Equitech 2 Q VERSUS Running Springs, Dimitri

I had an EquiTech 2Q and is the best active conditioner I've own. I've own many and considered installing an EquiTech wall unit.

My listening room is very large so I never noticed the mechanical hum from the transformer until my brother mentioned it to me. He has 2 2Qs and his listening room is much smaller but never too loud where it interferes with the music. It's barely audible unless focus on it.

I was and my brother is using TRL PCs with the units. Paul Weitzel made them for me and is essentially a FIM/CRL PC. From my experience, it's excellent for SS and high current demand components.

Is the "noise" from the Equitech mechanical or something added into the signal? I've had a 2Q for years and no noises of any kind.

Dimitri is dead quiet, does not degrade dynamics, 2Q doesn't either, but isn't quiet. Settled for RS.