2 ohms: 750 watts x 4 chan. • Bridged, 4 ohms: 2000 watts x 2 chan. • Max power output: 2000 watts x 2 chan. • Pulse Width Modulated MOSFET power supply
$139.99
Shipping: FREE
To the US 48 • other rates
800W RMS Stroker Series 4-Channel Class A/B Car Amplifier (STKR8004, S800.4, S8004)
Free Ground Shipping within the 48 states
Stroker Series 4-Channel Class AB Car Amplifier • 4 ohms: 100 watts x 4 chan. • 2 ohms: 200 watts x 4 chan. • CEA-2006 compliant amplifier • Clip indication LED's for simple amplifier system set-up
$329.99
Shipping: FREE
To the US 48 • other rates
400W RMS, 4-Channel Class A/B Car Amplifier
Free Ground Shipping within the 48 states
Realm by Scosche 4-Channel Class A/B Car Amplifier • Multi-Color LED Protection • High-Level Speaker Inputs • Preamp RCA Outputs • Variable Low/High-Pass Crossovers • Discrete Plug Style Terminals • CEA-2006 Compliant
$159.99
Shipping: FREE
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400W RMS, 4-Channel Class A/B High Fidelity Q Series Car Amplifier
Free Ground Shipping within the 48 states
Q Series 4-Channel Class A/B Car Amplifier • 200W x 2 Channel @ 4 Ohms Bridged • Fixed Bass Boost • Variable Low Pass Filters • Optically Isolate MOSFET Power Supply • 3 Way System Protection Circuitry
$395.99
Shipping: FREE
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  • 5.0
  (1 review)
MX Marine Series 4-Channel Amplifier (07MX3504, 07MX350.4, MX3504)
Free Ground Shipping within the 48 states
MX Marine Series 4-Channel Class AB Marine Amplifier • 60W x 4 chan. @ 4 ohms • 90W x 4 chan. @ 2 ohms • Easily accessible, top-mounted switches, LEDs, and dial controls for the crossover, boost, and gain • Rubber covered RCA inputs, silicone shielded fuses, and corrosion protecting coat
$239.96
Shipping: FREE
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  • 4.0
  (1 review)
300W RMS XC Series Micro 4-Channel Class D Compact Design Car Amplifier
Free Ground Shipping within the 48 states
XC Series 4-Channel Class D 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
$109.95
Shipping: FREE
To the US 48 • other rates
600W RMS 4-Channel Stealth Series Full-Range Class D Car Power Amplifier (Stealth5004)
Free Ground Shipping within the 48 states
Stealth Series 4-Channel Class D Amplifier • 90W x 4 Chan. @ 4 ohms • 150W x 4 Chan. @ 2 ohms • 3-Way System Protection • 4/3/2/1 Channel Operation • 4 Gauge Power and Ground Inputs • 12dB Vega Bass Boost
$299.99
Shipping: FREE
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520W RMS 4-Channel iON Series Class D Full-Range Digital Stereo Bridgeable Amplifier (i5204)
Free Ground Shipping within the 48 states
iON Series 4-Channel Class D Amplifier • 100W x 4 Chan. @ 4 ohms • 130W x 4 Chan. @ 2 ohms • 260W x 2 Chan. @ 4 ohms • 3-Way System Protection • 4/3/2/1 Channel Operation • 4 Gauge Power and Ground Inputs • Surface Mount Technology (SMT)
$139.95
Shipping: FREE
To the US 48 • other rates
500W RMS Class AB 4-Channel SK Series Stereo Bridgeable Car Amplifier
Free Ground Shipping within the 48 states
SK Series 4-Channel Class AB Amplifier • 85W x 4 Chan. @ 4 ohms • 125W x 4 Chan. @ 2 ohms • 250W x 2 Chan. @ 4 ohms • 3-Way System Protection • 4/3/2/1 Channel Operation • 4 Gauge Power and Ground Inputs • Double Sided 1 Oz Circuit Board
$299.99
Shipping: FREE
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790W RMS Class D 4-Channel SK Series Stereo Bridgeable Car Amplifier
Free Ground Shipping within the 48 states
SK Series 4-Channel Class D Amplifier • 133W x 4 Chan. @ 4 ohms • 204W x 4 Chan. @ 2 ohms • 396W x 2 Chan. @ 4 ohms • 3-Way System Protection • 4/3/2/1 Channel Operation • 4 Gauge Power and Ground Inputs • Double Sided 1 Oz Circuit Board
$479.99
Shipping: FREE
To the US 48 • other rates
320W RMS 4-Channel iON Series Class D Full-Range Digital Stereo Bridgeable Amplifier (i3204)
Free Ground Shipping within the 48 states
iON Series 4-Channel Class D Amplifier • 60W x 4 Chan. @ 4 ohms • 80W x 4 Chan. @ 2 ohms • 160W x 2 Chan. @ 4 ohms • 3-Way System Protection • 4/3/2/1 Channel Operation • 4 Gauge Power and Ground Inputs • Surface Mount Technology (SMT)
$129.95
Shipping: FREE
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200W RMS 4-Channel Class AB Chaos EXXtreme Series Stereo Bridgeable Car Amplifier
Chaos EXXtreme Series 4-Channel Class AB Amplifier • 50W x 2 Chan. @ 4 ohms • 3-Way System Protection • 4/3/2/1 Channel Operation • 8 Gauge Power and Ground Inputs • Heavy Duty Aluminum Heat Sink
$59.00
320W RMS 4-Channel Marine Amplifier
Free Ground Shipping within the 48 states
Marine Series 4-Channel Class AB Car Amplifier • 60W x 4 chan. @ 4 ohms • 80W x 4 chan. @ 2 ohms • 160W x 2 chan. @ 4 ohms • 320W RMS • MOSFET power supply • Preamp RCA outputs • Thermal, voltage, and short protection circuitry
$119.95
Shipping: FREE
To the US 48 • other rates
  • 4.8
  (13 reviews)
Availability: Out of Stock - Backorder
E-mail me when it is in stock
600W RMS 4-Channel Class D Prime Series Amplifier
Free Ground Shipping within the 48 states
Prime Series Full Range Class D 4-Channel Car Amplifier • 100W x 4 Chan. @ 4 ohms • 150W x 4 Chan. @ 2 ohms • 300W x 2 Chan. @ 4 ohms Bridged • Variable Bass Boost • Variable High-Pass Crossover • CEA-2006 Compliant
$234.99
Shipping: FREE
To the US 48 • other rates
  • 5.0
  (4 reviews)
Availability: Out of Stock - Backorder
E-mail me when it is in stock
Items per page: 20 50 100
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Related Categories

Amplifier Wiring Kits
Get all the cables, wires, and hardware you need to install your new car 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! Make sure to get the kit that is best designed for your car audio system.
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.

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.