@lordmelton Unfortunately, this is an ongoing issue for this Coop Utility in our development. The electrician says most of the homes he has done work for have voltage swings from 105-130. The extreme is like mine. There is a balance for the coop between upgrading equipment, keeping costs low (30% under SoCal Edison), and being proactive regarding fire prevention (we are in a high risk fire area).
The electrician is reworking our primary fuse box, and actually adding two new boxes, running three different dedicated lines (not just my stereo 20A line, but also two 50A lines), and rewiring some parts of the house that are not to current code (built to old code 33 years ago).
There seems to be several contributing factors to our electrical issues. I plan to go overboard to protect my equipment, and our house. I am also excited about the potential upgrade to the stereo system.
We love the house. Just under 3 acres, on the terminus rim of a canyon. I believe the Coop will continue upgrading over time. They get great reviews. They are also our internet provider and provide excellent fiber optics.