I have all my A/V gear going through this:

http://www.mitcables.com/?option=com_vir...9&product_id=94

From there, a PowerMax bar is connected to the TV, DVD, VCR, HD/DVR box, and a Rotel bar is connected to the 990, 7500, LFM1Plus, CD player.

I don't get any hum from my 7500, either through the speakers for from the unit it self.