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

charles1dad Details Discussions Posts This discussion Message User 10,235 posts 01-09-2023 at 10:49pm Copy Comment URL Report Comment Edit Delete @asctim 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 I believe that there is solid reasoning to support this suspicion. One would indeed necessitate the other. Charles
charles1dad Details Discussions Posts This discussion Message User 10,235 posts 01-07-2023 at 01:54pm Copy Comment URL Report Comment Edit Delete @hleeid Surprisingly (to me) was finding out that my old 80 db sensitive little monitors are known to be great with tube amps. These are Rogers LS3/5a from the early 70s This represents the significance of the speaker impedance load and curve characteristics. Yes, these were very low sensitivity speakers, however they were 15 ohm impedance, so very easy to drive. The sensitivity measurement of a speaker has more to do with limits of volume/SPL for a given amount of amplifier power. How easy a speaker is to drive has more relationship and effect due to the impedance load/characteristics.People could drive the Rogers monitor speakers (82 db sensitivity) easily with low power tube amplifiers due to the very friendly 15 ohm impedance it has. Charles