I bought a pair of Sennheiser CX300s about 2 months ago and they were working fine, great sound etc. Anyway, I havent used them for a week or so, and now every time I've tried to listen to music in the past 3 days I've had this weird problem... The earphones themselves seem to be working perfectly - I tested it by comparing them to my ipod headphones; I booted the volume up full and compared the loudness and they sound pretty similar, but when I put the cx300s in my ears it sounds as though the volume is either very low or non existant, I'm getting a good seal, theyre right in my ears and everything and yet it's unbelievably quiet, people im sitting beside can still hear the music when the earphones are in even when I can only hear very very quiet sound - this is with the volume at or near maximum. The ipod seems fine as it works perfectly with my ipod earphones and I've made sure the volume limit isn't on... I'm just completely stumped because when I have the earphones in my hands and the music turned up to max volume I can hear the music fine. I've checked the rubber things to make sure theyre on right, and Ive tried using different sizes, but it hasn't helped - has anyone ever experienced something like this before?