Impedance is just one part of the 'load' an amp sees.
perhaps even more important is the phase angle.... The difference is expressed in degrees and is primarily caused by the inductors / capacitors / back emf in or generated by a speaker.
2 speakers with similar impedance and sensitivity but way different phase angle curves will load amps way different.
This is one of the major differences, electronically, anyway between good, better, best amps. And why an amp with less 'power' will kick the butt of a much more powerful amp, which can't drive the weird capacitive/inductive/back emf load of a modern speaker.
So, not only do you need impedance data, but phase angle data as well....
I suspect the differences in some of the above posters experience is not only based on sheer power....but how each amp responded to the complex impedance of the speakers.
perhaps even more important is the phase angle.... The difference is expressed in degrees and is primarily caused by the inductors / capacitors / back emf in or generated by a speaker.
2 speakers with similar impedance and sensitivity but way different phase angle curves will load amps way different.
This is one of the major differences, electronically, anyway between good, better, best amps. And why an amp with less 'power' will kick the butt of a much more powerful amp, which can't drive the weird capacitive/inductive/back emf load of a modern speaker.
So, not only do you need impedance data, but phase angle data as well....
I suspect the differences in some of the above posters experience is not only based on sheer power....but how each amp responded to the complex impedance of the speakers.