Question about KEF Audio KHT 2005.2 System

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Kef subwoofer kht 2005:2

Subwoofer is on, but absolutely no sound. Can't see the green light which indicates that it is on. all configurations are checked.

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Check for the connection og the main wire is cut.. or check the supply..

Posted on Dec 08, 2008

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What is the finish on the black matt speakers


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.

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It states the power is on due to the front panel green light. I can move the sound bars up and down but there is no sound from the unit. I checked the cable etc but still no sound. I love this sub....


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

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2 Answers

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The KEF-Subwoofer range (from the PSW1000 up to PSW 3000?) have some built-in flaws in the electronic design.

I just fixed my PSW2000 working along the repairing instructions from:

http://lug.demon.co.uk/kefrepair/

Works! Costs have been about 35,- Euro for spare parts and some (too many) hours of work. If you are used to electronics and soldering you may make it in 2 hours.

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My Dad had the same problem. KEF admitted it was a paint problem and replaced the speakers.

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You have a bad set of Audio output IC's for the sub. There is two of them. TDA7293 REPLACE BOTH!!!
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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.

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