... quality )audio system F. Linear power supply , sound clearer G,Multi-point MCU and dual LED control, with upgrade interface H ... to 24bit /192 K D. Add the optical input interface E. Add the pure pre-amp function , the device can be used as ... appearance design 5.)Specifications : Function USB Sound Card ,DAC,headphone –amp ,pre-ampInput SIF×1 USB(1.0)×1 OPTICAL×1 , Analog RCA ...