So Mike, I just read your above post; does the sensitivity of a speaker have any consideration?
...And its average impedance too.
numbers on impedence and sensitivity are not meaningless, but don't substitute for hearing a speaker with a known modestly powered amplifier. so while typically i look for above 90db @ efficient, and above 4 ohms nominal impedence.....numbers can be misleading and can be manipulated.
i guess i'm a believer in the 'first watt' is most important viewpoint. amps need headroom for that first watt to be 'wonderful' and proper design for that first watt to be refined and natural, and speakers have to be somewhat efficient to allow that first watt to communicate the whole picture.
all that said; i've had many 'special' moments with high power amps and low efficiency speakers....just never a long term love affair. we all have our personal perspectives.