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 (135)

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 (72)

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 (195)

No (123)

Optional (77)

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 (65)

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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Kicker CWTB82 Subwoofer & CXA400.1 Amp w/ Bass Knob w/ Free Amp Install Kit

600W Peak Dual 8" Subwoofer Tube Enclosure, 400W RMS CX-Series Monoblock Amp, 8 Gauge Red Wiring Kit, NVX Foam Koozie, and Wired Bass Remote + Bundle

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Kicker CWTB82 Subwoofer & CXA400.1 Amp w/ Bass Knob w/ Free Amp Install Kit

600W Peak Dual 8" Subwoofer Tube Enclosure, 400W RMS CX-Series Monoblock Amp, 8 Gauge Red Wiring Kit, NVX Foam Koozie, and Wired Bass Remote + Bundle

Kicker CWTB82 600W Peak Loaded Dual 8-Inch Subwoofer and Passive Radiator Tube Enclosure
400W RMS Class D CX-Series Monoblock Car Amplifier
CXARC Wired Bass Remote Controller for CX Series Amplifiers
Belva BAK82 Red 8 Gauge Complete 2-Channel Amplifier Wiring Kit with RCA
NVX KOOZIE Premium Polyurethane Foam Can Insulator Sleeve

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Kicker CWTB82 600W Peak Loaded Dual 8-Inch Subwoofer and Passive Radiator Tube Enclosure
400W RMS Class D CX-Series Monoblock Car Amplifier
CXARC Wired Bass Remote Controller for CX Series Amplifiers
Belva BAK82 Red 8 Gauge Complete 2-Channel Amplifier Wiring Kit with RCA
NVX KOOZIE Premium Polyurethane Foam Can Insulator Sleeve

Kenwood eXcelon XM160-2 with NVX 8 Gauge Amp Kit

160W RMS eXcelon Series Class D 2-Channel Compact Amplifier for select 2014-up Harley-Davidson® motorcycles

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Kenwood eXcelon XM160-2 with NVX 8 Gauge Amp Kit

160W RMS eXcelon Series Class D 2-Channel Compact Amplifier for select 2014-up Harley-Davidson® motorcycles

• 80 watts x 2 channel @ 2 ohm
• Total RMS Power: 160 watts
• Class D 2 ohm Stable 2-Channel Amplifier
• Plug & Play Power, Speaker, & Input Wiring
• Includes Amplifier Wiring Kit

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• 80 watts x 2 channel @ 2 ohm
• Total RMS Power: 160 watts
• Class D 2 ohm Stable 2-Channel Amplifier
• Plug & Play Power, Speaker, & Input Wiring
• Includes Amplifier Wiring Kit

Kenwood KAC-D8105 with NVX 4 Gauge Amp Kit

1600 Watts Max Power 5-Channel Class D Amplifier

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Kenwood KAC-D8105 with NVX 4 Gauge Amp Kit

1600 Watts Max Power 5-Channel Class D Amplifier

• Kenwood KAC-D8105 5 Channel Amplifier
• Peak Power: 1600 watts
• 50 watts RMS x 4 + 300 watts at 4 Ohm
• 75 watts x4 + 500 watts at 2 Ohm
• Dimensions: 9"W x 2-3/16"H x 7-3/8"D

• Includes Amplifier Wiring Kit

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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

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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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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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DS18 FRP-2.5K/TI w/ NVX XKIT04

2500W RMS Class D FRP Series Monoblock Car Amplifier with Bass Remote w/ Full Spec 1/0 Gauge 100% (OFC) Oxygen Free Copper Complete 4-Channel Amplifier Wiring Kit

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DS18 FRP-2.5K/TI w/ NVX XKIT04

2500W RMS Class D FRP Series Monoblock Car Amplifier with Bass Remote w/ Full Spec 1/0 Gauge 100% (OFC) Oxygen Free Copper Complete 4-Channel Amplifier Wiring Kit

• 700 watts x 1 channel @ 4 ohm
• 1300 watts x 1 channel @ 2 ohm
• 2500 watts x 1 channel @ 1 ohm
• Total RMS Power: 2500 watts
• Class D 1 ohm Stable Monoblock Amplifier

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• 700 watts x 1 channel @ 4 ohm
• 1300 watts x 1 channel @ 2 ohm
• 2500 watts x 1 channel @ 1 ohm
• Total RMS Power: 2500 watts
• Class D 1 ohm Stable Monoblock Amplifier

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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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Pioneer GM-D9701 with Amplifier Wiring Kit

1200W RMS Class D Monoblock Amplifier w/ Wired Bass Boost Remote

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Pioneer GM-D9701 with Amplifier Wiring Kit

1200W RMS Class D Monoblock Amplifier w/ Wired Bass Boost Remote

• RMS: 500W x 1 @ 4 ohm, 800W x 1 @ 2 ohm, 1200W x 1 @ 1 ohm
• Total Peak Power: 2400W
• CEA-2006 Compliant
• Variable Bass Boost: 0 to +18 dB
• Class D Circuitry
• Includes Amplifier Wiring Kit
• Dimensions: 12-3/8"W x 7-7/8"D x 2-3/8"H

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Rockford Fosgate Power T1000-1bdCP + NVX XKIT42 4 Gauge Amp Wiring Kit

1000W RMS Power Series Constant Power Monoblock Class BD Amplifier

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Rockford Fosgate Power T1000-1bdCP + NVX XKIT42 4 Gauge Amp Wiring Kit

1000W RMS Power Series Constant Power Monoblock Class BD Amplifier

• RMS: 700W x 1 @ 4 ohm, 1000W x 1 @ 2 ohm, 1000W x 1 @ 1 ohm
• Total RMS Power: 1000W
• CEA-2006 Compliant
• Variable Bass Boost: 0 to +18 dB at 45 Hz
• Ultra Efficient Class bD Circuitry
• Dimensions: 13-11/16"L x 8-3/16"W x 2-3/16"H
• Includes NVX XKIT42 4 Gauge Amp Wiring Kit

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Rockford Fosgate R2-750X5 with Amplifier Wiring Kit

Rockford Fosgate Prime 600W 5-Channel Full Range Amplifier

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Rockford Fosgate R2-750X5 with Amplifier Wiring Kit

Rockford Fosgate Prime 600W 5-Channel Full Range Amplifier

• 50 Watts RMS x 4 @ 4 ohm
• 100 Watts RMS x 4 @ 2 ohm
• Total Peak Power: 600 Watts
• CEA-2006 Compliant
• Balanced Differential Inputs with RCA Pass Through Outputs
• Variable Infrasonic Filter
• Includes Amplifier Wiring Kit

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Rockford Fosgate M5-1000X1with NVX 8 Gauge Amp Kit

750W RMS M5-Series Class-BD Monoblock Marine Amplifier

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Rockford Fosgate M5-1000X1with NVX 8 Gauge Amp Kit

750W RMS M5-Series Class-BD Monoblock Marine Amplifier

• 500 watts x 1 channel @ 4 ohm
• 750 watts x 1 channel @ 2 ohm
• 1000 watts x 1 channel @ 1 ohm (Dynamic Power)
• Total RMS Power: 750 watts
• Class BD 1 ohm Stable Monoblock Amplifier
• 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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DS18 SXE-1200.4/BK (Black) with Belva 4 Gauge Amp Kit

1200W Peak (400W RMS) Class AB SXE Series 4-channel Car Amplifier

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DS18 SXE-1200.4/BK (Black) with Belva 4 Gauge Amp Kit

1200W Peak (400W RMS) Class AB SXE Series 4-channel Car Amplifier

• 60 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class A/B 2 ohm Stable 4-Channel-Channel Amplifier (Black)
• 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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Infinity Reference 6001A with Belva 8 Gauge Amp Kit

600W RMS Reference Series Class D Monoblock Amplifier with Remote Bass Knob

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Infinity Reference 6001A with Belva 8 Gauge Amp Kit

600W RMS Reference Series Class D Monoblock Amplifier with Remote Bass Knob

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

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

JVC KS-DR2004D with Belva 8 Gauge Amp Kit

600W Peak (150W RMS) DRVN Series Class-D 4-Channel Marine Amplifier

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JVC KS-DR2004D with Belva 8 Gauge Amp Kit

600W Peak (150W RMS) DRVN Series Class-D 4-Channel Marine Amplifier

• 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-Channel Amplifier
• Includes Amplifier Wiring Kit

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List price $378.79

-21% $299.00

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Massive Audio T2 with Belva 8 Gauge Amp Kit

1600W Peak (800W RMS) Trident Series Class D 1 Ohm Powersports Monoblock Amplifier

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Massive Audio T2 with Belva 8 Gauge Amp Kit

1600W Peak (800W RMS) Trident Series Class D 1 Ohm Powersports Monoblock Amplifier

• 200 watts x 1 channel @ 4 ohm
• 400 watts x 1 channel @ 2 ohm
• 800 watts x 1 channel @ 1 ohm
• Total RMS Power: 800 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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JBL Club A600 with NVX 8 Gauge Amp Kit

600W RMS Club Series Class-D Compact Monoblock Amplifier with Bass Remote

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JBL Club A600 with NVX 8 Gauge Amp Kit

600W RMS Club Series Class-D Compact Monoblock Amplifier with Bass Remote

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

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

JL Audio VX1000/1i with Amplifier Wiring Kit

1000W RMS VXi Series Class D Monoblock Amplifier with Built-In DSP

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JL Audio VX1000/1i with Amplifier Wiring Kit

1000W RMS VXi Series Class D Monoblock Amplifier with Built-In DSP

• 600 Watts RMS x 1 @ 4 ohm
• 800 Watts RMS x 1 @ 3 ohm
• 1000 Watts RMS x 1 @ 2 ohm
• Built-In Digital Signal Processor
• Adjustments Controlled Through TüN App
• Chassis Hides Mounting Hardware
• Includes Amplifier Wiring Kit

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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

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Car Amplifier Packages & Bundles for your 2005 A4 Quattro

Your Vehicle

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Kicker CWTB82 Subwoofer & CXA400.1 Amp w/ Bass Knob w/ Free Amp Install Kit

Kicker CWTB82 Subwoofer & CXA400.1 Amp w/ Bass Knob w/ Free Amp Install Kit

Kenwood eXcelon XM160-2 with NVX 8 Gauge Amp Kit

Kenwood eXcelon XM160-2 with NVX 8 Gauge Amp Kit

Kenwood KAC-D8105 with NVX 4 Gauge Amp Kit

Kenwood KAC-D8105 with NVX 4 Gauge Amp Kit

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

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

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

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

DS18 FRP-2.5K/TI w/ NVX XKIT04

DS18 FRP-2.5K/TI w/ NVX XKIT04

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

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

Pioneer GM-D9701 with Amplifier Wiring Kit

Pioneer GM-D9701 with Amplifier Wiring Kit

Rockford Fosgate Power T1000-1bdCP + NVX XKIT42 4 Gauge Amp Wiring Kit

Rockford Fosgate Power T1000-1bdCP + NVX XKIT42 4 Gauge Amp Wiring Kit

Rockford Fosgate R2-750X5 with Amplifier Wiring Kit

Rockford Fosgate R2-750X5 with Amplifier Wiring Kit

Rockford Fosgate M5-1000X1with NVX 8 Gauge Amp Kit

Rockford Fosgate M5-1000X1with NVX 8 Gauge Amp Kit

Alpine KTA-450 with NVX 8 Gauge Amp Kit

Alpine KTA-450 with NVX 8 Gauge Amp Kit

DS18 SXE-1200.4/BK (Black) with Belva 4 Gauge Amp Kit

DS18 SXE-1200.4/BK (Black) with Belva 4 Gauge Amp 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

Infinity Reference 6001A with Belva 8 Gauge Amp Kit

Infinity Reference 6001A with Belva 8 Gauge Amp Kit

JVC KS-DR2004D with Belva 8 Gauge Amp Kit

JVC KS-DR2004D with Belva 8 Gauge Amp Kit

Massive Audio T2 with Belva 8 Gauge Amp Kit

Massive Audio T2 with Belva 8 Gauge Amp Kit

JBL Club A600 with NVX 8 Gauge Amp Kit

JBL Club A600 with NVX 8 Gauge Amp Kit

JL Audio VX1000/1i with Amplifier Wiring Kit

JL Audio VX1000/1i with Amplifier Wiring Kit

Crunch GP-2000.4 with Belva 4 Gauge Amp Kit

Crunch GP-2000.4 with Belva 4 Gauge Amp Kit

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