[LAU] Ground loop noise problem using MSI H-97 Gaming 3 motherboard, SeaSonic SSR‑360GP 360W power supply.

[john gibby]

I wanted to get back to this List, to let you know how things are turning
out.

I bought a used RME hdsp 9652, and a Frontier Tango24 for d/a over ADAT.
It is working pretty darn good.  I can easily run with 64 sample buffer, no
xruns (may try lower), and my digital piano app says my cpu performance
factor is 67/100, highest it's ever been.  And as some of you said, it
actually does seem to SOUND BETTER... :)  The piano sounds softer and
nicer, as if the hammer felt were softer.  The lowest bass notes sound
great; low A played with next octave A sounds better together I think. The
optical isolation between cpu and Tango has gotten rid of the bad
interference/hum I had.  I have one amp that can use 1.4v input
sensitivity, and 2 others that only can use .7v, but the Tango allows me to
set its individual outputs accordingly.  There is still very slight hiss,
which I guess is unavoidable, but I think I can reduce it by increasing the
signal level as much as I can coming from the PC, and turning down the gain
some on the amps.  Also, it may help to get rid of my 3 ams
(woofer/mid/tweeter) and replace them with just the Crown 1502 for woofers,
and a multi-channel amp for the rest (and for surround sound speakers, when
I get around to adding those.)

Thanks for all the help.   I'm happy...
John


On Tue, Mar 7, 2017 at 6:56 AM, Ralf Mardorf <ralf.mardorf at alice-dsl.net>
wrote:

> On Tue, 7 Mar 2017 06:11:26 -0500, john gibby wrote:
> >I like the idea of using the PCIE bus, to minimize latency for my
> >digital piano.  But an external (USB) audio interface would introduce
> >less than 1ms latency, and might be a good practical solution.
>
> Hi,
>
> I get lower latency with a Focusrite Scarlett 18i20, an USB audio
> interface, than with a RME HDSPe AIO, a PCIe audio interface.
>
> For both, my old ASUS M2A-VM HDMI with a 2.1 GHz Athlon dual-core, as
> well as for my new GA-B85M-D3H with a 2.8 GHz Celeron dual-core.
>
> The PCIe card not necessarily suffers more from computer emissions,
> than gear that is galvanic isolated from the computer, e.g. by ADAT
> lightpipes and one or two meters away from the computer, just the risk
> is higher that a build in card could suffer from computer emissions.
>
> Class compliant audio interfaces are better supported by Linux, than
> other audio interfaces.
>
> All pro-sumer audio interfaces I ever heard, sounded better, than any
> onboard audio device I ever heard. If the audio quality of your onboard
> audio device is all you need, then you most likely could buy any Linux
> compatible pro-sumer audio interface, no need to compare audio quality
> of different pro-sumer devices or to buy a professional audio interface.
> You still need to take care about other quality aspects. Consider to
> read customer reviews, e.g. the power supplies of some external audio
> interfaces are known to break.
>
> FWIW on my old mobo the audio hardware didn't share IRQs and on the new
> mobo the audio hardware shares IRQs, but I only experienced issues with
> my old mobo and the PCIe card.
>
> Regards,
> Ralf
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user at lists.linuxaudio.org
> http://lists.linuxaudio.org/listinfo/linux-audio-user
>
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