I just dug out two over-ear headsets that mostly sat in a drawer for probably the last 4 to 10 years - a Sony and a much older Koss from the 90s I guess. Neither were audiophile quality but last I remember they sounded fine, but today the Sony is lacking low end and the Koss is missing both lows & highs. Neither sounds rattle-y or distorted otherwise and they respond well to some graphic eq. I'm hoping the diaphragms are just a little stiff and need some rawk pumped through them for a while (as do I). But I suppose it could be aging magnets or deterioration in general. My other more expensive Sony's have been idle for awhile too but they still sound great regardless of my general disdain for Sony. Opinions? Experience? Wisecracks?