This new DAC replaces the PCM1704-based DACs with dual FPGA-controlled resistor ladder DACs, similar in concept to DACs like the Rockna Wavedream and MSB DACs. http://www.audio-gd.com/R2R/R2R7/R2R7EN.htm Each channel uses a resistor ladder consisting of pairs of resistors to improve the...
I have the Audio GD master 7 Singularity and its a really good dac IMO. That Head - Fi thread is chock full of info and mods that you can do to them to eeek out all the performance. I ended up becoming enamored with Abbas dacs, so the Audio GD is in my office system.
Since I have 2 Abbas dacs now, I'll likely sell the Audio GD at some point, just because I'm not in a spot to go the distance with this dac to get the full mileage out of it.
I wills ay that the customer support from Audio GD is stellar. I bought my unit used and Kingwa make no issue of that and fully helped me with the firmware upgrades.