5.1 channel powerful surround sound Bluetooth for wireless connectivity. Rated Output Power (1kHz, 1ch driven) 100 W (8 ohms, 0.9% THD); Rated Output Power (20Hz 20kHz, 2ch driven) 70 W (8 ohms, 0.09% THD); Maximum Effective Output Power (1kHz, 1ch driven) (Jeita) 145 W (6 ohms, 10% THD) HDMI 2.1 with HDCP 2.2 (4 in/1 out) 4K Ultra HD support, HDR10, Dolby vision, hybrid log gamma and BT. 2020 YPAO auto calibration technology for ideal sound, Exclusive Yamaha Cinema DSP technology supports playback of HD Audio (Dolby TrueHD, DTS HD Master Audio , etc.), providing natural and expansive sound imaging