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What is the rationale for 120Hz?

At one point, I read that increasing the frequency of the input AC increases the filtering efficiency of your power supply, but I don't see how that would actually be the case, unless one is using a choke input filter or one where the filtering is largely done by inductors. Otherwise, the impedance of a capacitor (the major filtering device used in modern PSs) goes down when frequency goes up. Maybe the rectifiers work better at the higher frequency. Anyway, I have a P300, and I don't mess with the frequency of the AC. Obviously, you don't want to do this with a turntable motor.

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