I don't think that I am quite understand the points you are making? Well yes... I was merely pointing out the factors that are being influenced by a speakers impedance and sensitivity. You would of course, need to match an amp with at least its mininum electrical requirements. I don't believe that I made any statements to the contrary? How much speaker and power you will need will certainly be determined at a minimum by the size and construction of the room. Although the sensitivity of the speaker and the type of music being played will certainly play a significant part. OK... Back in 2012, I bought a high current 250-Watt stereo amp for my front mains. I bought their (Emotiva) stereo amp that had more power than the speakers I was driving at the time. It that particular model had the largest power supply of any of their amps, with the exception of their monoblocks. It could deliver 400-WPC in 4-Ohms. I bought it because it had enough power to drive any speakers I might buy in the future. This power amp has performed flawlessly all of these years and has driven power hungry speakers like the Polk RTiA9's and the Polk LSiM707's, in both stereo mode and for HT. This amp can flat out crank.