High-end DAPs can be connected to the D2R USB-DAC with two types of video outputs (USB-C and HDMI), such as Youtube and U-NEXT, and audio through RCA, digital coaxial, optical square, and I2S HDMI ports. It is also important to realize MQA2 by acquiring two companies, MQA and TIDAL, which are not bankrupt, and to realize Auro3D + MQA, MQA + IMAX surround sound, and MQA + 4DX surround sound support. It is very important.