I've bought broken kef kit100 with missing subwoofer amp chips. I managed to fix other problems but two op amp chips used to amplify sub are missing. I don't know why. Tried contact KEF but they didn't respond to my e-mails. Just need to know model no of those chips.thank you

Could be caused by some cabling problem, earth cables touching, or a bad connection.

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.

You might have a bunch of bees living inside the sub?
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.

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. I would replace all 6 on your system. To insure that the other's do not go bad after fixing the bad ones.

to test a speaker you can hook up a batterie any where from AAA AA C D or a 9 volt batterie if the speaker makes a tone then it is fine and your problem is else where

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.

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.

you need to send me a request to my email address, Axel

send me a request to my email address [email protected] and I send you a fix, Axel

if you have still the problem, I got the solution from Kef USA. It is somewhat involved in taking the unit apart and replacing a resistor and capacitor. With the instructions supplied any electronic techician or TV repair man can do it in less then 1 hour. email me and I forward the instruction in PDF: [email protected] . Replace the first X with a and last X with m in my email address.