Why does better power = better sound?


Why does improving power quality improve sound quality?

I’m not asking to start an argument about power cords or wall outlets. Please let’s not go there. I’m asking because I’m hoping to learn some technical explanations for the effects of power quality on sound quality. I think I already understand how…

1. greater current availability = greater dynamic range
2. reduction of RFI/EMI = better signal to noise ratio

…but what about these…

3. ???????? = greater perceived resolution
4. ???????? = more realistic instrument timbres
5. ???????? = more precise imaging

Are differences in resolution, instrument timbres, imaging, etc. somehow reducible to current availability and/or powerline noise? If so, HOW are they reducible?

Again, I’m hoping to get into technical specifics, not polemical generalities.

Thanks in advance.

Bryon
bryoncunningham
Bryon, when you speak of power quality, I assume you are talking about the quality of the AC line, correct? The age old question about why our systems sound better at night? When there is less stress on the power grids and the electricity is better quality? Or dedicated lines taking things like refrigerators or air compressors off the lines of our audio equipment?

If so, I think the answer is just the equipment is better able to perform to the best of it's ability when it is driven with better, cleaner power. When fed dirty power, any piece of gear can struggle. That is why some manufacturer's believe that a battery supply (DC) is the only way to provide true clean power. I believe the answer to your questions 3,4 and 5 is simply that with cleaner power, the equipment is getting what it needs to reveal it's potential sound quality.

I suppose it is similar to how a car performs using different octane levels of gasoline. Yes, in cars too, some manufacturers believe that a battery is the best source for clean power.

Cheers,
John
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It probably has to do with non-optimal power supplies in equipment that cannot fully eliminate harmonic impurities or adequately deal with small scale fluctuations in power line frequency.