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 (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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1989 635CSi

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Wet Sounds SYN-DX 4 with NVX 4 Gauge Amp Kit

800W RMS DX-Series Bridgeable Full-Range 4-Channel Marine Amplifier

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Wet Sounds SYN-DX 4 with NVX 4 Gauge Amp Kit

800W RMS DX-Series Bridgeable Full-Range 4-Channel Marine Amplifier

• 125 Watts RMS x 4 @ 4 ohm
• 200 Watts RMS x 4 @ 2 ohm
• 400 Watts RMS x 2 @ 4 ohm
• Total RMS Power: 800 Watts
• Frequency Response: 20 - 20000 Hz
• Variable high-pass filter: 50 - 250 Hz, 12 dB/octave
• Variable low-pass filter: 50 - 250 Hz, 12 dB/octave
• Fuse Rating: 30 A x 2
• Includes Amplifier Wiring Kit

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Wet Sounds SDX-6 with NVX 4 Gauge Amp Kit

1755 Watt Sinister Series Full Range 6-Channel Class D Amplifier (WetSounds)

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Wet Sounds SDX-6 with NVX 4 Gauge Amp Kit

1755 Watt Sinister Series Full Range 6-Channel Class D Amplifier (WetSounds)

• RMS: 185W x 6 @ 4 ohm, 290W x 6 @ 2 ohm, Bridged: 585W x 3 @ 4 ohm
• Total RMS Power: 1755 watts
• Wet Sounds Unique Transformer
• Advanced Intelligent Microprocessor Control
• Top Mounted Crossover Controls
• Dimensions: 13" W x 19" L x 5" H
• Includes Amplifier Wiring Kit

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Wet Sounds SDX2 with NVX 4 Gauge Amp Kit

1250 Watt Sinister Series Full Range 2-Channel Class D Amplifier (WetSounds)

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Wet Sounds SDX2 with NVX 4 Gauge Amp Kit

1250 Watt Sinister Series Full Range 2-Channel Class D Amplifier (WetSounds)

• RMS: 400W x 2 @ 4 ohm, 620W x 2 @ 2 ohm, Bridged: 1250W x 1 @ 4 ohm
• Total RMS Power: 1250 watts
• Wet Sounds unique transformer
• Advanced Intelligent Microprocessor Control
• Top mounted crossover controls
• Dimensions: 9.82" W x 13.50" L x 2.70" H
• Includes Amplifier Wiring Kit

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DS18 SMD-5000.1D with NVX 1/0 Gauge Amp Kit

5000W RMS Class D SMD Series Monoblock Car Amplifier with Bass Remote

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DS18 SMD-5000.1D with NVX 1/0 Gauge Amp Kit

5000W RMS Class D SMD Series Monoblock Car Amplifier with Bass Remote

• 2000 watts x 1 channel @ 4 ohm
• 3500 watts x 1 channel @ 2 ohm
• 5000 watts x 1 channel @ 1 ohm
• Total RMS Power: 5000 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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American Bass GODFATHER 11D with NVX 8 Gauge Amp Kit

Godfather Series Class-D Monoblock Amplifier

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American Bass GODFATHER 11D with NVX 8 Gauge Amp Kit

Godfather Series Class-D Monoblock Amplifier

• Adjustable bass boost for customizable sound preferences
• Class D Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• Adjustable bass boost for customizable sound preferences
• Class D Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Wet Sounds Sinister-SDX2500 with NVX 1/0 Gauge Amp Kit

2500W RMS Class D Monoblock Subwoofer Amplifier

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Wet Sounds Sinister-SDX2500 with NVX 1/0 Gauge Amp Kit

2500W RMS Class D Monoblock Subwoofer Amplifier

• RMS: 1000 watts x 1 chan. @ 4 Ohm <1.0% THD, 1700 watts x 1 chan. @ 2 Ohm <1.0% THD, 2500 watts x 1 chan. @ 4 Ohm <1.0% THD
• Total power output: 2500 watts RMS
• MAXED Power Supply
• Advanced Intelligent Microprocessor Control
• Includes Amplifier Wiring Kit
• Overvoltage/Undervoltage Protection
• DC Offset & Speaker Short Protection
• Dimensions: 10.25" W x 22.125" L x 3.0" H

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18–23 JL Wrangler /20–23 JT Gladiator Kicker Marine Amp+Sub Plug & Bundle

800W Peak (400W RMS) Loaded Dual 10" Sealed Marine Enclosure with RGBW LED

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18–23 JL Wrangler /20–23 JT Gladiator Kicker Marine Amp+Sub Plug & Bundle

800W Peak (400W RMS) Loaded Dual 10" Sealed Marine Enclosure with RGBW LED

•Sealed enclosure with 2 10" MW Series Subwoofer
• 400 watts RMS (800 watts Peak)
• Final Impedance: 4-ohm
• Dimensions: 25-9/16" L x 12-5/8" H x 8-11/16" W

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•Sealed enclosure with 2 10" MW Series Subwoofer
• 400 watts RMS (800 watts Peak)
• Final Impedance: 4-ohm
• Dimensions: 25-9/16" L x 12-5/8" H x 8-11/16" W

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NVX Audio Upgrade Kit – QB10SPA with 2 Pair 6.5" Speakers

1200W MAX (350W RMS) Single 10" Amplified Ported Sub Enclosure w/ Remote Bass Knob, 2 Pair 6.5" Coaxial Speakers, Amp Kit, Sound Damping, and Roller

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NVX Audio Upgrade Kit – QB10SPA with 2 Pair 6.5" Speakers

1200W MAX (350W RMS) Single 10" Amplified Ported Sub Enclosure w/ Remote Bass Knob, 2 Pair 6.5" Coaxial Speakers, Amp Kit, Sound Damping, and Roller

• 10" Amplified Loaded Subwoofer System
• 350 watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost
• Speaker-Level Inputs
• Wired Remote Bass Level Control
• Includes 6.5(2) Co-axial Speaker and Damping Kits

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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

Kenwood eXcelon XR901-5 + NVX XKIT46

1800W Max (900W RMS) XR Series 2-ohm Stable Class-D 5-Channel Amplifier w/ Bass Knob Included + NVX Premium 4 Gauge 6-Channel Amp Wiring Kit

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Kenwood eXcelon XR901-5 + NVX XKIT46

1800W Max (900W RMS) XR Series 2-ohm Stable Class-D 5-Channel Amplifier w/ Bass Knob Included + NVX Premium 4 Gauge 6-Channel Amp Wiring Kit

• 60 Watts x 4, 400W x Sub Channel RMS @ 4 ohm
• 75 Watts RMS x 4, 600W x Sub Channel @ 2 ohm
• Total Peak Power: 1800 Watts
• CEA-2006 Compliant
• Remote Bass Knob Included
• Heavy Duty Aluminum Heatsink
• Dimensions:10-1/4" W x 6-5/8" L x 1" H

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Alpine S2-A55V with Amplifier Wiring Kit

540W RMS S-Series Class-D 5-Channel Amplifier + NVX 4 Gauge 6-Channel Wiring Kit

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Alpine S2-A55V with Amplifier Wiring Kit

540W RMS S-Series Class-D 5-Channel Amplifier + NVX 4 Gauge 6-Channel Wiring Kit

• 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
• Class D 2 ohm Stable 5-Channel-Channel Amplifier

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Rockford Fosgate Punch PM1000X5 with Amplifier Wiring Kit

1000W 5-Channel Powersports/Marine Amplifier

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Rockford Fosgate Punch PM1000X5 with Amplifier Wiring Kit

1000W 5-Channel Powersports/Marine Amplifier

• RMS: 75 watts x 4 chan. + 150 watts x 1 chan. @ 4 ohm, 125 watts x 4 chan. + 300 watts x 1 chan. @ 2 ohm
• CEA-2006 Compliant
• Features C.L.E.A.N. Set-up
• Protected against Dust, UV, & Corrosion
• Marine grade two part epoxy coating on circuit boards
• Includes NVX XKIT46 4 Gauge Amp Wiring Kit

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NVX NDA11005 with Amp Wiring Kit

2200W Peak (1100W RMS) N-Series Class-D 5-Channel Amplifier with NVX 4 Gauge Amplifier Wiring Kit

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NVX NDA11005 with Amp Wiring Kit

2200W Peak (1100W RMS) N-Series Class-D 5-Channel Amplifier with NVX 4 Gauge Amplifier Wiring Kit

• 100 watts x 4 channel + 315 watts x 1 channel @ 4 ohm
• 150 watts x 4 channel + 500 watts x 1 channel @ 2 ohm
• Bridged: 300 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 1100 watts
• Class D 2 ohm Stable 5-Channel-Channel Amplifier

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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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JBL Club A5055 (AMPCBA5055AM) + NVX XKIT46

Class AB + D High Performance 5-Channel Amplifier + NVX XKIT46 4 Gauge 6-Channel Amp Wirring Kit

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JBL Club A5055 (AMPCBA5055AM) + NVX XKIT46

Class AB + D High Performance 5-Channel Amplifier + NVX XKIT46 4 Gauge 6-Channel Amp Wirring Kit

• Class AB + D Amp Technology
• 4 Ohm: 50 Watts RMS x 4 + 320 Watts RMS x 1
• Variable Crossover and Bass Boost
• Variable High and Low-Pass Filters
• Full on Board Protection

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• Class AB + D Amp Technology
• 4 Ohm: 50 Watts RMS x 4 + 320 Watts RMS x 1
• Variable Crossover and Bass Boost
• Variable High and Low-Pass Filters
• Full on Board Protection

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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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Alpine PXE-C80-88 with NVX XKIT46

900W RMS Class D PXE Series 8 Channel Car Amplifier w/ Sound Tuning Full Spec 4 Gauge 100% Oxygen Free Copper Complete 5/6-Channel Amplifier Wiring Kit with RCA for Amplifiers

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Alpine PXE-C80-88 with NVX XKIT46

900W RMS Class D PXE Series 8 Channel Car Amplifier w/ Sound Tuning Full Spec 4 Gauge 100% Oxygen Free Copper Complete 5/6-Channel Amplifier Wiring Kit with RCA for Amplifiers

• 50 watts x 6 channel + 150 watts x 2 channel @ 4 ohm
• 50 watts x 6 channel + 300 watts x 2 channel @ 2 ohm
• Total RMS Power: 900 watts
• Class D 4 ohm Stable 8-Channel Amplifier

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• 50 watts x 6 channel + 150 watts x 2 channel @ 4 ohm
• 50 watts x 6 channel + 300 watts x 2 channel @ 2 ohm
• Total RMS Power: 900 watts
• Class D 4 ohm Stable 8-Channel Amplifier

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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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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Kenwood KAC-M8005 + NVX XKIT46 4 Gauge Amp Wiring Kit

5-Channel Marine Class-D Amplifier (800W RMS)

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Kenwood KAC-M8005 + NVX XKIT46 4 Gauge Amp Wiring Kit

5-Channel Marine Class-D Amplifier (800W RMS)

• 50 Watts RMS x 4 @ 4 ohm + 300 watts x 1 chan.
• 75 Watts RMS x 4 @ 2 ohm + 500 watts x 1 chan.
• Bridged: 150 Watts RMS x 2 @ 4 ohm
• Total Peak Power: 1600 Watts
• CEA-2006 Compliant
• Variable high-pass filter: 50 - 200 Hz, 12dB/octave
• Variable low-pass filter: 50 - 200 Hz, 24 dB/octave (sub)
• Extruded Aluminum Heat Sink Design
• Dimensions: 9"W x 7 3/8"L x 2 3/16"H
• Includes NVX XKIT46 4 Gauge Amp Wiring Kit

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Car Amplifier Packages & Bundles for your 1989 635CSi

Your Vehicle

Products that fit your vehicle, including universal options.

Shop the Category

Wet Sounds SYN-DX 4 with NVX 4 Gauge Amp Kit

Wet Sounds SYN-DX 4 with NVX 4 Gauge Amp Kit

Wet Sounds SDX-6 with NVX 4 Gauge Amp Kit

Wet Sounds SDX-6 with NVX 4 Gauge Amp Kit

Wet Sounds SDX2 with NVX 4 Gauge Amp Kit

Wet Sounds SDX2 with NVX 4 Gauge Amp Kit

DS18 SMD-5000.1D with NVX 1/0 Gauge Amp Kit

DS18 SMD-5000.1D with NVX 1/0 Gauge Amp Kit

American Bass GODFATHER 11D with NVX 8 Gauge Amp Kit

American Bass GODFATHER 11D with NVX 8 Gauge Amp Kit

Wet Sounds Sinister-SDX2500 with NVX 1/0 Gauge Amp Kit

Wet Sounds Sinister-SDX2500 with NVX 1/0 Gauge Amp Kit

18–23 JL Wrangler /20–23 JT Gladiator Kicker Marine Amp+Sub Plug & Bundle

18–23 JL Wrangler /20–23 JT Gladiator Kicker Marine Amp+Sub Plug & Bundle

NVX Audio Upgrade Kit – QB10SPA with 2 Pair 6.5" Speakers

NVX Audio Upgrade Kit – QB10SPA with 2 Pair 6.5" Speakers

Audio Control LC-5.1300 with NVX 4 Gauge Amp Kit

Audio Control LC-5.1300 with NVX 4 Gauge Amp Kit

Kenwood eXcelon XR901-5 + NVX XKIT46

Kenwood eXcelon XR901-5 + NVX XKIT46

Alpine S2-A55V with Amplifier Wiring Kit

Alpine S2-A55V with Amplifier Wiring Kit

Rockford Fosgate Punch PM1000X5 with Amplifier Wiring Kit

Rockford Fosgate Punch PM1000X5 with Amplifier Wiring Kit

NVX NDA11005 with Amp Wiring Kit

NVX NDA11005 with Amp Wiring Kit

Alpine R-A90S with NVX 4 Gauge Amp Kit

Alpine R-A90S with NVX 4 Gauge Amp Kit

JBL Club A5055 (AMPCBA5055AM) + NVX XKIT46

JBL Club A5055 (AMPCBA5055AM) + NVX XKIT46

NVX VAD11005 with Amplifier Wiring Kit

NVX VAD11005 with Amplifier Wiring Kit

Alpine PXE-C80-88 with NVX XKIT46

Alpine PXE-C80-88 with NVX XKIT46

Pioneer GM-DX975 with NVX 4 Gauge Amp Kit

Pioneer GM-DX975 with NVX 4 Gauge Amp Kit

Rockford Fosgate R2-750X5 with Amplifier Wiring Kit

Rockford Fosgate R2-750X5 with Amplifier Wiring Kit

Kenwood KAC-M8005 + NVX XKIT46 4 Gauge Amp Wiring Kit

Kenwood KAC-M8005 + NVX XKIT46 4 Gauge Amp Wiring Kit

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