Hi, I've used K450 for 6 months, and K480NC for 3 months.   at first they were OK, but now I feel their bass is too muddy.   the amount of bass and reverb is both excessive, causing masking of mid-high range.   I disassembled them, and found some ducts behind the unit.   by...

I've never used IE type headphones.   I'm using Aurvana Air, AKG K540, K450, Senn HD238(internal sponge removed) and satisfied with their sound.   Since using OE type headphones will sweat me a lot in summer, and Air cannot block so much noise,   I'm looking for some IE type...