This is your chance to own a classic, never to be made again pair of products. Sounds as good as they look, audio jewelry to the eyes and ears.

SOLD ONLY AS A PAIR, CONUS ONLY

Reference-5
 

DSP-1 inside
Using 4 Pieces of PCM1704UK Chips
ACSS/XRL/RCA output balanced DAC
Coaxial/Optical/USB input
Supports up to 24Bit/96KHz

Product page; http://www.audio-gd.com/Pro/dac/RE5/RE5EN.htm

Roc Headphone amp/ Preamp review

https://www.head-fi.org/threads/review-audio-gd-roc.452977/

Quote

Conclusions:
This is definitely an excellent amp at this price. It's very dynamic and will certainly drive most headphones to their full potential. This amp is an exceptionally good match for the HD600 and K702 and really does drive them properly. I can firmly say tht I highly recommend this amp.