Tweakers' Asylum

Q for further edification...

76.81.12.56

RioTubes

In Reply to: RE: You would still have a ground loop. posted by Al Sekela on July 03, 2007 at 15:13:22

assuming the amp is grounded as you described, if the source's audio zero reference is not terminated to safety-earth ground point on the source's chassis (all wood), but the source component nevertheless has a 3-prong IEC with ground blade referenced to safety earth bolt in chassis to which only ground wires from EI transformers are terminated...would the potential still exist for ground loop?

In this example, the source is a dac housed in wood chassis connected to upstream transport that has audio zero reference tied to safety earth ground.

Thanks ~ Mike

Follow Ups:

The upstream transport might complete the ground loop. - Al Sekela 11:59:30 07/04/07 (0)
The DAC by itself would break the ground loop as long as the DAC's power supply output is isolated from the AC safety-earth. However, if the audio zero reference (DAC output) is continuous with the digital zero reference (DAC input), then the AC safety-earth connection in the transport would complete the ground loop. I don't know: I wouldn't mix digital and audio zero references, but I don't have experience with DAC design.

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