My Power Measurements; make no sense. how to compute

Am trying to compute power out put of amp.

dumping power into 8ohms

using 440hz sine

example voltage; amp at +5db

peak/peak 55v (2ch powered)
rms 20v (2ch powered)

I imagine I use RMS voltage for calculation; so 50 watts? Is that right

am now thinking that makes sense, is a 100w / ch amp. and the volume prob goes up another 5db (presumably)
 
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