boy, these sound different. i've been letting them burn-in over the past few hours while burning some solder on the workbench.
i rolled in a pair of old stiff pleather pads from my AKG 240DF that are no longer being used. while the SS opens up a bit with the larger pad/ear opening, the seal is worse than the stock pads, resulting in attenuated bass response. back to stock pads - i'm getting a better seal with heat and time on my head after an hour.
i think the FR is fairly flat from top to bottom. i'm not hearing an emphasis at any particular frequency - everything sounds like it's cut from the same cloth. the bass quantity is perfect - no bloat, cuts deep, and hits hard with no over-hang. mid-range - awesome. treble - i'm getting used to it. while i'm not an "airy soundstage freak", i'm missing a bit of treble with a muffled quality.
timbre and tone - the best i've heard, maybe? but the instrument separation is poor. i think these could be very detailed cans but the instruments smearing all over each other hinders this. i understand why people mod these cans in an attempt to gain more focus and reduce the clearly audible resonances.
i'm going to mod these suckers, but i don't want to kill the dynamics with an extreme "clamp and damp" approach - baby steps. while i would love to root for the home-town Magneplanars, i'm not totally enamored with their dynamic abilities - tone and timbre are excellent though. i was expecting the Fostex to sound similar, and yes they share a lot of similar positives, but they're not as dull as i was expecting. i'm enjoying the different sonic perspective.