Finding (calculating?) speaker and amp impedance

I'm starting to understand why speakers with high efficiency and perhaps more importantly a flat impedance curve work well with tube amps.

If not published by the vendor/manufacturer, is there a way to determine the impedance curve from the specs that are provided?

Also, I have a pair of Magnepans that need high current amplification.

Is there a way to determine the current of an amplifier from vendor/manufacturer provided specs?

Thanks everyone!

hleeid01-06-2023 4:35am

asctim Details Discussions Posts This discussion Message User 442 posts 01-06-2023 at 08:31pm Copy Comment URL Report Comment Edit Delete I was just thinking about this issue this morning. Those who design speakers that present very difficult loads to amplifiers must believe that there is no other way to get as good a sound, otherwise why do that?
asctim Details Discussions Posts This discussion Message User 442 posts 01-09-2023 at 07:46pm Copy Comment URL Report Comment Edit Delete @erik_squires Another, and I've seen Focal do this, is that a difficult to drive speaker is seen as "discerning." No, I'm not going over this detail, either you believe me or you do not, but reviewers give far too much positive press to a speaker that shows you the difference between an integrated and million dollar monoblock. I was afraid to but almost said something along these lines in my earlier post. A hard to drive speaker can give a very expensive amp a reason to exist, and the amp can then complement the speaker's "revealing" capabilities. So both sort of act together in a mutual appreciation club. But I recall some speaker manufacturer's mantra that "watts are cheap!" to explain why he designed inefficient speakers. Apparently he thought inefficient designs sounded better overall if you just gave them enough cheap watts.