NYET !!! Those guys at JVC reading my mind ? (well, obviously this thread...) These are "everything else but drivers" from HA-M750 mated to drivers from HA-S500.!!!!
This is the transplant I was going to do, succession of various pads "one more try before I do that" postponing it up to now.
JVC HA-M750 are every bit as portable as HA-S500. Mated with drivers from HA-S500, these new copycat hybrids from JVC should be as easily drivable as HA-S500. They are no bigger overall than HA-S500 + HM5 pads and fold up in about the same size as HA-S500.
One CAVEAT. A serious one. Those reports on HA-M750 breaking on headband linkages for no appearent reason, without HPs being rough treated, like falling on floor etc, are unfortunately real. My HA-M750, nicely treated, babied even, decided to disintegrated a couple of days ago while watching a movie. To be more precise, while taking them off after the movie finished. I will repair those linkages ( no easy task, as glueing alone has even less chance in the long run than unstressed plastic they are made of - some very thin, like 0,5 mm or less, steel tape reinforcement around offending part(s) is in order. )
And no, they are definitely not the end of the road. HA-M750 or these new Frankenstein copycat hybrids are like Alice in WonderCanLand for modders. These have REAL potential to sound good, better than anything possible with HA-S500.