Input jack : analog RCA jack*1 , USB jack *1 USB support : 24bit/96kHz Frequency ... chip resistors, sound special ENLA electrolytic capacitors, tube, USB port, RCA terminals are gold-plated material, full ON regulator device. Amp output ... out insider impedance 100ohmUSB support24bit/96kHzInput jackanalog RCA jack*1 , USB jack *1Output jackanalog RCA jack *1 , 6.5mm jack *1 Unpack ...