On Sun, 5 Mar 2017, john gibby wrote:
Hi, I have always had this problem with a little ground loop hiss, which I think I've traced down to the small current from the Power supply, used to keep the motherboard turned on. If I plug my amplifiers in without their ground plug (not a good idea, I know), I can get rid of almost all of it. I may go to a 6 d/a channel USB audio interface to get rid of it, but I wonder if anybody knows other things I can do; I wonder if it's just the design of this motherboard, or perhaps of this power supply. If I knew for sure that some other motherboard would not have this problem at all, I might upgrade to it. After a lot of testing, I am
Switching motherboards will change things, for better or worse is a crapshoot... I have found this both with internal audio and USB and in both cases the "better" MB was only better, not good. The first thing to remember is that audio and gaming are not the same. A better MB for audio is not the standard "upgrade". often a cheaper MB with fewer "bells and whistles" does better audio, has fewer things sharing irqs, has less "digital noise" floating around inside, etc.
sure that there's a spurious signal included on the analog signals coming out of my computer's built-in sound card or PCIE card, that is trying to get to ground and causing the problem.
Trying to get to ground? The inside of a PC case is noisey, even grounding aside. If you really want low noise... optical S/PDIF, ADAT, Firewire, PCI with external codecs, USB with PCIe dedicated USB port and maybe extra bits (I have not gotten good low noise with my USB AI... but for where it is... it allows my wife to use her stage mic and sound better than the internal) Get the audio bits outside of the PC case.
Really, a good PCIe Audio card is not cheap (~ $1k for 8 i/o) USB is cheaper... even with an extra cheap ADAT box.
-- Len Ovens www.ovenwerks.net
_______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
