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 (137)

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 (74)

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 (197)

No (123)

Optional (79)

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 (67)

Yes - with included adapter (19)

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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2009 S4

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JL Audio JD250/1 with Belva 8 Gauge Amp Kit

250W RMS JD Series Class-D Monoblock Amplifier

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JL Audio JD250/1 with Belva 8 Gauge Amp Kit

250W RMS JD Series Class-D Monoblock Amplifier

• 150 watts x 1 channel @ 4 ohm
• 250 watts x 1 channel @ 2 ohm
• Total RMS Power: 250 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 150 watts x 1 channel @ 4 ohm
• 250 watts x 1 channel @ 2 ohm
• Total RMS Power: 250 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Cerwin-Vega H800.4D with NVX 4 Gauge Amp Kit

400W Full Range Class D 4 Channel Digital Amplifier

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Cerwin-Vega H800.4D with NVX 4 Gauge Amp Kit

400W Full Range Class D 4 Channel Digital Amplifier

• 125 watts x 4 channel Watts RMS x 1 @ 4 ohm
• 200 watts x 4 channel Watts RMS x 1 @ 2 ohm
• Bridged: 400 watts x 2 channel @ 4 ohm
• Total RMS Power: 1600 watts Watts
• Multi-Turn On Modes: REM/DC/VOX
• Includes Amplifier Wiring Kit

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DS18 ZR1500.1D with NVX 4 Gauge Amp Kit

4500W RMS ZR Series Class-D Monoblock Amplifier

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DS18 ZR1500.1D with NVX 4 Gauge Amp Kit

4500W RMS ZR Series Class-D Monoblock Amplifier

• 550 watts x 1 channel @ 4 ohm
• 950 watts x 1 channel @ 2 ohm
• 1500 watts x 1 channel @ 1 ohm
• Total RMS Power: 4500 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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Hertz SP 4.900 with NVX 4 Gauge Amp Kit

900W RMS SPL Show Series Class-D 4-channel Amplifier

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Hertz SP 4.900 with NVX 4 Gauge Amp Kit

900W RMS SPL Show Series Class-D 4-channel Amplifier

• 160 watts x 4 channel @ 4 ohm
• 250 watts x 4 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 900 watts
• CEA-2006 Compliant
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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NVX XQA12001 with Amp Wiring Kit

1200W RMS 1-Ohm Stable Monoblock Amplifier + NVX 4 Gauge Amp Wiring Kit

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NVX XQA12001 with Amp Wiring Kit

1200W RMS 1-Ohm Stable Monoblock Amplifier + NVX 4 Gauge Amp Wiring Kit

• 500 watts x 1 channel @ 4 ohm
• 800 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

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• 500 watts x 1 channel @ 4 ohm
• 800 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

NVX VAD10001 v2 Amp, XKIT42 2-Channel Amplifier Wiring Kit

2000W Peak (1000W RMS) Class D Monoblock Car/Marine/Powersports Amplifier and Full Spec 4 Gauge 100% OFC 2-Channel Amplifier Wiring Kit

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NVX VAD10001 v2 Amp, XKIT42 2-Channel Amplifier Wiring Kit

2000W Peak (1000W RMS) Class D Monoblock Car/Marine/Powersports Amplifier and Full Spec 4 Gauge 100% OFC 2-Channel Amplifier Wiring Kit

NVX VAD10001 v2 2000W Peak Class D Monoblock Amplifier
Marine Certified for Car, Marine, and Powersports Use
Includes Wired Bass Remote for Precision Control
XKIT42 Full Spec 4 Gauge 100% OFC Wiring Kit
Complete 2-Channel Installation Solution with RCA Cables

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NVX VAD10001 v2 2000W Peak Class D Monoblock Amplifier
Marine Certified for Car, Marine, and Powersports Use
Includes Wired Bass Remote for Precision Control
XKIT42 Full Spec 4 Gauge 100% OFC Wiring Kit
Complete 2-Channel Installation Solution with RCA Cables

Crunch GP-2000.4 with Belva 4 Gauge Amp Kit

Crunch 2000 Watts Ground Pounder Four Channel Car Audio Amplifier

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Crunch GP-2000.4 with Belva 4 Gauge Amp Kit

Crunch 2000 Watts Ground Pounder Four Channel Car Audio Amplifier

• Variable Electronic Crossover
• Class A/B Amplifier
• Switchable Bass Boost
• Includes Belva BAK44 4 Gauge Amp Wiring Kit

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• Variable Electronic Crossover
• Class A/B Amplifier
• Switchable Bass Boost
• Includes Belva BAK44 4 Gauge Amp Wiring Kit

Crunch DR-1325.1 with Belva 8 Gauge Amp Kit

1325W Peak Class AB V-Drive Series Monoblock Car Subwoofer Amplifier with Bass Remote

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Crunch DR-1325.1 with Belva 8 Gauge Amp Kit

1325W Peak Class AB V-Drive Series Monoblock Car Subwoofer Amplifier with Bass Remote

• 650 watts x 1 channel @ 4 ohm
• 1325 watts x 1 channel @ 2 ohm
• Total peak power output: 1325 watts
• Class A/B 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 650 watts x 1 channel @ 4 ohm
• 1325 watts x 1 channel @ 2 ohm
• Total peak power output: 1325 watts
• Class A/B 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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NVX QB12SPA with Free BAK82BL Amp Kit

1200W MAX (350W RMS) Single 12" Amplified Ported Loaded Subwoofer Enclosure with Remote Bass Knob + with 8 Gauge Premium (CCA) Complete 2-Channel Amplifier Wiring Kit

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NVX QB12SPA with Free BAK82BL Amp Kit

1200W MAX (350W RMS) Single 12" Amplified Ported Loaded Subwoofer Enclosure with Remote Bass Knob + with 8 Gauge Premium (CCA) Complete 2-Channel Amplifier Wiring Kit

• 12" Amplified Loaded Subwoofer System
• 350 watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost
• Speaker-Level Inputs
• Wired Remote Bass Level Control
• Includes Amp Kit

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• 12" Amplified Loaded Subwoofer System
• 350 watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost
• Speaker-Level Inputs
• Wired Remote Bass Level Control
• Includes Amp Kit

DS18 ZR2000.1D w/ NVX XKIT04

6000W Peak (2000W RMS) Class D ZR Series Monoblock Car Amplifier w/ Full Spec 1/0 Gauge 100% (OFC) Oxygen Free Copper Complete 4-Channel Amplifier Wiring Kit

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DS18 ZR2000.1D w/ NVX XKIT04

6000W Peak (2000W RMS) Class D ZR Series Monoblock Car Amplifier w/ Full Spec 1/0 Gauge 100% (OFC) Oxygen Free Copper Complete 4-Channel Amplifier Wiring Kit

• 800 watts x 1 channel @ 4 ohm
• 1300 watts x 1 channel @ 2 ohm
• 2000 watts x 1 channel @ 1 ohm
• Total RMS Power: 2000 watts
• Class D 1 ohm Stable Monoblock Amplifier

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• 800 watts x 1 channel @ 4 ohm
• 1300 watts x 1 channel @ 2 ohm
• 2000 watts x 1 channel @ 1 ohm
• Total RMS Power: 2000 watts
• Class D 1 ohm Stable Monoblock Amplifier

Rockford Fosgate R2-500X1 with R2-2X10

Prime Series Class-D Monoblock Amplifier with Dual 2 Ohm 10" Sealed Loaded Enclosure

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Rockford Fosgate R2-500X1 with R2-2X10

Prime Series Class-D Monoblock Amplifier with Dual 2 Ohm 10" Sealed Loaded Enclosure

• 300 Watts RMS x 1 @ 4 ohm
• 500 Watts RMS x 1 @ 2 ohm
• Top Mounted Control Panel Class-D Amplifier
• Top Mounted Control Panel Class-D Amplifier
• Covered with High Density Carpet
• Dimensions: 12.2" H x 30.12" W x 7.14" D

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Rockford Fosgate Punch P1000X1bd with Amplifier Wiring Kit

1000W RMS Punch Series Monoblock Class BD Car Power Amplifier

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Rockford Fosgate Punch 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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Kicker 49L7TDF82 + NVX VADM1 v2 w/ Free Amp Install Kit

700W Peak Loaded Single 8 inch Sealed Subwoofer Enclosure with 600W RMS Class D Monoblock Amplifier, 8 Gauge OFC Wiring Kit, and Koozie + Bundle

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Kicker 49L7TDF82 + NVX VADM1 v2 w/ Free Amp Install Kit

700W Peak Loaded Single 8 inch Sealed Subwoofer Enclosure with 600W RMS Class D Monoblock Amplifier, 8 Gauge OFC Wiring Kit, and Koozie + Bundle

Kicker 700W Peak Loaded Single 8-Inch Sealed Subwoofer Enclosure
600W RMS Class D Monoblock Car and Marine Amplifier with Bass Remote
Full Spec 8 Gauge 100-Percent OFC 2-Channel Wiring Kit with RCA
Premium Polyurethane Foam Can Insulator Sleeve Koozie
Complete audio upgrade package includes amplifier and wiring kit

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-28% $490.01

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Kicker 700W Peak Loaded Single 8-Inch Sealed Subwoofer Enclosure
600W RMS Class D Monoblock Car and Marine Amplifier with Bass Remote
Full Spec 8 Gauge 100-Percent OFC 2-Channel Wiring Kit with RCA
Premium Polyurethane Foam Can Insulator Sleeve Koozie
Complete audio upgrade package includes amplifier and wiring kit

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Rockford Fosgate Punch P600X4 with Amplifier Wiring Kit

600W Punch Series 4-Channel Stereo Class AB Car Power Amplifier

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Rockford Fosgate Punch P600X4 with Amplifier Wiring Kit

600W Punch Series 4-Channel Stereo Class AB Car Power Amplifier

• 75W x 4-Chan. @ 4 ohm
• 150W x 4-Chan. @ 2 ohm
• Built In NOMAD "Real Time" Analog Computer
• 4/3/2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• MESHA3 Reduces MOSFET Temperatures for Improved Durability

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DS18 ION1600.4D with NVX 4 Gauge Amp Kit

4800W Peak (1600W RMS) Class D ION Series 4 Channel Car Amplifier

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DS18 ION1600.4D with NVX 4 Gauge Amp Kit

4800W Peak (1600W RMS) Class D ION Series 4 Channel Car Amplifier

• 240 watts x 4 channel @ 4 ohm
• 400 watts x 4 channel @ 2 ohm
• Bridged: 800 watts x 2 channel @ 4 ohm
• Total RMS Power: 1600 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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List price $575.94

-12% $505.36

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Rockford Fosgate Power T750X1bd + NVX XKIT42

750W Power Series Ultra Compact Class-BD Monoblock Amplifier + NVX 4 Gauge Amp Wiring Kit

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Rockford Fosgate Power T750X1bd + NVX XKIT42

750W Power Series Ultra Compact Class-BD Monoblock Amplifier + NVX 4 Gauge Amp Wiring Kit

• 500 Watts RMS x 1 @ 4 ohm
• 750 Watts RMS x 1 @ 2 ohm
• 750 Watts RMS x 1 @ 1 ohm
• Total Peak Power: 1500 Watts
• CEA-2006 Compliant
• C.L.E.A.N. input/output clip detection and indicator LEDs
• Dual extruded heat sinks
• C.L.E.A.N. input/output clip detection and indicator LEDs
• Real time thermal sensing with Rollback technology
• Dimensions: 4.3"W x 8.3"L x 1.6"H

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Sundown Audio SAV312D4 + NVX XCA3K

1 pair of 3000W Peak (1500W RMS) 12" SA Series Dual 4-ohm Subwoofer with Monoblock Amplifier with LED Remote Bass Knob

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Sundown Audio SAV312D4 + NVX XCA3K

1 pair of 3000W Peak (1500W RMS) 12" SA Series Dual 4-ohm Subwoofer with Monoblock Amplifier with LED Remote Bass Knob

• Peak Power: 3000 watts
• RMS Power: 1500 watts
• Impedance: Dual 4 ohm
• Competition-grade Paper cone
• Durable Foam surround
• Mount depth: 8.4"
• Sensitivity: 84.05 dB

• Includes 1 pair of Subwoofer with amplifier

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-30% $1,487.62

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18-23 Wrangler JL / 20-23 Gladiator JT Kicker Plug & Play 5-Channel Amp & Sub

1000W Peak (500W RMS) Loaded Dual 12" Sealed Truck Enclosure

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18-23 Wrangler JL / 20-23 Gladiator JT Kicker Plug & Play 5-Channel Amp & Sub

1000W Peak (500W RMS) Loaded Dual 12" Sealed Truck Enclosure

• Sealed truck enclosure with 2 12" CompRT Series Subwoofer • 250-500 watts RMS Power Rating • Final Impedance: 2-ohm • Dimensions: 27 1/2" L x 6 1/8" H x 14 5/8" W

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• Sealed truck enclosure with 2 12" CompRT Series Subwoofer • 250-500 watts RMS Power Rating • Final Impedance: 2-ohm • Dimensions: 27 1/2" L x 6 1/8" H x 14 5/8" W

Cerwin Vega B54 with Belva 4 Gauge Amp Kit

1200W 4-Channel Bomber Series Class D Amplifier with 4 Gauge Amp Kit

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Cerwin Vega B54 with Belva 4 Gauge Amp Kit

1200W 4-Channel Bomber Series Class D Amplifier with 4 Gauge Amp Kit

• RMS: 80 Watts x 4 @ 4 ohm, 150 Watts x 4 @ 2 ohm, Bridged: 300 Watts x 2 @ 4 ohm
• Total Peak Power: 1000 Watts
• Class D IR Chipset with DirectFET Power Mosfet Output
• Wired remote bass level control included
• Ultra Compact High Density Aluminum Alloy Chassis
• Dimensions: 4.02" W x 8.70" L x 1.40" H

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List price $511.98

-30% $359.99

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Deaf Bonce MFA 4.180 with Belva 4 Gauge Amp Kit

1080W RMS Machete Series Class D 4-Channel Car Amplifier

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Deaf Bonce MFA 4.180 with Belva 4 Gauge Amp Kit

1080W RMS Machete Series Class D 4-Channel Car Amplifier

• 180 watts x 4 channel @ 4 ohm
• 270 watts x 4 channel @ 2 ohm
• Bridged: 540 watts x 2 channel @ 4 ohm
• Total RMS Power: 1080 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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-13% $294.89

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Car Amplifier Packages & Bundles for your 2009 S4

Your Vehicle

Product results for your vehicle – confirm details to verify fitment.

Shop the Category

JL Audio JD250/1 with Belva 8 Gauge Amp Kit

JL Audio JD250/1 with Belva 8 Gauge Amp Kit

Cerwin-Vega H800.4D with NVX 4 Gauge Amp Kit

Cerwin-Vega H800.4D with NVX 4 Gauge Amp Kit

DS18 ZR1500.1D with NVX 4 Gauge Amp Kit

DS18 ZR1500.1D with NVX 4 Gauge Amp Kit

Hertz SP 4.900 with NVX 4 Gauge Amp Kit

Hertz SP 4.900 with NVX 4 Gauge Amp Kit

NVX XQA12001 with Amp Wiring Kit

NVX XQA12001 with Amp Wiring Kit

NVX VAD10001 v2 Amp, XKIT42 2-Channel Amplifier Wiring Kit

NVX VAD10001 v2 Amp, XKIT42 2-Channel Amplifier Wiring Kit

Crunch GP-2000.4 with Belva 4 Gauge Amp Kit

Crunch GP-2000.4 with Belva 4 Gauge Amp Kit

Crunch DR-1325.1 with Belva 8 Gauge Amp Kit

Crunch DR-1325.1 with Belva 8 Gauge Amp Kit

NVX QB12SPA with Free BAK82BL Amp Kit

NVX QB12SPA with Free BAK82BL Amp Kit

DS18 ZR2000.1D w/ NVX XKIT04

DS18 ZR2000.1D w/ NVX XKIT04

Rockford Fosgate R2-500X1 with R2-2X10

Rockford Fosgate R2-500X1 with R2-2X10

Rockford Fosgate Punch P1000X1bd with Amplifier Wiring Kit

Rockford Fosgate Punch P1000X1bd with Amplifier Wiring Kit

Kicker 49L7TDF82 + NVX VADM1 v2 w/ Free Amp Install Kit

Kicker 49L7TDF82 + NVX VADM1 v2 w/ Free Amp Install Kit

Rockford Fosgate Punch P600X4 with Amplifier Wiring Kit

Rockford Fosgate Punch P600X4 with Amplifier Wiring Kit

DS18 ION1600.4D with NVX 4 Gauge Amp Kit

DS18 ION1600.4D with NVX 4 Gauge Amp Kit

Rockford Fosgate Power T750X1bd + NVX XKIT42

Rockford Fosgate Power T750X1bd + NVX XKIT42

Sundown Audio SAV312D4 + NVX XCA3K

Sundown Audio SAV312D4 + NVX XCA3K

18-23 Wrangler JL / 20-23 Gladiator JT Kicker Plug & Play 5-Channel Amp & Sub

18-23 Wrangler JL / 20-23 Gladiator JT Kicker Plug & Play 5-Channel Amp & Sub

Cerwin Vega B54 with Belva 4 Gauge Amp Kit

Cerwin Vega B54 with Belva 4 Gauge Amp Kit

Deaf Bonce MFA 4.180 with Belva 4 Gauge Amp Kit

Deaf Bonce MFA 4.180 with Belva 4 Gauge Amp Kit

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