Thanks, "bam" was my reaction as I have had it, hah. I just don't know where to begin again. Brand new 20 amp circuit with isolated ground, I was sure it would be pin drop quiet at this point. Also the 2 brand new Panamax 5300's. I am just so drained from all this. I just want to sit back and relax and enjoy my equipment, but this darn noise is killing me.