Dont really know how it happened. Been using my Arcam 8R bi-wired to my KEF Q35.2's for a while now. I simply added a 8P power amp (connecting the LF cables to the P amp) and switched it all on. The speakers sort of high pitched squeeked, then I noticed Id lost my top end. It onlt seems to have affected the HF and not the LF, so I dont know what I did wrong Ive ordered a pair of new driver units from KEF at a very resonable £66.81 delivered inc vat, but before I fit 'em and goose them again, I want to know whats happening. Any ideas? PS: I treble checked I had the polarities correct, and the H & L F's the right way around.