118-120? Wimpy. Mine averages a cool 124V, power!I had voltage sag in summer with the air conditioners running in the neighbothood.
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The only audio problem noticed was the beep-beep-beep of a power strip that includes an alarm, and will even shut down if the volts are too low.
The Power Company Engineer had the Line Truck Guys put a meter on my meter for a month.
He agreed with me, and replaced the local transformer that serves maybe eight or ten houses.
Now I get my full 118~120V at the rack.