One lesson that can be drawn from Fremer's electrical problems--remember, he thought the ATS for his new whole house generator was degrading the sonics even when the switch wasn't thrown and remained in "grid" position--was what was revealed by the team of electricians that helped him.
If I recall, he had aluminum wiring, a corroded meter block and other issues due to age and condition of the electrical system. Those things are important to address before "band-aiding" a problem with a black box. It is money well spent and an electrical system audit does not have to cost a fortune.
When I installed my whole house back up generator, I consulted Rex, who helped Fremer, and did a wiring scheme that fed the hi-fi subsystem first, before the generator switch. The hi-fi is not backed up by the generator- in an outage, I have no interest in listening to the system, but wanted to support core functions in the house, including HVAC.

