hmscott
Addicted to Fun and Learning
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Yup, in fact when I asked the USA / Ebay representative for Jenving if I can return the Supra AGS-10k if it doesn't solve my problem - it costs $126 - there was a delay in response and they ended up saying:I suggest you to buy such things only if they can be returned in case they don't (sufficiently) help.
My candidates are iDefender (to cancel ground loop) and iSilencer (ANC to cancel other type of computer noise than ground loop).
iDefender works best with additional power supply, iPower is recommended. Older and cheaepr versions of these products may be okay too. But take care about the return policy before you buy anything.
"Unfortunately, the hum-buster won't deal with the problem you mention."
I would have thought breaking the RCA ground through torrid core transformer isolation - with the care stated for isolating grounds on input vs output, but they said it wouldn't, so I am not going to order it.
I followed up with a restatement of my configuration / specific problems and how it's down to connecting the RCA interconnects bringing the noise from the PC through the D90 to the A90, and asked if Jenving might have any recommendations for other vendor hardware. I'll report if they come up with anything interesting.
I'm going to keep the Supra USB cable as I'm enjoying the sound compared to the Tripp Lite with 2 ferrite cores, and neither completely gets rid of the GPU compute birdies anyway. I'm probably not going to find an appropriate ferrite core mix to reduce the noise, and I did ask Jenving as well if they had any suggestions for their cable and ferrite core compatibility.
And, in the middle of all this I am watching review video's for new motherboards with the Gigabyte Aorus B550 Master and X570 Master as my main choices and ran across this poor guy debugging a similar PC USB audio noise problem in his review build of the B550 Master.
He solved the noise on USB connection with the ifi Defender. I really wanted to avoid buying this, but it looks like the last of the noise issue needs something besides simple shielded and ferrite wrapped cables.
Gigabyte helped by sending the X570 Master, a duplicate B550 Master and a couple of other B550 models - which ended up helping solve the problem(s) and changing his motherboard choice - back to my pre-B550 choice the x570 Master.
The first B550 Master was buggy. Interesting Case grounding interaction too with the R6 case I was also going to get... now I'm looking for another case.
If you are interested in this sort of thing I recommend watching the whole vid + his previous, the link below starts at "I Figured It Out!"
9:07 - Update: I Figured It Out!
Note: in case you already don't know this and didn't watch the video, you'll want to avoid RGB Memory if you want to avoid noise induced by them - and likely other RGB - as the high pitched sound he hears was from the RGB memory, likely the "dimmer" controller. Even after solving all the issues to root cause, he still needs the ifi Defender to stop the GPU noise. Sigh...
I'm actually in a pretty good spot right now with my B450 3700x 2070 Super USB noise situation. I have no noise with the XLR only, and by adding the RCA connections to the mix I don't have any added noise now with the Supra USB cable - unless I use GPU compute. There is probably additional noise coming along that ground path that aren't "audible" but suck amp resouces - those I would like to get rid of too.
On Amazon US the ifi Defender+ in A/A configuration has shot up to $110 with the other configurations being much cheaper - $49 ...
I found another Amazon listing as a $125 bundle iFi iDefender+ CA + iPowerX 5V (save $24 with bundle) that I can use to test with / without the power with the D90 MQA (and other powered USB devices), I'll report back on how that works out. There is a cheaper $89 iFi iDefender+ CA + iPower 5V bundle (save $9 with bundle) with the previous design iPower (non-X) power supply, I went with the newer iPowerX (bundle).
I really didn't want to get a "dongle" solution, but it's a lot cheaper than the other isolator / converter alternatives and the ground breaker + external power solution should be transparent to the audio.
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