Why do you need regulated power? Venezuela? Zimbabwe?
Yeah, that’s why so many voltage regulators are installed sold in the US. In at least one location I lived in a regulator kept my home voltage from spiking to nearly 130V. Within tolerances, but not my personal comfort.
Have you listened to compare with/without the regulator? Because that is the only basis on which to buy anything
It truly amazes me anyone listens to your knee-jerk proclamations about anything.
A voltage regulator is a very useful feature though thank goodness few in the US actually need them. No, the sound quality is not the way to judge need, in this case a voltage meter is the correct and only way to assess the situation.
If the OP is hearing the regulator adjusting it means he’s probably got fluctuations of 5V or more. That’s not necessarily bad, but understanding the range of V in his house and this specific circuit is varying is important. When this happened at my home it took the power company to intervene, which they never would have unless I had a voltage monitor installed. They agreed there was an issue and eventually resolved it.
All sorts of things could be going on, measurement is the quickest way to a cure.
Best,
E