[Raw-Tracks]

I just finished wiring up an ADC TT bay in my rack. In testing, I find I
have a few grounding issues. I've got several channel strips wired in to
the patchbay. Each one has both a line and mic level input. I've wired
both the line and the mic inputs to the patchbay. I find that when go
into the line input, I have a high level 60 cycle hum.

The mic inputs seem to be OK, so far.

The bay is laid out as follows: The left half is for my preamp i/o's and
the right side are sends and returns from my DAW. The grounds are not
bussed together on the right side, but both rows on the left side are
bussed together.

Is my problem due the fact the grounds on the line level inputs to my
channel strips are bussed together? I bought the bay used and it came
with the grounds bussed on the left hand side, so I left it that way.
It's my understanding that you want the grounds bussed on the mic
inputs, something to do with phantom power. Do you bus the output
grounds of the preamps as well? What about the line inputs?

Any helpful input is appreciated.

--
Eric

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