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2021 Audi A8 Quattro

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 2021 Audi A8 Quattro

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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i-Beam TE-360-3D

Full-Car Coverage Camera and DVR System w/ 3D View and Backup Camera Features

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Full-Car Coverage Camera and DVR System w/ 3D View and Backup Camera Features

• 360 Degree Camera System
• Backup Camera Included
• DVR Records from All Four Cameras
• 3d Overhead View Available

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List price $1496.00
-20% $1,199.99

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• 360 Degree Camera System
• Backup Camera Included
• DVR Records from All Four Cameras
• 3d Overhead View Available

NVX VADM4 v2 (VADM4v2)

500W RMS Class D V-Series Micro Full-Range 4-Channel Car/Marine/Powersports Amplifier

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500W RMS Class D V-Series Micro Full-Range 4-Channel Car/Marine/Powersports Amplifier

• 80 watts x 4 channel @ 4 ohm
• 125 watts x 4 channel @ 2 ohm
• Bridged: 250 watts x 2 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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Available Offers (2) for NVX VADM4 v2 (VADM4v2)
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List price $239.99
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$178.49 with coupon | Price details
2026-06-30 23:59:00
Save 30% off an NVX XKIT84 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT84 Amp Kit! No code needed — discount applies automatically at checkout.
Used from: $136.49

Metra 82-6900

1.5" Spacer Ring for 6x9" Speakers

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1.5" Spacer Ring for 6x9" Speakers

• 6" x 9" Universal Speaker Spacers / Depth Extenders
• Adds 1-1/2" depth to speakers
• Items that make the installer's Life easier
• Trimrings and Trimplates
• Speaker Grills
• Speaker Adapter plates

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• 6" x 9" Universal Speaker Spacers / Depth Extenders
• Adds 1-1/2" depth to speakers
• Items that make the installer's Life easier
• Trimrings and Trimplates
• Speaker Grills
• Speaker Adapter plates

Cobra PX650-BCH6

Splashproof Pro Business 2-Way Walkie Talkies (6-Pack)

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Splashproof Pro Business 2-Way Walkie Talkies (6-Pack)

• Pro Business 2-Way Walkie Talkies
• IP54-rated splashproof and weather-resistant
• 22 Channels and 88 Privacy Codes
• Voice-Activated Transmission (VOX)
• 18-hour lithium-ion battery

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$299.95

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• Pro Business 2-Way Walkie Talkies
• IP54-rated splashproof and weather-resistant
• 22 Channels and 88 Privacy Codes
• Voice-Activated Transmission (VOX)
• 18-hour lithium-ion battery

Viper 7756V

2-Way LCD Replacement Remote Control

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2-Way LCD Replacement Remote Control

• 2-Way Replacement Remote
• 5-Button Transmitter
• 1 Mile Range
• Color: Black

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-22% $179.99

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Only 2 Left!

• 2-Way Replacement Remote
• 5-Button Transmitter
• 1 Mile Range
• Color: Black

Stinger SGP901501

150 AMP Circuit Breaker with Manual Reset

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150 AMP Circuit Breaker with Manual Reset

• Manual Reset Circuit Breaker
• Power Rating: 150 Amps
• Push Button Reset
• Water Resistant Housing
• Integrated Holes for Simple Mounting
• Compact and Lightweight Design

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List price $139.00
-53% $65.99

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• Manual Reset Circuit Breaker
• Power Rating: 150 Amps
• Push Button Reset
• Water Resistant Housing
• Integrated Holes for Simple Mounting
• Compact and Lightweight Design

Limited time!

NVX NDA6004

1200W Peak (600W RMS) Class D N-Series 4-Channel Amplifier

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1200W Peak (600W RMS) Class D N-Series 4-Channel Amplifier

• 100 watts x 4 channel @ 4 ohm
• 160 watts x 4 channel @ 2 ohm
• Bridged: 320 watts x 2 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Save 30% off an NVX XKIT44 Amp Kit at Checkout!
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NVX XKIT44

$119.99

$83.99

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Works with all subwoofer and speaker enclosures.

Universal Round Chrome-plated Terminal Cup for Speaker / Subwoofer Boxes
• Chrome-Plated Contacts
• Screw Binding Posts
• Easy to Install and Use

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Universal Round Chrome-plated Terminal Cup for Speaker / Subwoofer Boxes
• Chrome-Plated Contacts
• Screw Binding Posts
• Easy to Install and Use

Metra 82-6902

Universal 1/2" Spacer for 6x9" Speakers

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Universal 1/2" Spacer for 6x9" Speakers

• Universal 1/2" Speaker Spacers
• Fits 6" x 9" Speakers
• OEM Automotive Grade ABS Plastic Construction
• Color: Black

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• Universal 1/2" Speaker Spacers
• Fits 6" x 9" Speakers
• OEM Automotive Grade ABS Plastic Construction
• Color: Black

2 Pack of 300 Amp Nickel-Plated ANL Fuse (Belva BANL300)

Two fuses per order. High quality 300 Amp ANL Fuses

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Two fuses per order. High quality 300 Amp ANL Fuses

• 300A ANL Fuse
• 2 Pack
• Nickel Plated
• Resealable Polybag
• Heavy Duty Construction

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• 300A ANL Fuse
• 2 Pack
• Nickel Plated
• Resealable Polybag
• Heavy Duty Construction

Limitless Lithium LL3.5A-MTN-HV

3.5A 15V Portable Automatic Smart Lithium High Voltage Maintainer

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3.5A 15V Portable Automatic Smart Lithium High Voltage Maintainer

• Portable Automatic Smart Lithium High Voltage Maintainer
• Lithium LTO Battery Maintainer 3.5 Amp
• Designed for charging 15 volts batteries
• Shuts off when the battery is charged
• Can be used as a "Maintainer" for all LTO and high voltage lithium batteries

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$89.00

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Ships in 10-14 days

• Portable Automatic Smart Lithium High Voltage Maintainer
• Lithium LTO Battery Maintainer 3.5 Amp
• Designed for charging 15 volts batteries
• Shuts off when the battery is charged
• Can be used as a "Maintainer" for all LTO and high voltage lithium batteries

2 Pack of 200 Amp Nickel-Plated ANL Fuse (Belva BANL200)

Two fuses per order. High quality 200 Amp ANL Fuses

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Two fuses per order. High quality 200 Amp ANL Fuses

• 200A ANL Fuse
• 2 Pack
• Nickel Plated
• Resealable Polybag
• Heavy Duty Construction

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• 200A ANL Fuse
• 2 Pack
• Nickel Plated
• Resealable Polybag
• Heavy Duty Construction

Limited time!

NVX VCW124 Version 3 (VCW124v3)

2400W Peak (1200W RMS) 12" VC-Series v3 Dual 4-ohm Car Subwoofer

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2400W Peak (1200W RMS) 12" VC-Series v3 Dual 4-ohm Car Subwoofer

• Peak Power: 2400 watts
• RMS Power: 1200 watts
• Impedance: Dual 4 ohm
• Carbon Fiber Enhanced Non-Pressed Paper Cone
• Custom High Roll Foam Surround with black nylon stitching
• Mount depth: 7.02"
• Sensitivity: 85 dB (1W/1m)

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-17% $239.99

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Belva BTK112

12-Piece Installer's Master Panel Removal Tool Kit

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12-Piece Installer's Master Panel Removal Tool Kit

• 12 Piece Installers Removal Tool Kit
• Made From Nylon Plastic and Metal
• Includes with Ford Removal Keys and Euro Radio Removal Keys
• Various Shapes and Sizes for Different Needs

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• 12 Piece Installers Removal Tool Kit
• Made From Nylon Plastic and Metal
• Includes with Ford Removal Keys and Euro Radio Removal Keys
• Various Shapes and Sizes for Different Needs

Dynamat Xtreme License Plate Kit 19100

Dynamat Extreme 19100 License Plate Kit

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Dynamat Extreme 19100 License Plate Kit

• Dynamat Xtreme License Plate Kit
• One 4" x 10" Sheet
• Includes License Plate Frame with Dynamat Logo
• Four Self Adhesive Neoprene Foam Gaskets
• Used on the Back of the License Plate

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• Dynamat Xtreme License Plate Kit
• One 4" x 10" Sheet
• Includes License Plate Frame with Dynamat Logo
• Four Self Adhesive Neoprene Foam Gaskets
• Used on the Back of the License Plate

AudioControl LC2i PRO

2-Channel 400W Line Output Converter with AccuBASS and ACR-1 Remote

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2-Channel 400W Line Output Converter with AccuBASS and ACR-1 Remote

• 2-Channel Line Out Converter
• AccuBASS processing for correction of bass roll-off
AudioControl ACR-1 REMOTE wired bass remote knob included

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• 2-Channel Line Out Converter
• AccuBASS processing for correction of bass roll-off
AudioControl ACR-1 REMOTE wired bass remote knob included

Belva BAK82

8 Gauge Premium (CCA) Copper Clad Aluminum Complete 2-Channel Amplifier Wiring Kit with RCA for Amplifiers up to 600 Watts - RED

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8 Gauge Premium (CCA) Copper Clad Aluminum Complete 2-Channel Amplifier Wiring Kit with RCA for Amplifiers up to 600 Watts - RED

• Complete 8 Gauge Amplifier Installation Kit
• For Amplifiers Up To 600 Watts RMS
• Premium (CCA) Copper Clad Aluminum
• Helical Twist 2-Channel RCA Cable
• ANL/Mini-ANL Fuse Holder with 60 amp fuse
• Complies to American Wire Gauge standards

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NVX NDA12001

2400W Peak (1200W RMS) Class D N-Series Monoblock Car Amplifier with Bass Remote

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2400W Peak (1200W RMS) Class D N-Series Monoblock Car Amplifier with Bass Remote

• 500 watts x 1 channel @ 4 ohm
• 850 watts x 1 channel @ 2 ohm
• 1200 watts x 1 channel @ 1 ohm
• Total RMS Power: 1200 watts
• Class D 1 ohm Stable Monoblock Amplifier

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Stinger SGP90300

High Power 300 Amp Circuit Breaker w/ Built-In Distribution

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High Power 300 Amp Circuit Breaker w/ Built-In Distribution

• 300 AMP Circuit Breaker
• Input Gauge Size: 0 to 4 AWG
• Maximum Output Gauge: 4 AWG

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• 300 AMP Circuit Breaker
• Input Gauge Size: 0 to 4 AWG
• Maximum Output Gauge: 4 AWG

AudioControl AC-LGD 20

Load Generating Device and Signal Stabilizers for Non-Amplified Chrysler, Dodge, Jeep and Maserati Sound Systems

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Load Generating Device and Signal Stabilizers for Non-Amplified Chrysler, Dodge, Jeep and Maserati Sound Systems

• Load Generating Device and Signal Stabilizers
• Designed for non-amplified Dodge, Chrysler, Jeep and Maserati sound systems
• Generates load and stabilize signal from a non-amplified factory system
• Operating Impedance: 20 ohms

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• Load Generating Device and Signal Stabilizers
• Designed for non-amplified Dodge, Chrysler, Jeep and Maserati sound systems
• Generates load and stabilize signal from a non-amplified factory system
• Operating Impedance: 20 ohms

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    Q: Can I upgrade or change the Universal-Fit Audio & Electronics in 2021 Audi A8 Quattro?

    A: Yes this page includes all the best Universal-Fit Audio & Electronics that work in your A8 Quattro.

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

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    Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.