Garage
Shop

2008 Audi A4

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 2008 Audi A4

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.

Loading...
Filters

We are sorry, no available results!

filter-icon Filters & Sort

DS18 SQT1

120W Peak (30W RMS) 1.3" Multi-Mount 4-ohm Dome Tweeters

SQT1 big
Go to item page Right Arrow Icon of Right Arrow

120W Peak (30W RMS) 1.3" Multi-Mount 4-ohm Dome Tweeters

• 1.3" Tweeters
• 60 watts Peak Each
• 15 watts RMS Each
• 4 ohm Impedance

shipping truck icon Free shipping in USA. Provide zip for delivery date.
install icon

Install kits available for most vehicles

found car based on your search
Fits multiple locations in your A4
List price $57.99
-17% $47.95 /pair

In stock.

• 1.3" Tweeters
• 60 watts Peak Each
• 15 watts RMS Each
• 4 ohm Impedance

Install Bay IBSBF65

2 Piece Speaker Baffle Kit 6.5 Inch - Pkg/Pair

IBSBF65 big
Go to item page Right Arrow Icon of Right Arrow

2 Piece Speaker Baffle Kit 6.5 Inch - Pkg/Pair

• New design silicone with egg wave foam
• Foldable speaker baffle
• No more trimming or cutting
• Better sealing for better sound

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
3
List price $46.99
-11% $41.99

Available

Ships in 10-14 days

• New design silicone with egg wave foam
• Foldable speaker baffle
• No more trimming or cutting
• Better sealing for better sound

DS18 PRO-SDF8

8" Square Bolt-on Midrange Speaker Diffuser Horn

PRO-SDF8 big
Go to item page Right Arrow Icon of Right Arrow

8" Square Bolt-on Midrange Speaker Diffuser Horn

• 8" loudspeaker horn diffuser
• Comes with 4-M4 Nut-Inserts
• Bolt-on installation type
• 90° rounded sound coverage
• Made with durable ABS plastic

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
List price $71.99
-17% $59.95

In stock.

• 8" loudspeaker horn diffuser
• Comes with 4-M4 Nut-Inserts
• Bolt-on installation type
• 90° rounded sound coverage
• Made with durable ABS plastic

DS18 PRO-SDF6

6.5" Square Bolt-on Midrange Speaker Diffuser Horn

PRO-SDF6 big
Go to item page Right Arrow Icon of Right Arrow

6.5" Square Bolt-on Midrange Speaker Diffuser Horn

• 6.5" loudspeaker horn diffuser
• Comes with 4-M4 Nut-Inserts
• Bolt-on installation type
• 90° rounded sound coverage
• Made with durable ABS plastic

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
List price $53.99
-17% $44.95

Available

Ships in 10-14 days

• 6.5" loudspeaker horn diffuser
• Comes with 4-M4 Nut-Inserts
• Bolt-on installation type
• 90° rounded sound coverage
• Made with durable ABS plastic

DS18 DXTC

200W Peak (50W RMS) 2" 4-ohm Dome Tweeters with External Passive Crossover

DXTC big
Go to item page Right Arrow Icon of Right Arrow

200W Peak (50W RMS) 2" 4-ohm Dome Tweeters with External Passive Crossover

• 2" Tweeters
• 100 watts Peak Each
• 25 watts RMS Each
• 4 ohm Impedance

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $48.00 in rewards to spend later

install icon

Install kits available for most vehicles

found car based on your search
Fits multiple locations in your A4
List price $575.99
-17% $479.95 /pair

In stock.

• 2" Tweeters
• 100 watts Peak Each
• 25 watts RMS Each
• 4 ohm Impedance

Install Bay IBSBF65-B

2 Piece Speaker Baffle Kit 6.5 Inch - 10 Pair Bulk Pack

IBSBF65-B big
Go to item page Right Arrow Icon of Right Arrow

2 Piece Speaker Baffle Kit 6.5 Inch - 10 Pair Bulk Pack

• 2 Piece Speaker Baffle Kit 6.5 Inch
• 10 Pair Bulk Pack
• Designed to improve the directional flow of sound waves and focus them into the cabin
• Perfectly seals the speaker against the interior panel
• Offers waterproof protection for the speakers
• Better sealing for better sound

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $33.40 in rewards to spend later

found car based on your search
Fits your A4
List price $371.99
-10% $333.99

Available

Ships in 10-14 days

• 2 Piece Speaker Baffle Kit 6.5 Inch
• 10 Pair Bulk Pack
• Designed to improve the directional flow of sound waves and focus them into the cabin
• Perfectly seals the speaker against the interior panel
• Offers waterproof protection for the speakers
• Better sealing for better sound

NVX XBAF65 (Open Box, Great)

2 Piece 6.5" or 6.75" Weatherproof Silicone Rubber Speaker Baffle Kit

XBAF65 big
Go to item page Right Arrow Icon of Right Arrow

2 Piece 6.5" or 6.75" Weatherproof Silicone Rubber Speaker Baffle Kit

• Acoustically seals speakers for better sound performance
• Prevents front and rear wave cancellation
• Reduces panels vibrations
• Foldable design allows for varying depths

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
2
List price $34.99
-56% $15.39

In stock

• Acoustically seals speakers for better sound performance
• Prevents front and rear wave cancellation
• Reduces panels vibrations
• Foldable design allows for varying depths

Limited time!

NVX XBAF65 Premium Speaker Accessory Kit

2 Piece 6.5" / 6.75" Weatherproof Silicone Rubber Speaker Baffle Kit + NVX SDBSK2 Premium Sound Damping

XBAF65_SDBSK2_ACC_KIT big
Go to item page Right Arrow Icon of Right Arrow

2 Piece 6.5" / 6.75" Weatherproof Silicone Rubber Speaker Baffle Kit + NVX SDBSK2 Premium Sound Damping

• Acoustically seals speakers for better sound performance
• Prevents front and rear wave cancellation
• Reduces panels vibrations
• Foldable design allows for varying depths

Free Speaker Accessory Kit at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
163
List price $53.73
-35% $34.99

In stock

NVX FRING65 (Like New (Open Box))

2 Piece 6.5" / 6.75" Self-Adhesive Foam Speaker Ring Baffle Kit

FRING65 big
Go to item page Right Arrow Icon of Right Arrow

2 Piece 6.5" / 6.75" Self-Adhesive Foam Speaker Ring Baffle Kit

• Acoustically seals speakers for better sound performance
• Prevents front and rear wave cancellation
• Reduces panels vibrations
• Easy peel and stick installation

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
List price $19.99
-24% $15.29

In stock

Only 2 Left!

• Acoustically seals speakers for better sound performance
• Prevents front and rear wave cancellation
• Reduces panels vibrations
• Easy peel and stick installation

NVX XBAF65 (Like New (Open Box))

2 Piece 6.5" or 6.75" Weatherproof Silicone Rubber Speaker Baffle Kit

XBAF65 big
Go to item page Right Arrow Icon of Right Arrow

2 Piece 6.5" or 6.75" Weatherproof Silicone Rubber Speaker Baffle Kit

• Acoustically seals speakers for better sound performance
• Prevents front and rear wave cancellation
• Reduces panels vibrations
• Foldable design allows for varying depths

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
List price $34.99
-49% $17.99

In stock

Only 3 Left!

• Acoustically seals speakers for better sound performance
• Prevents front and rear wave cancellation
• Reduces panels vibrations
• Foldable design allows for varying depths

NVX XBAF525 (Open Box, Great)

2 Piece Universal 5.25” Silicone Rubber Speaker Baffles with Self Adhesive Foam Base Pad

XBAF525 big
Go to item page Right Arrow Icon of Right Arrow

2 Piece Universal 5.25” Silicone Rubber Speaker Baffles with Self Adhesive Foam Base Pad

• Foldable Silicone with egg crate foam
• Creates a tight seal around your speaker for optimum sound quality
• Waterproof material
• The foam baffles from the competitors will deteriorate over time, while the rubber XBAF525's will last a lifetime

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
List price $19.99
-34% $13.29

In stock

Only 2 Left!

• Foldable Silicone with egg crate foam
• Creates a tight seal around your speaker for optimum sound quality
• Waterproof material
• The foam baffles from the competitors will deteriorate over time, while the rubber XBAF525's will last a lifetime

NVX XBAF8 (Open Box, Great)

2 Piece Universal 8” Silicone Rubber Speaker Baffles with Self Adhesive Foam Base Pad

XBAF8 big
Go to item page Right Arrow Icon of Right Arrow

2 Piece Universal 8” Silicone Rubber Speaker Baffles with Self Adhesive Foam Base Pad

• Foldable Silicone with egg crate foam
• Creates a tight seal around your speaker for optimum sound quality
• Waterproof material
• The foam baffles from the competitors will deteriorate over time, while the rubber XBAF8's will last a lifetime

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
List price $29.99
-53% $13.99

In stock

• Foldable Silicone with egg crate foam
• Creates a tight seal around your speaker for optimum sound quality
• Waterproof material
• The foam baffles from the competitors will deteriorate over time, while the rubber XBAF8's will last a lifetime

NVX XBAF525 (Open Box, Good)

2 Piece Universal 5.25” Silicone Rubber Speaker Baffles with Self Adhesive Foam Base Pad

XBAF525 big
Go to item page Right Arrow Icon of Right Arrow

2 Piece Universal 5.25” Silicone Rubber Speaker Baffles with Self Adhesive Foam Base Pad

• Foldable Silicone with egg crate foam
• Creates a tight seal around your speaker for optimum sound quality
• Waterproof material
• The foam baffles from the competitors will deteriorate over time, while the rubber XBAF65's will last a lifetime

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
List price $19.99
-43% $11.39

In stock

Only 2 Left!

• Foldable Silicone with egg crate foam
• Creates a tight seal around your speaker for optimum sound quality
• Waterproof material
• The foam baffles from the competitors will deteriorate over time, while the rubber XBAF65's will last a lifetime

NVX XBAF8 (Open Box, Good)

2 Piece Universal 8” Silicone Rubber Speaker Baffles with Self Adhesive Foam Base Pad

XBAF8 big
Go to item page Right Arrow Icon of Right Arrow

2 Piece Universal 8” Silicone Rubber Speaker Baffles with Self Adhesive Foam Base Pad

• Foldable Silicone with egg crate foam
• Creates a tight seal around your speaker for optimum sound quality
• Waterproof material
• The foam baffles from the competitors will deteriorate over time, while the rubber XBAF8's will last a lifetime

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
List price $29.99
-33% $19.99

In stock

• Foldable Silicone with egg crate foam
• Creates a tight seal around your speaker for optimum sound quality
• Waterproof material
• The foam baffles from the competitors will deteriorate over time, while the rubber XBAF8's will last a lifetime

NVX XBAF8 (Like New (Open Box))

2 Piece Universal 8” Silicone Rubber Speaker Baffles with Self Adhesive Foam Base Pad

XBAF8 big
Go to item page Right Arrow Icon of Right Arrow

2 Piece Universal 8” Silicone Rubber Speaker Baffles with Self Adhesive Foam Base Pad

• Foldable Silicone with egg crate foam
• Creates a tight seal around your speaker for optimum sound quality
• Waterproof material
• The foam baffles from the competitors will deteriorate over time, while the rubber XBAF8's will last a lifetime

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
List price $29.99
-35% $19.54

In stock

• Foldable Silicone with egg crate foam
• Creates a tight seal around your speaker for optimum sound quality
• Waterproof material
• The foam baffles from the competitors will deteriorate over time, while the rubber XBAF8's will last a lifetime

NVX FRING525 (Open Box, Great)

2 Piece 5.25" Self-Adhesive Foam Speaker Ring Baffle Kit

FRING525 big
Go to item page Right Arrow Icon of Right Arrow

2 Piece 5.25" Self-Adhesive Foam Speaker Ring Baffle Kit

• Acoustically seals speakers for better sound performance
• Prevents front and rear wave cancellation
• Reduces panels vibrations
• Easy peel and stick installation

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
List price $19.99
-62% $7.69

In stock

Only 2 Left!

• Acoustically seals speakers for better sound performance
• Prevents front and rear wave cancellation
• Reduces panels vibrations
• Easy peel and stick installation

NVX XBAF65 Baffle Accessory Kit

6.5" Weatherproof Silicone Rubber Speaker Baffle Kit and Sound Damping Speaker Kit (Two 10" x 10" Pieces)

xbaf65_sdsk2_bacc_kit big
Go to item page Right Arrow Icon of Right Arrow

6.5" Weatherproof Silicone Rubber Speaker Baffle Kit and Sound Damping Speaker Kit (Two 10" x 10" Pieces)

• Acoustically seals speakers for better sound performance
• Prevents front and rear wave cancellation
• Reduces panels vibrations
• Foldable design allows for varying depths

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
163
List price $53.73
-35% $34.99

In stock

• Acoustically seals speakers for better sound performance
• Prevents front and rear wave cancellation
• Reduces panels vibrations
• Foldable design allows for varying depths

NVX FRING65 Basic Speaker Accessory Kit

2 Piece 6.5" / 6.75" Self-Adhesive Foam Speaker Ring Baffle Kit with 1.38 Square Feet of Sound Dampening Material (Two 10" x 10" Pieces)

FRING65_SDSK2_ACC_KIT big
Go to item page Right Arrow Icon of Right Arrow

2 Piece 6.5" / 6.75" Self-Adhesive Foam Speaker Ring Baffle Kit with 1.38 Square Feet of Sound Dampening Material (Two 10" x 10" Pieces)

• Acoustically seals speakers for better sound performance
• Prevents front and rear wave cancellation
• Reduces panels vibrations
• Easy peel and stick installation

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
90
List price $38.73
-23% $29.99

In stock

NVX FRING65 Basic Speaker Installation Kit

2 Piece 6.5" / 6.75" Self-Adhesive Foam Speaker Ring Baffle Kit + 2 Sheets Sound Dampening Material and Roller with 6 Piece Removal Tool Kit

FRING65_K2_R1_06_INST_KIT big
Go to item page Right Arrow Icon of Right Arrow

2 Piece 6.5" / 6.75" Self-Adhesive Foam Speaker Ring Baffle Kit + 2 Sheets Sound Dampening Material and Roller with 6 Piece Removal Tool Kit

• Acoustically seals speakers for better sound performance
• Prevents front and rear wave cancellation
• Reduces panels vibrations
• Easy peel and stick installation

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
261
List price $72.71
-26% $53.99

In stock

NVX XBAF8 Premium Speaker Accessory Kit

2 Piece Universal 8” Silicone Rubber Speaker Baffles with Self Adhesive Foam Base Pad + NVX SDBSK2 Premium Sound Damping

XBAF8_SDBSK2_ACC_KIT big
Go to item page Right Arrow Icon of Right Arrow

2 Piece Universal 8” Silicone Rubber Speaker Baffles with Self Adhesive Foam Base Pad + NVX SDBSK2 Premium Sound Damping

• Foldable Silicone with egg crate foam
• Creates a tight seal around your speaker for optimum sound quality
• Waterproof material
• The foam baffles from the competitors will deteriorate over time, while the rubber XBAF8's will last a lifetime

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
49
List price $48.73
-26% $35.99

In stock

Items per page: 20 40 60

    Clear all
    why-shoping-with-sonic

    We love people and we're ready to help you! See what separates us from our competition.

    Take advantage of our VIP rewards like 10% back on your purchases, free 2-day shipping, extended warranties, and free returns! Gain access to all of these rewards without any membership fees.
    Get great discounted (and possibly FREE) installation accessories with most car stereo purchases. This includes dash kits, wiring harnesses and antenna adapters that you will need to properly install your new car stereo.
    We are an Authorized Dealer for all the brands we sell, including the most premium brands in car and marine audio such as Hertz, JL Audio, NVX, Rockford Fosgate, Kicker, Alpine, Kenwood and many more.
    Shop Deals and get up to 30% off premium brands! Shop Now! We are always looking out for the best products and deals to offer our customers. Don’t pay too much by shopping elsewhere!
    We have information on brands, gear, and more for you to explore! Check out our YouTube Channel for helpful how-to videos, product reviews, and Q&As. For a more detailed look, also visit our Learning Center!
    Our trained experts are here to assist you! They are just a phone call or click away to help you get the right gear for you and your vehicle!
    Why Shop With Us?
    FAQ for Universal-Fit Audio & Electronics in 2008 A4

    Q: Can I upgrade or change the Universal-Fit Audio & Electronics in 2008 Audi A4?

    A: Yes this page includes all the best Universal-Fit Audio & Electronics that work in your A4.

    Save up to 10 different vehicles in your garage
    Vehicle
    Store
    Delete

    2003 Ford Excursion

    1985 Ford EXP

    2008 Audi A4

    2021 Subaru Forester

    1985 Dodge B Series

    1969 Cadillac DeVille

    2022 Ford E Series

    2007 Mazda CX-7

    2013 Ram C/V

    2024 Genesis G90

    Add vehicle Clear all vehicles
    Where to find vehicle info
    Are you sure you want to clear your garage?
    This action cannot be undone. Confirm
    This category was not designed for products.
    If you continue, you will be redirected to a category customized for your vehicle. Continue
    Loading...
    Identify your vehicle and submodel details
    • Owner's manual
    • Vehicle's insurance card
    • Vehicle registration
    • Vehicle produced after 2005: Inside driver's side door
    • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
    Car Info Side Door Icon
    Vehicle Registration Icon
    Vehicle Insurance Icon

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

    • You see only parts engineered for your exact vehicle
    • You avoid incompatible radios, speakers, or wiring
    • Installation is smoother, faster, and frustration-free
    • You get the correct accessories the first time

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