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.

Number of Channels

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.

Total RMS Power Output

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.

Up to 249.99 watts (22)

250–499.99 watts (82)

500–999.99 watts (136)

1,000–1,499.99 watts (61)

1,500 watts or more (65)

Total Peak Power Output

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.

Up to 499.99 watts (19)

500–999.99 watts (41)

1,000–1,999.99 watts (73)

2,000–2,999.99 watts (42)

3,000 watts or more (32)

Minimum Impedance Unbridged

The lowest impedance the amplifier will handle when it is not bridged.

Minimum Impedance Bridged

The lowest impedance the amplifier will handle when it is bridged.

Remote bass/level controller

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.

Yes (196)

No (123)

Optional (78)

Preamp Outputs

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.

Built-in Crossover

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

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.

Yes (223)

No (72)

Optional (66)

Yes - with included adapter (18)

Maximum Input Gauge Size

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.

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NVX Audio Upgrade Kit – NPKG212 Bass Package with 2 Pair 6x9" Speakers

Includes Loaded Dual 12" Slot Ported Box, Monoblock Amp w/ Remote, 2 Pair 6x9" Coaxial Speakers, Amp Kit, Sound Damping, and Roller

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NVX Audio Upgrade Kit – NPKG212 Bass Package with 2 Pair 6x9" Speakers

Includes Loaded Dual 12" Slot Ported Box, Monoblock Amp w/ Remote, 2 Pair 6x9" Coaxial Speakers, Amp Kit, Sound Damping, and Roller

• 12" Loaded Dual Subwoofer Enclosure with Amplifier
• 500 watts RMS
• Class D Amplifier
• Variable Bass Boost
• Speaker-Level Inputs
• Wired Remote Bass Level Control
• Includes 6x9(2) Co-axial Speaker and Damping Kits

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Kicker TRTP102 (48TRTP102) & CXA400.1 (46CXA4001T) w/ Free Amp Install Kit

800W Peak Loaded Dual 10" Sealed Truck Enclosure with 400W RMS Class D Monoblock Car Amplifier, 8 Gauge Wiring Kit, Bass Remote, and + Bundle

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Kicker TRTP102 (48TRTP102) & CXA400.1 (46CXA4001T) w/ Free Amp Install Kit

800W Peak Loaded Dual 10" Sealed Truck Enclosure with 400W RMS Class D Monoblock Car Amplifier, 8 Gauge Wiring Kit, Bass Remote, and + Bundle

Kicker TRTP102 800W Peak Dual 10 Inch Sealed Truck Enclosure
400W RMS Class D CX-Series Monoblock Car Amplifier
Wired Bass Remote Controller for CX Series Amplifiers
Belva 8 Gauge Premium CCA 2-Channel Amplifier Wiring Kit with RCA
NVX Premium Polyurethane Foam Can Insulator Sleeve Koozie

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Kicker TRTP102 800W Peak Dual 10 Inch Sealed Truck Enclosure
400W RMS Class D CX-Series Monoblock Car Amplifier
Wired Bass Remote Controller for CX Series Amplifiers
Belva 8 Gauge Premium CCA 2-Channel Amplifier Wiring Kit with RCA
NVX Premium Polyurethane Foam Can Insulator Sleeve Koozie

Diamond Audio DMD250.1D with Belva 4 Gauge Amp Kit

250W RMS DMD Series Class-D Monoblock Amplifier

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Diamond Audio DMD250.1D with Belva 4 Gauge Amp Kit

250W RMS DMD Series Class-D Monoblock Amplifier

• 160 watts x 4 channel @ 4 ohm
• 250 watts x 2 channel @ 2 ohm
• Total RMS Power: 250 watts
• Dampening Factor: > 250
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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Diamond Audio DES400.2D with NVX 8 Gauge Amp Kit

500W RMS DES Series Class-D 2-Channel Amplifier

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Diamond Audio DES400.2D with NVX 8 Gauge Amp Kit

500W RMS DES Series Class-D 2-Channel Amplifier

• 200 watts x 2 channel @ 4 ohm
• 250 watts x 2 channel @ 2 ohm
• Bridged: 500 watts x 1 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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Pioneer GM-DX975 with NVX 4 Gauge Amp Kit

2000W Peak (800W RMS) GM Series Class-D 5-Channel Amplifier with Remote Bass Knob

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Pioneer GM-DX975 with NVX 4 Gauge Amp Kit

2000W Peak (800W RMS) GM Series Class-D 5-Channel Amplifier with Remote Bass Knob

• 75 watts x 4 channel + 350 watts x 1 channel @ 4 ohm
• 100 watts x 4 channel + 600 watts x 1 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm + 600 watts x 1 channel @ 2 ohm
• Total RMS Power: 800 watts
• Class D 2 ohm Stable 5-Channel Amplifier
• Includes Amplifier Wiring Kit

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NVX VAD17001 with Amplifier Wiring Kit

1700W RMS Class D Monoblock Car/Marine/Powersports Amp with Bass Remote (Marine Certified) + Amp Kit

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NVX VAD17001 with Amplifier Wiring Kit

1700W RMS Class D Monoblock Car/Marine/Powersports Amp with Bass Remote (Marine Certified) + Amp Kit

• RMS: 800 x 1 @ 4 ohm, 1350W x 1 @ 2 ohm, 1700W x 1 @ 1 ohm
• Total RMS Power: 1700W
• CEA-2006 Compliant
• Wired Bass Remote Included
• Efficient Class D Design
• Dimensions: 10.1"W x 5.4"D x 2.0H
• Includes Amplifier Wiring Kit

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Alpine KTA-450 with NVX 8 Gauge Amp Kit

4-Channel 200 Watt RMS Power Pack Amplifier

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Alpine KTA-450 with NVX 8 Gauge Amp Kit

4-Channel 200 Watt RMS Power Pack Amplifier

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

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Kicker 46CXA800.1 with Amp Kit and 3 Year Warranty

800W Peak (600W RMS) CX Series Class-D Monoblock Amplifier with 4 Gauge Amp Kit

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Kicker 46CXA800.1 with Amp Kit and 3 Year Warranty

800W Peak (600W RMS) CX Series Class-D Monoblock Amplifier with 4 Gauge Amp Kit

• 300 Watts RMS x 1 @ 4 ohm
• 600 Watts RMS x 1 @ 2 ohm
• 800 Watts RMS x 1 @ 1 ohm
• Efficient Class-D Monoblock Amplifier
• KickEQ™ 6dB variable bass boost for those additional low frequencies
• FIT+™ (Fail-safe Integration Technology-PLUS) means it works with nearly every radio
• Amplifier wiring kit included

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NVX NDA6004 with Amp Wiring Kit

1200W Peak (600W RMS) N-Series Class-D 4-Channel Amplifier + NVX XKIT44 4 Gauge 4-Channel Premium Amp Wiring Kit

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NVX NDA6004 with Amp Wiring Kit

1200W Peak (600W RMS) N-Series Class-D 4-Channel Amplifier + NVX XKIT44 4 Gauge 4-Channel Premium Amp Wiring Kit

• 100 watts x 4 channel @ 4 ohm
• 160 watts x 4 channel @ 2 ohm
• Bridged: 320 watts x 2 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes 4 Gauge Amp Wiring Kit

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Deaf Bonce Apocalypse 1300.1 Pro with Belva 4 Gauge Amp Kit

1300W RMS Class D Apocalypse Atom Pro Series Monoblock Subwoofer Amplifier with Bass Remote

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Deaf Bonce Apocalypse 1300.1 Pro with Belva 4 Gauge Amp Kit

1300W RMS Class D Apocalypse Atom Pro Series Monoblock Subwoofer Amplifier with Bass Remote

• 490 watts x 1 channel @ 4 ohm
• 780 watts x 1 channel @ 2 ohm
• 1300 watts x 1 channel @ 1 ohm
• Total RMS Power: 1300 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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169

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Crunch GP-1500.4 with Belva BAK44 Amp Kit

1500W RMS Class AB Ground Pounder Series 4 Channel Car Amplifier + 4 Gauge Premium (CCA) Complete 4-Channel Amplifier Wiring Kit with RCA up to 1200 Watts

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Crunch GP-1500.4 with Belva BAK44 Amp Kit

1500W RMS Class AB Ground Pounder Series 4 Channel Car Amplifier + 4 Gauge Premium (CCA) Complete 4-Channel Amplifier Wiring Kit with RCA up to 1200 Watts

• 185 watts x 4 channel @ 4 ohm
• 375 watts x 4 channel @ 2 ohm
• Bridged: 750 watts x 2 channel @ 4 ohm
• Total RMS Power: 1500 watts
• Class A/B 2 ohm Stable 4-Channel Amplifier

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• 185 watts x 4 channel @ 4 ohm
• 375 watts x 4 channel @ 2 ohm
• Bridged: 750 watts x 2 channel @ 4 ohm
• Total RMS Power: 1500 watts
• Class A/B 2 ohm Stable 4-Channel Amplifier

NVX Audio Upgrade Kit – QBSTA & Two Pair 6x9" Speakers

900W Max (300W RMS) 11" Powered Spare Tire Subwoofer Box w/ Remote Bass Knob, Two Pair 6x9" Coaxial Speakers, Amp Kit, Sound Damping, and Roller

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NVX Audio Upgrade Kit – QBSTA & Two Pair 6x9" Speakers

900W Max (300W RMS) 11" Powered Spare Tire Subwoofer Box w/ Remote Bass Knob, Two Pair 6x9" Coaxial Speakers, Amp Kit, Sound Damping, and Roller

• 11" Spare Tire Subwoofer System
• Built-In Class D Amplifier
• Top-mount amplifier controls
• Speaker-Level Inputs
• Wired Remote Bass Level Control
• Includes 6x9(2) Co-axial Speaker and Damping Kits

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Rockford Fosgate P1000X1bd with Amplifier Wiring Kit

1000W RMS Punch Series Monoblock Class BD Car Power Amplifier

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Rockford Fosgate P1000X1bd with Amplifier Wiring Kit

1000W RMS Punch Series Monoblock Class BD Car Power Amplifier

• RMS: 300W x 1 @ 4 ohm, 500W x 1 @ 2 ohm, 1000W x 1 @ 1 ohm
• Total RMS Power: 1000W
• CEA-2006 Compliant
• Tuned Bass EQ: 0 to +18 dB
• Super Efficient Class BD Circuitry
• Dimensions: 13-5/16"L x 7-3/4"W x 2-3/8"H

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Diamond Audio HXM800.4D with NVX 8 Gauge Amp Kit

800W RMS HXM Series Class-D 4-Channel Full Range Amplifier

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Diamond Audio HXM800.4D with NVX 8 Gauge Amp Kit

800W RMS HXM Series Class-D 4-Channel Full Range Amplifier

• 120 watts x 4 channel @ 4 ohm
• 200 watts x 4 channel @ 2 ohm
• Bridged: 400 watts x 2 channel @ 4 ohm
• Total RMS Power: 800 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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List price $787.98

-18% $649.99

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Kicker CXA1200.1 (46CXA12001T) with NVX 4 Gauge Amp Kit

1200W RMS Class-D CX-Series Monoblock Car Amplifier

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Kicker CXA1200.1 (46CXA12001T) with NVX 4 Gauge Amp Kit

1200W RMS Class-D CX-Series Monoblock Car Amplifier

• 600 watts x 1 channel @ 4 ohm
• 1200 watts x 1 channel @ 2 ohm
• 1200 watts x 1 channel @ 1 ohm
• Total RMS Power: 1200 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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Kenwood KAC-9106D w/Belva 1.0 Farad Capacitor + Belva 2000 Watt Handling Amp Kit

1000W RMS Class D Monoblock Car Amplifier w/ 1.0 Farad Capacitor & 4 AWG Amp Kit

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Kenwood KAC-9106D w/Belva 1.0 Farad Capacitor + Belva 2000 Watt Handling Amp Kit

1000W RMS Class D Monoblock Car Amplifier w/ 1.0 Farad Capacitor & 4 AWG Amp Kit

• Kenwood KAC-9106D Performance Series 1000W Class-D Monoblock Amplifier
• Belva BAK42 Complete 4 Gauge 2-Channel Amplifier Installation Kit
• Belva BB1D 1.0 Farad Capacitor
• RMS: 500W x 1 @ 4 ohm
• Premium Power and Ground Wire Provides Optimal Power Transfer

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NVX VADM1 with Amplifier Wiring Kit

500W RMS Class D Monoblock Amplifier with Bass Remote

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NVX VADM1 with Amplifier Wiring Kit

500W RMS Class D Monoblock Amplifier with Bass Remote

• 500 Watt True RMS Output
• Marine Certified Monoblock Micro Class D Amplifier
• 180W x 1-Chan. @ 4 ohm
• 320W x 1-Chan. @ 2 ohm
• 500W x 1-Chan. @ 1 ohm
• Extremely Small Footprint
• Includes Amplifier Wiring Kit

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List price $335.98

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NVX VAD10004 with Amplifier Wiring Kit

1000W RMS Full Range 4-Channel Amplifier

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NVX VAD10004 with Amplifier Wiring Kit

1000W RMS Full Range 4-Channel Amplifier

• RMS: 150 x 4 @ 4 ohm, 250W x 4 @ 2 ohm, Bridged 500W x 2 @ 4 ohm
• Total RMS Power: 1000W
• CEA-2006 Compliant
• Efficient Full Range Class D Design
• Includes Amplifier Wiring Kit

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• RMS: 150 x 4 @ 4 ohm, 250W x 4 @ 2 ohm, Bridged 500W x 2 @ 4 ohm
• Total RMS Power: 1000W
• CEA-2006 Compliant
• Efficient Full Range Class D Design
• Includes Amplifier Wiring Kit

Kenwood KAC-D3104 with Amplifier Wiring Kit

Class D 4-Channel Amplifier (600 Watts Peak Power)

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Kenwood KAC-D3104 with Amplifier Wiring Kit

Class D 4-Channel Amplifier (600 Watts Peak Power)

• 4 ohm: 50 watts x 4 chan.
• 2 ohm: 75 watts x 4 chan.
• Total Peak Power: 600 Watts
• Speaker Level Input
• Signal Sensing Turn-On
• Variable Low Pass/High Pass Filter
• Includes Amplifier Wiring Kit

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DS18 SXE-2000.4D/RD (Red) with Belva 4 Gauge Amp Kit

2000W Peak (640W RMS) Class D SXE Series 4-Channel Car Amplifier

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DS18 SXE-2000.4D/RD (Red) with Belva 4 Gauge Amp Kit

2000W Peak (640W RMS) Class D SXE Series 4-Channel Car Amplifier

• 100 watts x 4 channel @ 4 ohm
• 160 watts x 4 channel @ 2 ohm
• Bridged: 320 watts x 3 channel @ 4 ohm
• Total RMS Power: 640 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier (Red)
• Includes Amplifier Wiring Kit

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Car Amplifier Packages & Bundles for your 1990 325iX

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NVX Audio Upgrade Kit – NPKG212 Bass Package with 2 Pair 6x9" Speakers

NVX Audio Upgrade Kit – NPKG212 Bass Package with 2 Pair 6x9" Speakers

Kicker TRTP102 (48TRTP102) & CXA400.1 (46CXA4001T) w/ Free Amp Install Kit

Kicker TRTP102 (48TRTP102) & CXA400.1 (46CXA4001T) w/ Free Amp Install Kit

Diamond Audio DMD250.1D with Belva 4 Gauge Amp Kit

Diamond Audio DMD250.1D with Belva 4 Gauge Amp Kit

Diamond Audio DES400.2D with NVX 8 Gauge Amp Kit

Diamond Audio DES400.2D with NVX 8 Gauge Amp Kit

Pioneer GM-DX975 with NVX 4 Gauge Amp Kit

Pioneer GM-DX975 with NVX 4 Gauge Amp Kit

NVX VAD17001 with Amplifier Wiring Kit

NVX VAD17001 with Amplifier Wiring Kit

Alpine KTA-450 with NVX 8 Gauge Amp Kit

Alpine KTA-450 with NVX 8 Gauge Amp Kit

Kicker 46CXA800.1 with Amp Kit and 3 Year Warranty

Kicker 46CXA800.1 with Amp Kit and 3 Year Warranty

NVX NDA6004 with Amp Wiring Kit

NVX NDA6004 with Amp Wiring Kit

Deaf Bonce Apocalypse 1300.1 Pro with Belva 4 Gauge Amp Kit

Deaf Bonce Apocalypse 1300.1 Pro with Belva 4 Gauge Amp Kit

Crunch GP-1500.4 with Belva BAK44 Amp Kit

Crunch GP-1500.4 with Belva BAK44 Amp Kit

NVX Audio Upgrade Kit – QBSTA & Two Pair 6x9" Speakers

NVX Audio Upgrade Kit – QBSTA & Two Pair 6x9" Speakers

Rockford Fosgate P1000X1bd with Amplifier Wiring Kit

Rockford Fosgate P1000X1bd with Amplifier Wiring Kit

Diamond Audio HXM800.4D with NVX 8 Gauge Amp Kit

Diamond Audio HXM800.4D with NVX 8 Gauge Amp Kit

Kicker CXA1200.1 (46CXA12001T) with NVX 4 Gauge Amp Kit

Kicker CXA1200.1 (46CXA12001T) with NVX 4 Gauge Amp Kit

Kenwood KAC-9106D w/Belva 1.0 Farad Capacitor + Belva 2000 Watt Handling Amp Kit

Kenwood KAC-9106D w/Belva 1.0 Farad Capacitor + Belva 2000 Watt Handling Amp Kit

NVX VADM1 with Amplifier Wiring Kit

NVX VADM1 with Amplifier Wiring Kit

NVX VAD10004 with Amplifier Wiring Kit

NVX VAD10004 with Amplifier Wiring Kit

Kenwood KAC-D3104 with Amplifier Wiring Kit

Kenwood KAC-D3104 with Amplifier Wiring Kit

DS18 SXE-2000.4D/RD (Red) with Belva 4 Gauge Amp Kit

DS18 SXE-2000.4D/RD (Red) with Belva 4 Gauge Amp Kit

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