There have been a log of posts recently regarding ohms, watts, power requirements, speaker sensitivity etc. Does anyone know of a spreadsheet where I can plug in things speaker ohms and sensitivity, required listening levels, room size and it would calculate how many watts are required. I probably missed a few variables but I hope you get the idea. I wouldn't expect it to be perfect but go beyond the very subject messages I'm seeing now. I also recognize the problems with vendor claims regarding watts. Perhaps I'm dreaming and there is more black magic then science here.