Emu XL-7 & MP-7 User's Group

I'm getting a buzz (well, not me personally) from the main outs.  I thought I remember 
reading some posts on this quite a while ago about improving the ground for the main 
outs.  I tried searching the archives and good ol' Yahoo gives me a client server out of 
memory message.  I do remember some problem with the SPDIF out and maybe I'm getting 
the two confused.  Any ideas/suggestions?

Here's some specifics on the situation-

I replaced the outlet I'm plugging into and that helped quite a bit- noise was unbearable 
before that.

With my mixer plugged into the amp (no Emu) there's no buzzing.

I tried different 1/4" cables and it didn't help. 3' long between mixer and Emu, 10' long to 
amp.

Thanks!!
Mike