1950 GMC FC281

Use our shopping filters to find the right 2/3/4-channel amp to power upgraded speakers properly.

Multi-channel amps (2/3/4 and more) for when you upgrade speakers.


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Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.

Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

The RMS output figure is much more accurate than the peak rating when comparing products.

The total peak power output is measured as the wattage per channel multiplied by the number of channels, and is calculated at the lowest level of operating impedance.

It is measured during a brief musical burst, such as a sudden drum accent. Some manufacturers display peak power ratings on the face of their products to increase the appeal.

The RMS power rating is more accurate, and we recommend using it for product comparison.

Many brands group their products into series or lines of products to help customers know the level of quality (good, better, best for example). You can filter by series and the brand using our guided browsing.
The lowest impedance the amplifier will handle when it is not bridged.
The lowest impedance the amplifier will handle when it is bridged.
If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
Sonic Certified amplifiers have been tested by the experts at Sonic Electronix to meet or exceed the wattage ratings provided by the manufacturer. If this is marked as Yes, then you can trust the wattage ratings. If marked as No, then we have tested the amplifier and it did not meet the advertised wattage ratings. If marked as Not Tested, then the Sonic Electronix experts have not yet been able to test the amp.
Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
Amplifiers that have been tested to meet specific standards. When a car amplifier meets these standards, you can be sure that it will be able to produce the amount of power specified by the official CEA-2006 rating. Usually, these rating consist of the following items:
  • RMS Power
  • Signal-to-Noise Ratio

This rating applies to both external car amplifiers, as well as the amplifiers inside of in-dash stereos.

This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
This feature will tell you if the amplifier has the capability to connect to a Bluetooth device.
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NVX VADM4

400W RMS V-Series Full Range Class D 4-Channel Car/Marine/Powersports Amplifier

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400W RMS V-Series Full Range Class D 4-Channel Car/Marine/Powersports Amplifier

• 400 Watt True RMS Output!
• Marine Certified 4-Channel Micro Class D Amplifier
• 75W x 4-Chan. @ 4 ohms
• 100W x 4-Chan. @ 2 ohms
• 3-Way System Protection
• 4/2 Channel Operation
• 8 Gauge Power and Ground Inputs
• Extremely Small Footprint!

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Install Your Amp Without Cutting Factory Wiring

Simplify adding an aftermarket amplifier without modifying your vehicle's original wiring

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NVX XKIT84 4-Channel 8-Gauge Wiring Kit

In case you didn't know, NVX has top notch wire and this kit has everything you need!

$79.99

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NVX XAD21

2000W RMS X-Series Full-Bridge Class D 1-Ohm Stable 2-Channel Amplifier

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2000W RMS X-Series Full-Bridge Class D 1-Ohm Stable 2-Channel Amplifier

• 250 watts x 2 channel @ 4 ohms
• 550 watts x 2 channel @ 2 ohms
• 1000 watts x 2 channel @ 1 ohm
• Total RMS Power: 2000 watts
• CEA-2006 Compliant

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• 250 watts x 2 channel @ 4 ohms
• 550 watts x 2 channel @ 2 ohms
• 1000 watts x 2 channel @ 1 ohm
• Total RMS Power: 2000 watts
• CEA-2006 Compliant

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Give Your Amplifier the Power It Deserves

200 Amp Direct Upgrade High Output Alternator for Your Car

$519.99

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NVX XKIT42 100% OFC True 4 Gauge Wiring Kit with RCA Cables and Speaker Wire

The reviews speak for themselves, this is awesome wire with everything you need!

$99.99

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2-Channel Line Out Converter

2-Channel Line Out Converter

$79.99

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Rockford Fosgate Punch P1000X5

1000W RMS Punch Series 5-Channel Stereo Full-Range Class BD Car Amplifier w/ Dedicated Sub Channel

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1000W RMS Punch Series 5-Channel Stereo Full-Range Class BD Car Amplifier w/ Dedicated Sub Channel

• 75W x 4 Chan. + 200W x Sub Chan. @ 4 ohms
• 100W x 4 Chan. + 400W Sub Chan. @ 2 ohms
• 100W x 5 Chan. RMS
• Built In NOMAD "Real Time" Analog Computer
• 5/4/3/2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• MESHA3 Reduces MOSFET Temperatures for Improved Durability

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200 Amp High Output Alternator for 2012-2018 Jeep Wrangler

200 Amp High Output Alternator for 2012-2018 Jeep Wrangler

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Taramps DS 800x4 -1 OHM

800W RMS DS Series 1-Ohm Stable Class-D 4-Channel Amplifier

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800W RMS DS Series 1-Ohm Stable Class-D 4-Channel Amplifier

• 136 watts x 4 channel @ 2 ohms
• 200 watts x 4 channel @ 1 ohms
• Bridged: 400 watts x 2 channel @ 2 ohms
• Total RMS Power: 800 watts
• Class D 1 ohms Stable 4-Channel Amplifier

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300 Amp Direct Upgrade High Output Alternator for Your Car

$719.99

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Install Your Amp Without Cutting Factory Wiring

Simplify adding an aftermarket amplifier without modifying your vehicle's original wiring

$29.99

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Belva BAK44 4-Channel 4 Gauge Amplifier Installation Kit

Complete 4-Channel CCA 4 Gauge Amp Kit with RCA Cables and Speaker Wire

$39.99

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JL Audio JD400/4

400W RMS JD Series Class-D 4-Channel Car Amplifier

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400W RMS JD Series Class-D 4-Channel Car Amplifier

• 75 watts x 4 channel @ 4 ohms
• 100 watts x 4 channel @ 2 ohms
• Bridged: 200 watts x 2 channel @ 4 ohms
• Total RMS Power: 400 watts
• Class D 2 ohms Stable 4-Channel Amplifier

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Install Your Amp Without Cutting Factory Wiring

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NVX XKIT44 4-Gauge 4-Channel Wiring Kit

4-Channel 100% OFC Complete True 4 Gauge Amp Kit with RCA Cables and Speaker Wire

$109.99

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NVX NBA201 Amplifier with Amplifier Wiring Kit

1400W Peak (700W) RMS N-Series Class A/B 2-Channel Amplifier

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1400W Peak (700W) RMS N-Series Class A/B 2-Channel Amplifier

• 200 watts x 2 channel @ 4 ohms
• 350 watts x 2 channel @ 2 ohms
• Bridged: 1400 watts x 1 channel @ 4 ohms
• Total RMS Power: 700 watts
• CEA-2006 Compliant
• Includes Amplifier Wiring Kit

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• 200 watts x 2 channel @ 4 ohms
• 350 watts x 2 channel @ 2 ohms
• Bridged: 1400 watts x 1 channel @ 4 ohms
• Total RMS Power: 700 watts
• CEA-2006 Compliant
• Includes Amplifier Wiring Kit

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NVX XBG3PK Big 3 Kit with True 0 Gauge 100% Oxygen-Free Copper

1/0 AWG Big 3 Upgrade Kit with 100% OFC Wire for Audio Sytems up to 350 Amps

$99.99

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NVX XAD21 with Amplifier Wiring Kit

2000W RMS X-Series Full-Bridge Class D 1-Ohm Stable 2-Channel Amplifier

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2000W RMS X-Series Full-Bridge Class D 1-Ohm Stable 2-Channel Amplifier

• 250 watts x 2 channel @ 4 ohms
• 550 watts x 2 channel @ 2 ohms
• 1000 watts x 2 channel @ 1 ohm
• Total RMS Power: 2000 watts
• CEA-2006 Compliant
• Includes Amplifier Wiring Kit

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• 250 watts x 2 channel @ 4 ohms
• 550 watts x 2 channel @ 2 ohms
• 1000 watts x 2 channel @ 1 ohm
• Total RMS Power: 2000 watts
• CEA-2006 Compliant
• Includes Amplifier Wiring Kit

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NVX XBG3PK Big 3 Kit with True 0 Gauge 100% Oxygen-Free Copper

1/0 AWG Big 3 Upgrade Kit with 100% OFC Wire for Audio Sytems up to 350 Amps

$99.99

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Taramps DS 800x2

800W RMS DS Series Full Range Class-D 2-Channel Amplifier

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800W RMS DS Series Full Range Class-D 2-Channel Amplifier

• 250 watts x 2 channel @ 4 ohms
• 400 watts x 2 channel @ 2 ohms
• Bridged: 800 watts x 1 channel @ 4 ohms
• Total RMS Power: 800 watts
• Class D 2 ohms Stable 2-Channel Amplifier

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Give Your Amplifier the Power It Deserves

300 Amp Direct Upgrade High Output Alternator for Your Car

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NVX XMICROLOC2

Add a 2-Channel amp without replacing your factory radio

$14.99

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NVX XBBR2

Looking to fine tune the bass in your vehicle? Look no further

$89.99

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Alpine MRV-F300

300W 4-Channel Class D V-Power Series Compact Car Amplifier

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300W 4-Channel Class D V-Power Series Compact Car Amplifier

• RMS Power: 50W x 4-Chan. @ 4 ohms, 75W x 4-Chan. @ 2 ohms
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 8 Gauge Power and Ground Inputs
• Same Power in a 40% Smaller Chassis

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• RMS Power: 50W x 4-Chan. @ 4 ohms, 75W x 4-Chan. @ 2 ohms
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 8 Gauge Power and Ground Inputs
• Same Power in a 40% Smaller Chassis

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Install Your Amp Without Cutting Factory Wiring

Simplify adding an aftermarket amplifier without modifying your vehicle's original wiring

$29.99

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NVX XKIT84 4-Channel 8-Gauge Wiring Kit

In case you didn't know, NVX has top notch wire and this kit has everything you need!

$79.99

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NVX VAD10004

1000W RMS Full Range Class D 4-Channel Car/Marine/Powersports Amplifier

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1000W RMS Full Range Class D 4-Channel Car/Marine/Powersports Amplifier

• 150 watts x 4 channel @ 4 ohms
• 250 watts x 4 channel @ 2 ohms
• Bridged: 500 watts x 2 channel @ 4 ohms
• Total RMS Power: 1000 watts
• CEA-2006 Compliant
• Class D 2 ohms Stable 4-Channel Amplifier

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Give Your Amplifier the Power It Deserves

200 Amp Direct Upgrade High Output Alternator for Your Car

$519.99

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Supreme and comfortable KN95 PFF2 Mask Respirators

$37.40

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Install Your Amp Without Cutting Factory Wiring

Simplify adding an aftermarket amplifier without modifying your vehicle's original wiring

$29.99

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NVX NDA501

1960W Peak (980W) RMS N-Series Class-D 5-Channel Car Audio Amplifier

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1960W Peak (980W) RMS N-Series Class-D 5-Channel Car Audio Amplifier

• 4 ohms: 80 watts x 4 channel + 310 watts x 1 channel
• 2 ohms: 120 watts x 4 channel + 500 watts x 1 channel
• Total power output: 980 watts watts
• Includes Bass Remote
• CEA-2006 Compliant

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200 Amp High Output Alternator for 2012-2018 Jeep Wrangler

200 Amp High Output Alternator for 2012-2018 Jeep Wrangler

$579.99

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Install Your Amp Without Cutting Factory Wiring

Simplify adding an aftermarket amplifier without modifying your vehicle's original wiring

$29.99

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6 inputs / 6 outputs High Voltage Active Line Output Converter with Impedance Matching and Remote Level Control

The XLOC66X helps you integrate your entire after market system with your factory head unit

$99.99

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Alpine KTA-450

4-Channel 200 Watt RMS Power Pack Amplifier

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4-Channel 200 Watt RMS Power Pack Amplifier

• Class D 4-channels Power Pack Amplifier
• Power Handling: 50W RMS x 4 @ 4ohms/45W RMS x 4 @ 2ohms
• Dynamic Peak Power (DPP)
• Frequency Response: 15-50 Hz
• CTA-2006 compliant

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• Class D 4-channels Power Pack Amplifier
• Power Handling: 50W RMS x 4 @ 4ohms/45W RMS x 4 @ 2ohms
• Dynamic Peak Power (DPP)
• Frequency Response: 15-50 Hz
• CTA-2006 compliant

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Install Your Amp Without Cutting Factory Wiring

Simplify adding an aftermarket amplifier without modifying your vehicle's original wiring

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NVX XIV45 4-Channel RCA Audio Interconnect Cable

5 Meters (16.4 ft.) 4-Channel RCA Audio Interconnect Cable with Dual Twisted Pair Hyper-Flex Technology

$19.99

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Hertz HCP2

400W Class AB 2-Channel Car Audio Subwoofer Amplifier

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400W Class AB 2-Channel Car Audio Subwoofer Amplifier

• 65 Watts RMS x 2 @ 4 ohms
• 100 Watts RMS x 2 @ 2 ohms
• CEA-2006 Compliant
• Refined Heatsink with High Convection Capability
• Automatic Remote Turn-On/Off function
• Dimensions: 8.46" x 7.48" x 1.97"

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NVX XKIT42 100% OFC True 4 Gauge Wiring Kit with RCA Cables and Speaker Wire

The reviews speak for themselves, this is awesome wire with everything you need!

$99.99

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2-Channel Line Out Converter

2-Channel Line Out Converter

$79.99

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NVX XBBR2

Looking to fine tune the bass in your vehicle? Look no further

$89.99

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JL Audio RD400/4

400W RMS RD-Series NexD 4-Channel Class-D Amplifier

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400W RMS RD-Series NexD 4-Channel Class-D Amplifier

• 75 Watts RMS x 4 @ 4 ohms
• 100 Watts RMS x 4 @ 2 ohms
• Total Peak Power: 800 Watts
• Variable Bass Boost: 0 to +12 dB bass boost at 45 Hz
• Heavy duty aluminum alloy heat-sink
• 7"W x 9-3/16"L x 2-1/8"H

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Install Your Amp Without Cutting Factory Wiring

Simplify adding an aftermarket amplifier without modifying your vehicle's original wiring

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NVX XKIT44 4-Gauge 4-Channel Wiring Kit

4-Channel 100% OFC Complete True 4 Gauge Amp Kit with RCA Cables and Speaker Wire

$109.99

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NVX MVPA4

600W RMS Marine-V Series 4-Channel Class D Compact Marine/Powersports/Motorcycle Amplifier

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600W RMS Marine-V Series 4-Channel Class D Compact Marine/Powersports/Motorcycle Amplifier

• 4-Channel Micro Class D Amplifier
• 100W x 4-Chan. @ 4 ohms
• 150W x 4-Chan. @ 2 ohms
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 8 Gauge Power and Ground Inputs

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200 Amp High Output Alternator for 2012-2018 Jeep Wrangler

200 Amp High Output Alternator for 2012-2018 Jeep Wrangler

$579.99

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Install Your Amp Without Cutting Factory Wiring

Simplify adding an aftermarket amplifier without modifying your vehicle's original wiring

$29.99

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NVX XKIT84 4-Channel 8-Gauge Wiring Kit

In case you didn't know, NVX has top notch wire and this kit has everything you need!

$79.99

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Kicker CXA360.4 (46CXA3604)

360W RMS CX Series Class-D 4-Channel Amplifier

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360W RMS CX Series Class-D 4-Channel Amplifier

• 65 Watts RMS x 4 @ 4 ohms
• 90 Watts RMS x 4 @ 2 ohms
• 180 Watts RMS x 2 @ 4 ohms (bridged)
• Class A/B 4-Channel Amplifier
• KickEQ™ 6dB variable bass boost for those additional low frequencies
• FIT+™ (Fail-safe Integration Technology-PLUS) means it works with nearly every radio

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NVX XKIT84 4-Channel 8-Gauge Wiring Kit

In case you didn't know, NVX has top notch wire and this kit has everything you need!

$79.99

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Hertz HCP4

Class AB 4-Channel Car Subwoofer Amplifier

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Class AB 4-Channel Car Subwoofer Amplifier

• 65 Watts RMS x 4 @ 4 ohms
• 95 Watts RMS x 4 @ 2 ohms
• CEA-2006 Compliant
• Refined Heatsink with High Convection Capability
• Automatic Remote Turn-On/Off function
• Dimensions: 12.40" x 7.48" x 1.97"

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Supreme and comfortable KN95 PFF2 Mask Respirators

$37.40

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Install Your Amp Without Cutting Factory Wiring

Simplify adding an aftermarket amplifier without modifying your vehicle's original wiring

$29.99

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NVX XKIT84 4-Channel 8-Gauge Wiring Kit

In case you didn't know, NVX has top notch wire and this kit has everything you need!

$79.99

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Taramps TS 400X4

400W RMS TS Series Full Range Class D 4-Channel Amplifier

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400W RMS TS Series Full Range Class D 4-Channel Amplifier

• 63 watts x 4 channel @ 4 ohms
• 100 watts x 4 channel @ 2 ohms
• Bridged: 200 watts x 2 channel @ 4 ohms
• Total RMS Power: 400 watts
• Class D 2 ohms Stable 4-Channel Amplifier

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Give Your Amplifier the Power It Deserves

300 Amp Direct Upgrade High Output Alternator for Your Car

$719.99

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Supreme and comfortable KN95 PFF2 Mask Respirators

$37.40

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Install Your Amp Without Cutting Factory Wiring

Simplify adding an aftermarket amplifier without modifying your vehicle's original wiring

$29.99

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NVX MVPA6

Marine-V Series 900W 6-Channel Class D Compact Marine/Powersports/Motorcycle Amplifier

Spend 300+ and Save with Code "Madness"
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Marine-V Series 900W 6-Channel Class D Compact Marine/Powersports/Motorcycle Amplifier

• 100 Watts RMS x 6 @ 4 ohms
• 150 Watts RMS x 6 @ 2 ohms
• CEA-2006 Compliant
• Weatherproof Amplifier
• Micro Amp
• 12.9"W x 4.4"L x 1.7"H

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• 100 Watts RMS x 6 @ 4 ohms
• 150 Watts RMS x 6 @ 2 ohms
• CEA-2006 Compliant
• Weatherproof Amplifier
• Micro Amp
• 12.9"W x 4.4"L x 1.7"H

Cerwin Vega VCU86

6-Channel 1200W Bridgeable Audio Subwoffer Mini Amplifier

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6-Channel 1200W Bridgeable Audio Subwoffer Mini Amplifier

• 100 Watts RMS x 6 @ 4 ohms
• 150 Watts RMS x 6 @ 2 ohms
• Total RMS Power: 1035 Watts
• CEA-2006 Compliant
• Enhanced Power IR Digital Chipset
• Compact Matching Heatsink Platform Dimensions
• 10.5”L x 4”W x 1.4”H

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• 100 Watts RMS x 6 @ 4 ohms
• 150 Watts RMS x 6 @ 2 ohms
• Total RMS Power: 1035 Watts
• CEA-2006 Compliant
• Enhanced Power IR Digital Chipset
• Compact Matching Heatsink Platform Dimensions
• 10.5”L x 4”W x 1.4”H

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Install Your Amp Without Cutting Factory Wiring

Simplify adding an aftermarket amplifier without modifying your vehicle's original wiring

$29.99

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6 inputs / 6 outputs High Voltage Active Line Output Converter with Impedance Matching and Remote Level Control

The XLOC66X helps you integrate your entire after market system with your factory head unit

$99.99

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Stinger SI4612 4000 Series Interconnect Cable

12 ft. 6-Channel 4000 Series Audio Interconnect Cable

$25.99

Add

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    Take advantage of our VIP rewards like 10% back on your purchases, free 2-day shipping, extended warranties, and free returns! Gain access to all of these rewards without any membership fees.
    Get great discounted (and possibly FREE) installation accessories with most car stereo purchases. This includes dash kits, wiring harnesses and antenna adapters that you will need to properly install your new car stereo.
    We are an Authorized Dealer for all the brands we sell, including the most premium brands in car and marine audio such as Hertz, JL Audio, NVX, Rockford Fosgate, Kicker, Alpine, Kenwood and many more.
    Shop Deals and get up to 30% off premium brands! Shop Now! We are always looking out for the best products and deals to offer our customers. Don’t pay too much by shopping elsewhere!
    We have information on brands, gear, and more for you to explore! Check out our YouTube Channel for helpful how-to videos, product reviews, and Q&As. For a more detailed look, also visit our Learning Center!
    Our trained experts are here to assist you! They are just a phone call or click away to help you get the right gear for you and your vehicle!
    Why Shop With Us?

    1950 GMC FC281

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