gdhal,
Lots of stuff inside there. I do not have any experience with the Emotiva device.
Are you experiencing a loud mechanical buzzing/humming sound coming from a torrid transformer in a piece of your audio equipment?
There is a member here on Agon that used to build DC blockers. I might be able to find his username if you need a blocker.
Edit:
Gbart is the Agon member's username. If interested you might try sending him a PM over the Agon message system.