Main function: 5.1 sound decoder decodes sound from HD multimedia interface, optical, coaxial, PC USB, Bluetooth, and USB flash drive playback into 5.1 independent channels of output (6 channels), which is then amplified by amplifier or active speakers for volume output. Multi input: Sound decoder supports 1 channel HD multimedia interface input, 1 channel ARC input, 1 channel digital coaxial input, 1 channel digital optical input, 1 channel digital PC USB input, 1 channel Bluetooth 5.0 input, and 1 channel USB 2.0 interface input, which can be freely switched between different signal sources by button or remote control. Sampling frequency: DSP sampling frequency is 24bit 192KHz, which can achieve accurate bit by bit sound reproduction. Enjoy decoded sound output with directional sound. After decoding, all sound details are retained in the original HD feed. Multi format support: Decoder supports HD multimedia interface version 2.0b (resolution support up to 4K and 60Hz) compatible with HD multimedia interface version 1.4. Support HDCP version 2.3, compatible with HDCP version 2.2 and HDCP version 1.4, support 3D and HDR, support DTS, DTS ES, DTS WAV, AC3, FLAC, APE, HDCD, AAC, WMV, MP3, M4A and other digital sound formats and decoding. Sound output mode: Digital sound decoder automatically detects and identifies the input digital sound signal format. If the source is 5.1CH, then hard decode (real 5.1). If the source is 2.0 or 2.1CH, then soft decode (virtual 5.1). Support 2.0CH and 5.1CH two channel output mode. 2.0CH mode is FL FR output.