Infinity abandoned the technology and Magnepan kept developing it. We're talking about the SOUND of current production Magnepans here, not the history of the technology behind it. If Infinity had a competitive product in that realm, we'd be listening to Infinity panels today. Do you think--for even a moment--that the 1980's Infinity panel could equal the performance of today's Magnepans? If not, then the point is moot.
11-21-11: Epsilonman
infinity made planar speakers in the 70's too, i'm talking about the newest magnepan designs with the aluminum traces glued to Mylar 1.7's,3.7's, infinity had that type of planars in the 80's that's why ... etc.
Given the development of magnet and membrane technology in the past 15 years (stronger magnets, lighter membranes) it would be hard to find a panel element from 30 years ago that could compete with what we take for granted today.