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In Reply to: RE: Pass Labs INT-250 posted by gbeard on March 14, 2017 at 04:50:02
For me, the white grounding post does not get rid of the hum. If I connect the black Neutrik wire from the sub to the black binding post of the speaker, the sub does not hum. However, I've been informed that this connection is problematic with a balanced amp such as mine because the black speaker terminal is driven to negative voltage and is not ground. Apparently, at issue is that REL typically connects their ground to the third pin of the AC mains power cord. In that case the negative DC rail of the INT-250 is driving straight to earth ground.... not good practice. If you have two subs, no problem.
I wasn't convinced the sub was really necessary with the 3.6s, so rather than risk damaging either the amp or the sub, and rather than try to connect rca connections, I decided just to remove the sub.
Certainly you don't want to risk damaging your beautiful equipment. And as you said, no, don't plug it into the neg speaker post.
I have had similar issues with balanced gear, like the Benchmark AHB2. I don't know why I am not having any problems with the INT 60 (or my XA30.8 for that matter), and you are, but it's not the first time I've heard of this with other gear, just not Pass Labs.
Maybe I need your other Strata III! :))
Enjoy the amp. I'll bet it sounds great on those Maggies!
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