The real measure of an amplifiers ability to drive speakers is current. Current is not a standard measurement, but you can indirectly measure it by measuring the watts at different impedance. Regardless of what speaker you are using you want the one able to produce more current. The closer to watts doubling between 2, 4, 8... the better. I have had massive amps driving speakers not requiring the power and given all things equal the more powerful the better the sound. So for instance my Pass x350 sounded better than a Pass x250.
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There are specially speakers made to be driven by flea powered amps... I assume if you were in that category you would know it.
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Conversely some speakers require lots of power. They don’t do this to be difficult, they have a reason. This is overly simplified. Consider a speaker with a light weight magnet and light material to pull the cone back... it pushes the cone around easily. It also requires little power to do so. But the cone is not stiff and it takes it’s time coming back once extended. So the sound is flabby. Now stiffen the cone and add massive magnets... it requires much more power... but it makes very fast excursions and the cone doesn’t deform while trying to do different sounds at the same time. Much more accurate sound. .
so it is important to find speakers you like and power with at least enough. From my experience if you have a choice of two identical sounding amp the one with greater current grabs the cones better and makes them do what they are supposed to be doing.
.
There are specially speakers made to be driven by flea powered amps... I assume if you were in that category you would know it.
.
Conversely some speakers require lots of power. They don’t do this to be difficult, they have a reason. This is overly simplified. Consider a speaker with a light weight magnet and light material to pull the cone back... it pushes the cone around easily. It also requires little power to do so. But the cone is not stiff and it takes it’s time coming back once extended. So the sound is flabby. Now stiffen the cone and add massive magnets... it requires much more power... but it makes very fast excursions and the cone doesn’t deform while trying to do different sounds at the same time. Much more accurate sound. .
so it is important to find speakers you like and power with at least enough. From my experience if you have a choice of two identical sounding amp the one with greater current grabs the cones better and makes them do what they are supposed to be doing.