The Grundig GX3900 is a premium 6.8 inch double DIN head unit designed to upgrade factory car stereos with modern smartphone connectivity, advanced audio tuning and a high resolution touchscreen display. Featuring wireless Apple CarPlay and Android Auto, the GX3900 allows you to access navigation, music, messages and calls directly from your dashboard using a familiar smartphone interface.

Designed for Australian drivers wanting a powerful multimedia upgrade, the GX3900 combines Bluetooth hands free calling, USB media playback, DSP sound tuning and multiple camera inputs in one compact unit. The short chassis design makes installation easier in a wide range of vehicles, while the built in WiFi connectivity and smartphone integration deliver a modern infotainment experience ideal for daily driving, touring and 4WD applications.

The GX3900 features wireless Apple CarPlay, allowing iPhone users to connect their device without cables and access their favourite apps safely while driving. Once connected, the head unit displays a simplified Apple interface where you can use Apple Maps, listen to music, send messages and make calls. Siri voice control allows hands free operation so you can control functions without taking your eyes off the road. Wireless connectivity means the system reconnects automatically each time you start the vehicle.

Wireless and wired Android Auto support allows Android smartphone users to bring essential apps directly to the GX3900 touchscreen. Popular navigation apps such as Google Maps and Waze appear on the display, while music streaming services and messaging apps can be controlled through a driver friendly interface. Google Assistant voice control allows you to send messages, make calls and control music hands free, making the GX3900 a practical upgrade for modern connected vehicles.

A large 6.8 inch capacitive touchscreen delivers clear visuals and responsive control similar to a modern smartphone. The 1024 x 600 display resolution provides crisp graphics for navigation maps, media playback and reversing cameras. Capacitive touch technology allows smooth swiping and tapping for faster control of menus and settings. The wide screen layout makes switching between music, navigation and camera views simple while driving.

The GX3900 includes a built in 24 bit digital signal processor designed to improve sound quality and give greater tuning control over your vehicle audio system. The DSP provides a 13 band graphic equaliser, digital time alignment and adjustable crossover settings that allow users to optimise speaker balance and sound staging. These tuning tools help improve clarity and bass response while delivering a more balanced listening experience across all seating positions.

For improved visibility and safer parking, the GX3900 supports up to four camera inputs including front, rear and side cameras. This makes it ideal for vehicles requiring additional visibility such as SUVs, 4WDs, caravans or work vehicles. The system supports standard composite video cameras and AHD cameras up to 720p resolution. The reverse camera automatically activates when reverse gear is selected, providing clear rear visibility when manoeuvring.

Bluetooth connectivity allows wireless pairing with your smartphone for hands free phone calls and music streaming. Dual phone pairing allows two devices to remain connected at the same time, which is convenient for shared vehicles. The GX3900 supports phonebook access, call history viewing and music playback control directly from the touchscreen. This makes everyday driving safer and more convenient while keeping communication within easy

Built in WiFi allows the GX3900 to connect to mobile hotspots and supports wireless smartphone integration features. This connection is primarily used for wireless Apple CarPlay and Android Auto as well as system updates when available. WiFi connectivity helps maintain compatibility with newer smartphones and operating systems while ensuring the wireless connection remains stable and reliable for everyday driving.

The GX3900 also supports smartphone screen mirroring using the MirrorAPP companion application. This feature allows certain phone content to be displayed on the head unit screen, providing additional flexibility for compatible apps that are not supported by CarPlay or Android Auto. Because mirroring relies on device compatibility, functionality can vary between phone models and operating system versions. Some smartphones may offer limited functionality or may not support mirroring.

• 6.8 inch capacitive touchscreen display
• Screen resolution: 1024 x 600
• Short chassis design for easier installation
• Wireless Apple CarPlay support
• Wireless and wired Android Auto support
• Smartphone mirroring via MirrorAPP (device dependent)
• Bluetooth 5.0 hands free calling and music streaming
• Dual phone Bluetooth connection
• Built in WiFi connectivity
• USB media playback
• USB 2.0 interface with 5V 2.1A charging
• Supports MP3 and WMA audio playback
• Supports MPEG1, MPEG2 and MPEG4 video playback
• 24 bit DSP audio processor
• 13 band graphic equaliser
• Digital time alignment
• Adjustable HPF and LPF crossover
• 4V RCA pre outs (front, rear, subwoofer)
• Maximum power output: 50W x 4
• RMS power output: 22W x 4
• Four camera inputs: front, rear, left and right
• Supports composite and AHD cameras up to 720p
• Reverse camera trigger input
• Analog steering wheel control compatibility
• FM radio: 87.5 to 108.0 MHz
• AM radio: 531 to 1602 kHz
• Operating voltage: 14.4V (10.5 to 16V range)
• Operating temperature: -20C to +70C

The Grundig GX3900 is designed as a universal double DIN head unit, making it an excellent upgrade for a wide range of factory car stereos across popular Australian vehicles. It can be installed in many models from Toyota, Ford, Holden, Nissan, Mitsubishi, Mazda, Isuzu and more when paired with the correct dash fascia and vehicle specific wiring harness. The short chassis design provides additional clearance behind the dashboard, making installation easier in vehicles with limited space and tight wiring cavities.

For a simpler upgrade solution, the Grundig GX3900 is also available in a range of Vehicle Specific Head Unit Upgrade Kits. Automotive Superstore offers over 1000 vehicle specific kits designed to suit popular cars, SUVs and 4WDs. These kits typically include the correct dash fascia, wiring harness adapters and steering wheel control interfaces required to make installation faster, cleaner and closer to a factory style fit.

Professional installation is also available at Automotive Superstore locations in Sydney, Melbourne and Brisbane. Our experienced installation teams can ensure your new head unit is fitted correctly and integrated with your vehicle's existing features such as steering wheel controls and reversing cameras for a clean, factory style result.