in about 2000 I bought a pair of japanese made sony mdr-7506 headphones as required by a recording school class. nice headphones, if a bit heavy on bass, fairly clear easy to listen to. I no longer use them for any serious recording, but for amature recording and music listening. I recently got some G.A.S. for better headphones. I assumed, perhaps wrongly, that the next model up from the 7506 would be similar, but better?? I ordered a pair of 7509HD (made in thailand) and I'm pretty disappointed in the hollow sound and thin bass. to get the 7509 to sound remotely like the 7506 I have to press them tighter on my head to dampen the plastic resonances. does anyone know if there is a big difference between the japan made 7506 and thailand made 7506?? apparently thats what is available at guitar center and perhaps most american retail stores. also has the 7506 model been discontinued?? hope not... especially if its still as good as the made in japan model!