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1981 Audi 4000 S

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 S

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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Escort MAX 360c MKII (360cmkii)

Radar and Laser Detector with Wi-Fi, GPS, Bluetooth, and App Control

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Radar and Laser Detector with Wi-Fi, GPS, Bluetooth, and App Control

• Multi Band Radar and Laser Detector
• Works with Apple CarPlay and Android Auto
• AutoLearn Intelligence GPS-based technology
• Dual-band Wi-Fi for software updates
• True 360-degree awareness
• Variable speed sensitivity
• Supports Drive Smarter software
• M2 and Shifter compatible

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$599.95

In stock

• Multi Band Radar and Laser Detector
• Works with Apple CarPlay and Android Auto
• AutoLearn Intelligence GPS-based technology
• Dual-band Wi-Fi for software updates
• True 360-degree awareness
• Variable speed sensitivity
• Supports Drive Smarter software
• M2 and Shifter compatible

XS Power Titan8 (PWR-S6-3400)

6000W 10Ah Lithium Titanate Oxide (LTO) Battery

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6000W 10Ah Lithium Titanate Oxide (LTO) Battery

• 14-volt Lithium Battery
• Sealed Lithium Titanate Oxide (LTO) design
• Perfect for up to 6000-watt audio systems

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1
$699.99

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Like New from: $594.99

• 14-volt Lithium Battery
• Sealed Lithium Titanate Oxide (LTO) design
• Perfect for up to 6000-watt audio systems

NVX - Worth the Envy - Direct to Consumer Car Audio

Tru Spec S15SUPB

Empty Single 15" Vented Prefabricated Enclosure

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Empty Single 15" Vented Prefabricated Enclosure

• 15" Single Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Computer-designed CNC cut
• Total box volume: 3.50 cubic feet

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List price $399.99
-25% $299.99

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Rockford Fosgate PMX-ANT Antenna

AM/FM/WB Amplified 12V Antenna

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AM/FM/WB Amplified 12V Antenna

• PMX-ANT AM/FM/WB Amplified 12V Antenna
• Universal AM/FM/WB Antenna
• Omnidirectional
• Quick Power Connect for Easy Installation

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$89.99

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• PMX-ANT AM/FM/WB Amplified 12V Antenna
• Universal AM/FM/WB Antenna
• Omnidirectional
• Quick Power Connect for Easy Installation

AudioControl LC-5.1300

1300W RMS Class D LC Series 5-Channel Car Amplifier with AccuBass

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1300W RMS Class D LC Series 5-Channel Car Amplifier with AccuBass

• 100 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 200 watts x 4 channel + 500 watts x 1 channel @ 2 ohm
• Bridged: 400 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 1300 watts
• Class D 2 ohm Stable 5-Channel Amplifier

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Available Offers (2) for AudioControl LC-5.1300
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PAC SNI-35

50W Peak Variable LOC

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50W Peak Variable LOC

• Adjustable Line Output Converter
• Utilize Audio Transformer for Noise Isolation
• Compatible with 2 - 40 watts RMS of Radio Output

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• Adjustable Line Output Converter
• Utilize Audio Transformer for Noise Isolation
• Compatible with 2 - 40 watts RMS of Radio Output

Install Bay IBFG8

8 Gauge (3/4" Mounting Hole) Waterproof Firewall Grommet

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8 Gauge (3/4" Mounting Hole) Waterproof Firewall Grommet

• 8 Gauge Firewall Grommet
• IP68 Waterproof Rating
• Protects Cables When Installing Through a FIrewall
• Sold Individually

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List price $2.99
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• 8 Gauge Firewall Grommet
• IP68 Waterproof Rating
• Protects Cables When Installing Through a FIrewall
• Sold Individually

JL Audio PS-SWMCP-B-2.250

2.25" Pipe Mounting Fixtures for VeX Marine Tower Speakers

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2.25" Pipe Mounting Fixtures for VeX Marine Tower Speakers

• 2.25" Pipe Mounting Fixtures for VeX Marine Tower Speakers
• Fixed mounting fixtures for PS650-VeX models
• Anodized finish with UV corrosion-resistant
• Allows mount to a variety of roll cage diameters or flat surfaces

Save on select Clamps!
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Buy 1 Select M6 Series Marine Tower Speakers and you’ll save 50% off Select Clamps in your cart


• 2.25" Pipe Mounting Fixtures for VeX Marine Tower Speakers
• Fixed mounting fixtures for PS650-VeX models
• Anodized finish with UV corrosion-resistant
• Allows mount to a variety of roll cage diameters or flat surfaces

Rockford Fosgate DSR-1

8-Channel Digital Signal Processor with Integrated iDataLink Maestro Module

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8-Channel Digital Signal Processor with Integrated iDataLink Maestro Module

• Digital Signal Processing with Integrated Maestro CAN Interface
• Four channel high level inputs with signal sense turn on
• 18 Pin Analog Input and 16 Pin Analog Output Harness
• Interactive Tuning Interface Controlled via Android/iOS APP

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• Digital Signal Processing with Integrated Maestro CAN Interface
• Four channel high level inputs with signal sense turn on
• 18 Pin Analog Input and 16 Pin Analog Output Harness
• Interactive Tuning Interface Controlled via Android/iOS APP

Limited time!

NVX BARCAM221

Universal Waterproof License Plate Mount Backup Camera with Full Metal Body

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Universal Waterproof License Plate Mount Backup Camera with Full Metal Body

• Universal Rear View Backup Camera
• High-Resolution CMOS PC1089 Image Sensor
• Mounting Style: Top of License Plate Frame
• Viewing Angle: 170 ° (super wide viewing angle)
• Resolution: 510 x 496 
• Waterproof: Yes (IP67/68 waterproof)
• Night vision: Infrared LED's

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List price $99.99
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Used from: $36.99

Install Bay IBVSTABL

12V 2A DC-DC Voltage Converter Stabilizer

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12V 2A DC-DC Voltage Converter Stabilizer

• Voltage converter stabilizer
• Input voltage: DC 8 volts - 40 volts
• Output voltage: DC 12 volts
• Maximum output current: 2 amps

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-11% $50.99

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• Voltage converter stabilizer
• Input voltage: DC 8 volts - 40 volts
• Output voltage: DC 12 volts
• Maximum output current: 2 amps

NVX VADM1 v2 (VADM1v2)

600W RMS Class D V-Series Micro Monoblock Car/Marine/Powersports Amplifier with Bass Remote

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600W RMS Class D V-Series Micro Monoblock Car/Marine/Powersports Amplifier with Bass Remote

• 240 watts x 1 channel @ 4 ohm
• 400 watts x 1 channel @ 2 ohm
• 600 watts x 1 channel @ 1 ohm
• Total RMS Power: 600 watts
• Class D 1 ohm Stable Monoblock Amplifier

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Save 30% off an NVX XKIT82 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT82 Amp Kit! No code needed — discount applies automatically at checkout.
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2026-07-27 11:08:20

4 Pack of 100 Amp Nickel-Plated MANL Fuse (Belva BMANL100)

Four fuses per order. High quality 100 Amp MANL Fuses

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Four fuses per order. High quality 100 Amp MANL Fuses

• 100A MANL Fuse (4 Pack)
• Nickel Plated for Better Power Transfer
• Resealable Polybag
• Heavy Duty Construction

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• 100A MANL Fuse (4 Pack)
• Nickel Plated for Better Power Transfer
• Resealable Polybag
• Heavy Duty Construction

Limited time!

Alpine R2-W10D2

2250W Peak (750W RMS) 10" R2-Series Dual 2-ohm Car Subwoofer

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2250W Peak (750W RMS) 10" R2-Series Dual 2-ohm Car Subwoofer

• Peak Power: 2250 watts
• RMS Power: 750 watts
• Impedance: Dual 2 ohm
• Kevlar Reinforced Pulp Paper Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 5.92"
• Sensitivity: 82.3 dB

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3
List price $480.00
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Viper D9858V

2-Way 5-Button Remote Start and Car Alarm LED Transmitters

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2-Way 5-Button Remote Start and Car Alarm LED Transmitters

• 2-Way 5-Button Remote Start and Car Alarm LED Transmitters
• Includes (1) 2-way LED transmitter and (1) 1-way transmitter
• 1 mile range
• Compatible with Viper DS4 and DS4P security systems

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• 2-Way 5-Button Remote Start and Car Alarm LED Transmitters
• Includes (1) 2-way LED transmitter and (1) 1-way transmitter
• 1 mile range
• Compatible with Viper DS4 and DS4P security systems

Limited time!

Belva BAK44BL

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

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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 - BLUE

• 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

FREE Belva Amp Kit at Checkout!
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NVX XPLOC2

2-Channel 300W Adjustable Line Output Converter with Remote Turn On

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2-Channel 300W Adjustable Line Output Converter with Remote Turn On

• 2-Channel Premium Adjustable Line Output Converter
• 3:1 Step Down With Adjustable Output
• 300w Total Maximum Input (150w Per Channel)
• Super Low Distortion

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• 2-Channel Premium Adjustable Line Output Converter
• 3:1 Step Down With Adjustable Output
• 300w Total Maximum Input (150w Per Channel)
• Super Low Distortion

Metra 82-4400

1/2" Universal 6.5" to 6.75" Plastic Speaker Spacer Rings

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1/2" Universal 6.5" to 6.75" Plastic Speaker Spacer Rings

• Works with Most 5-1/4" Speakers
• Factory Style Finishes
• Heavy Duty ABS Plastic
• Works with 6" to 6.5" Speakers

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• Works with Most 5-1/4" Speakers
• Factory Style Finishes
• Heavy Duty ABS Plastic
• Works with 6" to 6.5" Speakers

T-Spec VANL

V8 SERIES ANL 1/0 AWG FUSE HOLDER

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V8 SERIES ANL 1/0 AWG FUSE HOLDER

• 1/0 AQWG Fuse Holder
• Lok-Nut style fasteners
• Water resistant

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$19.00

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• 1/0 AQWG Fuse Holder
• Lok-Nut style fasteners
• Water resistant

Belva BST408

Pair of 4 Gauge Spade Terminals, #8 Opening with Nickel Plated Brass (1 Black & 1 Red)

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Pair of 4 Gauge Spade Terminals, #8 Opening with Nickel Plated Brass (1 Black & 1 Red)

• Spade Terminals
• 4 Gauge
• 1 Red & 1 Black
• Nickel Plated
• Resealable Polybag

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• Spade Terminals
• 4 Gauge
• 1 Red & 1 Black
• Nickel Plated
• Resealable Polybag

Limited time!

AudioControl LC1i

2-Channel 400W Line Output Converter

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2-Channel 400W Line Output Converter

• 2-Channel Line Out Converter
• 2 inputs and 2 outputs
• Compact design

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• 2-Channel Line Out Converter
• 2 inputs and 2 outputs
• Compact design

Fusion MS-ARX70B

Wireless marine stereo remote (Black)

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Wireless marine stereo remote (Black)

• IPX6 and IPX7 water rating
• Built-in ANT technology
• Easy-to-use buttons and LED lighting
• Available in White

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$69.99

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Only 1 Left!

• IPX6 and IPX7 water rating
• Built-in ANT technology
• Easy-to-use buttons and LED lighting
• Available in White

Hertz S8 DSP

8-Channel Digital Sound Processor with Automatic Time Correction, Digital Equalizer, and High-Resolution Audio

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8-Channel Digital Sound Processor with Automatic Time Correction, Digital Equalizer, and High-Resolution Audio

• 8-Channel Digital Sound Processor
• 7-Band parametric equalizer
• Speaker level (high-level) inputs
• Bluetooth for for added control
• High-resolution audio
• Configurable via S8 DSP application/software

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-8% $419.99

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• 8-Channel Digital Sound Processor
• 7-Band parametric equalizer
• Speaker level (high-level) inputs
• Bluetooth for for added control
• High-resolution audio
• Configurable via S8 DSP application/software

SPL-LAB Wireless Bass Meter

Portable sound level meter for measuring the sound pressure

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Portable sound level meter for measuring the sound pressure

• Calibrated according to the TERM-LAB Classic and Magnum
• Amplitude range from 110 to 190 dB
• Frequency range from 10 to 120 Hz
• ADC module and WiFi module
• Wired and wireless data transfer
• Vacuum suction cups included
• Shockproof plastic material

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• Calibrated according to the TERM-LAB Classic and Magnum
• Amplitude range from 110 to 190 dB
• Frequency range from 10 to 120 Hz
• ADC module and WiFi module
• Wired and wireless data transfer
• Vacuum suction cups included
• Shockproof plastic material

Install Bay PSP6

Complete ABS Port Tube Kit - 6" x 11" Port

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Complete ABS Port Tube Kit - 6" x 11" Port

• Complete Port Tube Kit
• 6" x 11" Port
• Achieve Greater Sound Pressure Levels with Less Distortion
• High Quality ABS Construction
• Mounting Hole Variations
• Designed in the U.S.A.

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• Complete Port Tube Kit
• 6" x 11" Port
• Achieve Greater Sound Pressure Levels with Less Distortion
• High Quality ABS Construction
• Mounting Hole Variations
• Designed in the U.S.A.

NVX XKIT02

Full Spec 1/0 Gauge 100% (OFC) Oxygen Free Copper Complete 2-Channel Amplifier Wiring Kit with RCA for Amplifiers up to 4000 Watts

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Full Spec 1/0 Gauge 100% (OFC) Oxygen Free Copper Complete 2-Channel Amplifier Wiring Kit with RCA for Amplifiers up to 4000 Watts

• Complete 1/0 Gauge Amplifier Installation Kit
• For Amplifiers Up To 4000 Watts RMS
• 100% (OFC) Oxygen Free Copper
• Dual Twisted Pair 2-Channel RCA Cable
• Tinned conductors for corrosion resistance
• Pre-terminated seamless power and ground ring terminals
• ANL/Mini-ANL Fuse Holder with 300 amp fuse
• CEA-2015 and BC5W2 Compliant

3+ offers available
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Save 30% off an NVX XKIT02 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT02 Amp Kit! No code needed — discount applies automatically at checkout.
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.
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2026-07-27 11:08:20
Used from: $155.99

• Complete 1/0 Gauge Amplifier Installation Kit
• For Amplifiers Up To 4000 Watts RMS
• 100% (OFC) Oxygen Free Copper
• Dual Twisted Pair 2-Channel RCA Cable
• Tinned conductors for corrosion resistance
• Pre-terminated seamless power and ground ring terminals
• ANL/Mini-ANL Fuse Holder with 300 amp fuse
• CEA-2015 and BC5W2 Compliant

Tru Spec 2X12SUPB (1545KE)

Empty Dual 12" Vented Prefabricated Enclosure

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Empty Dual 12" Vented Prefabricated Enclosure

• 12" Dual Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Total box volume: 3.50 cubic feet
• Computer-designed CNC cut

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List price $399.99
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Hertz MPCX 2 TM.3 Single

Mille Pro Series Passive Audio Crossover

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Mille Pro Series Passive Audio Crossover

• Specifically developed for Hertz MP 70.3 and Hertz MP25.3
• Two-position (0 / +2 dB) switch for tweeter level adjustments
• Pure copper wire low series resistance inductors

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• Specifically developed for Hertz MP 70.3 and Hertz MP25.3
• Two-position (0 / +2 dB) switch for tweeter level adjustments
• Pure copper wire low series resistance inductors

Limited time!

NVX VCW152 Version 3 (VCW152v3)

3000W Peak (1500W RMS) 15" VC-Series v3 Dual 2-ohm Car Subwoofer

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3000W Peak (1500W RMS) 15" VC-Series v3 Dual 2-ohm Car Subwoofer

• Peak Power: 3000 watts
• RMS Power: 1500 watts
• Impedance: Dual 2 ohm
• Carbon Fiber Enhanced Non-Pressed Paper Cone
• Custom High Roll Foam Surround with black nylon stitching
• Mount depth: 8.19"
• Sensitivity: 88 dB (1W/1m)

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List price $311.99
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JL Audio XD-CLRAIC2-SW Speaker Wire to RCA Cable

2-channel Speaker Wire to RCA Adaptor for High-Level Signal Connection to Amplifiers

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2-channel Speaker Wire to RCA Adaptor for High-Level Signal Connection to Amplifiers

• 2-Channel Speaker Wire to RCA Adaptor for High-Level Signal Connection to Amplifiers
• Left and Right Channel Male RCA Plugs to Parallel Speaker Cable
• Satin Black Jacket

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$19.99

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Only 3 Left!

• 2-Channel Speaker Wire to RCA Adaptor for High-Level Signal Connection to Amplifiers
• Left and Right Channel Male RCA Plugs to Parallel Speaker Cable
• Satin Black Jacket

Second Skin Audio SPEC-20-1GAL

1 Gallon Spray-on or Brush-on Spectrum Liquid Sound Damping

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1 Gallon Spray-on or Brush-on Spectrum Liquid Sound Damping

• 20 square feet sq. ft Sound Damping Liquid Coating
• Material Used: Vibration Dampener
• Material Thickness: 0.080"
• Install Location: Universal
• Contains 1 gallon of liquid spray

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List price $119.99
-17% $99.99

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• 20 square feet sq. ft Sound Damping Liquid Coating
• Material Used: Vibration Dampener
• Material Thickness: 0.080"
• Install Location: Universal
• Contains 1 gallon of liquid spray

Rockford Fosgate Power T1500-1BDCP

1500W RMS Class BD Power Series Monoblock Car Amplifier

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1500W RMS Class BD Power Series Monoblock Car Amplifier

• 1000 watts x 1 channel @ 4 ohm
• 1500 watts x 1 channel @ 2 ohm
• Total RMS Power: 1500 watts
• Class BD 1 ohm Stable Monoblock Amplifier

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Available Offers (2) for Rockford Fosgate Power T1500-1BDCP
FREE NVX Amp Kit at Checkout!
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Used from: $654.49

Stinger SPC505

5 Farad Pro Digital Hybrid Capacitor

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5 Farad Pro Digital Hybrid Capacitor

• Digital 5 Farad Capacitor
• Bright Red LED Voltage Display
• Monitor System Voltage
• 12-16 Volt Operation / 18 Volt Surge
• Louder And Cleaner Bass Response

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List price $599.00
-54% $274.99

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• Digital 5 Farad Capacitor
• Bright Red LED Voltage Display
• Monitor System Voltage
• 12-16 Volt Operation / 18 Volt Surge
• Louder And Cleaner Bass Response

T-Spec VPNB4

MANL 4-Position All-in-One Distribution Block

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MANL 4-Position All-in-One Distribution Block

• (2) 1/0 ga inputs for power
• (4) 4/8 ga MANL fused power outputs
• >Small Footprint with compact brass design
• All in one compact block

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• (2) 1/0 ga inputs for power
• (4) 4/8 ga MANL fused power outputs
• >Small Footprint with compact brass design
• All in one compact block

Limited time!

NVX BIR200

200-Amp High Current Dual Battery Isolator and Relay for Car Audio Systems (Handles up to 300-Amp Surge)

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200-Amp High Current Dual Battery Isolator and Relay for Car Audio Systems (Handles up to 300-Amp Surge)

• 200-Amp continuous / 300-Amp surge
• Ideal for car stereo systems and mobile electronics
• Prevents the main starter battery from draining
• 10V to 16V DC operating range

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List price $59.99
-17% $49.99

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Used from: $29.99 Like New from: $42.49

• 200-Amp continuous / 300-Amp surge
• Ideal for car stereo systems and mobile electronics
• Prevents the main starter battery from draining
• 10V to 16V DC operating range

Rockford Fosgate PMX50C

50 foot extension cable

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50 foot extension cable

• Extension Cable
• Length: 50 feet

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$129.99

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• Extension Cable
• Length: 50 feet

Limited time!

Shuriken SK-BT80-BX

Battery Box for SK-BT80

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Battery Box for SK-BT80

• Made with heavy-gauge steel
• Box is universal
• High quality at an affordable price
• Bottom of the boxes have predrilled flanges

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-10% $43.99

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• Made with heavy-gauge steel
• Box is universal
• High quality at an affordable price
• Bottom of the boxes have predrilled flanges

Limited time!

NVX XVRC2

Universal Remote Level Controller/Bass Knob with Digital Voltmeter

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Universal Remote Level Controller/Bass Knob with Digital Voltmeter

• NVX Remote Level Controller with Digital Voltmeter
• Can adjust the amplifier gain even while driving
• In-dash or Under-dash mountable
• Compatible with most head units/amplifiers combinations
• Blue LED display (high voltage / low voltage)

Purchase $400 or More of NVX and Save 15%!
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List price $99.99
-67% $32.99

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Used from: $23.09

• NVX Remote Level Controller with Digital Voltmeter
• Can adjust the amplifier gain even while driving
• In-dash or Under-dash mountable
• Compatible with most head units/amplifiers combinations
• Blue LED display (high voltage / low voltage)

Kicker 49L7X101RK

10" SoloX Series Dual 1-ohm Recone Kit for 49L7X101 Subwoofer

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10" SoloX Series Dual 1-ohm Recone Kit for 49L7X101 Subwoofer

• 10" SoloX Series Dual 1-ohm Recone Kit
• Pre-assembled cone, surround, and voice coil
• Impedance: Dual 1-ohm
• Alignment shims are included for installation

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List price $239.99
-8% $219.99

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Ships in 10-14 days

• 10" SoloX Series Dual 1-ohm Recone Kit
• Pre-assembled cone, surround, and voice coil
• Impedance: Dual 1-ohm
• Alignment shims are included for installation

Limited time!

JL Audio BassWedge CP112-W0v3

300W RMS 12" W0v3 Series BassWedge Ported Subwoofer System

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300W RMS 12" W0v3 Series BassWedge Ported Subwoofer System

• 600W Peak
• 300W RMS
• Top-Quality MDF Construction
• Durable Dark Gray Carpet Finish
• Five-Way Binding Post Connectors
• Embroidered JL Audio Logo

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List price $279.99
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-18% $229.99

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Used from: $220.87
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 S?

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