... into a mini( high quality )audio system F. Linear power supply , sound clearer G,Multi-point MCU and dual LED ... design , easy operation and display , embedded upgrade reserves ! G. modular power amp design , complete separation of the motherboard , better performance and expanded ... as USB DAC, USB sound Card , Headphone –amp and Pre-amp Headphone-amp 6.5mm headphone jack, it can drive 30-300ohm ...