(As long as the sound is from computer, built-in speakers, external speakers, earphone, power amplifiers, hotel mixer or 7.1 surround speakers can be used.) Insert the volume regulator into the computer USB port the audio output device directly inserts into the computer 3.5mm earphone hole.Analog audio can be converted with an onboard DAC and amplifier inside your phone. There are two ways to send audio data through the USB port, and I'll bet you can guess them: Analog and digital.Optical TOSLINK Input and Output as well as an S/PDIF Input make the USB PhonoPlusPS an ideal analog / digital audio to USB interface as well. The USB PhonoPlusPS can also act as audio playback source for any USB equipped computer or laptop. The USB Monitor/headphone provides zero latency monitoring of the input source for easy cueing.Tube buffered output, tube installed is GE5670 3 mica tube. The four (4) digital inputs are independent to each other, only one among them will be active and is controlled by the physical switches located in front panel. Total four independent digital inputs BNC, USB, RCA and Toslink.
