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Factory Stereo Upgrades for your 1990 XJS

Go beyond factory limitations, eliminate "baked-in" equalization, and add the power your system’s been missing when you shop for specialized OEM integration tools at Sonic Electronix.

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Explore universal-fit stereo products for your 1990 XJS
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Crux VRFPR-66C

Front and Rear View Camera Integration Interface for select 2017-2022 911 and Cayenne and Macan with PCM4 System

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Front and Rear View Camera Integration Interface for select 2017-2022 911 and Cayenne and Macan with PCM4 System

• Front and Rear Camera Integration Interface
• For select 2017-2022 911 and Cayenne and Macan
• For vehicles with PCM4 systems
• Adds front and backup camera inputs plus an extra video
• Picture-in-picture mode
• Interactive parking guide lines
• Built-in on-screen display and setup
• Plug and play installation

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No Fit Icon Doesn't fit your XJS

List price $632.10
-36% $406.35

In stock.

• Front and Rear Camera Integration Interface
• For select 2017-2022 911 and Cayenne and Macan
• For vehicles with PCM4 systems
• Adds front and backup camera inputs plus an extra video
• Picture-in-picture mode
• Interactive parking guide lines
• Built-in on-screen display and setup
• Plug and play installation

Crux VRFMB-78A

Front and Rear-View Integration Interface for select 2011-2018 vehicles from Mercedes-Benz with COMAND Online NTG4.5 and Audio20 NTG45 Systems

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Front and Rear-View Integration Interface for select 2011-2018 vehicles from Mercedes-Benz with COMAND Online NTG4.5 and Audio20 NTG45 Systems

• Front and rear view integration interface
• Fits select 2011-2018 vehicles from Mercedes-Benz
• For COMAND Online NTG4.5 and Audio20 NTG45 Systems
• With OE type parking dynamic guide lines
• Front-view and rear-view camera input
• Features forced rear-view camera option
• Manual return from rear-view and front camera

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List price $632.10
-36% $406.35

In stock.

• Front and rear view integration interface
• Fits select 2011-2018 vehicles from Mercedes-Benz
• For COMAND Online NTG4.5 and Audio20 NTG45 Systems
• With OE type parking dynamic guide lines
• Front-view and rear-view camera input
• Features forced rear-view camera option
• Manual return from rear-view and front camera

Axxess AXAC-CH7

Install a New Car Stereo and Add or Retain Backup Camera in select 2018-2023 vehicles from Ram, Jeep

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Install a New Car Stereo and Add or Retain Backup Camera in select 2018-2023 vehicles from Ram, Jeep

• Direct connection to the factory harness
• Color coded wires for easy installation
• No cutting or splicing required
• Compatible with select 2018-2023 vehicles from Ram, Jeep

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No Fit Icon Doesn't fit your XJS

List price $694.99
-10% $624.99

In stock.

• Direct connection to the factory harness
• Color coded wires for easy installation
• No cutting or splicing required
• Compatible with select 2018-2023 vehicles from Ram, Jeep

Diamond Audio BTDSP66LCD

6-Channel Digital Signal Processor with LCD Display

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6-Channel Digital Signal Processor with LCD Display

• 6-Channel Digital Signal Processor with LCD Display
• Includes six inputs and six outputs
• 15-band parametric equalizer
• External Bluetooth dongle included

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$379.99

In stock.

• 6-Channel Digital Signal Processor with LCD Display
• Includes six inputs and six outputs
• 15-band parametric equalizer
• External Bluetooth dongle included

GROM Audio C-LEX

OEM Harness to Connect GROM Aux, iPod or USB Interface to Factory Stereo for select 2001-2003 LS430 and GX470

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OEM Harness to Connect GROM Aux, iPod or USB Interface to Factory Stereo for select 2001-2003 LS430 and GX470

• Connects GROM Aux, iPod or USB interface to CD changer port of car stereo
• Compatible with select 2001-2003 LS430 and GX470

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$23.99

Available

Ships in 10-14 days

• Connects GROM Aux, iPod or USB interface to CD changer port of car stereo
• Compatible with select 2001-2003 LS430 and GX470

GROM Audio C-MITS08

OEM Harness to Connect GROM Aux, iPod or USB Interface to Factory Stereo for select 2007-2014 vehicles from Mitsubishi

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OEM Harness to Connect GROM Aux, iPod or USB Interface to Factory Stereo for select 2007-2014 vehicles from Mitsubishi

• Connects GROM Aux, iPod or USB interface to CD changer port of car stereo
• Compatible with select 2007-2014 vehicles from Mitsubishi

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$23.99

Available

Ships in 10-14 days

• Connects GROM Aux, iPod or USB interface to CD changer port of car stereo
• Compatible with select 2007-2014 vehicles from Mitsubishi

GROM Audio C-VOL01

Factory Radio Integration Harness for select 2001-2007 vehicles from Volvo

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Factory Radio Integration Harness for select 2001-2007 vehicles from Volvo

• Factory Radio Integration Harness
• Compatible with select 2001-2007 vehicles from Volvo
• Provides GROM Aux, iPod, Android, Bluetooth or USB
• Connects to the back of the factory stereo

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No Fit Icon Doesn't fit your XJS

$23.99

In stock

Only 2 Left!

• Factory Radio Integration Harness
• Compatible with select 2001-2007 vehicles from Volvo
• Provides GROM Aux, iPod, Android, Bluetooth or USB
• Connects to the back of the factory stereo

Diamond Audio LOC88

400W 8-Channel Line Output Converter with Remote Bass Control

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400W 8-Channel Line Output Converter with Remote Bass Control

• Active 8-channel line output converter
• Speaker level and low-level inputs
• Selectable impedance load: 20, 60, 20k ohm
• Turn-on Modes: Remote, Vox (Audio Signals), and DC
• Ground Isolation Switch: 200-ohms, ISO, and Ground

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Universal Icon Universal – fits most vehicles.

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$249.99

In stock.

• Active 8-channel line output converter
• Speaker level and low-level inputs
• Selectable impedance load: 20, 60, 20k ohm
• Turn-on Modes: Remote, Vox (Audio Signals), and DC
• Ground Isolation Switch: 200-ohms, ISO, and Ground

Diamond Audio BE1

2-Channel Line Output Converter with Digital Bass Enhancer

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2-Channel Line Output Converter with Digital Bass Enhancer

• Active 2-channel digital bass enhancer and line output converter
• Speaker level and low-level inputs
• Selectable Load Modes: 20-ohms, 60-ohms, and 20000-ohms
• Turn-on Modes: Remote, Vox (Audio Signals), and DC
• Ground Isolation Switch: 200-ohms, ISO, and Ground

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$249.99

In stock.

• Active 2-channel digital bass enhancer and line output converter
• Speaker level and low-level inputs
• Selectable Load Modes: 20-ohms, 60-ohms, and 20000-ohms
• Turn-on Modes: Remote, Vox (Audio Signals), and DC
• Ground Isolation Switch: 200-ohms, ISO, and Ground

GROM Audio C-BPT

OEM Harness to Connect GROM Aux, iPod or USB Interface to Factory Stereo for select 2008-2012 500 and 8C

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OEM Harness to Connect GROM Aux, iPod or USB Interface to Factory Stereo for select 2008-2012 500 and 8C

• Connects GROM Aux, iPod or USB interface to CD changer port of car stereo
• Compatible with select 2008-2012 500 and 8C

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No Fit Icon Doesn't fit your XJS

$19.99

Available

Ships in 10-14 days

• Connects GROM Aux, iPod or USB interface to CD changer port of car stereo
• Compatible with select 2008-2012 500 and 8C

GROM Audio C-MAZ02S

OEM Harness to Connect GROM Aux, iPod or USB Interface to Factory Stereo for select 2002-2008 vehicles from Mazda

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OEM Harness to Connect GROM Aux, iPod or USB Interface to Factory Stereo for select 2002-2008 vehicles from Mazda

• Connects GROM Aux, iPod or USB interface to CD changer port of car stereo
• Compatible with select 2002-2008 vehicles from Mazda

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No Fit Icon Doesn't fit your XJS

$19.99

Available

Ships in 10-14 days

• Connects GROM Aux, iPod or USB interface to CD changer port of car stereo
• Compatible with select 2002-2008 vehicles from Mazda

GROM Audio C-MB

OEM Harness to Connect GROM Aux, iPod or USB Interface to Factory Stereo for select 1994-1996 C220

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OEM Harness to Connect GROM Aux, iPod or USB Interface to Factory Stereo for select 1994-1996 C220

• Connects GROM Aux, iPod or USB interface to CD changer port of car stereo
• Compatible with select 1994-1996 C220

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No Fit Icon Doesn't fit your XJS

$19.99

Available

Ships in 10-14 days

• Connects GROM Aux, iPod or USB interface to CD changer port of car stereo
• Compatible with select 1994-1996 C220

GROM Audio C-RVR

OEM Harness to Connect GROM Aux, iPod or USB Interface to Factory Stereo for select 1999-2005 Range Rover

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OEM Harness to Connect GROM Aux, iPod or USB Interface to Factory Stereo for select 1999-2005 Range Rover

• Connects GROM Aux, iPod or USB interface to CD changer port of car stereo
• Compatible with select 1999-2005 Range Rover

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No Fit Icon Doesn't fit your XJS

$19.99

Available

Ships in 10-14 days

• Connects GROM Aux, iPod or USB interface to CD changer port of car stereo
• Compatible with select 1999-2005 Range Rover

GROM Audio C-VOL94

OEM Harness to Connect GROM Aux, iPod or USB Interface to Factory Stereo for select 1994-1998 vehicles from Volvo

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OEM Harness to Connect GROM Aux, iPod or USB Interface to Factory Stereo for select 1994-1998 vehicles from Volvo

• Connects GROM Aux, iPod or USB interface to CD changer port of car stereo
• Compatible with select 1994-1998 vehicles from Volvo
• Easy plug-and-play installation

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No Fit Icon Doesn't fit your XJS

$19.99

Available

Ships in 10-14 days

• Connects GROM Aux, iPod or USB interface to CD changer port of car stereo
• Compatible with select 1994-1998 vehicles from Volvo
• Easy plug-and-play installation

Axxess AXDSPX-MI2

Install a DSP and New Amplifier to Factory System in select 2007-2020 vehicles from Mitsubishi

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Install a DSP and New Amplifier to Factory System in select 2007-2020 vehicles from Mitsubishi

• Plug and Play T-harness for faster installation
• For select 2007-2020 vehicles from Mitsubishi
• Designed for non-amplified systems
• Can be used with factory and aftermarket radios
• Selectable 31-band graphic EQ or 5-band parametric EQ
• Settings adjusted via Bluetooth in a smart device
• Selectable high pass, low pass, or bandpass filters

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No Fit Icon Doesn't fit your XJS

List price $593.99
-10% $533.99

In stock.

• Plug and Play T-harness for faster installation
• For select 2007-2020 vehicles from Mitsubishi
• Designed for non-amplified systems
• Can be used with factory and aftermarket radios
• Selectable 31-band graphic EQ or 5-band parametric EQ
• Settings adjusted via Bluetooth in a smart device
• Selectable high pass, low pass, or bandpass filters

DS18 VX2HL

2-Channel High-to-Low Line Output Converter with Speaker Emulator

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2-Channel High-to-Low Line Output Converter with Speaker Emulator

• 2-Channel line output converter
• Level matching controls
• DC offset auto turn-on (3 volts)
• Built-in speaker emulator

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Universal Icon Universal – fits most vehicles.

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$35.95

Available

Ships in 10-14 days

• 2-Channel line output converter
• Level matching controls
• DC offset auto turn-on (3 volts)
• Built-in speaker emulator

Crux RFM-MB2

Multiview Integration Interface for select 2019-2020 Sprinter 2500 / 3500XD / 3500 / 1500 with MBUX Non-Navigation Systems

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Multiview Integration Interface for select 2019-2020 Sprinter 2500 / 3500XD / 3500 / 1500 with MBUX Non-Navigation Systems

• Multiview Integration Interface
• For select 2019-2020 Sprinter 2500 / 3500XD / 3500 / 1500
• For vehicles with MBUX Systems with no navigation
• Adds front, right, left and rear camera inputs
• With OEM type interactive parking guide lines
• Supports on screen display setup
• Plug and play connection

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No Fit Icon Doesn't fit your XJS

List price $764.40
-36% $491.40

In stock.

• Multiview Integration Interface
• For select 2019-2020 Sprinter 2500 / 3500XD / 3500 / 1500
• For vehicles with MBUX Systems with no navigation
• Adds front, right, left and rear camera inputs
• With OEM type interactive parking guide lines
• Supports on screen display setup
• Plug and play connection

Crux RVCAD-81T

Front and Rear View Integration Interface for select 2016-2023 TT Quattro with 4G Systems

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Front and Rear View Integration Interface for select 2016-2023 TT Quattro with 4G Systems

• Front and rear view backup camera integration interface
• Fits select 2016-2023 TT Quattro with 4G systems
• Activates front and reverse camera input
• With OE type Dynamic Parking Assistance
• Hassle-free plug and play installation

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No Fit Icon Doesn't fit your XJS

List price $852.60
-36% $548.10

In stock.

• Front and rear view backup camera integration interface
• Fits select 2016-2023 TT Quattro with 4G systems
• Activates front and reverse camera input
• With OE type Dynamic Parking Assistance
• Hassle-free plug and play installation

Crux RVCGM-80C

Rear-View Integration Interface with AV Inputs for select 2013-2024 vehicles from GMC, Cadillac, Chevrolet with CUE, Intellilink and MyLink Systems

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Rear-View Integration Interface with AV Inputs for select 2013-2024 vehicles from GMC, Cadillac, Chevrolet with CUE, Intellilink and MyLink Systems

• Rear-View Integration Interface with AV Inputs
• For select 2013-2024 vehicles from GMC, Cadillac, Chevrolet
• For vehicles with CUE, Intellilink and MyLink Systems
• Automatically switches to rear-view
• Provides reverse camera input
• Adds 3 Audio/Video inputs

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List price $840.00
-36% $540.00

In stock.

• Rear-View Integration Interface with AV Inputs
• For select 2013-2024 vehicles from GMC, Cadillac, Chevrolet
• For vehicles with CUE, Intellilink and MyLink Systems
• Automatically switches to rear-view
• Provides reverse camera input
• Adds 3 Audio/Video inputs

Limited time!

NVX XDSP66BT (Open Box, Good)

6-Channel X-Series 15 Band Parametric EQ Digital Signal Processor (DSP) with 2.75" LCD Display and Includes Bluetooth USB adapter for Music Streaming

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6-Channel X-Series 15 Band Parametric EQ Digital Signal Processor (DSP) with 2.75" LCD Display and Includes Bluetooth USB adapter for Music Streaming

• 15 Band Parametric EQ
• 6-Channel RCA Outputs
• Provides up to 6.5 Volts of output
• Fully adjustable High and Low-pass filters
• Time alignment in 0.02 ms increments

10% Off Open Box!
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Universal Icon Universal – fits most vehicles.

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List price $349.99
-57% $149.99
$134.99 with coupon | Price details

In stock

• 15 Band Parametric EQ
• 6-Channel RCA Outputs
• Provides up to 6.5 Volts of output
• Fully adjustable High and Low-pass filters
• Time alignment in 0.02 ms increments

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    FAQ Frequently asked questions in Factory Stereo Upgrades


    Yes, you can upgrade your car's factory stereo without voiding the warranty, as long as the installation is done correctly and with compatible aftermarket accessories. Many car manufacturers understand that customers may want to personalize their audio systems, and they allow aftermarket upgrades that do not interfere with the vehicle's essential functions. To avoid any warranty issues, it is essential to choose reputable upgrade accessories from trusted brands. Additionally, consider using professional installation services or following the manufacturer's recommended guidelines when installing the upgrade components. By taking these precautions, you can enjoy an improved audio experience without affecting your car's warranty coverage.
    Yes, upgrading your factory stereo with high-quality accessories can significantly improve sound quality. Factory stereos are often designed to meet cost considerations, resulting in average audio performance. Aftermarket accessories, on the other hand, are built with audio excellence in mind, offering better sound clarity, increased power output, and improved bass response. Upgrading speakers and adding amplifiers can enhance audio reproduction and provide a richer, more balanced sound. Additionally, advanced head units with features like equalizers, sound processors, and digital signal processing can fine-tune the audio output to match your preferences and optimize the sound for your vehicle's interior acoustics. Overall, a well-planned factory stereo upgrade can transform your car's audio system into a premium audio experience.
    Factory stereo upgrade accessories are available for a wide range of car models, but compatibility can vary depending on the vehicle's make and year. It is essential to check the specifications and compatibility of each accessory with your car's make and model before making a purchase. Many reputable manufacturers provide compatibility information on their websites or packaging, making it easier to select the right accessories for your car. Additionally, consider consulting with a car audio specialist or using online resources to find accessories that are confirmed to be compatible with your specific vehicle. By ensuring compatibility, you can enjoy a seamless installation and optimal performance from the upgrade accessories.
    The ability to install factory stereo upgrade accessories yourself depends on your experience and comfort level with car audio installations. Some upgrades, such as replacing speakers or installing a new head unit, may be relatively straightforward for individuals with basic automotive DIY skills. However, certain upgrades, like adding amplifiers or integrating advanced sound processors, can be more complex and may require technical expertise. If you are unsure about the installation process or want to ensure a professional and polished result, it is recommended to seek professional installation services. Professional installers have the necessary tools, knowledge, and experience to perform the upgrade correctly and efficiently, avoiding potential issues and ensuring optimal performance from the upgraded accessories.
    Yes, but it often requires a specialized interface. Premium systems (like Bose or Lexicon) usually use a factory amplifier that sends processed signals to the speakers. To add a sub, you typically need an LOC that can handle high-voltage input or a vehicle-specific T-harness that taps into the signal before it reaches the factory amp.
    High-quality interfaces from brands like PAC or iDatalink are designed to communicate with the vehicle's CAN-bus system. They provide a "Remote Turn-On" lead for your aftermarket amplifiers, ensuring they only power up when the vehicle is on or the radio is active, preventing parasitic battery drain.
    Some modern vehicles (particularly those from Chrysler, Dodge, Jeep, and RAM) perform a "load test" on the speaker outputs. If you disconnect the factory speakers to add an amplifier, the car may think the speakers are blown and mute the audio output entirely. A load-generating device mimics the electrical resistance of a speaker, "tricking" the factory system into operating normally.

    All About

    Factory Stereo Upgrades

    When you want to add subwoofers or high-end speakers to a factory system, you need more than just a standard wire splice. Our selection of factory stereo upgrade components ensures that your new gear communicates perfectly with your vehicle’s existing computer systems.

    Line Output Converters (LOCs)

    Line output converters (LOCs) take the high-level signal meant for your factory speakers and convert it into a low-level RCA signal that an aftermarket amplifier can use.
    We carry everything from basic two-channel converters to advanced units from brands like AudioControl, which feature "AccuBASS" to counteract the bass roll-off often programmed into factory stereos.

    Digital Signal Processors (DSP)

    Factory radios are often tuned to protect cheap paper speakers, resulting in a "flat" or muddy sound. A Digital signal processor (DSP) allows you to take complete control of your acoustic environment.

    By using a DSP, you can sum signals, eliminate factory EQ curves, and adjust time alignment so that the music reaches your ears perfectly, regardless of where the speakers are placed.

    Vehicle-Specific Interfaces & Harnesses

    Cutting into your factory wiring can void warranties and cause electrical headaches. We offer plug-and-play harnesses and interfaces from leaders like iDatalink Maestro and PAC.

    These modules allow you to add aftermarket amplifiers while retaining steering wheel controls, factory chimes, and even OnStar or SYNC features.

    Why Upgrade Your Factory System?

    By integrating high-quality aftermarket amplifiers and speakers into your existing setup, you gain:

    • Increased Headroom: Play music louder without distortion
    • Full Range Sound: Restore the deep low-end frequencies that factory systems often filter out to protect small speakers
    • OEM Aesthetics: Keep your interior looking exactly as the manufacturer intended while enjoying a "stealth" high-end audio system

    The Sonic Electronix Advantage

    Choosing the right integration part can be complex given the variety of vehicle trims and "premium" sound packages (like Bose, Sony, or Harman Kardon). At Sonic Electronix, we take the guesswork out of the process.

    Our Fit Finder is the industry standard for ensuring compatibility. When you shop with us, you aren't just buying a part; you're gaining access to our expert support team and our massive inventory of the latest car audio technology. We offer competitive pricing, fast shipping, and the technical knowledge required to help you build the system of your dreams.

    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?
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    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.