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RE: Isolation Transformer For Digital Sources?

Appreciate your interest, Ken.

1. The noise is always the same and always steady. It is a very high-frequency, narrow band sort of "whine" or low volume "screeching" raspy type noise. When I am troubleshooting, the volume pot is turned down, a digital device is selected, and the noise is audible. Turning on MUTE will defeat the noise. (Atma-Sphere SE preamp, which replaced a Rogue).
(I have tinnitus which comes and goes, so for a while I thought the noise was my medical issue. I have been tested and have excellent hearing for a mid-50 year old; some low frequency loss, but I can still hear 19K just like when I was a teenager).
I'm guessing that the noise is in the 5-10kHz range.

2. My components have dedicated pairs of interconnect cables, mostly Purist Audio. For the sake of testing, right now Belden IC's are connected, and I have tried each input.

The reason I am asking about the use of an isolation transformer for the digital components is because I recently tried using a Tripp-Lite Isobar for the ARC and the DAC. It's selling point is that it has isolated filter banks for receptacles and toroidal chokes.
Anyway, there were times when the digital noise was eliminated, but overall the unit was not effective. Sometimes it would suppress the noise, then the filtering would fail...about a 25% success rate.


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