I visited here looking for info on how much power I would need for a new amp. I have been using an SPL to figure out my preferred levels and come out to 70-74 with a highest transient peak listening to metal and rock (Deftones) at 93 on one song but everything else like old prog rock (Genesis, Yes, Pink Floyd), classical piano, and acoustic guitar rarely hitting 89. Funny I came across this thread for comparison. Based on my calculations on the Crown Audio website, don't need that much power using 3.5m distance, 90dB speaker sensitivity, 75dB listening, and 20 dB headroom. BTW I am lucky to hear over 13000Hz, which makes it entertaining to play high tones through REW to clear the kids out!