Thanks Kingston12, going to try the XB90EX's.

They are 3 and a half years old unfortunately. Looks like a repair would cost £110. Not worth it IMHO. Time to move on I guess.

I'm pretty sure the level of bass has been decreasing for a while on mine. Tried playing with the bass adjuster (now on max), it doesn't seem to make much difference. Tried different tips too, also no good. The main reason I got these IEM's was the bass, I used to love them but now don't really...