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RE: Isolation Transformer For Digital Sources?

Okay, thanks.

That the noise shows up after the system is warm argues against it simply being due to some power main related ground loop, which should manifest either hot or cold. However, it may be that some electrical component is malfunctioning in a manner to permit a ground loop after becoming warm. The fact that it manifests with both CD players, or with the DAC, argues against those units malfunctioning. So, some more questions:

1. Please describe the noise? Is it low in frequency, or is it more mid-band? Is it raspy or distorted sounding, or is it more of a hum? Is it steady, or does it have more of an intermittent character?

2. Are you utilizing the same pair of analog interconnect cables between the digital source units and the preamp? I mean, do the Chord DAC, ARC player and NAD player each have their own dedicated pair of interconnect cables? Related to that question, are you using the same preamp inputs for connecting the digital source units? If you answered yes to either question, try using using a different pair of interconnects and a different preamp input.
_
Ken Newton

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