Settings for PS Audio PowerPlant

Fmpnd, I had a very similiar problem. The PS1 was the quietest for my transformers. The SS5 was a bit noisy, but not so bad I wouldn't use it. SS1 was out of the question and all the others seemed to lack something. (depth and weight) So I used the PS2 80% of the time.

That became "the" issue for me with the PS300. If each setting was adding or taking something away, it seems to me that I was changing the signal and music. I bought the unit to filter and clean up the power, not as a tone control. I've gone to the Hydra, it's just nuetral, quite and runs cool. It also tends to open up the presentation better than the PS300 at any setting.

I was able to use the PS300 for my amps, pre-amp and SACD player. The presentation was best with the amps included, but the Hydra for my system is a better fit. QUITE!

Is it a mechanical hum from the physical component boxes or an electrical hum through the system?

Fmpnd: I have had hum problems too on all the higher frequency settings and all multiwave settings save PS2, but, as Drubin is asking, it was because the transformer in my equipment plugged into it (in this case, a dCS Purcell) started buzzing/humming, a common occurrence. In response to the original question, because of the buzzing and because my CD transport has an air pump, I have only used the PS2 setting, at Paul McGowan's suggestion. It certainly sounds better than any of the non-Multiwave settings to me.