Garage
Shop

2000 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 2000 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
You Recently Chose:

We are sorry, no available results!

filter-icon Filters & Sort
Limited time!

Rockford Fosgate Punch P2 P2D2-8

500W Peak (250W RMS) 8" Punch Series Dual 2-ohm Car Subwoofer

P2D2-8 big
Go to item page Right Arrow Icon of Right Arrow

500W Peak (250W RMS) 8" Punch Series Dual 2-ohm Car Subwoofer

• Peak Power: 500 watts
• RMS Power: 250 watts
• Impedance: Dual 2 ohm
• Kevlar Reinforced Pulp Paper Cone
• Rubber Surround
• Mount depth: 4.76"
• Sensitivity: 83 dB

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

VIP Product Get $13.50 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

20
List price $149.99
Save $15.00
-10% $134.99

In stock

Used from: $114.74

Rockford Fosgate Power T750X1bd

750W RMS Class BD Power Series Monoblock Car Amplifier

T750X1bd big
Go to item page Right Arrow Icon of Right Arrow

750W RMS Class BD Power Series Monoblock Car Amplifier

• 500 watts x 1 channel @ 4 ohm
• 750 watts x 1 channel @ 2 ohm
• 750 watts x 1 channel @ 1 ohm
• Total RMS Power: 750 watts
• Class BD 1 ohm Stable Monoblock Amplifier

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

VIP Product Get $55.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

6
$549.99

In stock

Used from: $467.49

Rockford Fosgate Punch P3 P300-10

600W Peak (300W RMS) Class-D Amplified Single 10" Punch Series Subwoofer Enclosure with Remote Bass Level Control Included

P300-10 big
Go to item page Right Arrow Icon of Right Arrow

600W Peak (300W RMS) Class-D Amplified Single 10" Punch Series Subwoofer Enclosure with Remote Bass Level Control Included

• 10" Subwoofer 300 Watts RMS
• Rockford Fosgate Sealed Enclosure
• 300 Watt Class-D Mono Block
• Bass Remote Included
• Low And High level Inputs

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

VIP Product Get $34.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

58
$339.99

In stock

Rockford Fosgate Power T500-1bdCP

500W RMS Class BD Power Series Monoblock Car Amplifier

T500-1bdCP big
Go to item page Right Arrow Icon of Right Arrow

500W RMS Class BD Power Series Monoblock Car Amplifier

• 300 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 500 watts
• Class BD 1 ohm Stable Monoblock Amplifier

2+ offers available
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $55.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

16
$549.99

In stock

Only 2 Left!

Continue to cart

Available Offers (2) for Rockford Fosgate Power T500-1bdCP
FREE NVX Amp Kit at Checkout!
Save 30% on an NVX XKIT42 Amp Kit with Purchase! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT42 Amp Kit! No code needed — discount applies automatically at checkout.
Used from: $467.49

Rockford Fosgate RFIF2SW Speaker to RCA Adapter

High Level Speaker Line Wire Input To Female RCA Output Adapter

RFIF2SW big
Go to item page Right Arrow Icon of Right Arrow

High Level Speaker Line Wire Input To Female RCA Output Adapter

• Speaker Line High Level Input To Female RCA Output Adapter
• Converts Factory (OEM) High Level Speaker Outputs into RCA Outputs for Use with an Aftermarket Amp

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

15
$14.99

In stock

• Speaker Line High Level Input To Female RCA Output Adapter
• Converts Factory (OEM) High Level Speaker Outputs into RCA Outputs for Use with an Aftermarket Amp

Limited time!

Rockford Fosgate RFK8I

8 Gauge Amplifier Power & Signal Installation Kit

RFK8i big
Go to item page Right Arrow Icon of Right Arrow

8 Gauge Amplifier Power & Signal Installation Kit

• 8 Gauge Amplifier Installation Kit
• Includes RCA Interconnect Cables
• Made from 100% Pure Crystal-Oxygen Free Copper
• Includes Wire Termination Hardware
• CEA-2015 Compliant

15% off an NVX XCAP1F w/ Select Amp Kits
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $14.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

14
$139.99

In stock


Available Deal
RFK8i main
Offer may end without notice

Eligible items

Shop items below for 15% off up to $100 discount on Get 15% off an NVX XCAP1F

NVX XCAP1F

$109.99

$93.49

$16.50 Savings!

Add to cart

Rockford Fosgate Power T2 T2S2-16 (Open Box, Great)

5000W Peak (2500W RMS) 16" Power Series Single 2-ohm Car Subwoofer

T2S2-16 big
Go to item page Right Arrow Icon of Right Arrow

5000W Peak (2500W RMS) 16" Power Series Single 2-ohm Car Subwoofer

• Peak Power: 5000 watts
• RMS Power: 2500 watts
• Impedance: Single 2 ohm
• Glass Fiber Cone
• Injection molded foam Surround
• Mount depth: 10.47"
• Sensitivity: 90 dB

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $1299.99
-30% $909.99

In stock

Only 3 Left!

• Peak Power: 5000 watts
• RMS Power: 2500 watts
• Impedance: Single 2 ohm
• Glass Fiber Cone
• Injection molded foam Surround
• Mount depth: 10.47"
• Sensitivity: 90 dB

Rockford Fosgate RGB-YC

Color Optix Y adapter cable to be used with PMX-RGB

RGB-YC big
Go to item page Right Arrow Icon of Right Arrow

Color Optix Y adapter cable to be used with PMX-RGB

• IPX7 rated Deutsch™ / Amphenol™ Element Ready™ connectors
• Controller illuminates up to 8 Color Optix™ speakers and/or subwoofers

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

$16.99

Available

Ships in 10-14 days

• IPX7 rated Deutsch™ / Amphenol™ Element Ready™ connectors
• Controller illuminates up to 8 Color Optix™ speakers and/or subwoofers

Rockford Fosgate Power T2 T2S2-16

5000W Peak (2500W RMS) 16" Power Series Single 2-ohm Car Subwoofer

T2S2-16 big
Go to item page Right Arrow Icon of Right Arrow

5000W Peak (2500W RMS) 16" Power Series Single 2-ohm Car Subwoofer

• Peak Power: 5000 watts
• RMS Power: 2500 watts
• Impedance: Single 2 ohm
• Glass Fiber Cone
• Injection molded foam Surround
• Mount depth: 10.47"
• Sensitivity: 90 dB

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

VIP Product Get $130.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

$1,299.99

In stock

Only 3 Left!

Used from: $1,104.99

Rockford Fosgate R500X1D 500 Watt Car Amplifier + Amp Wiring Kit Bundle

R500X1D 500W RMS Prime Series Class D Monoblock Amplifier + BAK42 Complete CCA 4 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects

BAK42BK,R500X1D big
Go to item page Right Arrow Icon of Right Arrow

R500X1D 500W RMS Prime Series Class D Monoblock Amplifier + BAK42 Complete CCA 4 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects

• R500X1D 500W RMS Prime Series Class D Monoblock Amplifier
• BAK42 Complete 4 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects (CCA Wiring)

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

76
List price $369.98
-7% $344.98

In stock

• R500X1D 500W RMS Prime Series Class D Monoblock Amplifier
• BAK42 Complete 4 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects (CCA Wiring)

Rockford Fosgate Power T1 T1D210

11200W Peak (600W RMS) 10" Power Series Dual 2-ohm Car Subwoofer

T1D210 big
Go to item page Right Arrow Icon of Right Arrow

11200W Peak (600W RMS) 10" Power Series Dual 2-ohm Car Subwoofer

• Peak Power: 1200 watts
• RMS Power: 600 watts
• Impedance: Dual 2 ohm
• Kevlar Reinforced Semi-Pressed Paper Cone
• Rubber Surround
• Mount depth: 6.375"
• Sensitivity: 83 dB

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

8
$479.99

In stock

Used from: $383.99

Rockford Fosgate Punch GS-525

Surface Mount Mesh Grilles for Rockford Fosgate 5.25" Punch V2 Speakers

GS-525 big
Go to item page Right Arrow Icon of Right Arrow

Surface Mount Mesh Grilles for Rockford Fosgate 5.25" Punch V2 Speakers

• 5" Punch V2 Surface Mount Speaker Mesh Grilles
• Designed for use in select Rockford Fosgate Punch V2 speakers
• Surface mount design installs directly onto mounting surface
• Ideal for applications that disregard grille height

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

$59.99

Available

Ships in 10-14 days

• 5" Punch V2 Surface Mount Speaker Mesh Grilles
• Designed for use in select Rockford Fosgate Punch V2 speakers
• Surface mount design installs directly onto mounting surface
• Ideal for applications that disregard grille height

Rockford Fosgate Punch PS-8

300W 8" Punch Powered Under-Seat Loaded Subwoofer Enclosure with High & Low Level Input for OEM or Aftermarket Integration

PS-8 big
Go to item page Right Arrow Icon of Right Arrow

300W 8" Punch Powered Under-Seat Loaded Subwoofer Enclosure with High & Low Level Input for OEM or Aftermarket Integration

• Remote bass level control included
• Supports Hi-level (Speaker) / low-level (RCA) inputs
• Includes all power, ground, and turn-on wires
• Includes mounting hardware
• "Closed-loop" design ensures optimum performance between woofer, amplifier and enclosure

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

VIP Product Get $39.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

11
$389.99

In stock

Only 2 Left!

• Remote bass level control included
• Supports Hi-level (Speaker) / low-level (RCA) inputs
• Includes all power, ground, and turn-on wires
• Includes mounting hardware
• "Closed-loop" design ensures optimum performance between woofer, amplifier and enclosure

2) Rockford Fosgate R2 R2SD4-10

800W Peak (400W RMS) 10" Prime R2 Series Shallow-mount Dual 4-ohm Subwoofer (Pair)

R2SD4-10 2 Pack big
Go to item page Right Arrow Icon of Right Arrow

800W Peak (400W RMS) 10" Prime R2 Series Shallow-mount Dual 4-ohm Subwoofer (Pair)

• Peak Power: 400 watts
• RMS Power: 200 watts
• Impedance: Dual 4 ohm
• Mica Injected Polypropylene - MIPP Cone
• Foam Surround
• Mount depth: 3.417"
• Sensitivity: 82 dB

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

37
$319.98

In stock

Only 1 Left!

• Peak Power: 400 watts
• RMS Power: 200 watts
• Impedance: Dual 4 ohm
• Mica Injected Polypropylene - MIPP Cone
• Foam Surround
• Mount depth: 3.417"
• Sensitivity: 82 dB

Rockford Fosgate Prime R2 R2-300X4

300W RMS Class D Prime Series 4 Channel Car Amplifier

R2-300X4 big
Go to item page Right Arrow Icon of Right Arrow

300W RMS Class D Prime Series 4 Channel Car Amplifier

• 50 watts x 4 channel @ 4 ohm
• 75 watts x 4 channel @ 2 ohm
• Bridged: 150 watts x 2 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 2 ohm Stable 4-Channel Amplifier

2+ offers available
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $31.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

5
$309.99

In stock

Continue to cart

Available Offers (2) for Rockford Fosgate Prime R2 R2-300X4
FREE Belva Amp Kit at Checkout!
Save 30% off an NVX XKIT44 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT44 Amp Kit! No code needed — discount applies automatically at checkout.
Used from: $263.49
Lowest price in 30 days

2) Rockford Fosgate P3D2-15

2400W Peak (1200W RMS) 15" Punch P3 Series Dual 2-ohm Subwoofer (Pair)

P3D2-15 2 Pack big
Go to item page Right Arrow Icon of Right Arrow

2400W Peak (1200W RMS) 15" Punch P3 Series Dual 2-ohm Subwoofer (Pair)

• Peak Power: 1200 watts
• RMS Power: 600 watts
• Impedance: Dual 2 ohm
• Anodized Aluminum Cone
• Santoprene Rubber Surround
• Mount depth: 7.58"
• Sensitivity: 86 dB

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

17
List price $679.98
-9% $619.98

In stock

Only 2 Left!

• Peak Power: 1200 watts
• RMS Power: 600 watts
• Impedance: Dual 2 ohm
• Anodized Aluminum Cone
• Santoprene Rubber Surround
• Mount depth: 7.58"
• Sensitivity: 86 dB

Limited time!

Rockford Fosgate RFK1D

Complete Dual Amp 1/0 Gauge PC-OFC Amplifier Wiring Kit

RFK1D big
Go to item page Right Arrow Icon of Right Arrow

Complete Dual Amp 1/0 Gauge PC-OFC Amplifier Wiring Kit

• 100% Pure Crystal-Oxygen Free Copper
• Designed specifically for 2400 watts+ car audio systems
• Includes appropriate wire termination hardware
• meets or exceeds AWG (American Wire Gauge) requirements

15% off an NVX XCAP10H w/ Select Amp Kits
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $56.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

10
$559.99

In stock


Available Deal
RFK1D main
Offer may end without notice

Eligible items

Shop items below for 15% off up to $100 discount on Get 15% off an NVX XCAP10H


Used from: $475.99

Rockford Fosgate Prime R2 R2D4-12

500W Peak (250W RMS) 12" Prime Series 2 Dual 4-ohm Car Subwoofer

R2D4-12 big
Go to item page Right Arrow Icon of Right Arrow

500W Peak (250W RMS) 12" Prime Series 2 Dual 4-ohm Car Subwoofer

• Peak Power: 500 watts
• RMS Power: 250 watts
• Impedance: Dual 4 ohm
• Mica Injected Polypropylene - MIPP Cone
• Poly-Foam Surround
• Mount depth: 5.067"
• Sensitivity: 89 dB

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

15
$119.99

In stock

Only 2 Left!

Rockford Fosgate PLC-U

Universal Wired Bass Remote Controller

PLC-U big
Go to item page Right Arrow Icon of Right Arrow

Universal Wired Bass Remote Controller

• Universal Wired Bass Remote
• Flush, under dash, rocker switch mount options
• Provides In-line signal level control
• Female RCA signal input and signal output

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

5
$79.99

In stock

Only 3 Left!

• Universal Wired Bass Remote
• Flush, under dash, rocker switch mount options
• Provides In-line signal level control
• Female RCA signal input and signal output

Limited time!

Rockford Fosgate Punch P2 P2D4-10

600W Peak (300W RMS) 10" Punch Series Dual 4-ohm Car Subwoofer

P2D4-10 big
Go to item page Right Arrow Icon of Right Arrow

600W Peak (300W RMS) 10" Punch Series Dual 4-ohm Car Subwoofer

• Peak Power: 600 watts
• RMS Power: 300 watts
• Impedance: Dual 4 ohm
• Kevlar Reinforced Pulp Paper Cone
• Rubber Surround
• Mount depth: 5.92"
• Sensitivity: 84 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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

27
List price $179.99
Save $20.00
-11% $159.99

In stock

Only 1 Left!

Used from: $135.99

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 2000 A4

    Q: Can I upgrade or change the Universal-Fit Audio & Electronics in 2000 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

    2019 Volkswagen e-Golf

    2009 Audi Q5

    2000 Audi A4

    2002 Lexus IS300

    2014 Chevrolet Spark

    1996 Mazda 626

    1986 Pontiac 6000

    2018 Mercedes-Benz GLC-Class

    2013 BMW M5

    2017 Lincoln MKC

    Vehicle
    Store
    Delete

    1983 Honda GL650 Silver Wing

    1994 Honda VFR750F Interceptor

    2000 Harley Davidson FXSTB/I Night Train

    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.