Some translations from chinese forum： http://erji.net/forum.php?mod=viewthread&tid=1957261&extra=page%3D3&page=1 the introduction of x20pro Gustard is the first batch of company which is developed and applicated the ess serise with XMOS. In 2012 released the ES9018-based high-performance DAC X10, 2014 released DAC-X12, 2015 released ES9018 chip DAC-X20 and other products are welcomed by the majority of enthusiasts. But the we does not stop there.Continued to research the ESS chip , and continued to communicate with the official ESS. Recent ESS released the dac chip for the ES9018 upgrade, SIGNAL-NOISE RATIO up to 129dB, the distortion rate of -120dB compared to the widely used ES9018K2M (signal to noise ratio of 127dB, distortion-120dB) have a greater progress. We also released the the X20 upgraded version - X20pro. X20pro with two ES9028PRO dac chip-based, with matrix matrix power supply circuit and Digital and analog isolated.digital part use of adaptive master clock technology,and in the analog part applicate Class A discrete lines which has been developed for many years and could playback audio perfectly make bass both the texture and texture.mid natural and accurate. treble transparent and elegant, and has a great sound stage and excellent resolve. X20pro whether it is function,performance, or sound than the previous generation x20 has a lot of upgrading.