In theory by doubling your output frequency of your AC from 60hz to 120hz will makes the power supplies in your equipment act as if they are twice as large. This is because there is less "downtime" between the full positive and negative sides of the sinewave as it travels back and forth. Imagine looking at a sine-wave on an oscilloscope as it goes between full pos. and neg. The less time spent at neutral or close to it is longer time that the power supply is being charged. If you were to provide your equipment with 180hz, your power supplies would behave as if they were 3 times larger. I hope this explanation helps.
PS Audio Smoke and Mirrors?
PS Audio has power conditioners which generate their own AC signal. It makes sense to me to have a clean a properly formed AC waveform. However, on their web site they are now claiming that by adjusting the AC frequency upward (90 Hz) or by using a composite wave form (90Hz and 120 Hz), your system will sound better. How can an amp or source component that is designed to run at 120 volts and 60 HZ sound better when feed a different type of power signal. Smoke and mirrors or what?