The X8 is a DAC of the AUNE X-series. It uses Aune´s self-developed FPGA technology and supports music files up to PCM768 / DSD512. The OP-amp is interchangeable and there are seven filter modes to choose from. It is a DAC purley focused on sound quality. The X8 supports music files up to DSD512 and PCM768k. It satisfies your demand for high resoulution. The X8 can be connected to a computer via USB to be an external DAC that significantly improves the sound quality. And then it can be connected to a pair of active speakers to build a HiFi audio system or a headphone amplifier (eg. The Aune X7s) to build a HiFi headphone system. The X8 can be connected tot he X5s 6th Aniversary Edition via coaxial to build a Hifi audio system that directly decodes 384k and DoP128 WITHOUT a computer, And then it can be connected to a pair of active speakers to build a small HiFi audio system in your bedroom or study , or a headphone amplifier (eg. The Aune X7s) to build a HiFi headphone system. The X8 can be connected to an Iphone / Android phone / portable music player via ist USB output. The sound quality improvement is instant. After six modifications of wiring optimizations, the X8 peripheral circuit is compatible with all kinds of dual op-amps. Different dual op-amps´characteristics can be fully displayed. The X8 has both fixed output and variable pre-amp output that uses analog potentiometer, which enables it to be either a audio source or a pre-amplifier for active speakers. The op-amp at the bottom can be interchanged with a vaitey of dual op-amps to give the sound different timbres. With such a paintbrush in your hand, you can paint your own music world. There are seven filter modes for you to choose from. Each gives you a different taste. The international edition is eqipped with high quality power supply with ultra-low ripple noise.