Quote:
Originally Posted by clpetersen
Yes , it appears to be an unusual situation with these particular McIntosh amps. It seems that the autoformer is being used as an isolation transformer. Common in surgical suites and boats. Seems unusual for a stereo.
So, in this case there is really is nowhere to connect the black wire to get a reference ground voltage - there is no such path.
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Correct in this situation the blk. wire is left unattached. My system is the same. It requires a separate wire between the amp or preamp RCA gnd. to one of the sub RCA jacks. The red and yellow are connected to the amp's right and left speaker binding posts.