I don't know, but since the performance of dynamic drivers is now hard to drastically improve, why not try to enhance with some active technology..? I would like to see an engineers perspective on the reasons why or why not to do this.
If it sounded better, I see no reason why some head-fiers wouldn't be interested of such concept.
But anyway, Sophisticated, granular EQ requires complex circuits that are quite bulky. Anything else, like counteracting square wave overshoot, slow impulse reaction, harmonic distortion, etc, will require DSP. To do that, and to make it into a one puece package, we would have to do this:
Digital file>desktop DAC>desktop amp>special-custom-analogue to digital converter in the headphone>DSP> special-custom-DAC> headphone driver. That sucks, and all that conversion would sound terrible.
If we applied the corrective DSP on the computer / DAC end, well, that'd be interesting, but I don't see it happening in a way that can make a Grado sound like Sennheiser HD800. There is only so much that can be done to counteract physics.
Edited by Chromako - 10/4/13 at 2:45pm