EPDR more important than impedance alone


That's Equivalent Peak Dissipation Resistance.

Info here: https://www.audiosciencereview.com/forum/index.php?threads/stereophile-has-started-calculating-epdr.15497/

(Don't be put off by ASR!)
128x128twoleftears

Good stuff

Buyers of expensive speakers need to "try" to understand the EPDR loading of them if they want to know if there amp/s are up to the task of driving them properly and getting the best out of the them.
https://ibb.co/SDSxxBB
https://ibb.co/qnwNwyF (the purple calculated epdr trace is the important one)

Cheers George

A steep phase angle can make a speaker difficult to drive.
Low impedance can make a speaker difficult to drive.
Neither phase angle nor impedance are steady over the frequency range of the speaker.
Phase angle and impedance are not tied to each other--they vary independently.
If one wants to get a better snapshot of just how hard (or easy) a speaker will be to drive, it seems to me to make sense to look at the big picture (aka EPDR) rather than a smaller one (the traditional impedance spec).