Just posting to report an update on my 3-year-old pair of first-generation PXC 550: Recharging has been a struggle for a couple of years now (similar to the charging problems mentioned by others in earlier pages of this thread). When I plug in the cable, one of the following happens, seemingly...

My first pair that I bought last week had a small problem: when the ANC was at its maximum setting, the white noise hiss (that is characteristic of ANC implementations) was heard pretty much only in the left earpiece. This created a slight sense of imbalance when there was no music or podcast...

While removing hair from my Sennheiser PX-100 (Mark I) headphones, I dented the diaphragm. Immediately after I thought I could hear some distortion in the sound, especially in the mid-to-high frequencies. Below is a picture of the dent. It's about 2x1 mm in size. Sorry about the hair, I've...