[John Doe[_2_]]

I'm posting to the original thread almost 3 years ago. Sorry if that
bothers anybody (not really sorry, but let me know).

Solved.

I tried a cheap Trip-Lite HDMI pass-through with audio extractor. Didn't
matter if it solved the noise problem, the audio was horrible.

Then I tried an optical digital-to-analog converter ($27 US), from the
optical output on the soundcard. Used some hot melt glue to secure the
optical cable connections, so no popping on the 96 kHz setting.

No more noise!

Sounds very nice.




--

I wrote:

INFORMATION:

The JBL LSR305s make great PC speakers, zero noise, except when
playing a flight simulator (X-Plane).

Tried two different video cards, PNY GTX980 and MSI GTX960.
Tried built-in audio and Creative Rx soundcard
Tried a different speaker cable.

The noise corresponds to what is displayed on the screen. It
changes when a menu choice is selected. Sounds like an oscillator.

Neither of my monitors have an HDMI audio output jack.

QUESTIONS:

Should I try an HDMI pass-through with audio extractor?

The soundcard has SPDIF output. But I am having trouble finding an
inexpensive SPDIF input preamp for the powered speakers.

Thanks.