@ffzz4 A couple tech questions for Roger. Others please chime in too.
Is it possible to estimate how much amp power will be enough (i.e. never clipping) simply based on speaker specs (assuming they are correct), and listening habit/situation (i.e. distance from speakers, loudness)?
If so, how?
Its rather easy. Imagine you listen at your speaker's real 1 watt sensitivity (2.83 volts for 8 ) ohms. If the speakers are relatively close and you sit at one meter and the sensitivity is 90dB and you listen at 93 then you are hearing 1 watt. The 3 dB extra is because you have two speakers. Lets say the room absorbs 3 dB and let your listening level be 90.
As you move away for every doubling of distance you loose 6 db from a point source, 3 dB from a line source and O dB from a large planar. Anyone please correct me on that. I am doing it from memory.
If you want to listen at 100 dB rather than 90 you need 10 dB more power which is 10 watts. 110 dB 10 times more at 100 watts. 120 db takes 1000 watts. It gets out of hand in a hurry.
If you want to throw out your numbers i will work it out step by step. Most people with 100 watts only need 20 or less. But we all like $100 better than $20 and its rare to see a 90 watt amplifier isnt it.
David Manly always rated his 80 watt amps at 100 watts for just that reason.