My hunch is that the electrical is the culprit.
You make no mention of having dedicated circuits/lines. I will assume you do.
Some to many of your dedicated circuits, lines, and/or outlets may be sharing the same phase / leg at the service panel with major appliances, furnaces, microwave ovens, refrig., and/or dimmers. Have you tried listening with all lights in the entire house turned off and perhaps most appliances off?
Considering that each of your components (including your high current drawing active speakers) should all be on their own dedicated circuits/lines and it appears that you only have two line conditioners, Id venture a guess that you may either be lacking enough dedicated circuits / lines and/or proper line conditioning for some to many of your components.
-IMO
You make no mention of having dedicated circuits/lines. I will assume you do.
Some to many of your dedicated circuits, lines, and/or outlets may be sharing the same phase / leg at the service panel with major appliances, furnaces, microwave ovens, refrig., and/or dimmers. Have you tried listening with all lights in the entire house turned off and perhaps most appliances off?
Considering that each of your components (including your high current drawing active speakers) should all be on their own dedicated circuits/lines and it appears that you only have two line conditioners, Id venture a guess that you may either be lacking enough dedicated circuits / lines and/or proper line conditioning for some to many of your components.
-IMO