Portable digital audio player. DX220 is the first to support two-way Bluetooth 5.0 portable player, providing native support for LDAC and aptX. Full metal CNC back cover + antenna reflection cavity, full metal coverage of the fuselage, the antenna is completely literate. Out of the body, completely eliminate the interference. The powerful professional parameter EQ DX220 adds a more professional parameter EQ in addition to the 10-segment graphical EQ, providing a total of 8 full-type high-precision filters in 6 segments. Each segment of the filter can be individually set to adjust the F value, Q value and gain, with detailed visual adjustment capabilities. Support for MQA music decoding The MQA format draws on recent research in auditory neuroscience, digital coding and high-quality sound perception. MQA files created using Origami folding technology can provide ultra-high resolution playback at low capacity on a supported device on a supported device. The DX220 supports decoding of MQA in X4 mode, which greatly improves the quality of source files. Provide hardware support for HD streaming such as Tidal.