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RE: Isolation Transformer For Digital Sources?

knewton, here goes...

1. I have only noticed the noise after system has been warmed up and running. Actually, digital does not have to playing, only selected on the preamp while the system sits idle. But at full operating temp.

2. The noise does stop when I disconnect the analog RCA interface between the preamp and the digital units.

4. I have removed the power conditioner and noise was still present. I have one 20a line with a duplex receptacle, so I needed the Furman in one outlet. Amp is direct into 2nd outlet.
Since the Chord DAC uses a switching PSU wall-wart and is noisy, it was removed. All tests were done with pre and ARC CDP plugged into Furman.

Additional:
- different power cords were used on the pre and the CD. Stock PC on CDP gave the most suppression to the noise.
- currently using "cheater-plugs" on CDP and preamp.
- Noise/interference was eliminated when I plugged CDP into a separate line dedicated for the washer/dryer. This is the only other dedicated line to the circuit box.


Thanks so far.

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