Is their any way to keep voltage steady?

Most power companies are running anywhere from appr 115 to 123 volts with the median figure being between 117 - 120 volts from what i can figure. To me, that is a good thing. Slight sags are not as noticeable that way and most all equipment is designed to handle those voltages. Sean
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What about phase shifts, Sean?

One possibility would be to purchase a high-capacity line voltage regulator from a surplus store. These aren't too hard to find and are usually cheap (~100 bux). They will give you excellent voltage regulation, just be sure they have the capacity to power your amp. You may then need to add power conditioning because the old VR, while it will hold the voltage rock steady, won't necessarily clean up the junk on the power line.

The important part of Darrylhifi's post is: "I notice when the meter is close to 120v the system sounds and looks {TV} better , than when the meter dips to around 115V." Is there a voltage regulator/stabilizer that can be programmed to hold at a given value (e.g. 120 volts)? this is what is needed...

I own the Moonster AVS2000 --Right now it is adding 9.00 volts to make the dif.of the 120 I should have... The TV picture is the most obvious tell-tale indication. Before I got this baby I had to wait till after 7 or thereabouts;to get a good picture.