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 (83)

500–999.99 watts (138)

1,000–1,499.99 watts (61)

1,500 watts or more (66)

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 (75)

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 (198)

No (124)

Optional (80)

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 (225)

No (73)

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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Alpine R-A90S with NVX 4 Gauge Amp Kit

R Series 6/5/4/3 Channel Power Amplifier

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Alpine R-A90S with NVX 4 Gauge Amp Kit

R Series 6/5/4/3 Channel Power Amplifier

• 75 watts x 4 channel + 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel + 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm + 100 watts x 4 channel @ 2 ohm
• Total RMS Power:
• CEA-2006 Compliant
• Class D 2 ohm Stable 5-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

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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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Rockford Fosgate Prime R500X1D Amplifier + 1.0 Farad Capacitor + 4 Gauge Amp Kit

500W RMS Prime Series Class D Monoblock Amplifier + 1.0 Farad Capacitor + 4 AWG Amp Kit

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Rockford Fosgate Prime R500X1D Amplifier + 1.0 Farad Capacitor + 4 Gauge Amp Kit

500W RMS Prime Series Class D Monoblock Amplifier + 1.0 Farad Capacitor + 4 AWG Amp Kit

• Rockford Fosgate R500X1D 500W RMS Prime Monoblock Amplifier
• Belva BAK42 Complete 4 Gauge 2-Channel Amplifier Installation Kit
• Belva BB1D 1.0 Farad Capacitor
• RMS: 500W x 1 @ 2 ohm
• Premium Power and Ground Wire Provides Optimal Power Transfer

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Rockford Fosgate Prime R2-500X4 + Belva BAK44 4 Gauge Amp Wiring Kit

Rockford Prime 500W 4-Channel Full Range Class D Amplifier + Belva BAK44

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Rockford Fosgate Prime R2-500X4 + Belva BAK44 4 Gauge Amp Wiring Kit

Rockford Prime 500W 4-Channel Full Range Class D Amplifier + Belva BAK44

• 75 Watts RMS x 4 @ 4 ohm
• 125 Watts RMS x 4 @ 2 ohm
• Total Peak Power: 500 Watts
• CEA-2006 Compliant
• Top Mounted Control Panel
• 1.9" x "6.8" x "10.1"

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• 75 Watts RMS x 4 @ 4 ohm
• 125 Watts RMS x 4 @ 2 ohm
• Total Peak Power: 500 Watts
• CEA-2006 Compliant
• Top Mounted Control Panel
• 1.9" x "6.8" x "10.1"

MB Quart FA2-1500.1 with Amplifier Wiring Kit

1500W RMS Formula Series Class-D Monoblock Car Amplifier

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MB Quart FA2-1500.1 with Amplifier Wiring Kit

1500W RMS Formula Series Class-D Monoblock Car Amplifier

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

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Hifonics HAC-1500.1D with Belva 1/0 Gauge Amp Kit

1500W Peak Colossus Pro Series Class-D Monoblock Amplifier with Bass Remote

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Hifonics HAC-1500.1D with Belva 1/0 Gauge Amp Kit

1500W Peak Colossus Pro Series Class-D Monoblock Amplifier with Bass Remote

• 1 x 375 @ 4 ohm
• 1 x 750 @ 2 ohm
• 1 x 1500 @ 1 ohm
• Total Peak Power: 1 x 1500
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 1 x 375 @ 4 ohm
• 1 x 750 @ 2 ohm
• 1 x 1500 @ 1 ohm
• Total Peak Power: 1 x 1500
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Rockford Fosgate T1000-4AD + Free NVX XFLOC4 Line-Output-Converter and Amp Kit

1000W 4-Channel Power Amplifier + NVX 4-Channel L.O.C + 4 Gauge Amp Kit

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Rockford Fosgate T1000-4AD + Free NVX XFLOC4 Line-Output-Converter and Amp Kit

1000W 4-Channel Power Amplifier + NVX 4-Channel L.O.C + 4 Gauge Amp Kit

• 1000W RMS
• 250W x 4-Chan @ 4 Ohm
• NOMAD Real Time Computer Protection
• 50-500 Hz LP/AP/HP Crossovers
• Constant Power

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• 1000W RMS
• 250W x 4-Chan @ 4 Ohm
• NOMAD Real Time Computer Protection
• 50-500 Hz LP/AP/HP Crossovers
• Constant Power

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

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NVX Audio Upgrade Kit – QB12SPA with 2 Pair 6x9" Speakers

1200W MAX (350W RMS) Single 12" Amplified Ported Sub Enclosure w/ Remote Bass Knob, 2 Pair 6x9" Coaxial Speakers, Amp Kit, Sound Damping, and Roller

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NVX Audio Upgrade Kit – QB12SPA with 2 Pair 6x9" Speakers

1200W MAX (350W RMS) Single 12" Amplified Ported Sub Enclosure w/ Remote Bass Knob, 2 Pair 6x9" Coaxial Speakers, Amp Kit, Sound Damping, and Roller

• 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 6x9(2) Co-axial Speaker and Damping Kits

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Diamond Audio HXM800.2D with NVX 4 Gauge Amp Kit

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

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Diamond Audio HXM800.2D with NVX 4 Gauge Amp Kit

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

• 300 watts x 2 channel @ 4 ohm
• 400 watts x 2 channel @ 2 ohm
• Bridged: 800 watts x 1 channel @ 4 ohm
• Total RMS Power: 800 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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Alpine R2-A75M with NVX 4 Gauge Amp Kit

750W RMS R-Series Class-D Monoblock Car Amplifier

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Alpine R2-A75M with NVX 4 Gauge Amp Kit

750W RMS R-Series Class-D Monoblock Car Amplifier

• 500 watts x 1 channel @ 4 ohm
• 750 watts x 1 channel @ 2 ohm
• Total RMS Power: 750 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 500 watts x 1 channel @ 4 ohm
• 750 watts x 1 channel @ 2 ohm
• Total RMS Power: 750 watts
• Class D 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

2 Kicker Subwoofers (CWTB82) + NVX Amplifier (VADM2v2) w/ Free Amp Install Kit

600W Peak Loaded Dual 8" Subwoofer and Passive Radiator Tube Enclosure with 600W RMS 2-Channel Amplifier and 8 Gauge Wiring Kit + Accessories

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2 Kicker Subwoofers (CWTB82) + NVX Amplifier (VADM2v2) w/ Free Amp Install Kit

600W Peak Loaded Dual 8" Subwoofer and Passive Radiator Tube Enclosure with 600W RMS 2-Channel Amplifier and 8 Gauge Wiring Kit + Accessories

Kicker CWTB82 600W Peak Loaded Dual 8 Inch Subwoofer and Passive Radiator Tube Enclosure
NVX VADM2 v2 600W RMS V-Series Micro Full-Range Class D 2-Channel Amplifier
XKIT82 Full Spec 8 Gauge 100% OFC Oxygen Free Copper Complete Amplifier Wiring Kit
KOOZIE Premium Polyurethane Foam Can Insulator Sleeve with Logo
Complete bundle includes Loaded Subwoofer Tube, 2-Channel Amplifier, and 8 AWG Install Kit

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Kicker CWTB82 600W Peak Loaded Dual 8 Inch Subwoofer and Passive Radiator Tube Enclosure
NVX VADM2 v2 600W RMS V-Series Micro Full-Range Class D 2-Channel Amplifier
XKIT82 Full Spec 8 Gauge 100% OFC Oxygen Free Copper Complete Amplifier Wiring Kit
KOOZIE Premium Polyurethane Foam Can Insulator Sleeve with Logo
Complete bundle includes Loaded Subwoofer Tube, 2-Channel Amplifier, and 8 AWG Install Kit

Kenwood eXcelon XM802-5 with Amplifier Wiring Kit

1600W Peak (800W RMS) Class D 5-Channel Car Audio Amplifier

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Kenwood eXcelon XM802-5 with Amplifier Wiring Kit

1600W Peak (800W RMS) Class D 5-Channel Car Audio Amplifier

• 75 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 75 watts x 4 channel + 500 watts x 1 channel @ 2 ohm
• Bridged: 150 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 800 watts
• CEA-2006 Compliant
• Class D 2 ohm Stable 5-Channel Amplifier
• Includes Amplifier Wiring Kit

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List price $739.99

-34% $490.99

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Rockford Fosgate Punch P500X2 + NVX XLCA2 Line-Output-Converter + Amp Kit

500W RMS 2-Channel Amplifier (P500X.2) + NVX 2-Channel L.O.C + 4 Gauge Amp Kit

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Rockford Fosgate Punch P500X2 + NVX XLCA2 Line-Output-Converter + Amp Kit

500W RMS 2-Channel Amplifier (P500X.2) + NVX 2-Channel L.O.C + 4 Gauge Amp Kit

• 150W x 2 Chan. @ 4 ohm
• 250W x 2 Chan. @ 2 ohm
• Built In NOMAD "Real Time" Analog Computer
• 2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• MESHA3 Reduces MOSFET Temperatures for Improved Durability

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Alpine R2-A150M with NVX 4 Gauge Amp Kit

1500W RMS R-Series Class D Monoblock Amplifier

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Alpine R2-A150M with NVX 4 Gauge Amp Kit

1500W RMS R-Series Class D Monoblock Amplifier

• 700 watts x 1 channel @ 4 ohm
• 1200 watts x 1 channel @ 2 ohm
• 1500 watts x 1 channel @ 1 ohm
• Total RMS Power: 1500 watts
• CEA-2006 Compliant
• Class D 1 ohm Stable Monoblock Amplifier

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NVX VAD11005 with Amplifier Wiring Kit

1100W Full Range Class D 5-Channel Car/Marine/Powersports Amplifier with Bass Remote

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NVX VAD11005 with Amplifier Wiring Kit

1100W Full Range Class D 5-Channel Car/Marine/Powersports Amplifier with Bass Remote

• 4 ohm: 80 watts x 4 chan. + 350 x 1 chan.
• 2 ohm: 125 watts x 4 chan. + 600 x 1 chan.
• Bridged, 4 ohm: 250 watts x 2 chan. + 600 x 1 chan.
• 5/4/2 Channel Operation
• Includes Amplifier Wiring Kit

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List price $599.98

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Audio Control LC-5.1300 with NVX 4 Gauge Amp Kit

1300w 5-channel summing amplifier + NVX XKIT46

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Audio Control LC-5.1300 with NVX 4 Gauge Amp Kit

1300w 5-channel summing amplifier + NVX XKIT46

• 5-Channel amplifier
• RMS Power: _125W x 4 @ 4 ohm, 200 W x 4 @ 2 ohm, 500W x 1 @ 2 ohm
• Select summing capabilities
• Eight speaker input

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• 5-Channel amplifier
• RMS Power: _125W x 4 @ 4 ohm, 200 W x 4 @ 2 ohm, 500W x 1 @ 2 ohm
• Select summing capabilities
• Eight speaker input

Deaf Bonce MLA-1500 with Belva 4 Gauge Amp Kit

1480W RMS Machete Series Class-D Monoblock Amplifier

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Deaf Bonce MLA-1500 with Belva 4 Gauge Amp Kit

1480W RMS Machete Series Class-D Monoblock Amplifier

• 540 watts x 1 channel @ 4 ohm
• 920 watts x 1 channel @ 2 ohm
• 1480 watts x 1 channel @ 1 ohm
• Total RMS Power: 1480 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Belva BAK42 4 Gauge Amp 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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Car Amplifier Packages & Bundles for your 2008 A6 Quattro

Your Vehicle

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

Shop the Category

Alpine R-A90S with NVX 4 Gauge Amp Kit

Alpine R-A90S 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

Rockford Fosgate Prime R500X1D Amplifier + 1.0 Farad Capacitor + 4 Gauge Amp Kit

Rockford Fosgate Prime R500X1D Amplifier + 1.0 Farad Capacitor + 4 Gauge Amp Kit

Rockford Fosgate Prime R2-500X4 + Belva BAK44 4 Gauge Amp Wiring Kit

Rockford Fosgate Prime R2-500X4 + Belva BAK44 4 Gauge Amp Wiring Kit

MB Quart FA2-1500.1 with Amplifier Wiring Kit

MB Quart FA2-1500.1 with Amplifier Wiring Kit

Hifonics HAC-1500.1D with Belva 1/0 Gauge Amp Kit

Hifonics HAC-1500.1D with Belva 1/0 Gauge Amp Kit

Rockford Fosgate T1000-4AD + Free NVX XFLOC4 Line-Output-Converter and Amp Kit

Rockford Fosgate T1000-4AD + Free NVX XFLOC4 Line-Output-Converter and Amp Kit

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

NVX Audio Upgrade Kit – QB12SPA with 2 Pair 6x9" Speakers

NVX Audio Upgrade Kit – QB12SPA with 2 Pair 6x9" Speakers

Diamond Audio HXM800.2D with NVX 4 Gauge Amp Kit

Diamond Audio HXM800.2D with NVX 4 Gauge Amp Kit

Alpine R2-A75M with NVX 4 Gauge Amp Kit

Alpine R2-A75M with NVX 4 Gauge Amp Kit

NVX QB12SPA with Free BAK82BL Amp Kit

NVX QB12SPA with Free BAK82BL Amp Kit

2 Kicker Subwoofers (CWTB82) + NVX Amplifier (VADM2v2) w/ Free Amp Install Kit

2 Kicker Subwoofers (CWTB82) + NVX Amplifier (VADM2v2) w/ Free Amp Install Kit

Kenwood eXcelon XM802-5 with Amplifier Wiring Kit

Kenwood eXcelon XM802-5 with Amplifier Wiring Kit

Rockford Fosgate Punch P500X2 + NVX XLCA2 Line-Output-Converter + Amp Kit

Rockford Fosgate Punch P500X2 + NVX XLCA2 Line-Output-Converter + Amp Kit

Alpine R2-A150M with NVX 4 Gauge Amp Kit

Alpine R2-A150M with NVX 4 Gauge Amp Kit

NVX VAD11005 with Amplifier Wiring Kit

NVX VAD11005 with Amplifier Wiring Kit

Audio Control LC-5.1300 with NVX 4 Gauge Amp Kit

Audio Control LC-5.1300 with NVX 4 Gauge Amp Kit

Deaf Bonce MLA-1500 with Belva 4 Gauge Amp Kit

Deaf Bonce MLA-1500 with Belva 4 Gauge Amp Kit

Alpine KTA-450 with NVX 8 Gauge Amp Kit

Alpine KTA-450 with NVX 8 Gauge Amp Kit

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