Garage
Shop
Account Icon
Account
Box Icon
Track
order
Telephone Icon
Call
Help Icon
Help
Door with Arrow Icon
Sign In

2003 Audi A4 Quattro

Change vehicle | Remove vehicle

Overview Upgrade your Speakers Add a Subwoofer Add an Amplifier Digital Sound Processors Audio Installation & Accessories Add a Backup Camera Dads & Grads Sale

Speakers & Speaker Installation for 2003 Audi A4 Quattro

Find speakers to upgrade your sound and fit in the factory speaker location for your A4 Quattro.  After you choose your speakers, we'll help you find speaker adapters, speaker harnesses and other accessories for installation.

All car speakers

Shop All Speaker Locations in the Vehicle

See all speakers that fit, regardless of location.

Center Dash Speaker(s)

Center Dash Speakers

Speakers for your center dash

Front Door Panel Speakers

Front Door Speakers

Speakers for your front door panels

Rear Deck Corner

Rear Deck Corner Speakers

Speakers for your corner rear deck

Rear Door Panel Speakers

Rear Door Panel Speakers

Speakers for your rear door panels

Rear Seat Side Panel Speakers

Rear Seat Side Panel Speakers

Speakers for your rear seat side panel.

Dads & Grads Sale

Dads & Grads Sale

Free Gear / Open-Box Deals / Huge Discounts up to 40% off Car / Marine / ATV Audio

Filters
Infinity ✕
Clear Filters
Reset Done
Product Type
Price Range
Speaker Location
Speaker Size
Refers to the size of the speaker measured in inches. Every vehicle has standard application sizes. Please use our vehicle fitment guide for your vehicle's specific speaker sizes if you do not know them.
Design
The number of individual drivers in a car speaker. Speakers with 2 drivers are known as a 2-way, and 3 drivers are known as a 3-way. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer and the tweeter. Center channel speakers are great for those looking to have surround sound in their vehicle.
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
  Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.
Tweeter Design
Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
Series
Many brands group their products into series or lines of products to help customers know the level of quality (good, better, best for example). You can filter by series and the brand using our guided browsing.
Deals
Promotions we have offer More Ways to Shop for items that are on clearance, last chance, special offer and sales, Made in America, and more!
filter-icon Filters & Sort
Limited time!

Infinity Kappa 303S (INFSPKKA303SAM)

330W Peak (110W RMS) 3” Kappa Series Component Midrange 3-ohm Speakers

Kappa 303S big
Go to item page Right Arrow Icon of Right Arrow

Infinity Kappa 303S (INFSPKKA303SAM)

330W Peak (110W RMS) 3” Kappa Series Component Midrange 3-ohm Speakers

• 165 watts Peak Each, 55 watts RMS Each
• Glass Fiber cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

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

Install kits available for most vehicles

found car based on your search
Fits the following location in your A4 Quattro
  • Center Dash
2
List price $249.95
Save $90.00
-36% $159.95 /pair

In stock

Add to Cart
See all 5 special offers
Lowest price in 30 days

Infinity Kappa 303S with Sound Damping

330W Peak (110W RMS) 3” Kappa Series 2-way Coaxial Car Speakers + NVX SDSK2 Sound Damping

KAPPA303S_SDSK2 big
Go to item page Right Arrow Icon of Right Arrow

Infinity Kappa 303S with Sound Damping

330W Peak (110W RMS) 3” Kappa Series 2-way Coaxial Car Speakers + NVX SDSK2 Sound Damping

• 165 watts Peak Each, 55 watts RMS Each
• 3" Silk Dome Tweeters
• cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4 Quattro
49
List price $268.69
-35% $174.94

In stock

Add to Cart

• 165 watts Peak Each, 55 watts RMS Each
• 3" Silk Dome Tweeters
• cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

Lowest price in 30 days

Infinity Kappa 303S (2-Pairs, 4-Total)

660W Peak (220W RMS) 3” Kappa Series 2-way Component Car Speakers (2-Pairs)

KAPPA303S_2 big
Go to item page Right Arrow Icon of Right Arrow

Infinity Kappa 303S (2-Pairs, 4-Total)

660W Peak (220W RMS) 3” Kappa Series 2-way Component Car Speakers (2-Pairs)

• 165 watts Peak Each, 55 watts RMS Each
• 3" Silk Dome Tweeters
• cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your A4 Quattro
2
List price $499.90
-36% $319.90

In stock

Only 2 Left!

Add to Cart

• 165 watts Peak Each, 55 watts RMS Each
• 3" Silk Dome Tweeters
• cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

Infinity Kappa 303S with Speaker Installation Kit

Includes: 3" Mid-Range Speaker, Sound Damping Kit, Installer Panel Removal Tool Kit, Rubber Roller

INFSPKKA303SAM, SDSK2, SDRLR1, BTK106 big
Go to item page Right Arrow Icon of Right Arrow

Infinity Kappa 303S with Speaker Installation Kit

Includes: 3" Mid-Range Speaker, Sound Damping Kit, Installer Panel Removal Tool Kit, Rubber Roller

• 165 watts Peak Each, 55 watts RMS Each
• 3" Silk Dome Tweeters
• cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

Save 15% Off Package Deals at Checkout!
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 the following location in your A4 Quattro
  • Center Dash
141
List price $302.67
-38% $188.09 /pair

In stock

Add to Cart

• 165 watts Peak Each, 55 watts RMS Each
• 3" Silk Dome Tweeters
• cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

 
    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 Speakers in 2003 A4 Quattro

    Q: Can I upgrade or change the Speakers in 2003 Audi A4 Quattro?

    A: Yes this page includes all the best Speakers that work in your A4 Quattro.

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

    2003 Audi A4 Quattro

    2009 Kia Rio

    2004 Ford Excursion

    1976 Buick Century

    2019 Buick Envision

    2016 Kia Forte5

    2012 Audi TT Quattro

    2010 Nissan Altima

    2007 Audi RS4

    1981 Chrysler Newport

    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

    Cancel

    This category was not designed for products.
    If you continue, you will be redirected to a category customized for your vehicle. Continue

    Cancel

    Shop your 2003 A4 Quattro
    Why Use a Vehicle Fit Guide?
    Change vehicle | Shop without vehicle
    Whoa! Slow down. Add your details below!
    additional information required
    Add vehicle details to confirm fitment
    Ignore fitment details
    Find stereos and more that work -- fast.

    Additional information:

    Remove

    Can't find your vehicle? Click here and we'll help.

    Where to find vehicle info

    Go to Fitment

    Didn't find your car?

    Submit your details and we'll help!
    Please enter the letters as they are shown in the image above. Letters are not case-sensitive.
    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
    Back

    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.

    Back
    Track your order
    Call our experts
    Support Center
    Return & Exchanges
    Follow on Instagram Instagram logo
    Subscribe on YouTube YouTube logo