Garage
Shop

All Infinity Car Speakers for your 1998 A4 close

For consistent, high-quality sound, choose Infinity All Car Speakers.

Exclamation Icon It’s a no-brainer.
Get your speakers here.

Install kit discounts · Guaranteed fit · Full warranty
Loading...
Filters

Your Vehicle


Checkmark Icon
Fits select locations in your 1998 A4
Add vehicle details to confirm exact location or Update vehicle.

Update vehicle | Remove vehicle | Vehicle store

Shop the Category

filter-icon Filters & Sort

Infinity Reference 5030cx (REF5030CX)

390W Peak (130W RMS) 5.25" Reference Series 2-Way 3-ohm Component Speaker System

Reference 5030cx big
Go to item page Right Arrow Icon of Right Arrow

390W Peak (130W RMS) 5.25" Reference Series 2-Way 3-ohm Component Speaker System

• 195 watts Peak Each, 65 watts RMS Each
• 3/4" Textile Edge Driven Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

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

Save up to $13 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
2
List price $249.95
-60% $99.95 /set

In stock

Used from: $139.99
Limited time!

Infinity REF507CF (INFSPKRF507CFUS)

390W Peak (130W RMS) 5.25" Reference Series 2-Way 3-ohm Component Speaker System

REF507CF big
Go to item page Right Arrow Icon of Right Arrow

390W Peak (130W RMS) 5.25" Reference Series 2-Way 3-ohm Component Speaker System

• 195 watts Peak Each, 65 watts RMS Each
• 3/4" Textile Edge Driven Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

Free Speaker Accessory at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $22.00 in rewards to spend later

install icon

Save up to $13 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
List price $249.95
-12% $219.95 /set

In stock

Limited time!

Infinity Kappa 63XF (INFSPKKA63XFAM)

510W Peak (170W RMS) 6.5" Kappa Series 2 Way Coaxial 3-ohm Speakers

Kappa 63XF big
Go to item page Right Arrow Icon of Right Arrow

510W Peak (170W RMS) 6.5" Kappa Series 2 Way Coaxial 3-ohm Speakers

• 255 watts Peak Each, 85 watts RMS Each
• Silk Edge Driven Dome 40kHz high-resolution unipivot tweeters
• Glass Fiber cone material with Plus One woofer cone architecture
• Impedance: 3 ohm
• Sensitivity: 93 dB

Free Baffles with Select Speakers Shop deal
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $20.00 in rewards to spend later

install icon

Save up to $23 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
10
List price $299.95
Save $100.00
-33% $199.95 /pair

In stock

Only 3 Left!

Limited time!

Infinity Primus 503CF (PR503CF)

300W Peak (100W RMS) 5.25” Primus Series 2 Way 3-ohm Component Speaker System

PR503CF big
Go to item page Right Arrow Icon of Right Arrow

300W Peak (100W RMS) 5.25” Primus Series 2 Way 3-ohm Component Speaker System

• 150 watts Peak Each, 50 watts RMS Each
• 3/4" Silk Edge Driven Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 91 dB

Free Speaker Accessory at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $12.00 in rewards to spend later

install icon

Save up to $3 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
1
List price $149.95
-20% $119.95 /set

In stock

Limited time!

Infinity Kappa 503CF (INFSPKKA503CFAM)

480W Peak (160W RMS) 5.25" Kappa Series 2-Way Component 3-ohm Speaker System

Kappa 503CF big
Go to item page Right Arrow Icon of Right Arrow

480W Peak (160W RMS) 5.25" Kappa Series 2-Way Component 3-ohm Speaker System

• 240 watts Peak Each, 80 watts RMS Each
• 3/4" Silk Edge Driven Dome uni-pivot and angled tweeters
• Glass Fiber cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

Free Speaker Accessory at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $28.00 in rewards to spend later

install icon

Install kits available for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
1
List price $449.95
Save $169.96
-38% $279.99 /set

In stock

Used from: $279.30
Limited time!

Infinity Reference REF-4032cfx (REF4032CFXAM)

210W Peak (70W RMS) 4" Reference Series 2 Way Coaxial 3-ohm Speakers

REF4032CFXAM big
Go to item page Right Arrow Icon of Right Arrow

210W Peak (70W RMS) 4" Reference Series 2 Way Coaxial 3-ohm Speakers

• 105 watts Peak Each, 35 watts RMS Each
• 1" Textile Balanced Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 92 dB

Free Speaker Accessory at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $8.00 in rewards to spend later

install icon

Free or discounted install kits when available.

Fits select models only.
Add details to confirm fitment.
1
List price $139.95
-43% $79.99 /pair

In stock.

Limited time!

Infinity REF507F (INFSPKRF507FUS)

270W Peak (90W RMS) 5.25" Reference Series 2-Way Coaxial 3-ohm Speakers

REF507F big
Go to item page Right Arrow Icon of Right Arrow

270W Peak (90W RMS) 5.25" Reference Series 2-Way Coaxial 3-ohm Speakers

• 135 watts Peak Each, 45 watts RMS Each
• Textile Edge Driven Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 92 dB

Free Speaker Accessory at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $11.00 in rewards to spend later

install icon

Save up to $13 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
1
List price $139.95
-21% $109.95 /pair

In stock

Limited time!

Infinity Primus 503F (INFSPKPR503F)

240W Peak (80W RMS) 5.25” Primus Series 2 Way Coaxial 3-ohm Speakers

Primus 503F big
Go to item page Right Arrow Icon of Right Arrow

240W Peak (80W RMS) 5.25” Primus Series 2 Way Coaxial 3-ohm Speakers

• 120 watts Peak Each, 40 watts RMS Each
• 1/2" Silk Edge Driven Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 91 dB

Free Speaker Accessory at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
install icon

Save up to $13 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
List price $99.95
-30% $69.95 /pair

In stock

Only 3 Left!

Infinity REF-5030cx (REF5030CXAM)

390W Peak (130W RMS) 5.25” Reference Series 3 ohm Component Speaker System

REF5030CXAM big
Go to item page Right Arrow Icon of Right Arrow

390W Peak (130W RMS) 5.25” Reference Series 3 ohm Component Speaker System

• 195 watts Peak Each, 65 watts RMS Each
• 3/4" Textile Edge Driven Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

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

Save up to $13 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
1
List price $249.95
-56% $109.95 /set

In stock

Limited time!

Infinity Kappa 53XF (INFSPKKA53XFAM)

360W Peak (120W RMS) 5.25" Kappa Series 2-Way Coaxial 3-ohm Car Speakers

Kappa 53XF big
Go to item page Right Arrow Icon of Right Arrow

360W Peak (120W RMS) 5.25" Kappa Series 2-Way Coaxial 3-ohm Car Speakers

• 180 watts Peak Each, 60 watts RMS Each
• Silk Edge Driven Dome tweeters
• Glass Fiber cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

Free Speaker Accessory at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $16.00 in rewards to spend later

install icon

Save up to $13 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
List price $249.95
Save $90.00
-36% $159.95 /pair

In stock

Limited time!

Infinity REF-6532ex (REF6532EXAM)

330W Peak (110W RMS) 6.5" Reference Series 2 Way Coaxial 3-ohm Speakers

Go to item page Right Arrow Icon of Right Arrow

330W Peak (110W RMS) 6.5" Reference Series 2 Way Coaxial 3-ohm Speakers

• 165 watts Peak Each, 55 watts RMS Each
• 1" Textile Edge Driven Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

Free Speaker Accessory at Checkout!
install icon

Save up to $23 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
6
List price $130.00
-38% $79.99 /pair

• 165 watts Peak Each, 55 watts RMS Each
• 1" Textile Edge Driven Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

Limited time!

Infinity Primus 603CF (PR603CF)

360W Peak (120W RMS) 6.5" Primus Series 2 Way 3-ohm Component Speaker System

PR603CF big
Go to item page Right Arrow Icon of Right Arrow

360W Peak (120W RMS) 6.5" Primus Series 2 Way 3-ohm Component Speaker System

• 180 watts Peak Each, 60 watts RMS Each
• 3/4" Silk Edge Driven Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 92 dB

Free Speaker Accessory at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $13.00 in rewards to spend later

install icon

Save up to $19 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
1
List price $159.95
-19% $129.95 /set

In stock

Limited time!

Infinity REF607CF (INFSPKRF607CFUS)

540W Peak (180W RMS) 6.5" Reference Series 2 Way 3-ohm Component Speaker System

REF607CF big
Go to item page Right Arrow Icon of Right Arrow

540W Peak (180W RMS) 6.5" Reference Series 2 Way 3-ohm Component Speaker System

• 270 watts Peak Each, 90 watts RMS Each
• 3/4" Textile Edge Driven Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

Free Baffles with Select Speakers Shop deal
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $22.00 in rewards to spend later

install icon

Save up to $24 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
3
List price $249.95
-12% $219.95 /set

In stock.

Used from: $186.96
Limited time!

Infinity Reference 5032cfx (REF-5032CFXAM)

270W Peak (90W RMS) 5.25" Reference Series 2 Way Coaxial 3-ohm Speakers

REF-5032CFXAM big
Go to item page Right Arrow Icon of Right Arrow

270W Peak (90W RMS) 5.25" Reference Series 2 Way Coaxial 3-ohm Speakers

• 135 watts Peak Each, 45 watts RMS Each
• Textile Edge Driven Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 92 dB

Free Speaker Accessory at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
install icon

Save up to $7 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
List price $130.00
-42% $74.99 /pair

In stock

Infinity Primus 603F (INFSPKPR603C)

300W Peak (100W RMS) 6.5” Primus Series 2 Way Coaxial 3-ohm Speakers

PR603F big
Go to item page Right Arrow Icon of Right Arrow

300W Peak (100W RMS) 6.5” Primus Series 2 Way Coaxial 3-ohm Speakers

• 150 watts Peak Each, 50 watts RMS Each
• 1/2" Silk Edge Driven Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 92 dB

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

VIP Product Get $8.00 in rewards to spend later

install icon

Save up to $23 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
7
List price $109.95
-27% $79.95

In stock

Infinity Primus PR5012IS (PR5012ISAM)

240W Peak (80W RMS) 5.25" Primus Series 2 Way Coaxial 2.7-ohm Speakers

PR5012ISAM big
Go to item page Right Arrow Icon of Right Arrow

240W Peak (80W RMS) 5.25" Primus Series 2 Way Coaxial 2.7-ohm Speakers

• 120 watts Peak Each, 40 watts RMS Each
• Textile Edge Driven Dome tweeters
• Polypropylene cone material
• Impedance: 2.7 ohm
• Sensitivity: 88 dB

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

Install kits available for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
List price $119.95
-54% $54.95 /pair

In stock

Limited time!

Infinity REF407F (INFSPKRF407FUS)

210W Peak (75W RMS) 4" Reference Series 2-Way Coaxial 3-ohm Speakers

REF407F big
Go to item page Right Arrow Icon of Right Arrow

210W Peak (75W RMS) 4" Reference Series 2-Way Coaxial 3-ohm Speakers

• 105 watts Peak Each, 35 watts RMS Each
• 1/2" Textile Edge Driven Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 92 dB

Free Speaker Accessory at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $11.00 in rewards to spend later

install icon

Free or discounted install kits when available.

Fits select models only.
Add details to confirm fitment.
List price $139.95
-21% $109.95 /pair

In stock

Infinity Kappa 503CF (INFSPKKA503CFAM) (Open Box, Great)

480W Peak (160W RMS) 5.25” Kappa Series 2 Way 3-ohm Component Speaker System

Kappa 503CF big
Go to item page Right Arrow Icon of Right Arrow

480W Peak (160W RMS) 5.25” Kappa Series 2 Way 3-ohm Component Speaker System

• 240 watts Peak Each, 80 watts RMS Each
• 3/4" Silk Edge Driven Dome uni-pivot and angled tweeters
• Glass Fiber cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

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

Save up to $13 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
List price $449.95
-38% $279.30 /set

In stock

Only 1 Left!

Infinity Reference 5030cx (REF5030CX) (Open Box, Great)

390W Max (130W RMS) 5.25" Reference Series 2 Way 3-ohm Component Speaker System

Reference 5030cx big
Go to item page Right Arrow Icon of Right Arrow

390W Max (130W RMS) 5.25" Reference Series 2 Way 3-ohm Component Speaker System

• 195 watts Peak Each, 65 watts RMS Each
• 3/4" Textile Edge Driven Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

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

Save up to $13 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
List price $249.95
-44% $139.99 /set

In stock

Only 1 Left!

Infinity REF607CF (INFSPKRF607CFUS) (Open Box, Great)

540W Peak (180W RMS) 6.5" Reference Series 2 Way 3-ohm Component Speaker System

REF607CF big
Go to item page Right Arrow Icon of Right Arrow

540W Peak (180W RMS) 6.5" Reference Series 2 Way 3-ohm Component Speaker System

• 270 watts Peak Each, 90 watts RMS Each
• 3/4" Textile Edge Driven Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

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

Save up to $24 on install kits for this speaker

additional information required
Fits select locations in your A4.
Add vehicle details to confirm exact location.
3
List price $249.95
-25% $186.96 /set

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

    2018 Ford Escape

    1998 Audi A4

    2017 Subaru Outback

    1983 Mercury LN7

    2007 BMW M5

    1981 Cadillac DeVille

    2003 Dodge Sprinter 2500

    1985 Mazda GLC

    2012 Audi R8

    2018 Ford Explorer

    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.