The fact that it comes and goes bothers me - I'd expect a ground loop to be more invariant. Does the buzz really go away or is it just masked when the sub is active?
Have you tried sending the line level LFE to the subwoofer? I'll have to check but I'm pretty sure you can just run a single low level line to your sub from LFE on those amps. The summing circuit won't care a bit. If lifting the speaker wires cleans up the signal just dial the amp xover up out of the way and do your bass management in the 1050. You might want an ICBM for the SACD.
What is your speaker configuration?
[This message has been edited by charlie (edited December 15, 2002).]
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Charlie