[John Doe[_2_]]

FWIW... Before upgrading my main monitor last week, I tried the
built-in speakers and did not notice the noise. But difficult to
hear anything on those built-in monitor speakers.

The HDMI audio extractor (Tripp Lite P130-000-AUD4K6) should tell
that one. If there is still noise, through the 3.5 mm stereo output
jack, I will assume the SPDIF on the extractor link would not work
either, that the noise is introduced before that point.

I will lose the SoundBlaster equalizer software, using HDMI audio,
but I suppose there is a replacement.






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.