Dealing with Hum on EDP out

[Steve Ginn <sginn@mac.com>]

I am having a difficult time getting my gain structure set properly on my
EDP.  In order for me to have the output of the EDP loud enough to match 
the
rest of my mix, I have to basically turn the EDP output almost all the way
up, which introduces a very noticeable hum into the mix.

Can someone offer some advice to deal with this?

Thanks,
Steve