Its Orthodynamic (planar) and I'm listening to a set of Orthos right now which are from the 70s!
This technology is as old as dirt!
Every technology has compromises, honestly the only way to have everything perfect is to use multiple drivers tuned for different things and make them work together.
Isodynamic, orthodynamic, and planar magnetic are all names for the same technology. Orthodynamic is just the name that gained popularity, I believe they were originally called isodynamic. Regardless it's all the same thing. It's also the youngest of the three main technologies. Dynamics came about in the 30's, electrostatics came about in the 50's. Though the concept of the design on both dynamic and electrostatics is older. The concept of electrostatic earspeakers originates from Eugen Beyer I believe, not the first to implement it, that was STAX with the SR-1. Just as Beyer was the first to implement the dynamic headphone design in the original DT 48, but I don't think he invented the concept. Information on the history of headphones is very obscure sadly.
Last edited: