I have not, for some reason, always thought they were keyed so wouldn't fit so didn't try. Will give that a go now. EDIT: Swapped cable around and still issue with the right side.

So, i've had a pair of HD 650's for a coupe of years now and for the past couple of moths they have developed an odd fault. Every now and then the right cup will cut out for a few seconds. it appears to be when i move around in the chair, e.g. sitting upright from reclined etc. I have replaced...