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1981 Audi 4000

Universal gear includes car amplifiers, subs, and other products that do not install in a specific location or require fitment to integrate with a vehicle.

Universal-Fit Audio for 1981 Audi 4000

When thinking of universal gear, we consider products like a car amp that gives more power to your speakers or subs, cell phone chargers, equalizers and sound processors, rear-seat entertainment and video monitors, as well as dash cameras.

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Shuriken SK-BT20

12V 20Ah Absorbed Glass Mat (AGM) Rechargeable Battery

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12V 20Ah Absorbed Glass Mat (AGM) Rechargeable Battery

• 12-volt Automotive Absorbed Glass Mat (AGM) Battery
• Sealed Absorbed Glass Mat (AGM) design
• Perfect for 600 watts car audio stereo systems
• Can be mounted in any position
• Can be fully discharged and re-charged

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List price $151.99
-11% $135.99

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• 12-volt Automotive Absorbed Glass Mat (AGM) Battery
• Sealed Absorbed Glass Mat (AGM) design
• Perfect for 600 watts car audio stereo systems
• Can be mounted in any position
• Can be fully discharged and re-charged

Crimestopper LP-FRAME-CHR

License Plate Frame for CAM-300 and CAM-400 Backup Camera (Chrome)

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License Plate Frame for CAM-300 and CAM-400 Backup Camera (Chrome)

• Full Frame License Plate Frame Camera Bracket
• Works exclusively with CAM-300 and CAM-400
• High shine chrome metal finish
• Hidden wiring for easy installation

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• Full Frame License Plate Frame Camera Bracket
• Works exclusively with CAM-300 and CAM-400
• High shine chrome metal finish
• Hidden wiring for easy installation

NVX - Worth the Envy - Direct to Consumer Car Audio

Cerwin Vega CCB200

200A 0/4-Gauge Input 0/4-Gauge Output Premium Circuit Breaker

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200A 0/4-Gauge Input 0/4-Gauge Output Premium Circuit Breaker

• Premium Circuit Breaker
• Power Rating: 200A
• Input Gauge Size: 0 - 4 AWG
• Ouput Gauge Size: 0 - 4 AWG
• Platinum plated for stable performance
• Low-resistance, high-current ability

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List price $47.99
-17% $39.99

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• Premium Circuit Breaker
• Power Rating: 200A
• Input Gauge Size: 0 - 4 AWG
• Ouput Gauge Size: 0 - 4 AWG
• Platinum plated for stable performance
• Low-resistance, high-current ability

Sundown Audio E8 v.6 D2 8" (E8V6D2)

800W Peak (400W RMS) 8" E Series Dual 2-ohm Car Subwoofer (SW-EV68D2)

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800W Peak (400W RMS) 8" E Series Dual 2-ohm Car Subwoofer (SW-EV68D2)

• Peak Power: 800 watts
• RMS Power: 400 watts
• Impedance: Dual 2 ohm
• Pressed Paper Cone
• Pressed Foam Surround
• Mount depth: 4.98"
• Sensitivity: 82.4 dB

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-17% $169.99

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PRV Audio MDX2000.4 2 Ohm

2000W RMS Class D MDX Series 4-Channel Compact Car and Motorsport Amplifier

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2000W RMS Class D MDX Series 4-Channel Compact Car and Motorsport Amplifier

• 330 watts x 4 channel @ 4 ohm
• 500 watts x 4 channel @ 2 ohm
• Bridged: 1000 watts x 2 channel @ 4 ohm
• Total RMS Power: 2000 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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• 330 watts x 4 channel @ 4 ohm
• 500 watts x 4 channel @ 2 ohm
• Bridged: 1000 watts x 2 channel @ 4 ohm
• Total RMS Power: 2000 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Orion HCCA122

10000W Peak (2500W RMS) 12" HCCA Series Dual 2-ohm Competition Car Subwoofer

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10000W Peak (2500W RMS) 12" HCCA Series Dual 2-ohm Competition Car Subwoofer

• Peak Power: 10000 watts
• RMS Power: 2500 watts
• Impedance: Dual 2 ohm
• Moisture and UV-resistant Paper cone
• Nitrile Butadiene Rubber (NBR)-Foam surround
• Mount depth: 10.28"
• Sensitivity: 84.22 dB

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• Peak Power: 10000 watts
• RMS Power: 2500 watts
• Impedance: Dual 2 ohm
• Moisture and UV-resistant Paper cone
• Nitrile Butadiene Rubber (NBR)-Foam surround
• Mount depth: 10.28"
• Sensitivity: 84.22 dB

Kenwood KCA-RC55MR

Marine Wired Remote Control w/ 2-line LCD Screen for Select Kenwood Headunits

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Marine Wired Remote Control w/ 2-line LCD Screen for Select Kenwood Headunits

• Controls Select Kenwood Marine Receivers
• LCD 2-Line Display
• Includes Anodized Aluminum Mounting Hardware

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• Controls Select Kenwood Marine Receivers
• LCD 2-Line Display
• Includes Anodized Aluminum Mounting Hardware

Crimestopper LP-BRACKET

License Plate Bracket for CAM-300 and CAM-400 Backup Camera

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License Plate Bracket for CAM-300 and CAM-400 Backup Camera

• License Plate Camera Bracket
• Works exclusively with CAM-300 and CAM-400
• Powder coated black finish
• Mounts behind license plate

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• License Plate Camera Bracket
• Works exclusively with CAM-300 and CAM-400
• Powder coated black finish
• Mounts behind license plate

Sound Extreme by ECOXGEAR GDI-EXESW801 (Black)

500W Peak (250W RMS) Loaded Dual 8" Sealed Amplified Subwoofer Enclosure with RGB LED lighting

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500W Peak (250W RMS) Loaded Dual 8" Sealed Amplified Subwoofer Enclosure with RGB LED lighting

• 8" Amplified Loaded Subwoofer System
• Includes two SoundExtreme ES08 subwoofers
• 250 watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost
• Multi-color LED backlit speakers
• Wired remote bass level control
• IP66 marine-grade rating

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$499.99

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• 8" Amplified Loaded Subwoofer System
• Includes two SoundExtreme ES08 subwoofers
• 250 watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost
• Multi-color LED backlit speakers
• Wired remote bass level control
• IP66 marine-grade rating

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Deaf Bonce Apocalypse ATOM 3.5K PRO

3500W RMS Class D Apocalypse Atom Pro Series Monoblock Car Amplifier with Bass Remote

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3500W RMS Class D Apocalypse Atom Pro Series Monoblock Car Amplifier with Bass Remote

• 1210 watts x 1 channel @ 4 ohm
• 2200 watts x 1 channel @ 2 ohm
• 3500 watts x 1 channel @ 1 ohm
• Total RMS Power: 3500 watts
• Class D 1 ohm Stable Monoblock Amplifier

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$379.90

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Belva BAK44

4 Gauge Premium (CCA) Copper Clad Aluminum Complete 4-Channel Amplifier Wiring Kit with RCA for Amplifiers up to 1200 Watts - RED

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4 Gauge Premium (CCA) Copper Clad Aluminum Complete 4-Channel Amplifier Wiring Kit with RCA for Amplifiers up to 1200 Watts - RED

• Complete 4 Gauge Amplifier Installation Kit
• For Amplifiers Up To 1200 Watts RMS
• Premium (CCA) Copper Clad Aluminum
• Helical Twist 4-Channel RCA Cable
• ANL/Mini-ANL Fuse Holder with 80 amp fuse
• Complies to American Wire Gauge standards

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61
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Rockford Fosgate R500X1D Amplifier + Free Belva BAK42BK 4 Gauge Amp Kit

R500X1D 500W RMS Prime Series Class D Monoblock Amplifier 4 Gauge Wiring Kit with 2-Channel RCA Interconnects

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R500X1D 500W RMS Prime Series Class D Monoblock Amplifier 4 Gauge Wiring Kit with 2-Channel RCA Interconnects

• R500X1D 500W RMS Prime Series Class D Monoblock Amplifier
• BAK42 Complete 4 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects (CCA Wiring)

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• R500X1D 500W RMS Prime Series Class D Monoblock Amplifier
• BAK42 Complete 4 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects (CCA Wiring)

Kicker CK4 (46CK4)

Complete 4 Gauge OFC CK-Series 2-Channel Amplifier Installation Kit

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Complete 4 Gauge OFC CK-Series 2-Channel Amplifier Installation Kit

• self tapping bolt and washer
• FHS fuse holder
• gauge remote wire
• AWG butt connecter

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Used from: $139.99

T-Spec VANL1

V12 Series 1/0- or 4-Gauge ANL fuse holder

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V12 Series 1/0- or 4-Gauge ANL fuse holder

• Accepts 1/0 or 4-Gauge Power Wire
• ANL Fuse Holder
• Anodized Finish

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• Accepts 1/0 or 4-Gauge Power Wire
• ANL Fuse Holder
• Anodized Finish

Rockford Fosgate RFK4I

4 Gauge 100% Pure Crystal-Oxygen Free Copper 2-Channel Amplifier Wiring Kit

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4 Gauge 100% Pure Crystal-Oxygen Free Copper 2-Channel Amplifier Wiring Kit

• 4 Gauge Power and Signal Installation Kit
• 100% Pure Crystal-Oxygen Free Copper (PC-OFC)
• FULL Spec Cable Meets or Exceeds AWG (American Wire Gauge) Requirements
• Includes Appropriate Wire Termination Hardware

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Atrend 10W7SV

Empty Single 10" Vented Enclosure for JL Audio W7/W7AE Series Subwoofers

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Empty Single 10" Vented Enclosure for JL Audio W7/W7AE Series Subwoofers

• 10" Single Ported Subwoofer Enclosure
• Fits JL Audio W7/W7AE series subwoofers
• 1" Medium Density Fiberboard (MDF) construction
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 1.5 cubic feet

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Install Bay IBHPLUG34

3/4in Hole Plug Flush Black 1in Head Diameter - 100PK

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3/4in Hole Plug Flush Black 1in Head Diameter - 100PK

• 3/4 Inch Hole Plug
• 100 Pack
• 1" Head Diameter

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List price $13.99
-14% $11.99

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• 3/4 Inch Hole Plug
• 100 Pack
• 1" Head Diameter

NVX XLCA2X

2-Channel Line Output Converter Digital Bass Enhancer with xBOOST, Impedance Matching, and Remote Level Control

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2-Channel Line Output Converter Digital Bass Enhancer with xBOOST, Impedance Matching, and Remote Level Control

• 2-Channel Speaker Level Inputs
• Adjustable xBOOST corrects for bass roll-off
• Handles up to 30V (225 watts RMS)
• Provides up to 9.5 Volts of output
• Auto turn-on via DC offset or Audio detection 
• Load selection switch (20, 60, or 20K ohm)
• Wired remote bass level control included
• LED Clip indicator

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List price $129.99
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• 2-Channel Speaker Level Inputs
• Adjustable xBOOST corrects for bass roll-off
• Handles up to 30V (225 watts RMS)
• Provides up to 9.5 Volts of output
• Auto turn-on via DC offset or Audio detection 
• Load selection switch (20, 60, or 20K ohm)
• Wired remote bass level control included
• LED Clip indicator

Limited time!

NVX BIR80

80-Amp High Current Dual Battery Isolator and Relay for Car Audio Systems (Handles up to 150-Amp Surge)

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80-Amp High Current Dual Battery Isolator and Relay for Car Audio Systems (Handles up to 150-Amp Surge)

• 80-Amp continuous / 150-Amp surge
• Ideal for car stereo systems and mobile electronics
• Prevents the main starter battery from draining
• 10V to 16.5V DC operating range

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• 80-Amp continuous / 150-Amp surge
• Ideal for car stereo systems and mobile electronics
• Prevents the main starter battery from draining
• 10V to 16.5V DC operating range

Metra 82-4301

Universal 1" Speaker Spacer Rings for 6" to 6-3/4"

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Universal 1" Speaker Spacer Rings for 6" to 6-3/4"

• Universal 1" Speaker Spacer Rings for 6" to 6.75" Aftermarket Car Speakers
• Color: Black
• High Grade ABS Plastic Construction
• Factory Matched Texture Style

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• Universal 1" Speaker Spacer Rings for 6" to 6.75" Aftermarket Car Speakers
• Color: Black
• High Grade ABS Plastic Construction
• Factory Matched Texture Style

Limited time!

NVX VSW124 Version 3 (VSW124v3)

1200 Watt (600W RMS) 12" VS-Series v3 Dual 4-ohm Car Subwoofer

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1200 Watt (600W RMS) 12" VS-Series v3 Dual 4-ohm Car Subwoofer

• Peak Power: 1200 watts
• RMS Power: 600 watts
• Impedance: Dual 4 ohm
• Enhanced Pressed Paper Cone
• High Roll Foam Surround
• Mount depth: 6.45"
• Sensitivity: 86 dB

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List price $155.99
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NVX VSLR39

39-Ohm Load Resistors for all makes and models 2005-2015 with OEM Sound Systems

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39-Ohm Load Resistors for all makes and models 2005-2015 with OEM Sound Systems

• 39 Ohm Load Resistors
• Prevents Audio Shutdown and Distortion
• Compatible with most devices with speaker-level inputs
• Sold as a pair

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• 39 Ohm Load Resistors
• Prevents Audio Shutdown and Distortion
• Compatible with most devices with speaker-level inputs
• Sold as a pair

Avital D9147L

1-Way 4-Button Remote Start Keyless Entry and Alarm LED Car Remote Transmitters

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1-Way 4-Button Remote Start Keyless Entry and Alarm LED Car Remote Transmitters

• 1-Way Remote Car Starter
• Includes (2) 1-way LED transmitters
• 1/4 mile (1320 feet) range
• Internal antenna
• Active transmit LED
• Command buttons

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List price $99.99
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• 1-Way Remote Car Starter
• Includes (2) 1-way LED transmitters
• 1/4 mile (1320 feet) range
• Internal antenna
• Active transmit LED
• Command buttons

Metra 44-EC36 Antenna Extension

36" Universal Antenna Extension Cable

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36" Universal Antenna Extension Cable

• 36" (91cm) Universal extension cable
• Contains impedance matching capacitors

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• 36" (91cm) Universal extension cable
• Contains impedance matching capacitors

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Kicker WXA3600.1 (49WXA36001)

5000W Peak Class D Warhorse Series Monoblock Car Amplifier

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5000W Peak Class D Warhorse Series Monoblock Car Amplifier

• 1400 watts x 1 channel @ 4 ohm
• 2500 watts x 1 channel @ 2 ohm
• 3600 watts x 1 channel @ 1 ohm
• Total Peak Power: 5000 watts
• Class D 1 ohm Stable Monoblock Amplifier

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DS18 ION700.2D

2100W Peak (700W RMS) Class D iON Series 2-Channel Car Amplifier

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2100W Peak (700W RMS) Class D iON Series 2-Channel Car Amplifier

• 240 watts x 2 channel @ 4 ohm
• 350 watts x 2 channel @ 2 ohm
• Bridged: 700 watts x 1 channel @ 4 ohm
• Total RMS Power: 700 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier

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List price $359.99
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JBL Stage GT 60041 (JBLSTAGEGT60041AM)

1240W Peak (360W RMS) Class D Stage GT Series 4-Channel Car Amplifier

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1240W Peak (360W RMS) Class D Stage GT Series 4-Channel Car Amplifier

• 65 watts x 4 channel @ 4 ohm
• 90 watts x 4 channel @ 2 ohm
• Bridged: 180 watts x 2 channel @ 4 ohm
• Total RMS Power: 360 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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List price $279.95
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FREE Belva Amp Kit at Checkout!
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Limitless Lithium LLDUAL-1/0

Dual 1/0-Gauge to 1/0-Gauge Input Wire Reducers

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Dual 1/0-Gauge to 1/0-Gauge Input Wire Reducers

• Universal Dual 1/0 to 1/0 Gauge Amp Inputs
• Merges two 1/0-gauge cables into one input
• Precision machined construction
• Sold as pair

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• Universal Dual 1/0 to 1/0 Gauge Amp Inputs
• Merges two 1/0-gauge cables into one input
• Precision machined construction
• Sold as pair

Limited time!

JL Audio RD500/1

500W RMS Class D RD Series Monoblock Car Amplifier

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500W RMS Class D RD Series Monoblock Car Amplifier

• 250 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable Monoblock Amplifier

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List price $399.99
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NVX XAPK4 + XIV25 (XKIT42 Sub)

$109.99

$76.99

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Used from: $313.50

• 250 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable Monoblock Amplifier

Heise HE-HDRH22

120W Universal 22” Dual Row High Output Heated 40 LED Light Bar

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120W Universal 22” Dual Row High Output Heated 40 LED Light Bar

• Universal 22" Double Row LED Light Bar
• Water-resistant IPX-67 Rating
• Flood/Spot Combo Beam Pattern
• Integrated epoxy-encapsulated electronics
• Includes rear/side brackets and mounting hardware hebd8

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• Universal 22" Double Row LED Light Bar
• Water-resistant IPX-67 Rating
• Flood/Spot Combo Beam Pattern
• Integrated epoxy-encapsulated electronics
• Includes rear/side brackets and mounting hardware hebd8

American Bass VFL REBEL 1400.4

1420W RMS Class D VFL Rebel Series 4-Channel Car and Motorcycle Amplifier

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1420W RMS Class D VFL Rebel Series 4-Channel Car and Motorcycle Amplifier

• 220 watts x 4 channel @ 4 ohm
• 355 watts x 4 channel @ 2 ohm
• Bridged: 700 watts x 2 channel @ 4 ohm
• Total RMS Power: 1420 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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List price $399.00
-10% $359.00

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FREE Belva Amp Kit at Checkout!
Save 30% off an NVX XKIT44 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT44 Amp Kit! No code needed — discount applies automatically at checkout.

Rockford Fosgate RFIF2SW Speaker to RCA Adapter

High Level Speaker Line Wire Input To Female RCA Output Adapter

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High Level Speaker Line Wire Input To Female RCA Output Adapter

• Speaker Line High Level Input To Female RCA Output Adapter
• Converts Factory (OEM) High Level Speaker Outputs into RCA Outputs for Use with an Aftermarket Amp

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• Speaker Line High Level Input To Female RCA Output Adapter
• Converts Factory (OEM) High Level Speaker Outputs into RCA Outputs for Use with an Aftermarket Amp

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NVX YSW124

1600W Peak (800W RMS) 12" Y-Series Dual 4-ohm Car Subwoofer

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1600W Peak (800W RMS) 12" Y-Series Dual 4-ohm Car Subwoofer

• Peak Power: 1600 watts
• RMS Power: 800 watts
• Impedance: Dual 4 ohm
• Enhanced Pressed Paper Cone
• High Roll Foam Surround
• Mount depth: 6.5"
• Sensitivity: 85 dB

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-34% $149.99

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Like New from: $161.49

Clarion CMR-20

Wired Marine Remote Control with 2.4" LCD Display for Select Clarion Marine Stereos

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Wired Marine Remote Control with 2.4" LCD Display for Select Clarion Marine Stereos

• Wired marine remote control with display
• 2.4" Monochrome segmented TFT LCD backlit display
• Compatible with select Clarion stereos
• Easily adds up to 3 remotes
• IP67-rated water resistant design

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$149.99

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• Wired marine remote control with display
• 2.4" Monochrome segmented TFT LCD backlit display
• Compatible with select Clarion stereos
• Easily adds up to 3 remotes
• IP67-rated water resistant design

Kicker L7XS121 (52L7XS121)

3000W RMS 12" SoloXS L7XS Series Dual 1-ohm Square Car Subwoofer

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3000W RMS 12" SoloXS L7XS Series Dual 1-ohm Square Car Subwoofer

• RMS Power: 1500 - 3000 watts
• Impedance: Dual 1 ohm
• Double-pressed pulp Cone
• Nitrile Butadiene Rubber NBR Surround
• Mount depth: 10-1/8"

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List price $1499.99
-7% $1,399.99

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• RMS Power: 1500 - 3000 watts
• Impedance: Dual 1 ohm
• Double-pressed pulp Cone
• Nitrile Butadiene Rubber NBR Surround
• Mount depth: 10-1/8"

Xpresskit KIVW

Volkswagen and Audi Smart Key Module Interface (Touareg & A8)

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Volkswagen and Audi Smart Key Module Interface (Touareg & A8)

• Smart Key Module Interface
• For Audi A8, Porsche Cayenne Volkswagon Touareg Models Equipped With the Smart Key Ignition System
• Ready to Install Right Out of the Box
• No Programming Required
• Factory Alarm Disarm

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-72% $46.99

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• Smart Key Module Interface
• For Audi A8, Porsche Cayenne Volkswagon Touareg Models Equipped With the Smart Key Ignition System
• Ready to Install Right Out of the Box
• No Programming Required
• Factory Alarm Disarm

Rockford Fosgate RFDGML

Platinum Plated Long GM Battery Post Extender For Double Stacked Terminals

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Platinum Plated Long GM Battery Post Extender For Double Stacked Terminals

• HPP plating for superior corrosion resistance
•Custom tooled solid brass
• Allows additional power or ground connections
• Contains One (1) Terminal Bolt

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• HPP plating for superior corrosion resistance
•Custom tooled solid brass
• Allows additional power or ground connections
• Contains One (1) Terminal Bolt

Install Bay IBR95

12V Digital Voltage Meter

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12V Digital Voltage Meter

• 12V Voltage Meter
• Digital Display
• Mounts in Dash

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List price $64.99
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• 12V Voltage Meter
• Digital Display
• Mounts in Dash

Install Bay 4 Gauge Amplifier Power Wiring Kit (AK4)

Amplifier Installation Power Kit with RCA Interconnect Cables and Fuse Holder with Fuse

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Amplifier Installation Power Kit with RCA Interconnect Cables and Fuse Holder with Fuse

• 4 Gauge Amplifier Installation Kit with RCA Interconnect Cables
• Perfect for 1600 Watts Amplifier Setup
• 17ft. Blue Power Cable
• 3ft. Black Ground Cable
• 17ft. Blue RCA Cable

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Available Offers (2) for Install Bay 4 Gauge Amplifier Power Wiring Kit (AK4)
15% off an NVX XCAP10H w/ Select Amp Kits Add a qualifying amplifier to your cart and save 15% on the NVX XCAP10H Capacitor! No code needed — discount applies automatically at checkout.
15% off an NVX XCAP1F w/ Select Amp Kits Add a qualifying amplifier to your cart and save 15% on the NVX XCAP1F Capacitor! No code needed — discount applies automatically at checkout.

Stinger SPW318BL

PRO Series 18 Gauge Blue Primary Wire 500ft Roll

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PRO Series 18 Gauge Blue Primary Wire 500ft Roll

Single conductor wire • Length: 500ft • Flexible jacket • Gauge: 18 Gauge •

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Single conductor wire • Length: 500ft • Flexible jacket • Gauge: 18 Gauge •

NVX - Worth the Envy - Direct to Consumer Car Audio

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    Q: Can I upgrade or change the Universal-Fit Audio & Electronics in 1981 Audi 4000?

    A: Yes this page includes all the best Universal-Fit Audio & Electronics that work in your 4000.

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    Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

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