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Audio-gd products had design and test based on the AP SYS-2722 (The top-drawer professional equipment in world)


Fully balanced design, the gain stages and pre-driver stages work in class A, built with discrete analog stages without any OPA or coupling caps in the signal channels.
The output transistor stages work in high idle current state . The Diamond Cross output stage design avoids "switch distortion" as well as class A amps.
Non- feedback ACSS analog amps.
2 analog inputs:  XLR / ACSS
Applies 24 pieces of ON Semiconductor  “the King of transistors” MJL4281/4302. Supports 250W X2 (8 Ohms) output.
 The capacitance of the whole machine reaches as high as 140,000 uF, with two 750W (Total 1500W) core transformers and separate power supplies for the right channel and left channels.
A total of 4 groups of high-quality class A parallel connection PSU's supply the gain stages.
Applies all audiophile grade components, including DALE resistors, WIMA caps, custom order NOVER (UK brand) caps, all audiophile grade input & output sockets and gold IEC socket. Applies the round-corner style chassis which has lower syntony or vibration. Between the transformers and signal amps resides a thick metal plate to avoid interference.

Note:
                     Master-3 can work with all balanced preamps worldwide via the XLR input, but the ACSS inputs can only work with Master series preamps.
Advice:    1, Master-3 has extremely high fidelity; its SQ is neutral. It reveals how good or bad a recording or source is.
                     2, It is better not to stack gear on top of each other, if it's necessary to stack Master-3 on other gear, place a peice of paper or other insulating material on top of other gear, as the Master-1 has conductive aluminium feet.
                     3, Attention must be given to matching suitable power cable and signal cables.

A review of our preamp and power amp from John Darko.
http://www.digitalaudioreview.net/2011/09/audio-gd-c39-mk3-pre-and-c10-se-power-acss/