^ Oh ok. My IE8 had a silver-coloured jack and it didn't give me any problems in 18 months. Neither did my HD 25-1 since I got it 12 months ago. But we are seriously derailing this thread--if you have questions about the HD 25-1, I'm sure you can find the answers on headphone-specific threads.
Back on topic: I notice the E6 cable has a tendency to not slot fully into the amp. Anyone else experience this?
Yes, it takes a good bit of force to get it in there.