AmpPRO 4 AP4- Amplifier Integration Interface

The GM AmpPRO 4 AP4-GM61 is an amplifier integration interface engineered to simplify the installation of upgraded amplifiers in data-bus-controlled amplified sound systems within select GM vehicles. This interface allows you to maintain the original radio's appearance and features while significantly improving audio performance. It prevents the need for separate summing and audio correction devices, providing a direct, full-range audio output. Designed for a plug-and-play installation, the AP4-GM61 connects directly to factory wiring, minimizing complexity and installation time. It offers variable volume, fade, balance, bass, mid, and treble audio settings, and crucially, retains essential factory functions such as OnStar, Bluetooth, navigation, safety systems, and all warning chimes. The interface provides 5-volt RMS preamp outputs for front, rear, sub, and center channels, delivering a solid audio foundation for aftermarket amplifiers. It also includes a remote sub level controller and an optional TOSLINK optical output. This interface is specifically compatible with vehicles equipped with 8-inch screen displays only and is not compatible with 4-inch or 7-inch screens. It includes support for the 2019 Silverado Classic model. The AP4-GM61 fits various compatible Cadillac, Chevrolet, and GMC models from 2014-2019, including specific listings for models like the Sierra 3500 HD (2015-2019). It is essential to review the detailed fitment table and ensure your vehicle's screen size and model year align with the product's specifications to guarantee proper fitment.