BTW, respectfully, the answer to the question about the differences between the 2500 and the 750 discussed in this thread has not quite been complete thus far.
IME, additional differences between the two besides the opening in the back of the 2500 is that the ear pads also differ between the 750 and the 2500. The pads on the 2500s have ventilation holes in the plastic underneath the velour, whereas the 750 pads are "solid," providing a more complete seal to the wearer's ear. This is necessary to compensate for the open baffle of the 2500. If you were to use the 750 pad on the 2500, the bass would be way overblown, likewise, using the 2500 pad on the 750 would result in very thin, anemic sound.
Hope this helps clarify some things.
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