At my computer I have a pair of JBL Professional LSR2325 monitors. They sit on the desk, and the PC sits on the floor. The PC is connected to a USB DAC, which outputs the sound to the two speakers via Belden stereo-audio cables (3.5mm RCA style). The speakers are connected to the matching JBL LSR2310SP subwoofer via Belden XLR cables. In other words, all the cables are fairly-well shielded.
Over the past year I have been getting a lot of audible RFI from the speakers, typically in sync with periods of heavy activity from the PC (heavy network traffic, SSD read/writes, moving the wired mouse around, etc). It's audible as very faint and high-pitched modulating squealing and hissing.
Here's what I've done to try and fix it:
1. Switched out all cables (USB, RCA, XLR, power)
2. Replaced AC adapter on DAC
3. Moved DAC to different spot on desk
4. Re-tightened all PC motherboard/grounding screws
5. Swapped power strips
6. Moved speaker power cords to other end of power strip
7. Bypassed the DAC entirely
8. Plugged the power strip into a different outlet
I cannot get the sound to stop. It's driving me crazy.
I'm fairly convinced it's just [censored] power in my apartment building, as the APC power strip will occasionally indicate a "site wiring fault".
Any other things worth trying? Photo, for relevance:
Over the past year I have been getting a lot of audible RFI from the speakers, typically in sync with periods of heavy activity from the PC (heavy network traffic, SSD read/writes, moving the wired mouse around, etc). It's audible as very faint and high-pitched modulating squealing and hissing.
Here's what I've done to try and fix it:
1. Switched out all cables (USB, RCA, XLR, power)
2. Replaced AC adapter on DAC
3. Moved DAC to different spot on desk
4. Re-tightened all PC motherboard/grounding screws
5. Swapped power strips
6. Moved speaker power cords to other end of power strip
7. Bypassed the DAC entirely
8. Plugged the power strip into a different outlet
I cannot get the sound to stop. It's driving me crazy.
I'm fairly convinced it's just [censored] power in my apartment building, as the APC power strip will occasionally indicate a "site wiring fault".
Any other things worth trying? Photo, for relevance: