Garage
Shop

Loading...
40-VW10 main

Metra 40-VW10 Antenna Adapter

Connect your factory antenna to a new aftermarket radio for select 1973-2025 vehicles from Audi, Mercedes-Benz, Volkswagen

22
-33.36%

$7.99

List price $11.99

70-1784 main

Metra 70-1784

Install a New Car Stereo in select 1980-2020 vehicles from Volkswagen, Audi, Ram

16
99-9107B main

Metra 99-9107B Dash Kit

Install a new Single-DIN or Double-DIN car stereo in select 2002-2009 S4 and A4 and RS4 (Matte Black)

8
-58.83%

$27.99

List price $67.99

Limited time!
DMX709S main

Kenwood eXcelon DMX709S

6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto (Sirius XM Ready)

39
-33.50%

$399.00

List price $600.00

JVC KW-R950BTS

Double DIN CD Receiver with Bluetooth and Built-in Alexa (Sirius XM Ready)

6
-10.58%

$169.00

List price $189.00

Shop all 2003 Audi A4 Car Audio, Speakers, & Electronics

Loading...
Filters
filter-icon Filters & Sort
Limited time!

JL Audio C2-600

120W RMS 6" C2 Series 2-Way 4-ohm Component Speaker System

C2-600 big
Go to item page Right Arrow Icon of Right Arrow

120W RMS 6" C2 Series 2-Way 4-ohm Component Speaker System

• RMS Each
• 3/4" Silk Dome tweeters
• Mica Injected Polypropylene - MIPP cone material
• Impedance: 4 ohm
• Sensitivity: 90.5 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 $25.50 in rewards to spend later

install icon

Save $22 on install kits for this speaker

found car based on your search
Fits multiple locations in your A4
5
List price $329.99
Save $75.00
-23% $254.99 /set

In stock

Used from: $216.74
Limited time!

Dual DCPA723W

7” Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay, and Android Auto

DCPA723W big
Go to item page Right Arrow Icon of Right Arrow

7” Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay, and Android Auto

• Double DIN Bluetooth Digital Multimedia Receiver
• 7" Capacitive Touchscreen Display
• Wireless Apple CarPlay and Android Auto Compatible
• Slim Mount (3.5") chassis depth
• 3 sets of 4 volts preamp outputs
• 10 Band EQ, 7 EQ Presets
• 6 Preset color illumination

FREE Backup Camera at Checkout! 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

Free or discounted install kits when available.

Fits select models only.
Add details to confirm fitment.
5
List price $287.99
Save $68.00
-24% $219.99

In stock

Limited time!

JVC KW-V660BT

6.8" Double DIN CD/DVD Receiver with Bluetooth, Apple CarPlay, Android Auto (Sirius XM Ready)

KW-V660BT big
Go to item page Right Arrow Icon of Right Arrow

6.8" Double DIN CD/DVD Receiver with Bluetooth, Apple CarPlay, Android Auto (Sirius XM Ready)

• Double DIN Bluetooth CD/DVD Multimedia Receiver
• 6.8" Capacitive Touchscreen Display Display
• Apple CarPlay and Android Auto Compatible
• Screen mirroring features for iPhone and Android
• 3 sets of 2 volts preamp outputs
• 13-Band Graphic Equalizer with 7 Selectable Presets
• SiriusXM Satellite Radio Ready

FREE Backup Camera at Checkout! Shop deal
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $39.90 in rewards to spend later

install icon

Free or discounted install kits when available.

Fits select models only.
Add details to confirm fitment.
10
List price $479.00
Save $80.00
-17% $399.00

In stock

Only 3 Left!

Limited time!

Dual DCPA723W-M

7" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay and Android Auto (SiriusXM-Ready)

DCPA723W-M big
Go to item page Right Arrow Icon of Right Arrow

7" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay and Android Auto (SiriusXM-Ready)

• Double DIN In-Dash Bluetooth Digital Multimedia Receiver
• 7" Capacitive Touchscreen Display
• Wireless Apple CarPlay and Android Auto Compatible
• 3 sets of preamp outputs
• 10 Band Equalizer with 7 Presets
• SiriusXM Satellite Radio Ready
• iDataLink Maestro-compatible

FREE Backup Camera at Checkout! Shop deal
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $25.00 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 $279.99
Save $30.00
-11% $249.99

In stock

2 Pairs Kicker 6.5" Speakers (DSC650) + NVX VADM4 v2 w/ Free Amp Install Kit

Kicker 480W Peak 6.5” DS Coaxial Speakers with NVX 500W RMS 4-Channel Amplifier, 8 Gauge OFC Wiring Kit, and Foam Can Insulator Koozie

2X43DSC_VADM4_XK84_SK big
Go to item page Right Arrow Icon of Right Arrow

Kicker 480W Peak 6.5” DS Coaxial Speakers with NVX 500W RMS 4-Channel Amplifier, 8 Gauge OFC Wiring Kit, and Foam Can Insulator Koozie

  • Kicker DSC650 480W Peak 6.5-Inch DS Series 2-Way 4-Ohm Coaxial Car Speakers
  • NVX VADM4 v2 500W RMS V-Series Micro Full-Range Class D 4-Channel Amplifier
  • Full Spec 8 Gauge 100% OFC Complete 4-Channel Amplifier Wiring Kit with RCA
  • Sonic Electronix Premium Polyurethane Foam Can Insulator Sleeve Koozie
  • Complete setup includes Coaxial Speakers, 4-Channel Amplifier, Wiring Kit, and Koozie
shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
109
List price $547.94
-31% $380.00

In stock

  • Kicker DSC650 480W Peak 6.5-Inch DS Series 2-Way 4-Ohm Coaxial Car Speakers
  • NVX VADM4 v2 500W RMS V-Series Micro Full-Range Class D 4-Channel Amplifier
  • Full Spec 8 Gauge 100% OFC Complete 4-Channel Amplifier Wiring Kit with RCA
  • Sonic Electronix Premium Polyurethane Foam Can Insulator Sleeve Koozie
  • Complete setup includes Coaxial Speakers, 4-Channel Amplifier, Wiring Kit, and Koozie

Race Sport Accessories H7TLED

H7 Terminator Series Fan-less Shallow-mount LED Conversion Headlight Kit with Pinpoint Projection Optical Aims

H7TLED big
Go to item page Right Arrow Icon of Right Arrow

H7 Terminator Series Fan-less Shallow-mount LED Conversion Headlight Kit with Pinpoint Projection Optical Aims

• H7 Fan-less LED Conversion Headlight Kit
• IP67 waterproof rating
• 2000 lux / 2250 lumens per bulb
• See 2-3 times further than stock lighting systems
• Low-mounting depth base design

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

VIP Product Get $8.90 in rewards to spend later

found car based on your search
Fits your A4
List price $109.00
-18% $89.00

Available

Ships in 10-14 days

• H7 Fan-less LED Conversion Headlight Kit
• IP67 waterproof rating
• 2000 lux / 2250 lumens per bulb
• See 2-3 times further than stock lighting systems
• Low-mounting depth base design

Deaf Bonce Apocalypse AP-M61SE

520W Peak (260W RMS) 6.5” Apocalypse Series Midrange 4-ohm Speakers

AP-M61SE big
Go to item page Right Arrow Icon of Right Arrow

520W Peak (260W RMS) 6.5” Apocalypse Series Midrange 4-ohm Speakers

• 260 watts Peak Each, 130 watts RMS Each
• Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 101.5 dB

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

Install kits available for this speaker

found car based on your search
Fits multiple locations in your A4
8
$109.90 /pair

In stock

Limited time!

Sony XAV-AX6000

6.95" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay and Android Auto (Sirius XM Ready)

XAV-AX6000 big
Go to item page Right Arrow Icon of Right Arrow

6.95" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay and Android Auto (Sirius XM Ready)

• Double DIN Bluetooth Digital Multimedia Receiver with USB and HDMI
• 6.95" TFT Active Matrix Display
• Wireless Apple CarPlay and Android Auto
• 3 sets of 5 volts preamp outputs
• 14-Band Equalizer
• SiriusXM Satellite Radio Ready
• iDatalink Maestro compatible

FREE Backup Camera at Checkout! Shop deal
shipping truck icon Free shipping in USA. Provide zip for delivery date.
install icon

Free or discounted install kits when available.

Fits select models only.
Add details to confirm fitment.
10
List price $699.99
Save $100.00
-14% $599.99

In stock

Kenwood DPX305MBT

Double DIN Digital Media Receiver with Bluetooth and Built-in Alexa (SiriusXM Ready)

DPX305MBT big
Go to item page Right Arrow Icon of Right Arrow

Double DIN Digital Media Receiver with Bluetooth and Built-in Alexa (SiriusXM Ready)

• Double DIN Bluetooth Digital Multimedia Receiver
• LCD Text Display
• Adjustable 3-zone illumination
• 3 sets of 2.5 volts preamp outputs
• 13-Band Graphic Equalizer with Digital Time Alignment
• SiriusXM Satellite Radio Ready
• Short chassis for flexible installation

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

Free or discounted install kits when available.

Fits select models only.
Add details to confirm fitment.
15
List price $200.00
-21% $159.00

In stock

Used from: $151.05

Pioneer DEH-S7200BHS

Single DIN CD Receiver with Bluetooth, HD Radio and SiriusXM Ready

DEH-S7200BHS big
Go to item page Right Arrow Icon of Right Arrow

Single DIN CD Receiver with Bluetooth, HD Radio and SiriusXM Ready

• Single DIN Bluetooth CD Digital Media Receiver
• LCD Text Display
• Voice Recognition
• Built-in HD Radio
• 3 sets of 4 volts preamp outputs
• 13-Band Equalizer
• SiriusXM Satellite Radio Ready
• Pioneer Smart Sync

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

Save $63.97 on install kits for this stereo

found car based on your search
Fits your A4
2
List price $280.00
-11% $249.99

In stock

Alpine S2-S10TW

480W Peak (160W RMS) 1" S-Series 4-ohm Dome Tweeters

S2S10TW big
Go to item page Right Arrow Icon of Right Arrow

480W Peak (160W RMS) 1" S-Series 4-ohm Dome Tweeters

• 1" S Series Tweeters
• 240 watts Peak Each
• 80 watts RMS Each
• 4 ohm Impedance

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

Install kits available for most vehicles

found car based on your search
Fits multiple locations in your A4
List price $130.00
-15% $109.95 /pair

In stock

• 1" S Series Tweeters
• 240 watts Peak Each
• 80 watts RMS Each
• 4 ohm Impedance

Kicker 51KST2504

450W Peak (150W RMS) 1" KS Series 4-ohm Car Tweeters

51KST2504 big
Go to item page Right Arrow Icon of Right Arrow

450W Peak (150W RMS) 1" KS Series 4-ohm Car Tweeters

• 1" KS Series Tweeters
• 225 watts Peak Each
• 75 watts RMS Each
• 4 ohm Impedance

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

Install kits available for most vehicles

found car based on your search
Fits multiple locations in your A4
1
List price $139.99
-14% $119.99 /pair

In stock

• 1" KS Series Tweeters
• 225 watts Peak Each
• 75 watts RMS Each
• 4 ohm Impedance

Jensen CMR2724

7" Double DIN Touch Screen Digital Multimedia Receiver with Bluetooth

CMR2724 big
Go to item page Right Arrow Icon of Right Arrow

7" Double DIN Touch Screen Digital Multimedia Receiver with Bluetooth

• Double DIN Bluetooth Digital Multimedia Receiver
• 7" TFT-LCD Display
• iPhone and Android compatible via Bluetooth
• 3 sets of preamp outputs
• 7 Band Graphic Equalizer
• Dual (front/rear view) camera input
• Bluetooth voice activation button for Siri/Google Assistant

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

Free or discounted install kits when available.

Fits select models only.
Add details to confirm fitment.
4
$109.99

In stock

Metra 70-1784

Install a New Car Stereo in select 1980-2020 vehicles from Volkswagen, Audi, Ram

70-1784 big
Go to item page Right Arrow Icon of Right Arrow

Install a New Car Stereo in select 1980-2020 vehicles from Volkswagen, Audi, Ram

• Direct Connection to the factory harness
• Color coded wires for easy installation
• No cutting or splicing required

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
16
$9.99

In stock

• Direct Connection to the factory harness
• Color coded wires for easy installation
• No cutting or splicing required

Limited time!

Cerwin-Vega H653

540W Peak (180W RMS) 6.5" HED Series 3 Way Coaxial 4-ohm Speakers

H653 big
Go to item page Right Arrow Icon of Right Arrow

540W Peak (180W RMS) 6.5" HED Series 3 Way Coaxial 4-ohm Speakers

• 270 watts Peak Each, 90 watts RMS Each
• 1" PEI (Polyetherimide) Balanced Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

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

Save $22 on install kits for this speaker

found car based on your search
Fits multiple locations in your A4
List price $131.99
-17% $109.99 /pair

In stock

Pioneer DEH-S4220BT

Single DIN CD Receiver with Bluetooth and Amazon Alexa

DEH-S4220BT big
Go to item page Right Arrow Icon of Right Arrow

Single DIN CD Receiver with Bluetooth and Amazon Alexa

• Single DIN Bluetooth CD Media Receiver
• Digital LED Backlit Display
• 2 sets of 4 volts preamp outputs
• 13-Band Equalizer
• Detachable face plate
• Built-in Alexa

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

Save $63.97 on install kits for this stereo

found car based on your search
Fits your A4
16
List price $170.00
-12% $149.99

In stock

Limited time!

JL Audio C1-650x

100W RMS 6.5" C1 Series 2 Way Coaxial 4-ohm Car Speakers

C1-650x big
Go to item page Right Arrow Icon of Right Arrow

100W RMS 6.5" C1 Series 2 Way Coaxial 4-ohm Car Speakers

• 50 watts RMS Each
• 3/4" Silk-Suspended Aluminum Dome tweeters
• Mineral-Filled Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90.5 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 $22 on install kits for this speaker

found car based on your search
Fits multiple locations in your A4
42
$129.99 /pair

In stock

Used from: $110.49

Metra 40-VW53 Antenna Adapter

Connect your factory antenna to a new aftermarket radio for select 1973-2025 vehicles from Audi, Mercedes-Benz, Volkswagen

40-VW53 big
Go to item page Right Arrow Icon of Right Arrow

Connect your factory antenna to a new aftermarket radio for select 1973-2025 vehicles from Audi, Mercedes-Benz, Volkswagen

• Aftermarket Radio To Factory Antenna Adapter (Amplified)
• Compatible with select 1973-2025 vehicles from Audi, Mercedes-Benz, Volkswagen Vehicles
• Includes Power Wire For Antenna Booster
• Can Be Used In Place Of 40-VW54

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4
3
List price $17.99
-28% $12.99

In stock

• Aftermarket Radio To Factory Antenna Adapter (Amplified)
• Compatible with select 1973-2025 vehicles from Audi, Mercedes-Benz, Volkswagen Vehicles
• Includes Power Wire For Antenna Booster
• Can Be Used In Place Of 40-VW54

Kenwood eXcelon KDC-X705

Single DIN CD Multimedia Receiver with Bluetooth and Built-in Alexa (Sirius XM Ready)

KDC-X705 big
Go to item page Right Arrow Icon of Right Arrow

Single DIN CD Multimedia Receiver with Bluetooth and Built-in Alexa (Sirius XM Ready)

• Single DIN Bluetooth Digital Multimedia Receiver with USB and AUX
• LCD Text Display
• iPhone and Android Compatible
• 3 sets of 5 volts preamp outputs
• 13-Band Graphic Equalizer with Digital Time Alignment
• SiriusXM Satellite Radio Ready

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

VIP Product Get $22.90 in rewards to spend later

install icon

Save $63.97 on install kits for this stereo

found car based on your search
Fits your A4
4
List price $280.00
-18% $229.00

In stock

Hertz C165

420W Peak (140W RMS) 6.5" Cento Series Midrange 4-ohm Speakers

C165 big
Go to item page Right Arrow Icon of Right Arrow

420W Peak (140W RMS) 6.5" Cento Series Midrange 4-ohm Speakers

• 210 watts Peak Each, 70 watts RMS Each
• Semi-Pressed paper with Mica cone material
• Impedance: 4 ohm
• Sensitivity: 93 dB

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 $22 on install kits for this speaker

found car based on your search
Fits multiple locations in your A4
4
List price $230.00
-13% $199.99 /pair

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

    2003 Audi A4

    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.