Specifically, I am having a difficult time figuring out how much power supply I will need for an Aleph-60. The circuit seems to be able to swing 64V peak to peak, which equates to 22VRms. Using the formula P=V^2/R, I get a power output into my speaker (minimum impedance of 3.2 ohms) of about 150 watts (RMS). Using the formula I=sqrt(P/R), I get a current of about 6.8A. Now, I am assuming that this is an RMS amperage, as the voltage that I was using to get 6.8A was an RMS voltage. Does this mean that my power supply will have to deliver 19.23 amps peak to peak?!! If so, is that 19.23 Amps from both rails, or half from each rail?

On a similar note, I have always assumed that speaker manufacturers rate their sensitivity based on 1W RMS. Is this also correct?

Isn't there a standard for how power is rated? If anyone knows where I can read about it, please let me know.

Steve