Sounds like blown tweeters- Put one end of a paper-towel tube to your ear and put the other near the tweeter to hear if they're working. I don't know if the KEF's have tweeter fuses- you could certainly check...
Sudden Muddy sounding system
Suddenly, while cranking some tunes, my system started sounding "muddy". Almost like I blew the tweeters. I highly doubt I blew both but still have to find out what is causing this "muddiness" and lack of definition. It almost sounds like it's underwater. Any common causes of this? Thanks. I have KEF 207/2's driven by a Pass Labs x350.5 and Aesthetix Calypso preamp. Any suggestions would be helpful Sounds the same with CD and LP.