Remember that AC power line snubbers need to be safety listed (UL).
The hard part is getting into the appliance to install them.
https://www.mouser.com/new/cornell-dubilier/CDE-Quencharc-snubber-networks/
Well it took an MRI to find my inner ear problem! The Cat-scan didn't show anything.
No it wasn't fun, but it's good to know what has been causing my symptoms for over a decade.
It might be interesting to look at some forums visits from year to year. I recall a few forums being very active before the COVID lockdown and now are a shadow of their former activity.
The primary task of the Protective Earth/Safety ground conductor is to trip a circuit breaker in the case of a Ground Fault (Short circuit).
True there is continuity to Planet Earth, but it has little to do with day-to-day AC power quality.
PTFE insulation and a silver plated core wire are great for a coax cable being used above about 100 megahertz.
But they don't do anything good for an audio frequency cable.
At my old R&D day jobs, one of the engineers took several large fuse to the Tennessee Valley Authority test facility. At the facility they had a bunker for the testers while they blew things up
Getting back to long RCA interconnects.
a] Coax cables with heavy braided shielded are best.
Like: Canare LV77S, Belden 1505F & 1695 and Blue Jeans Cable LC-1.
But 5 cables all from one unit to another unit reduce the need for heavy shielded.
The heavy shield is more about amp to speaker...
While we live just about 7 miles from the center-line path.
A local TV Meteorologist statistician, thinks that there is about a 70% change of it being a cloudy afternoon.
And the baseball team's Opening Day starts 2 hours later, which almost guarantees poor weather.