My Sennheiser PX 100 - 4 yrs old are somehow now sounding dull. They've never been over driven and when I first used them they sounded amazing. Initially (although not nearly as good) they were not exactly embarrassing themselves against HD-590. They were amazing for the money but now sound crap - EQ is a must. I've airdusted the inside and washed the earpads. Any one have an idea as to why they are now dull sounding? I don't think my hearing has changed that much

I think we are all going deaf Nak d ....the m90 used to sound good to me....when i last heard mine it sounded nothing special

Could be that! But other h/phones sound good. It's the treble that's rolled off for some reason..