There seem to be very little info been written about dac/amp combo unit, below are some of the impression and info i found about this dac/amp combo unit.
the amp use opamp opa2134 as voltage gain for the signal, and transistors bc33825/bc32825 as buffer for current gain. it sound very similar to amp i had in the past, little dot mkv,graham slee solo, also opamp based for voltage gain and transistor buffer for current gain. they all have this very clear , good detail sound signature.
the dac use ad1955 chip, opamp based output stage ,use cs4319 as receiver chip for spdif input,and pm2704 chip for usb input. it can be used as a stand alone dac unit by disabling the amp section. the dac of this unit impressed me more then the amp, and i think this is the strength of this dac/amp section. the dac sound very smooth, does not sound thin like some of the other dac i have heard, very good imaging and sound stage, has good bass, the only complaint i have is the slight etching on the top end.
i read there are some issues with the dah1 mark1 but they seem to fixed those issues in the mark ii
photo:
test listen the amp section with k500 and hd650
some info i found out about the yulong dach1 markii, it combine the yulong ua188 amp and the yulong da1955 dac into one , i believe both are discontinued product
ua188
http://www2.erji.net/read.php?tid=607249&fpage=2
yulong da1955 dac
http://www2.erji.net/read.php?tid=416311&fpage=3
dah1 markii
http://www2.erji.net/read.php?tid=663777
