[John Doe[_2_]]

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.