i have no technical experience or reference.
OTOH i do use an Equi=tech 10WQ Wall Panel System which uses a 10kw balanced isolation transformer for my audio circuits in a dedicated room. i have all the lights, HVAC and non audio electical on a separate panel. forgetting the performance advantages across the board, which are considerable, since i installed the Equi=tech last summer, when the lights flicker my system is not affected, it plays along unaffected. and twice when i had power outages my system continues playing for 4-8 seconds after the lights go out. my amp blows a fuse if the power is turned on and off quickly, as that triggers the protection circuit. so now i have a buffer of time to get up, walk over and turn it off.
does my experience indicate that spikes are reduced or eliminated. i don't know. but it seems like i have considerable protection from the bad stuff.
OTOH i do use an Equi=tech 10WQ Wall Panel System which uses a 10kw balanced isolation transformer for my audio circuits in a dedicated room. i have all the lights, HVAC and non audio electical on a separate panel. forgetting the performance advantages across the board, which are considerable, since i installed the Equi=tech last summer, when the lights flicker my system is not affected, it plays along unaffected. and twice when i had power outages my system continues playing for 4-8 seconds after the lights go out. my amp blows a fuse if the power is turned on and off quickly, as that triggers the protection circuit. so now i have a buffer of time to get up, walk over and turn it off.
does my experience indicate that spikes are reduced or eliminated. i don't know. but it seems like i have considerable protection from the bad stuff.