Question about KEF Audio PSW 4000 Subwoofer
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
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:
Posted on Aug 03, 2011
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Posted on Jan 02, 2017
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