The HB 48 ADSP, also called “Duke”, is 8-Channels DSP with 31-bands EQ and integrated 4-Channels Class-AB Amplifier. Charlie has 4-Channels High-Level inputs and 8-Channels RCA outputs, plus 2-Channels RCA inputs. We also add a quality 5.1 Bluetooth for music streaming and the Music Player function to be activated via USB memory. With the optional Remote you can also control the main and subwoofoer volume, select Presets and input Source, and switch to previous or next song with the Music Player, directly from your dashboard.