Switch out tweeters in your speakers and see if the problem follows the tweeter. If it does not, it's probably the crossover and it will need to be repaired or replaced. If the problem does follow the tweeter, then get a replacement tweeter.
If you remove the midrange driver you will be able to see the cable going to the tweeter. On the cable there is a small plug allowing easy replacing of the tweeter unit. It could be that the plug is corroded or dirty. Try cleaning the plug with alcohol and see if this will not remove the problem..
If you need parts contact Equity International 978-664-2712 & ask for the service department. They are the distributors for B&W,Rotel & Classe' & nice people to deal with.
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