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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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Stinger SPT53102

PRO Classic Battery Terminal (1) 1/0ga + (1) 4ga + (2) 8ga Outputs Shoc-Krome (Positive)

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PRO Classic Battery Terminal (1) 1/0ga + (1) 4ga + (2) 8ga Outputs Shoc-Krome (Positive)

• Positive Battery Terminal
• Shoc-Krome-plated Output
• Impact resistant covers
• One 4 Gauge Output
• One 1/0 Gauge Output
• Two 8 Gauge Outputs

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List price $89.00
-61% $34.99

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• Positive Battery Terminal
• Shoc-Krome-plated Output
• Impact resistant covers
• One 4 Gauge Output
• One 1/0 Gauge Output
• Two 8 Gauge Outputs

Limited time!

NVX XW4WH20

20 ft 4-Gauge EnvyFlex True Spec Oxygen-Free Copper Power and Ground Wire (White)

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20 ft 4-Gauge EnvyFlex True Spec Oxygen-Free Copper Power and Ground Wire (White)

• 20 feet 4 gauge Power and Ground Wire
• Silver-tinned OFC (100% Oxygen-Free Copper) material
• Color: White

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List price $89.99
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NVX - Worth the Envy - Direct to Consumer Car Audio

Clarion CMR-10

Wired Marine Remote Control without LCD Display for Select Clarion Marine Stereos

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Wired Marine Remote Control without LCD Display for Select Clarion Marine Stereos

• Wired marine remote control without display
• Compatible with select Clarion stereos
• Easily adds up to 3 remotes
• IP67-rated water resistant design

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$99.99

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Only 1 Left!

• Wired marine remote control without display
• Compatible with select Clarion stereos
• Easily adds up to 3 remotes
• IP67-rated water resistant design

NVX XCAP1F

True 1.0 Farad 20V Capacitor with Digital Read-out, Built-in Distribution Block

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True 1.0 Farad 20V Capacitor with Digital Read-out, Built-in Distribution Block

• For Systems Up To 1200 Watts
• Bright Blue LED Voltage Display
• Improves Bass Response (SPL)

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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.
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Used from: $76.99

• For Systems Up To 1200 Watts
• Bright Blue LED Voltage Display
• Improves Bass Response (SPL)

Limited time!

NVX XPLOC4

4-Channel 600W Adjustable Line Output Converter with Remote Turn On

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4-Channel 600W Adjustable Line Output Converter with Remote Turn On

• 4-Channel Premium Adjustable Line Output Converter
• 6:1 Step Down With Adjustable Output
• 600w Total Maximum Input (150w Per Channel)
• Super Low Distortion

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• 4-Channel Premium Adjustable Line Output Converter
• 6:1 Step Down With Adjustable Output
• 600w Total Maximum Input (150w Per Channel)
• Super Low Distortion

Limited time!

NVX XWS1675

75 ft 16-Gauge EnvyFlex 100% Oxygen Free Copper (OFC) Speaker Wire (Blue/Gray)

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75 ft 16-Gauge EnvyFlex 100% Oxygen Free Copper (OFC) Speaker Wire (Blue/Gray)

• True Spec 16 gauge EnvyFlex Speaker Wire
• Silver-tinned OFC (100% Oxygen-Free Copper) material
• Color: Blue and Gray
• Twisted-pair technology eliminates noise

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List price $44.99
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• True Spec 16 gauge EnvyFlex Speaker Wire
• Silver-tinned OFC (100% Oxygen-Free Copper) material
• Color: Blue and Gray
• Twisted-pair technology eliminates noise

Heise HE-SS9

18W Universal 9" Super Slimline Series Single Row 6 LED Light Bar

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18W Universal 9" Super Slimline Series Single Row 6 LED Light Bar

• Universal 9” Single Row LED Light Bar
• Water-resistant IPX-67 Rating
• 8° Spot Beam Pattern
• Integrated epoxy-encapsulated electronics
• Includes both rear channel brackets and low profile side brackets

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List price $245.99
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• Universal 9” Single Row LED Light Bar
• Water-resistant IPX-67 Rating
• 8° Spot Beam Pattern
• Integrated epoxy-encapsulated electronics
• Includes both rear channel brackets and low profile side brackets

Cerwin-Vega RPMFMCBLK

Flat Surface Mount Bracket for Marine Wake Tower Speaker Pods (Black)

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Flat Surface Mount Bracket for Marine Wake Tower Speaker Pods (Black)

• RPM marine wake tower speakers flat mount bracket
• Designed for SMC/VMC marine tower speaker pods
• Ideal for surface or deck mounting
• Sleek black stylish finish to match factory design

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List price $83.99
-17% $69.99

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• RPM marine wake tower speakers flat mount bracket
• Designed for SMC/VMC marine tower speaker pods
• Ideal for surface or deck mounting
• Sleek black stylish finish to match factory design

Stinger SPXDMF

Male-Female Dynamic Solder Connectors with Heat Shrink for Stinger ENLIGHT10 and Race Sport COLORTRAIL LED Strip lights (8-Pack)

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Male-Female Dynamic Solder Connectors with Heat Shrink for Stinger ENLIGHT10 and Race Sport COLORTRAIL LED Strip lights (8-Pack)

• Male-female RGB solder connectors with heat sink
• Use with Stinger ENLIGHT10 and Race Sport COLORTRAIL LED Strip lights
• 8 Pack (4 male / 4 female)

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List price $39.00
-26% $29.00

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• Male-female RGB solder connectors with heat sink
• Use with Stinger ENLIGHT10 and Race Sport COLORTRAIL LED Strip lights
• 8 Pack (4 male / 4 female)

Limited time!

NVX XCAMLP

High Resolution License Plate Frame Backup Camera

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High Resolution License Plate Frame Backup Camera

• Universal Rear View Backup Camera
• Mounting Style: Full License Plate Frame
• Viewing Angle: 170 °
• Resolution: 720 x 480 
• Waterproof: Yes
• Night vision: LED's

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List price $59.99
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• Universal Rear View Backup Camera
• Mounting Style: Full License Plate Frame
• Viewing Angle: 170 °
• Resolution: 720 x 480 
• Waterproof: Yes
• Night vision: LED's

Limited time!

NVX XIV45

16.4 ft (5 meter) 4-Channel V-Series RCA Audio Interconnect Cable

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16.4 ft (5 meter) 4-Channel V-Series RCA Audio Interconnect Cable

• Shielded noise-rejecting Twisted-pair construction
• Heavy gauge OFC conductors ensure superior sound quality
• Split-tip Silver-Plated ends offer best in class signal transfer
• Molded ends equipped with colored channel identifiers

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• Shielded noise-rejecting Twisted-pair construction
• Heavy gauge OFC conductors ensure superior sound quality
• Split-tip Silver-Plated ends offer best in class signal transfer
• Molded ends equipped with colored channel identifiers

SMD Heavy Duty Quad ANL Fuse Block

Heavy Duty Four ANL Fuse Block

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Heavy Duty Four ANL Fuse Block

• For use with aftermarket sound systems or accessories like wenches
• Industrial-strength quadruple fuse holder
• Stainless steel hardware
• Also works in marine applications

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List price $83.98
-5% $79.99

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• For use with aftermarket sound systems or accessories like wenches
• Industrial-strength quadruple fuse holder
• Stainless steel hardware
• Also works in marine applications

Stinger SwitchHub (SPXSH440)

100A 4-Channel High Current Solid State Relay System

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100A 4-Channel High Current Solid State Relay System

• 4-Channel SwitchHub Solid-State Relay
• Single 40-amp output and triple 20-amp outputs
• 100-amp combined continuous capacity
• Outputs can be triggered independently

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List price $158.99
-13% $137.99

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• 4-Channel SwitchHub Solid-State Relay
• Single 40-amp output and triple 20-amp outputs
• 100-amp combined continuous capacity
• Outputs can be triggered independently

MTX Audio TNE212D

400W RMS Loaded Dual 12" Sealed Enclosure

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400W RMS Loaded Dual 12" Sealed Enclosure

• Sealed enclosure with 2 12" Terminator Series Subwoofer
• 200 watts RMS each
• Final Impedance: 2-ohm
• Dimensions: 29.63" L x 14" H x 13.5" W

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List price $249.95
-12% $219.95

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Stinger SSCap5M

Stinger Select Brushed Aluminum 5 Farad Power Capacitor w/ Digital Display

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Stinger Select Brushed Aluminum 5 Farad Power Capacitor w/ Digital Display

• 5 Farad Digital Capacitor
• Carbon Fiber Design
• 5000 Watt Systems
• Digital Display

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List price $349.00
-53% $162.99

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• 5 Farad Digital Capacitor
• Carbon Fiber Design
• 5000 Watt Systems
• Digital Display

NVX XAPK1D

Full Spec 1/0 Gauge 100% (OFC) Oxygen Free Copper Dual Amplifier Power Wiring Kit for Amplifiers up to 4000 Watts

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Full Spec 1/0 Gauge 100% (OFC) Oxygen Free Copper Dual Amplifier Power Wiring Kit for Amplifiers up to 4000 Watts

• 1/0 Gauge Dual Amplifier Power Installation Kit
• For Amplifiers Up To 4000 Watts RMS
• 100% (OFC) Oxygen Free Copper
• Tinned conductors for corrosion resistance
• Pre-terminated seamless power and ground ring terminals
• ANL/Mini-ANL Fuse Holder with 300 amp fuse
• Two brass and satin chrome distribution blocks
• CEA-2015 and BC5W2 Compliant

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List price $275.99
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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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• 1/0 Gauge Dual Amplifier Power Installation Kit
• For Amplifiers Up To 4000 Watts RMS
• 100% (OFC) Oxygen Free Copper
• Tinned conductors for corrosion resistance
• Pre-terminated seamless power and ground ring terminals
• ANL/Mini-ANL Fuse Holder with 300 amp fuse
• Two brass and satin chrome distribution blocks
• CEA-2015 and BC5W2 Compliant

Limited time!

Stinger SCBM100

100 Amp Marine Grade Circuit Breaker

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100 Amp Marine Grade Circuit Breaker

• Waterproof marine grade circuit breaker
• 100 Amp maximum current power
• Weatherproof construction
• Ignition protected

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List price $179.00
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• Waterproof marine grade circuit breaker
• 100 Amp maximum current power
• Weatherproof construction
• Ignition protected

DS18 EN-DF10A

500W Peak (250W RMS) Loaded Single Amplified 10" Sealed Enclosure

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500W Peak (250W RMS) Loaded Single Amplified 10" Sealed Enclosure

• 10" Amplified Loaded Subwoofer System
• 250 watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost: 0dB to 12dB
• Speaker-Level Inputs

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$359.95

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BOYO Vision VTM43TCA

Replacement Rear-View Mirror with 4.3" Backup Camera Monitor, Auto-Dimming, and Temperature Compass Display

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Replacement Rear-View Mirror with 4.3" Backup Camera Monitor, Auto-Dimming, and Temperature Compass Display

• Rear View Mirror with Backup Camera Monitor
• Built-in auto-dimming, temperature, and compass display
• Monitor Screen Size: 4.3"
• Monitor Screen Type: TFT LCD

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List price $468.00
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• Rear View Mirror with Backup Camera Monitor
• Built-in auto-dimming, temperature, and compass display
• Monitor Screen Size: 4.3"
• Monitor Screen Type: TFT LCD

JL Audio XB-MFBU-ANL

Master ANL Fuse Holder for 1/0 Gauge to 4 Gauge Power Wires

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Master ANL Fuse Holder for 1/0 Gauge to 4 Gauge Power Wires

• Master ANL Fuse Holder
• Maximum Input Gauge Size: 1/0 AWG
• Maximum Ouput Gauge Size: 1/0 AWG
• Total Number of Inputs: 1
• Total Number of Outputs: 1
• Brass material with marine stannum plating

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$69.99

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• Master ANL Fuse Holder
• Maximum Input Gauge Size: 1/0 AWG
• Maximum Ouput Gauge Size: 1/0 AWG
• Total Number of Inputs: 1
• Total Number of Outputs: 1
• Brass material with marine stannum plating

Limited time!

NVX VCW154v3RC

Recone Kit for VCW154v3 Version 3 Subwoofers

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Recone Kit for VCW154v3 Version 3 Subwoofers

• Kits are assembled to ensure perfect fitment and alignment
• Each kit includes all new soft moving parts
• Impedance: Dual 4-ohm
• CA glue adhesive is NOT included

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• Kits are assembled to ensure perfect fitment and alignment
• Each kit includes all new soft moving parts
• Impedance: Dual 4-ohm
• CA glue adhesive is NOT included

Viper 7701V (Requires Programming)

Remote for Viper Responder SST Car Alarm Models: 5900, 5500, 4301V, and 5301V

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Remote for Viper Responder SST Car Alarm Models: 5900, 5500, 4301V, and 5301V

• Replacement Viper Remote / LCD Pager For Select Viper Alarms

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• Replacement Viper Remote / LCD Pager For Select Viper Alarms

Limited time!

Alpine Status HDP-D90

720W RMS Class D Status Series 12-Channel Hi-Res DSP Amplifier

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720W RMS Class D Status Series 12-Channel Hi-Res DSP Amplifier

• 50 watts x 8 channel + 80 watts x 4 channel @ 4 ohm
• Total RMS Power: 720 watts
• Class D 4 ohm Stable 12-Channel Digital Sound Processor Amplifier
• High-resolution (Hi-Res) audio playback
• Selectable pre-configured sound system configurations
• Embedded RTA signals for customized sound tuning
• Bluetooth audio streaming with included external module

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List price $3480.00
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• 50 watts x 8 channel + 80 watts x 4 channel @ 4 ohm
• Total RMS Power: 720 watts
• Class D 4 ohm Stable 12-Channel Digital Sound Processor Amplifier
• High-resolution (Hi-Res) audio playback
• Selectable pre-configured sound system configurations
• Embedded RTA signals for customized sound tuning
• Bluetooth audio streaming with included external module

Stinger SI421.5

1.5 ft. of 2-Channel 4000 Series RCA Interconnect Cable

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1.5 ft. of 2-Channel 4000 Series RCA Interconnect Cable

• 2-Channel 4000 Series RCA Interconnect Cable
• 1-1/2 ft. Cable Length
• Stinger Audiophile Grade
• Twisted Pair Construction
• Clear Protective Jacket
• Compact Connector Design
• Split-Tip Connector

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List price $19.00
-47% $9.99

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• 2-Channel 4000 Series RCA Interconnect Cable
• 1-1/2 ft. Cable Length
• Stinger Audiophile Grade
• Twisted Pair Construction
• Clear Protective Jacket
• Compact Connector Design
• Split-Tip Connector

Metra 44-EC18 Antenna Extension

18" Universal Antenna Extension Cable

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18" Universal Antenna Extension Cable

Universal Antenna Extender • Extends Antenna 18" (1.5 ft.)

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List price $11.99
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Universal Antenna Extender • Extends Antenna 18" (1.5 ft.)

Limited time!

NVX XUBT4 Universal Bluetooth Receiver and Remote Control

X Series Marine Grade Bluetooth Audio Controller/Receiver with Membrane Switchpad for Cars, Trucks, Motorcycles, ATVs & Boats (X-Series)

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X Series Marine Grade Bluetooth Audio Controller/Receiver with Membrane Switchpad for Cars, Trucks, Motorcycles, ATVs & Boats (X-Series)

• Marine Grade Bluetooth Audio Controller/Receiver
• Designed for marine and powersports applications
• Bluetooth version 4.0
• Delivers CD-like sound quality wirelessly
• Membrane Switchpad

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List price $62.49
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Used from: $42.99

• Marine Grade Bluetooth Audio Controller/Receiver
• Designed for marine and powersports applications
• Bluetooth version 4.0
• Delivers CD-like sound quality wirelessly
• Membrane Switchpad

Wet Sounds ST-ADP-RND 1.75

Mounting Clamps for Stealth Soundbars with 1.75" Round Tubing

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Mounting Clamps for Stealth Soundbars with 1.75" Round Tubing

• Mounting clamp for Stealth soundbars with 1.75" round tubing
• Allows soundbar mounting to the roll cage or tower tubing
• CNC'd from billet aluminum for extra durability
• Includes mounting hardware

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$37.99

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• Mounting clamp for Stealth soundbars with 1.75" round tubing
• Allows soundbar mounting to the roll cage or tower tubing
• CNC'd from billet aluminum for extra durability
• Includes mounting hardware

Metra 40-UV43 Antenna Adapter

Connect your factory antenna to a new aftermarket radio

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Connect your factory antenna to a new aftermarket radio

• Antenna Adapter for Vehicles with Two Antennas
• 1 Male to 2 Female

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• Antenna Adapter for Vehicles with Two Antennas
• 1 Male to 2 Female

Atrend 12TKDV

Empty Dual 12" Truck Vented Subwoofer Enclosure

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Empty Dual 12" Truck Vented Subwoofer Enclosure

• 12" Dual Truck Ported Subwoofer Enclosure
• 3/4" 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: 0.69 cubic feet

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List price $209.99
-29% $149.95

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Install Bay 2" Square Terminal Cup (TCSBG2)

Square Binding Post with Gold Terminals for Subwoofer and Speaker Boxes

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Square Binding Post with Gold Terminals for Subwoofer and Speaker Boxes

• Universal square terminal cup for speaker and subwoofer boxes
• Gold-plated contacts improve signal transfer
• Installation is a breeze
• Rear connections secure with nuts
• Thumbscrew binding posts secure the connection

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• Universal square terminal cup for speaker and subwoofer boxes
• Gold-plated contacts improve signal transfer
• Installation is a breeze
• Rear connections secure with nuts
• Thumbscrew binding posts secure the connection

Viper D9957V

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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List price $399.99
-25% $299.99

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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

Atrend 12DM

Empty Dual 12" Medium Sealed Subwoofer Enclosure

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Empty Dual 12" Medium Sealed Subwoofer Enclosure

• 12" Dual Medium Sealed Subwoofer Enclosure
• 3/4" 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: 2.36 cubic feet

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List price $149.99
-27% $109.99

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Rockford Fosgate R2-1200X1 with Amplifier Wiring Kit

Rockford Fosgate 1200W Monoblock Amplifier

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Rockford Fosgate 1200W Monoblock Amplifier

• 400 Watts RMS x 1 @ 4 ohm
• 800 Watts RMS x 1 @ 2 ohm
• 1200 Watts RMS x 1 @ 1 ohm
• CEA-2006 Compliant
• R.L.C. Remote Level Control
• Includes Amplifier Wiring Kit

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List price $593.98
-11% $530.20

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• 400 Watts RMS x 1 @ 4 ohm
• 800 Watts RMS x 1 @ 2 ohm
• 1200 Watts RMS x 1 @ 1 ohm
• CEA-2006 Compliant
• R.L.C. Remote Level Control
• Includes Amplifier Wiring Kit

AmmoTenna ARMMO20

20" Universal Arrow-Style Replica Antenna Mast with Adaptors (Mossy Oak)

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20" Universal Arrow-Style Replica Antenna Mast with Adaptors (Mossy Oak)

• 20" Universal arrow-style replica antenna mast
• Made with durable fiberglass construction
• Includes 9 adapters and 2 rubber washers
• Simple screw-on installation, requires no vehicle modification
• Antenna mast color/design: Mossy Oak

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• 20" Universal arrow-style replica antenna mast
• Made with durable fiberglass construction
• Includes 9 adapters and 2 rubber washers
• Simple screw-on installation, requires no vehicle modification
• Antenna mast color/design: Mossy Oak

Kicker DL7S122 (44DL7S122)

3000W Peak (1500W RMS) Loaded Dual 12" Vented Enclosure

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3000W Peak (1500W RMS) Loaded Dual 12" Vented Enclosure

• Ported enclosure with 2 12" Solo-Baric L7S Series Subwoofer
• 1500 watts RMS (3000 watts Peak)
• Final Impedance: 2-ohm
• Dimensions: 33-3/4" L x 16" H x 16-1/4" W x 19-1/2" W2

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Atrend 10TKLV

Empty Single 10" Truck Large Vented Subwoofer Enclosure

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Empty Single 10" Truck Large Vented Subwoofer Enclosure

• 10" Single Truck Large Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Universal truck (wedge) enclosure design
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 0.51 cubic feet

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Tru Spec 6.5" Speaker Rings

6.5" MDF Speaker Rings (1 Pair) Tru Spec Series (Made in the USA)

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6.5" MDF Speaker Rings (1 Pair) Tru Spec Series (Made in the USA)

• Material: 0.75" MDF
• Inner Diameter: 5.85"
• Outer Diameter: 7.5"

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List price $12.99
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• Material: 0.75" MDF
• Inner Diameter: 5.85"
• Outer Diameter: 7.5"

Stinger SPF52200

Platinum Plated ANL 200 Amp Fuse

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Platinum Plated ANL 200 Amp Fuse

• High Conductivity Platinum Plating
• Maximum Current Transfer
• 200 Amp Rating
• ANL Style Fuse
• 1 Pack

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• High Conductivity Platinum Plating
• Maximum Current Transfer
• 200 Amp Rating
• ANL Style Fuse
• 1 Pack

DS18 EN6P (Sold by Pair)

Empty 2-Way Universal Pods for 6.5" Loudspeaker and 1.5" Tweeter

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Empty 2-Way Universal Pods for 6.5" Loudspeaker and 1.5" Tweeter

• Pair of 2-Way Universal Pod for 6.5" loudspeaker and 1.5" tweeter
• Enclosure comes in 1 set (left and right)
• Injected high density ABS plastic construction
• UV protected and all-element ready

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$153.95

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Only 1 Left!

• Pair of 2-Way Universal Pod for 6.5" loudspeaker and 1.5" tweeter
• Enclosure comes in 1 set (left and right)
• Injected high density ABS plastic construction
• UV protected and all-element ready

Stinger SI623

3 Ft 2-Channel 6000 Series Audiophile Grade RCA Interconnect Cable

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3 Ft 2-Channel 6000 Series Audiophile Grade RCA Interconnect Cable

• 2-Channel 6000 Series RCA Interconnect Cable
• 3 ft. Cable Length
• Stinger Audiophile Grade
• Twisted Pair Construction
• Blue Protective Jacket
• Mylar Shielding
• Split-Tip Connector
• Molded Strain Reliefs

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-56% $16.99

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• 2-Channel 6000 Series RCA Interconnect Cable
• 3 ft. Cable Length
• Stinger Audiophile Grade
• Twisted Pair Construction
• Blue Protective Jacket
• Mylar Shielding
• Split-Tip Connector
• Molded Strain Reliefs

NVX - Worth the Envy - Direct to Consumer Car Audio

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    FAQ for Universal-Fit Audio & Electronics in 1981 4000 S

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

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

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