Presenting compact Class-D design amplifiers, featuring a comprehensive array of functionalities including multi-source mixing, USB/SD card/FM tuner audio playback, and seamless Bluetooth streaming capability. These amplifiers serve as an all-in-one solution, combining amplifier and audio source functionalities within a single rack unit. Perfectly suited for diverse environments such as retail spaces, offices, venues, and other commercial establishments, they offer unparalleled convenience and performance.