I measured asome Sennheiser HD 250 Linear II with stock pads. Subjectively, they are quite nice and balanced sounding. The bass is strong and has some nice punch, male and female voices sound surprisingly natural and clear too. That comes as a surprise, since people have been describing a recessed midrange. The peak at 8k is audible but not too much of a killjoy, the narrow dip at 6.5k indicating ringing in disguise. I am quite digging these and I am certainly going to mess with them.