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Unscrew the front of the speaker, hold the casing over a baking tray, repeatedly wash and work the thinners into the casing with a clean paint brush.This will gradually remove the sticky coating leaving the surface smooth and clean. Don't forget to wear rubber gloves.
It's not clear if this has EVER worked or what is new in the scenario. The STR manual has setup instructions for supporting a sub. If you want to prove the sub itself works you could jack any source like, say, a CD player, into it to prove its amp will respond BUT IT WILL BE LOUD if it works.
I wrote to Kef support about an identical issue. Their replay is below.
By the description you have given, it sounds like the power amplifier board in the subwoofer has failed.
Unfortunately your subwoofer is no longer covered under warranty as the electronics inside comes with a one year warranty as with all KEF electronics, and the warranty card would have been supplied inside the box.
However, you can return the amplifier section to us by removing the screws on the very outer edge of the back of the unit and disconnecting the cables inside. Once removed, carefully package the amplifier and then contact the Service department on 01622 672261 with the serial number to hand, they will then give you a returns number. Once you have a returns number, you can send it to the following address with a covering letter. When sending the parcel, please make sure that you send it recorded delivery or get a tracking number if sending by courier.
PLEASE NOTE THAT ITEMS NOT BOOKED IN WITH THE SERVICE DEPARTMENT BEFORE DESPATCH, MAY INCUR FURTHER DELAY.
The address is as follows:
F.A.O. SERVICE GP Acoustics Eccleston Road Tovil Maidstone Kent ME15 6QP
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.
if u are a technician then its easy to check, problems are, blown fuse, power amp IC output transistor may be blown, check for burnt componenets. changing and blowing a fuse means ur output IC or transistors are shorted.