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Old 29th January 2012, 01:38 PM   #11
kp93300 is offline kp93300  Malaysia
diyAudio Member
Join Date: Mar 2007
Hi Felipe,
Thanks for the answer. Very helpful advice that I will follow. I want to keep the XO on the board.
SQ stands for sound quality.
I have tried different types of ground without avail.
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Old 29th January 2012, 02:03 PM   #12
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Join Date: Sep 2009
Location: Catalonia - Europe
You must keep the digital ground coming from USB.
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Old 29th January 2012, 02:55 PM   #13
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Join Date: Jan 2008
Location: Virginia
Definitely you have grounding issues. Messing with the regulators won't solve that.
You need an USB cable with all four wires, even if you use separated PS, just to connect the grounds (PC with receiver).
Use coax cable on SPDIF or shielded CAT5 if you use I2S (use the shield to connect grounds). You could also try normal CAT5E with one grounding wire taped close on it's surface.
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