Are all the above mentioned power conditioners and regenerators US products ? Ive never heard of them. Are there any UK users out there that can suggest how to take the first steps in the process. I suffer particularly with my 558.2 and 559 amps humming loudly at certain times of the day. At others, they are completely silent.
My dealer carries all the Isotek products but has also suggested a huge range of replacement power cables - up to the very expensive Nordost kit.

G98, HD621, 568.25, 558.2, 559, B&W 803Ds, HTM2D, 4xSCM1, ASW850, Pioneer PDLX5090 50" Plasma, Cables by Atlas and Chord