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You don't necessarily have a problem with your wall power.
Try this. Set your receiver or pre-pro to an unused analog input. Then turn the volume up until you start to hear some kind of noise. If the hiss is very light and not even audible until you're a few clicks away from maximum volume, you're not likely to have any kind of power problems that are having an impact on your actual performance. Remember that the noise floor is inherent in audio gear so the small amount of noise you do hear may not be from power impurities at all but just from the noise found in most audio amplifiers.
If, on the other hand, you hear actual spikes, increases and decreases in the noise floor, then you may have a problem induced by your wall power. After years of operating audio gear in a variety of locations, I have never heard anything like this.
Equipment designers are aware of the quality of power with which their gear is used. Power supplies are designed to filter out impurities, keeping them below a point where they make an audible difference. But if you want really pure power, you can take the approach, as is done with some audiophile gear, of using batteries, allowing you to have pure DC. It looks kind of silly to have a chassis with two rows of eight D-cell batteries, but that's what people will do if they're determined to have truly pure power. And you can't argue with DC for purity.
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