Garage
Shop

2009 Audi S4

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 2009 Audi S4

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

Single 12" Vented MDF Subwoofer Enclosure (Belva 1SV12B)

12-inch Vented Car Sub Box Made with 3/4" MDF and lined w/ Polyfil (1.8 cu ft airspace 1SV12B)

1SV12B big
Go to item page Right Arrow Icon of Right Arrow

12-inch Vented Car Sub Box Made with 3/4" MDF and lined w/ Polyfil (1.8 cu ft airspace 1SV12B)

• Single 12" Vented MDF Enclosure
• Holds one 12" subwoofer
• 3/4 MDF (Medium Density Fiberboard) Construction
• Durable black carpeting
• Gold Terminals
• Internal Box Volume: 1.8 cubic ft.

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

123
List price $95.99
-17% $79.99

In stock

Viper 5308V

2-Way Remote Start Keyless Entry System with 4-Button Transmitter

5308V big
Go to item page Right Arrow Icon of Right Arrow

2-Way Remote Start Keyless Entry System with 4-Button Transmitter

• 2-Way 5-Button Remote Car Starter
• With 4-Button Transmitter
• 1320 feet Range
• Antenna With Integrated Valet Switch & LED
• Built-in security features

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 $379.99
-16% $319.99

Available

Ships in 10-14 days

• 2-Way 5-Button Remote Car Starter
• With 4-Button Transmitter
• 1320 feet Range
• Antenna With Integrated Valet Switch & LED
• Built-in security features

Metra 82-6902

Universal 1/2" Spacer for 6x9" Speakers

82-6902 big
Go to item page Right Arrow Icon of Right Arrow

Universal 1/2" Spacer for 6x9" Speakers

• Universal 1/2" Speaker Spacers
• Fits 6" x 9" Speakers
• OEM Automotive Grade ABS Plastic Construction
• Color: Black

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

3
List price $29.99
-10% $26.99

In stock

• Universal 1/2" Speaker Spacers
• Fits 6" x 9" Speakers
• OEM Automotive Grade ABS Plastic Construction
• Color: Black

Belva BAK82

8 Gauge Premium (CCA) Copper Clad Aluminum Complete 2-Channel Amplifier Wiring Kit with RCA for Amplifiers up to 600 Watts - RED

BAK82 big
Go to item page Right Arrow Icon of Right Arrow

8 Gauge Premium (CCA) Copper Clad Aluminum Complete 2-Channel Amplifier Wiring Kit with RCA for Amplifiers up to 600 Watts - RED

• Complete 8 Gauge Amplifier Installation Kit
• For Amplifiers Up To 600 Watts RMS
• Premium (CCA) Copper Clad Aluminum
• Helical Twist 2-Channel RCA Cable
• ANL/Mini-ANL Fuse Holder with 60 amp fuse
• Complies to American Wire Gauge standards

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

97
List price $49.99
-50% $24.99

In stock

Used from: $27.99 Like New from: $33.99

Install Bay 89-00-9031 by Metra

12"x12"x1/8" ABS Plastic Sheet

89-00-9031 big
Go to item page Right Arrow Icon of Right Arrow

12"x12"x1/8" ABS Plastic Sheet

• 12" x 12" ABS Blank Panel Trim
• Customize The Blank Panel By Shaping It Or Cutting It Out
• Use It To Fill In Spaces And Gaps Or To Mount Accessories

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

19
List price $14.99
-33% $9.99

In stock

• 12" x 12" ABS Blank Panel Trim
• Customize The Blank Panel By Shaping It Or Cutting It Out
• Use It To Fill In Spaces And Gaps Or To Mount Accessories

NVX NDA12001

2400W Peak (1200W RMS) Class D N-Series Monoblock Car Amplifier with Bass Remote

NDA12001 big
Go to item page Right Arrow Icon of Right Arrow

2400W Peak (1200W RMS) Class D N-Series Monoblock Car Amplifier with Bass Remote

• 500 watts x 1 channel @ 4 ohm
• 850 watts x 1 channel @ 2 ohm
• 1200 watts x 1 channel @ 1 ohm
• Total RMS Power: 1200 watts
• Class D 1 ohm Stable Monoblock Amplifier

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

VIP Product Get $17.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

13
List price $239.99
-29% $169.99

In stock

JL Audio SGR-12TW3

Mesh Grille for JL Audio 12" TW3 Subwoofers

SGR-12TW3 big
Go to item page Right Arrow Icon of Right Arrow

Mesh Grille for JL Audio 12" TW3 Subwoofers

• 12" Subwoofer Grille
• Steel Mesh Material
• For Use with TW3 Series Subwoofers
• Powder Coated Satin Black Finish

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

6
$49.99

In stock

• 12" Subwoofer Grille
• Steel Mesh Material
• For Use with TW3 Series Subwoofers
• Powder Coated Satin Black Finish

Limited time!

NVX XQC302 Dual USB Quick Charge 3.0 Car Charger with LED Digital Voltmeter

QC 3.0 Fast Charging 12V/24V 36W Aluminum Waterproof Socket Power Output Adapter with On/Off Switch

XQC302 big
Go to item page Right Arrow Icon of Right Arrow

QC 3.0 Fast Charging 12V/24V 36W Aluminum Waterproof Socket Power Output Adapter with On/Off Switch

• Features Qualcomm Quick Charge 3.0
• Charges two devices simultaneously at 5V (2.1A)
• Charges devices 4x faster than conventional charging
• Compatible with most 12/24V charging systems
• Can be used nearly any application (Car/Truck/SUV/ATV/UTV/RV/Motorcycle/Marine)

Dads & Grads Sale! Save 15% 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

6
List price $29.99
-67% $9.99

In stock

• Features Qualcomm Quick Charge 3.0
• Charges two devices simultaneously at 5V (2.1A)
• Charges devices 4x faster than conventional charging
• Compatible with most 12/24V charging systems
• Can be used nearly any application (Car/Truck/SUV/ATV/UTV/RV/Motorcycle/Marine)

Stinger SGP90200

200 Amp Circuit Breaker

SGP90200 big
Go to item page Right Arrow Icon of Right Arrow

200 Amp Circuit Breaker

• 200 Amp Circuit Breaker
• Dust and splash proof
• Accepts 1/0 or 4 gauge wire
• Easy reset/disconnect
• Can act as a master disconnect for circuits

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

7
List price $139.00
-50% $68.99

In stock

Only 1 Left!

• 200 Amp Circuit Breaker
• Dust and splash proof
• Accepts 1/0 or 4 gauge wire
• Easy reset/disconnect
• Can act as a master disconnect for circuits

Directed 506T

Glass Break Audio Sensor

506T big
Go to item page Right Arrow Icon of Right Arrow

Glass Break Audio Sensor

• Audio Sensor That Detects Attempts to Tamper with or Break Your Vehicle's Glass

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

19
List price $41.99
-33% $27.99

In stock

• Audio Sensor That Detects Attempts to Tamper with or Break Your Vehicle's Glass

Stinger SHD20

Stinger SHD20 HPM Series Power or Ground Distribution Block with Satin Chrome Finish

SHD20 big
Go to item page Right Arrow Icon of Right Arrow

Stinger SHD20 HPM Series Power or Ground Distribution Block with Satin Chrome Finish

HPM Series Power or Ground Distribution Block • One 1/0 Gauge or 4 Gauge Input • Two 4/8 Gauge Outputs • Protective Cover Included • Corrosion Resistant Satin Chrome Finish

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

31
List price $39.00
-56% $16.99

In stock

HPM Series Power or Ground Distribution Block • One 1/0 Gauge or 4 Gauge Input • Two 4/8 Gauge Outputs • Protective Cover Included • Corrosion Resistant Satin Chrome Finish

Limited time!

NVX VCW124 Version 3 (VCW124v3)

2400W Peak (1200W RMS) 12" VC-Series v3 Dual 4-ohm Car Subwoofer

VCW124v3 big
Go to item page Right Arrow Icon of Right Arrow

2400W Peak (1200W RMS) 12" VC-Series v3 Dual 4-ohm Car Subwoofer

• Peak Power: 2400 watts
• RMS Power: 1200 watts
• Impedance: Dual 4 ohm
• Carbon Fiber Enhanced Non-Pressed Paper Cone
• Custom High Roll Foam Surround with black nylon stitching
• Mount depth: 7.02"
• Sensitivity: 85 dB (1W/1m)

Dads & Grads Sale! Save 15% at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $24.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

132
List price $287.99
-17% $239.99

In stock

SPL-LAB Mini Bass Meter SE (Second Edition)

Compact Sound Pressure Meter with Voltage Measure Display

Mini Bass Meter SE big
Go to item page Right Arrow Icon of Right Arrow

Compact Sound Pressure Meter with Voltage Measure Display

• Compact standalone sound pressure meter
• Measures SPL, current, maximum, and minimum voltage
• Measures speaker tunes and subwoofers
• Attachable to car windshield

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

VIP Product Get $23.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

2
List price $269.99
-15% $229.99

In stock

• Compact standalone sound pressure meter
• Measures SPL, current, maximum, and minimum voltage
• Measures speaker tunes and subwoofers
• Attachable to car windshield

NVX XIV25

16.4 ft (5 meter) 2-Channel V-Series RCA Audio Interconnect Cable

XIV25 big
Go to item page Right Arrow Icon of Right Arrow

16.4 ft (5 meter) 2-Channel V-Series RCA Audio Interconnect Cable

• Shielded noise-rejecting Twisted-pair construction
• Heavy gauge OFC conductors ensure superior sound quality
• Split-tip Silver-Plated ends offer best in class signal transfer
• Molded ends equipped with colored channel identifiers

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

43
List price $18.99
-32% $12.99

In stock

• Shielded noise-rejecting Twisted-pair construction
• Heavy gauge OFC conductors ensure superior sound quality
• Split-tip Silver-Plated ends offer best in class signal transfer
• Molded ends equipped with colored channel identifiers

Cobra CPIALCDG1

Remote Controller with Fast Charge USB and LCD Display for Select Cobra Inverters

CPIALCDG1 big
Go to item page Right Arrow Icon of Right Arrow

Remote Controller with Fast Charge USB and LCD Display for Select Cobra Inverters

• Remote Controller with Fast Charge USB for inverters
• Built-in bright blue backlit LCD text display
• Compatible with select Cobra inverters
• Features 4 mounting options
• Mounting hardware included

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

$69.95

Available

Ships in 10-14 days

• Remote Controller with Fast Charge USB for inverters
• Built-in bright blue backlit LCD text display
• Compatible with select Cobra inverters
• Features 4 mounting options
• Mounting hardware included

JL Audio VXi-HUB

JLid-Communication and Optical Audio Network Hub for JL Audio VXi Amplifiers

VXi-HUB big
Go to item page Right Arrow Icon of Right Arrow

JLid-Communication and Optical Audio Network Hub for JL Audio VXi Amplifiers

• JLid-communication and optical audio network hub
• Allows connection of multiple VXi Series amplifiers
• Connects to JLid-COMM port on VXi amps via Cat5 Ethernet cables
• Provides JLid-communication and optional S/PDIF

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

VIP Product Get $19.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

$189.99

In stock

Only 2 Left!

• JLid-communication and optical audio network hub
• Allows connection of multiple VXi Series amplifiers
• Connects to JLid-COMM port on VXi amps via Cat5 Ethernet cables
• Provides JLid-communication and optional S/PDIF

JL Audio SGR-10TW3

Mesh Grille for JL Audio 10" TW3 Subwoofers

SGR-10TW3 big
Go to item page Right Arrow Icon of Right Arrow

Mesh Grille for JL Audio 10" TW3 Subwoofers

• 10" Subwoofer Grille
• Steel Mesh Material
• For Use with TW3 Series Subwoofers
• Powder Coated Satin Black Finish

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

9
$39.99

In stock

• 10" Subwoofer Grille
• Steel Mesh Material
• For Use with TW3 Series Subwoofers
• Powder Coated Satin Black Finish

PAC BB-1PR

Pair of Bass Blocker / Passive Crossover; Removes 0-300Hz at 4 ohms, 0-150Hz at 8 ohms (BB1PR)

BB-1PR big
Go to item page Right Arrow Icon of Right Arrow

Pair of Bass Blocker / Passive Crossover; Removes 0-300Hz at 4 ohms, 0-150Hz at 8 ohms (BB1PR)

&bull Pair of Bass Blockers for 6" x 9" Speakers
• Blocks 0-300Hz @ 4 Ohm
• Blocks 0-150Hz @ 8 Ohm
• Filters Out Unwanted Frequencies Towards Speakers

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

13
List price $29.00
-45% $15.99

In stock

&bull Pair of Bass Blockers for 6" x 9" Speakers
• Blocks 0-300Hz @ 4 Ohm
• Blocks 0-150Hz @ 8 Ohm
• Filters Out Unwanted Frequencies Towards Speakers

Escort Coiled SmartCord Blue

Direct Power Coiled SmartCord with Blue LED Lights and Built-In Mute Button

SMARTCORD-COILED-BLUE big
Go to item page Right Arrow Icon of Right Arrow

Direct Power Coiled SmartCord with Blue LED Lights and Built-In Mute Button

• Direct Power Smartcord for Escort Radar Detectors
• Blue LED Light Notifies You of Alerts
• Built-in Mute Button to Silence Audio Alerts
• Works with all current generation escort windshield mounted detectors

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

3
$39.95

In stock

Only 1 Left!

• Direct Power Smartcord for Escort Radar Detectors
• Blue LED Light Notifies You of Alerts
• Built-in Mute Button to Silence Audio Alerts
• Works with all current generation escort windshield mounted detectors

Alpine KCX-CAM1

Composite RCA to Direct Camera Adaptor for Alpine Stereos

KCX-CAM1 big
Go to item page Right Arrow Icon of Right Arrow

Composite RCA to Direct Camera Adaptor for Alpine Stereos

• Composite RCA to direct camera adaptor
• Compatible with all Alpine stereos with direct camera input
• Ideal for adding any aftermarket camera
• Plug and play, no cutting or splicing required

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 $20.00
$19.95

In stock

• Composite RCA to direct camera adaptor
• Compatible with all Alpine stereos with direct camera input
• Ideal for adding any aftermarket camera
• Plug and play, no cutting or splicing required

Limited time!

NVX XCAP10H (TRUE 10 FARAD CAPACITANCE)

True 10 Farad Stiffening Hybrid Capacitor with Digital Display and Built-in Distribution Block

XCAP10H big
Go to item page Right Arrow Icon of Right Arrow

True 10 Farad Stiffening Hybrid Capacitor with Digital Display and Built-in Distribution Block

• For High-Powered systems
• Bright Blue LED Voltage Display
• Improves Bass Response (SPL)

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 $30.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

47
List price $371.99
-19% $299.99

In stock


Available Deal
XCAP10H main
Offer may end without notice

Deal Details

Buy 1 Buy a Select Amp Kit and you’ll save 15% off Get 15% off an NVX XCAP10H in your cart


• For High-Powered systems
• Bright Blue LED Voltage Display
• Improves Bass Response (SPL)

T-Spec VBTPN

(4) 0 Gauge or (4) 4/8/10 Gauge outputs with bolt-on post for factory harness retention

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

(4) 0 Gauge or (4) 4/8/10 Gauge outputs with bolt-on post for factory harness retention

• For positive or negative battery post use
• Add a Post System
• >Solid brass construction

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

7
List price $47.99
-19% $38.99

In stock

• For positive or negative battery post use
• Add a Post System
• >Solid brass construction

Omega DS-2.4

Economy Door Lock Actuator

DS-2.4 big
Go to item page Right Arrow Icon of Right Arrow

Economy Door Lock Actuator

• Single Door Lock Actuator
• Converts Manual Doorlocks Into Power Doorlocks
• Two-Wire Reverse Polarity Operation
• Universal Mounting Hardware Included

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

5
List price $19.99
-40% $11.99

In stock

• Single Door Lock Actuator
• Converts Manual Doorlocks Into Power Doorlocks
• Two-Wire Reverse Polarity Operation
• Universal Mounting Hardware Included

Single 10" Sealed MDF Subwoofer Enclosure (Belva MDFS10)

10-inch Sealed Car Sub Box Made with 3/4" MDF and lined w/ Polyfil (0.77 cu ft airspace 10SQTC)

MDFS10 big
Go to item page Right Arrow Icon of Right Arrow

10-inch Sealed Car Sub Box Made with 3/4" MDF and lined w/ Polyfil (0.77 cu ft airspace 10SQTC)

• 0.77 cu ft Sealed Enclosure
• 3/4" Medium Density Fiberboard Construction
• Durable Black Carpeting
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

121
List price $99.99
-40% $59.99

In stock

Used from: $41.99

Stinger SGP90250

High Power 250Amp Circuit Breaker w/ Built-In Distribution

SGP90250 big
Go to item page Right Arrow Icon of Right Arrow

High Power 250Amp Circuit Breaker w/ Built-In Distribution

• Stinger Select Circuit Breaker
• Power Rating: 250 Amps
• Push Button Reset
• Water Resistant Housing
• Integrated Holes for Simple Mounting
• Compact and Lightweight Design

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

2
List price $139.00
-53% $65.99

In stock

• Stinger Select Circuit Breaker
• Power Rating: 250 Amps
• Push Button Reset
• Water Resistant Housing
• Integrated Holes for Simple Mounting
• Compact and Lightweight Design

PAC BB-4PR (Orange)

Pair of 4" Bass Blockers, Blocks 0-1.2Khz at 4 ohms and 0-600hz at 8 ohms

BB-4PR big
Go to item page Right Arrow Icon of Right Arrow

Pair of 4" Bass Blockers, Blocks 0-1.2Khz at 4 ohms and 0-600hz at 8 ohms

&bull Pair of Bass Blockers For 4" Speakers
• Blocks 0-1200 Hz @ 4 Ohm
• Blocks 0-600 Hz @ 8 Ohm
• Encased in Durable Plastic Casing
• Handles Power up to 50 Watts

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

7
List price $19.00
-32% $12.99

In stock

&bull Pair of Bass Blockers For 4" Speakers
• Blocks 0-1200 Hz @ 4 Ohm
• Blocks 0-600 Hz @ 8 Ohm
• Encased in Durable Plastic Casing
• Handles Power up to 50 Watts

BBS-1 big
Go to item page Right Arrow Icon of Right Arrow

Universal Siren, works with any alarm system!

• Makes noise even if thief disconnects main car battery
• Key on/off feature to allow manual override

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

1
List price $39.99
-63% $14.99

In stock

• Makes noise even if thief disconnects main car battery
• Key on/off feature to allow manual override

NVX SDTK20

91 mil 20 sq ft Car Trunk Sound Deadening Kit (Five 18" x 32" Sheets)

SDTK20 big
Go to item page Right Arrow Icon of Right Arrow

91 mil 20 sq ft Car Trunk Sound Deadening Kit (Five 18" x 32" Sheets)

• 20 square feet sound deadening kit
• Material Used: Vibration Dampener
• Material Thickness: 0.091 (2.3 mm)
• Install Location: Trunk
• Pack includes five 18" x 32" sheets

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

123
List price $71.99
-31% $49.99

In stock

Tru Spec Dual 12in P (1460YX)

Empty Dual 12" Vented Prefabricated Enclosure for Sundown SA 12" Subwoofers

Dual 12in P big
Go to item page Right Arrow Icon of Right Arrow

Empty Dual 12" Vented Prefabricated Enclosure for Sundown SA 12" Subwoofers

• 12" Dual Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Total box volume: 3.50 cubic feet
• Compatible for Sundown SA 12V2 subwoofers (Sold separately)

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

6
List price $299.99
-22% $234.99

In stock.

Stinger SPI300

600W Peak (300W RMS) Dual Outlet Portable Power Inverter

SPI300 big
Go to item page Right Arrow Icon of Right Arrow

600W Peak (300W RMS) Dual Outlet Portable Power Inverter

• Dual Outlet Portable Power Inverter
• Surge Power Output: 600 watts
• Continuous Power Output: 300 watts
• USB port included for charging compatible devices
• Internal cooling fan keeps the inverter from overheating

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

1
List price $169.00
-74% $43.99

In stock

• Dual Outlet Portable Power Inverter
• Surge Power Output: 600 watts
• Continuous Power Output: 300 watts
• USB port included for charging compatible devices
• Internal cooling fan keeps the inverter from overheating

DS18 EQX7PRO

7-Band Graphic Equalizer with High Level Input, Auto Turn-on and LED Indicator

EQX7PRO big
Go to item page Right Arrow Icon of Right Arrow

7-Band Graphic Equalizer with High Level Input, Auto Turn-on and LED Indicator

• 7 band-Band Graphic Equalizer
• 3 Sets of preamp outputs (front, rear, and subwoofer)
• 8 volts Max preamp outputs
• Subwoofer frequency and level control
• Gold-plated RCA level inputs

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $143.99
-17% $119.95

In stock

• 7 band-Band Graphic Equalizer
• 3 Sets of preamp outputs (front, rear, and subwoofer)
• 8 volts Max preamp outputs
• Subwoofer frequency and level control
• Gold-plated RCA level inputs

NVX SDBSK2 Premium Stealth Black

91 mil 1.38 sq ft Car Speaker Sound Deadening Kit (Two 10" x 10" Sheets)

SDBSK2 big
Go to item page Right Arrow Icon of Right Arrow

91 mil 1.38 sq ft Car Speaker Sound Deadening Kit (Two 10" x 10" Sheets)

• 1.38 square feet sound deadening kit
• Solid black design for any stealth car audio installation
• Material Used: Vibration Dampener
• Material Thickness: 0.091
• Install Location: Speaker
• Pack includes two 10" x 10" sheets

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

48
List price $18.74
-20% $14.99

In stock

• 1.38 square feet sound deadening kit
• Solid black design for any stealth car audio installation
• Material Used: Vibration Dampener
• Material Thickness: 0.091
• Install Location: Speaker
• Pack includes two 10" x 10" sheets

JL Audio BassWedge CP210-W0v3

600W RMS Dual 10" W0v3 BassWedge Series Enclosed Subwoofer System

CP210-W0v3 big
Go to item page Right Arrow Icon of Right Arrow

600W RMS Dual 10" W0v3 BassWedge Series Enclosed Subwoofer System

•Dual 10" 10W0v3-4 Loaded Ported Enclosure
• 1200W Peak
• 600W RMS
• Top-Quality MDF Construction
• Durable Dark Gray Carpet Finish
• Five-Way Binding Post Connectors
• Embroidered JL Audio Logo

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

9
$349.99

In stock

Used from: $297.49

Pioneer ADT-VA133 Dash Kit

Install a new Double-DIN car stereo (Black)

ADT-VA133 big
Go to item page Right Arrow Icon of Right Arrow

Install a new Double-DIN car stereo (Black)

• Double-DIN Dash Kit
• Painted scratch-resistant black
• High-Grade ABS plastic construction
• Original factory-like fit and finish
• Includes installation instructions

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

13
List price $60.00
-25% $44.99

In stock

Only 3 Left!

• Double-DIN Dash Kit
• Painted scratch-resistant black
• High-Grade ABS plastic construction
• Original factory-like fit and finish
• Includes installation instructions

Belva BLPCAM2

License Plate Mounted Waterproof Rearview Backup Camera with Built in Night Vision

BLPCAM2 big
Go to item page Right Arrow Icon of Right Arrow

License Plate Mounted Waterproof Rearview Backup Camera with Built in Night Vision

• Universal Rear View Backup Camera
• Mounting Style: Full License Plate Frame
• Resolution: 720 x 480 
• Waterproof: Yes
• Nightvision: Infrared LED's

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

57
List price $99.99
-60% $39.99

In stock

Used from: $23.99

• Universal Rear View Backup Camera
• Mounting Style: Full License Plate Frame
• Resolution: 720 x 480 
• Waterproof: Yes
• Nightvision: Infrared LED's

JL Audio CL-RLC

2-Channel Remote Level Control and Line Driver Preamplifier

CL-RLC big
Go to item page Right Arrow Icon of Right Arrow

2-Channel Remote Level Control and Line Driver Preamplifier

• Fully Active, 2-Channel Remote Level Control and Line Driver with Pass-Through Outputs
• Minimizes Unwanted Noise
• Active Circuitry
• Control Knob
• Pass-Through Connection

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

12
$89.99

Available

Ships in 10-14 days

• Fully Active, 2-Channel Remote Level Control and Line Driver with Pass-Through Outputs
• Minimizes Unwanted Noise
• Active Circuitry
• Control Knob
• Pass-Through Connection

Stinger SGP35

500 Amp Relay and Isolator

SGP35 big
Go to item page Right Arrow Icon of Right Arrow

500 Amp Relay and Isolator

• Prevents Primary Battery Discharge
• Maximum Current Transfer
• Ideal for 2nd Audio Battery Isolation from Vehicle Systems
• 500A Constant/ 900A Peak

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

1
List price $379.00
-69% $117.99

In stock

• Prevents Primary Battery Discharge
• Maximum Current Transfer
• Ideal for 2nd Audio Battery Isolation from Vehicle Systems
• 500A Constant/ 900A Peak

NVX XLCA2

2-Channel Line Out Converter xBOOST Technology with Remote Bass Knob

XLCA2 big
Go to item page Right Arrow Icon of Right Arrow

2-Channel Line Out Converter xBOOST Technology with Remote Bass Knob

• 2-channel line out converter
• Speaker Level Input Accepts Up To 400 Watts RMS
• Bass Enhancer And Bass Compensation
• xBOOST Technology
• Selectable Auto On
• 9.5 Volt Pre-Out
• 12 Volt Trigger Out

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

34
List price $53.98
-7% $49.99

In stock

• 2-channel line out converter
• Speaker Level Input Accepts Up To 400 Watts RMS
• Bass Enhancer And Bass Compensation
• xBOOST Technology
• Selectable Auto On
• 9.5 Volt Pre-Out
• 12 Volt Trigger Out

Directed 535T

Power Window Automation System w/ One Touch Operation

535T big
Go to item page Right Arrow Icon of Right Arrow

Power Window Automation System w/ One Touch Operation

• Controls Operation of 2 Vehicle Windows
• Automatically Rolls Up Power Windows when the Vehicle's Security System is Armed
• One Touch Operation
• Auxiliary Channel to Vent or Roll Down Windows Completely from the Security System

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

1
List price $179.99
-53% $84.99

In stock

• Controls Operation of 2 Vehicle Windows
• Automatically Rolls Up Power Windows when the Vehicle's Security System is Armed
• One Touch Operation
• Auxiliary Channel to Vent or Roll Down Windows Completely from the Security System

JBL JBLSUBBPACCKITAM

BassPro Go Vehicle Installation Kit

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

BassPro Go Vehicle Installation Kit

• BassPro Go Vehicle Installation Kit
• Designed for installing a JBL BassPro Go powered subwoofer in another vehicle
• Vehicle mounting bracket, hardware and harnesses included

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 $139.95
-21% $109.95

In stock

• BassPro Go Vehicle Installation Kit
• Designed for installing a JBL BassPro Go powered subwoofer in another vehicle
• Vehicle mounting bracket, hardware and harnesses included

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 2009 S4

    Q: Can I upgrade or change the Universal-Fit Audio & Electronics in 2009 Audi S4?

    A: Yes this page includes all the best Universal-Fit Audio & Electronics that work in your S4.

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

    2003 GMC Savana

    1997 Eagle Vision

    2009 Audi S4

    2000 Nissan Frontier

    1991 Chevrolet Corvette

    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.