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 (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 (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 (198)

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 (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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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

NVX 6.5" Pro Midrange Speakers with Installation Kit

Includes NVX 6.5" V-Series Pro Midrange Speakers, Baffle, Premium Sound Damping, Rubber Roller, Installer's Panel Removal Kit

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NVX 6.5" Pro Midrange Speakers with Installation Kit

Includes NVX 6.5" V-Series Pro Midrange Speakers, Baffle, Premium Sound Damping, Rubber Roller, Installer's Panel Removal Kit

•225 watts RMS
•1" Aluminum Dome Bullet Tweeter
• Treated Paper cone material
• Impedance: 4 ohm
• Sensitivity: 97 dB

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•225 watts RMS
•1" Aluminum Dome Bullet Tweeter
• Treated Paper cone material
• Impedance: 4 ohm
• Sensitivity: 97 dB

DS18 ION1000.4D with Belva 4 Gauge Amp Kit

3000W Peak (1000W RMS) Class D ION Series 4 Channel Car Amplifier

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DS18 ION1000.4D with Belva 4 Gauge Amp Kit

3000W Peak (1000W RMS) Class D ION Series 4 Channel Car Amplifier

• 150 watts x 4 channel @ 4 ohm
• 250 watts x 4 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 1000 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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JBL DSP4086 (DSP 4086) + Amp Kit

8-Channel Class D Amplifier Design with Digital Signal Processing + NVX Premium 8 Gauge Amp Wiring Kit

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JBL DSP4086 (DSP 4086) + Amp Kit

8-Channel Class D Amplifier Design with Digital Signal Processing + NVX Premium 8 Gauge Amp Wiring Kit

• 40 Watts RMS x 8 @ 4 ohm
• 60 Watts RMS x 8 @ 2 ohm
• Total Peak Power: 1000 Watts
• CEA-2006 Compliant
• Frequency Response:10Hz to 22kHz

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• 40 Watts RMS x 8 @ 4 ohm
• 60 Watts RMS x 8 @ 2 ohm
• Total Peak Power: 1000 Watts
• CEA-2006 Compliant
• Frequency Response:10Hz to 22kHz

DS18 SMD-300.4AB 4-Channel Amplifier + NVX Amp Kit

1200W RMS Class AB SMD Series 4-Ch Amplifier with Bass Remote and 4 Gauge 100% OFC Complete 4-Channel Amplifier Wiring Kit with RCA

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DS18 SMD-300.4AB 4-Channel Amplifier + NVX Amp Kit

1200W RMS Class AB SMD Series 4-Ch Amplifier with Bass Remote and 4 Gauge 100% OFC Complete 4-Channel Amplifier Wiring Kit with RCA

DS18 SMD-300.4AB 1200W RMS Class AB 4-Channel Car Amplifier
Wired Bass Remote for Precision Level Control
NVX XKIT44 Full Spec 4 Gauge 100% OFC Wiring Kit
Complete 4-Channel Copper Installation Solution with RCA
High-Performance Setup for Amplifiers up to 1500 Watts

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DS18 SMD-300.4AB 1200W RMS Class AB 4-Channel Car Amplifier
Wired Bass Remote for Precision Level Control
NVX XKIT44 Full Spec 4 Gauge 100% OFC Wiring Kit
Complete 4-Channel Copper Installation Solution with RCA
High-Performance Setup for Amplifiers up to 1500 Watts

Alpine S2-A55V with Belva 4 Gauge Amp Kit

540W RMS S-Series Class-D 5-Channel Car Amplifier

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Alpine S2-A55V with Belva 4 Gauge Amp Kit

540W RMS S-Series Class-D 5-Channel Car Amplifier

• 40 watts x 4 channel + 200 watts x 1 channel @ 4 ohm
• 60 watts x 4 channel + 300 watts x 1 channel @ 2 ohm
• Bridged: 120 watts x 2 channel @ 4 ohm + 300 watts x 1 channel @ 2 ohm
• Total RMS Power: 540 watts
• CEA-2006 Compliant
• Class D 2 ohm Stable 5-Channel Amplifier

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Rockford Fosgate Power T600-4 + NVX XKIT44 4 Gauge Amp Wiring Kit

600W Power Series Compact 4-Channel Class AB Car Amplifier

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Rockford Fosgate Power T600-4 + NVX XKIT44 4 Gauge Amp Wiring Kit

600W Power Series Compact 4-Channel Class AB Car Amplifier

• 100W x 4-Chan. @ 4 ohm
• 150W x 4-Chan. @ 2 ohm
• 300W x 2 chan. @ 4 ohm
• 600W x 4-Chan. Max
• NOMAD protection circuitry: thermal, overload or short protection
• MOSFET power supply
• Includes NVX XKIT44 4 Gauge Amp Wiring Kit

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Belva BB200ABv2 with Belva 8 Gauge Amp Kit

500W Peak Class A/B Monoblock Amplifier

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Belva BB200ABv2 with Belva 8 Gauge Amp Kit

500W Peak Class A/B Monoblock Amplifier

• Class A/B Monoblock Amplifier
• Adjustable Gain Controls
• Low-Pass Filter: 40-300Hz
• Bass Boost: +0-12DB
• One pair of preamp outputs
• Includes Remote bass knob
• Includes Amplifier Wiring Kit

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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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Rockford Fosgate R2-200X2 + Belva BAK42 4 Gauge Amp Kit

Prime Series 200W RMS Class D 2-Channel Amplifier + Belva 4 Gauge Wiring Kit

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Rockford Fosgate R2-200X2 + Belva BAK42 4 Gauge Amp Kit

Prime Series 200W RMS Class D 2-Channel Amplifier + Belva 4 Gauge Wiring Kit

• 50 Watts RMS x 2 @ 4 ohm
• 100 Watts RMS x 2 @ 2 ohm
• 200 Watts RMS x 1 Bridged @ 4 ohm
• CEA-2006 Compliant/Preamp Outputs/LPF
• On Board Punch EQ

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• 50 Watts RMS x 2 @ 4 ohm
• 100 Watts RMS x 2 @ 2 ohm
• 200 Watts RMS x 1 Bridged @ 4 ohm
• CEA-2006 Compliant/Preamp Outputs/LPF
• On Board Punch EQ

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"

DS18 SXE-3000.4D/RD with Amplifier Wiring Kit

1000W RMS SXE Series Class-D 4-Channel Amplifier

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DS18 SXE-3000.4D/RD with Amplifier Wiring Kit

1000W RMS SXE Series Class-D 4-Channel Amplifier

• 200 watts x 4 channel @ 4 ohm
• 320 watts x 4 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 1000 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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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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NVX 6x9" Component Speakers with Installation Kit

Includes NVX 6x9" N-Series Component Speakers, Baffle, Premium Sound Damping, Rubber Roller, Installer's Panel Removal Kit

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NVX 6x9" Component Speakers with Installation Kit

Includes NVX 6x9" N-Series Component Speakers, Baffle, Premium Sound Damping, Rubber Roller, Installer's Panel Removal Kit

• 460 watts Peak Each, 160 watts RMS Each
• 3/4" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 89 dB
• Mounting Depth: 2.95"

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• 460 watts Peak Each, 160 watts RMS Each
• 3/4" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 89 dB
• Mounting Depth: 2.95"

Pioneer GM-DX975 with Amplifier Wiring Kit

2000 Watts Class D 5-Channel Amplifier w/ Gold-plated RCA Terminals and Bass Boost Remote

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Pioneer GM-DX975 with Amplifier Wiring Kit

2000 Watts Class D 5-Channel Amplifier w/ Gold-plated RCA Terminals and Bass Boost Remote

• 75 Watts RMS x 4 @ 4 ohm + 350 watts RMS x 1
• 100 Watts RMS x 1 @ 2 ohm + 600 watts RMS x 1
• 1200 Watts RMS x 1 @ 1 ohm
• 5-channel operation
• CEA-2006 Compliant/Preamp Outputs/LPF
• HQ Sound Parts
• Gold-plated RCA connections
• Includes Amplifier Wiring Kit
• 12-7/16"W x 2"H x 7-7/8"D

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-26% $549.99

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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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-25% $461.99

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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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List price $665.98

-25% $498.60

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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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List price $955.99

-27% $699.99

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Kenwood KAC-M5024BT with NVX 8 Gauge Amp Kit

300W RMS KAC Series Class-D 4-Channel Marine Amplifier With Bluetooth® Connectivity

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Kenwood KAC-M5024BT with NVX 8 Gauge Amp Kit

300W RMS KAC Series Class-D 4-Channel Marine Amplifier With Bluetooth® Connectivity

• 50 watts x 4 channel @ 4 ohm
• 75 watts x 4 channel @ 2 ohm
• Bridged: 150 watts x 2 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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List price $547.99

-21% $434.99

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Belva BXA5002 with Belva 8 Gauge Amp kit

250W Max Class AB 2-Ohm Stable 2-Channel Amplifier Package

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Belva BXA5002 with Belva 8 Gauge Amp kit

250W Max Class AB 2-Ohm Stable 2-Channel Amplifier Package

• 125 watts x 2 channel @ 4 ohm
• 250 watts x 2 channel @ 2 ohm
• Total Peak Power: 500 watts
• Class A/B 2 ohm Stable 2-Channel-Channel
• Includes Amplifier Wiring Kit

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List price $239.94

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• 125 watts x 2 channel @ 4 ohm
• 250 watts x 2 channel @ 2 ohm
• Total Peak Power: 500 watts
• Class A/B 2 ohm Stable 2-Channel-Channel
• Includes Amplifier Wiring Kit

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Car Amplifier Packages & Bundles for your 2019 A4 Quattro

Your Vehicle

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

Shop the Category

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

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

NVX 6.5" Pro Midrange Speakers with Installation Kit

NVX 6.5" Pro Midrange Speakers with Installation Kit

DS18 ION1000.4D with Belva 4 Gauge Amp Kit

DS18 ION1000.4D with Belva 4 Gauge Amp Kit

JBL DSP4086 (DSP 4086) + Amp Kit

JBL DSP4086 (DSP 4086) + Amp Kit

DS18 SMD-300.4AB 4-Channel Amplifier + NVX Amp Kit

DS18 SMD-300.4AB 4-Channel Amplifier + NVX Amp Kit

Alpine S2-A55V with Belva 4 Gauge Amp Kit

Alpine S2-A55V with Belva 4 Gauge Amp Kit

Rockford Fosgate Power T600-4 + NVX XKIT44 4 Gauge Amp Wiring Kit

Rockford Fosgate Power T600-4 + NVX XKIT44 4 Gauge Amp Wiring Kit

Belva BB200ABv2 with Belva 8 Gauge Amp Kit

Belva BB200ABv2 with Belva 8 Gauge Amp Kit

NVX VADM1 with Amplifier Wiring Kit

NVX VADM1 with Amplifier Wiring Kit

Rockford Fosgate R2-200X2 + Belva BAK42 4 Gauge Amp Kit

Rockford Fosgate R2-200X2 + Belva BAK42 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

DS18 SXE-3000.4D/RD with Amplifier Wiring Kit

DS18 SXE-3000.4D/RD with Amplifier Wiring Kit

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

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

NVX 6x9" Component Speakers with Installation Kit

NVX 6x9" Component Speakers with Installation Kit

Pioneer GM-DX975 with Amplifier Wiring Kit

Pioneer GM-DX975 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

Rockford Fosgate Punch P600X4 with Amplifier Wiring Kit

Rockford Fosgate Punch P600X4 with Amplifier Wiring Kit

Hertz SP 4.900 with NVX 4 Gauge Amp Kit

Hertz SP 4.900 with NVX 4 Gauge Amp Kit

Kenwood KAC-M5024BT with NVX 8 Gauge Amp Kit

Kenwood KAC-M5024BT with NVX 8 Gauge Amp Kit

Belva BXA5002 with Belva 8 Gauge Amp kit

Belva BXA5002 with Belva 8 Gauge Amp kit

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