Following my previous posts, I dashed out and bought one of the model 100 centre speakers I mentioned. On comparing with my other centre speakers I get the impression that the tweeter on the model 100 has blown. However, I have noticed that there is only one set of binding posts on the back even though my hifi mags state that they are biwirable. I've checked an old issue which also confirms that they are biwirable (I thought that maybe older models were not biwirable). The space where the second set of binding posts should be is covered by a strip of paper with Kef Q technology written on it. On pressing the paper it seems that there are in fact dips under it presumably where the sockets should be. Does anyone know if these speakers could ever have been converted. Assuming this was done is it possible that the bridging bars (which would have to be internal) were not connected and therefore the tweeters are not connected? If this sort of modification has ever been done then would it be a fairly simple job to make them biwirable again, or to bridge the contacts?