Features and Functions The HB 46 II 4A is 6-Channels DSP with 31-bands EQ and integrated 4-Channels Class-AB Amplifier. It has 4-Channels High-Level inputs and 6-Channels RCA outputs, plus 2-Channels RCA inputs. We also add a quality HD 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 subwoofer volume, select Presets and input Source, and switch to previous or next song with the Music Player, directly from your dashboard. Technical Specifications - 6-Ch. DSP (31-bands EQ) - 4-Ch. High Level Inputs - 2-Ch. RCA Inputs + 6-Ch. RCA Outputs - Plug & Play ready - BT 5.1 streaming - OTG Input - Music Player (MP2.3.4, WMA, APE, FLAC, AAC, M4A, WAV, AIF, AIFC) - PC and Mobile DSP tools - Mobile Music Player App - Amplifier Power: 4 x 70 Watt (Max) - Dim. in mm: 160 (L) x 115 (W) x 45.5 (H)