Hi Ralph,
Yes, but it is also true that 90 amps into 0 ohms is 0 watts (or, more precisely, some relatively small amount of power since no conductor can be exactly 0 ohms, assuming the temperature is not near absolute zero). Isn't it possible **in the case of a solid state amplifier** that the dead short is placed across the output of the amp, and the current through that short which results from application of a 10 ms signal to the input of the amp is measured?
Best regards,
-- Al