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I have recently been playing with the new sennheiser HD25 Aluminium 25th Anniversary edition Trimmed I have, since listening to them, pulled them apart to see what other changes they have made. The headband and cable are pretty much the same as the HD25-1 mk II but they have silver text on the headband and flatter hinged in aluminium to match the earcups. The cable clamp is now held in place with black t6 screws rather than silver philips screws which makes them a little trickier to pull apart as you can not longer use a standard screwdriver. Inside, the drivers seem to be identical and have the same impedance but have a different holographic seal on them. The earcups them selves have been milled from a solid block of aluminium rather than being stamped or cast and inside you can see the machine marks. They have recesses inside which are filled with foam damping where as the standard ones do not and they also have the same felt disc of sound absorbing material in there that the old ones do as we so they do have a bit more damping than the original model. Another improvement they have made is in the pads which feel more like real leather and seal on the ears better - the head pad is also slightly fatter which is nice and adds to the quality feel of them The cable seems to be the standard 2m steel cable they have used since they went to mk II so further detail may be possible to squeeze from them with a copper, silver or spc cable upgrade. Finally they come with a nice zip up case to protect them which is much better than the drawstring bag that the HD25-1 come with as standard
