Someone was asking about
sound on D945GCLF
When I first got it it was connected to 2 channel
amplifier and everything worked well.
Then i decided to use 4-channel capability and configured appropriately in the
software. Now line-in on the back of the board should be connected to rear speakers. When I restarted CPC I heard strong noise coming from rear speakers which lasted until PC booted (probably until Audio driver was loaded). Also, when driving later I noticed very silent but still noticeable whining noise that did not exist before.
I spent few hours researching noise/whining related posts and then even more hours trying out some possible solutions like rerouting wires, grounding CPC chassis, moving grounding point to what seemed to be a better location - nothing helped.
I guess there is something wrong with this blue input/output jack that is used as rear output in 4-channel mode. It produces noise till the driver is loaded like if "line-in" is the default mode and is switched to rear spk output mode only when driver is loaded (same noise reproduced when switching to 2-channel mode with rear speakers connected to line-in jack).
If anyone knows a solution, I'd be glad to hear about it. Meanwhile, I just reverted back to using 2-channel mode and connected rear and front speakers to the amp to same jack from CPC (regular "green" spk output).
No complaints about other components, very nice mb wrt performance.
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