Problems with Revel B15 Sub

I am running balanced XLRs from my Bel Canto PRe3 to their REF1000 monoblocks. Problem is, when I then run them to my Revel Sub then back to my power amps the sound becomes slightly grainy and there is audible distortion on specific frequencies of women's voices. This does NOT happen if I run the XLR's straight from my Bel Canto PRe3 into the REF1000 monoblocks.

So I borrowed another Revel B15 sub--and exactly the same thing happened! I've very carefully checked all settings on the EQ of the B15 and the drivers of my speakers--they are not blown.
The only things I could think of are:
1) The Revel is running into a different wall plug without conditioning and a cheapie AC cord for now (all other components are run through a Balanced Power Technology CPC). BAD POWER??
2) The XLR's run right behind and below a large Sony CRT TV, over the cable wire and the main plug for the BPT CPC--INTERFERENCE??