You have a bad set of Audio output IC's for the sub. There is two of them. TDA7293 REPLACE BOTH!!!
There is 4 on one side of board,and 2 on other "also 1 small one" The the two are for the sub,the other 4 are for the main speakers/surround. They sell on Ebay for $6-10 each or a kit of all 6 for $25. Not able to find PDF
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I have the same problem with the subwoofer. I emailed KEF support and I am waiting on their response.
I have the same buzzing problem when the Keff kit100 turned on - it eventually stops but is taking longer and longer - any suggestions appreciated.
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