Yeah - I need to know about the N900 per se until I'd be OK using it. Signs of multiple earphone failures being reported occasionally are usually head/earphone-fatal DC leaks happening in certain situations.

It's not quite that I'd 'make sure that you could replace them' - of course I can - but obviously at $1100 for my portable earphones and $1700 for my portable headphones I'd rather they didn't get fried every few months.