Something weird has happened. I have the kensingtons and have been running them with the front controls set at Treble output Flat. Frequency cut off at +2db. All positions worked before but tonight I thought I'd drop the frequency cut off to flat - nada, no output on one speaker. I tried all positions - nada. Only the +2db is working. But they used to. What the hell has happened and how? Any ideas guys....

Something happened last night which prompted my messing. I was playing Dead Can Dance Into the Labyrinth - final track Wind among the Barley and there was a buzzing in sympathy as a certain very very high note was sung. I put this down to end of side distortion and adjusted anti skate - I didn't recheck it. After all I was playing at around 25w and the tweeters are supposed to take huge amounts of power. And no way was the audio research into clipping.