Question about Pioneer GM-7200M Car Audio Amplifier

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KEF PSW2000 subwoofer has power but no sound

My kef psw2000 has power but no sound. It is connected to TEAC AG-L800
amplifier. I have tried the test tone on the amp, everything works but the sub.
Is there any way to test the sub, without using the amp

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  • pothooks Dec 28, 2008

    I have the same problem with the same speaker, currently waiting for a reply from KEF support, perhaps we could keep each other informed of any progress.

  • Anonymous Dec 29, 2008

    My KEF PSW2000 is receiving power but makes a buzzing sound when power is applies [ even when the source cable is not plugged in.This problem used to be intermittent but now I can't get a thing out of the wooofer.



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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

Posted on Nov 08, 2008


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Related Questions:

1 Answer

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

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.


The address is as follows:

GP Acoustics
Eccleston Road
ME15 6QP

Mar 21, 2011 | KEF Audio PSW 4000 Subwoofer

1 Answer

How do you connect the back cables so the sound will come out right

There are four posts - two black and two red. They should be connected together, as shown in the picture. If you are missing the brass straps, simply use wire to reconnect the posts, black-black and red-red.

Then it's a simple matter of connecting the red (+) amplifier output to one of the red terminals, and the black (-) amplifier terminal to the black terminal on the KEF.

The KEF terminals can be seperated if you wish to "biamp" or "biwire" these speakers. Each black/red pair is dedicated to either the bass or the treble. For higher fidelity, some listeners prefer to run seperate wires from a single amplifier channel to each individual speaker input.clmrt5000_5.jpg

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My KEF (PSW 2150) ruffer speaker buzzes even with no input connection?

Your amplifier is bad. I sent mine to KEF in NY and they fixed it for $100 US.

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How can you bypass a subwoofer amp

If it came actively powered and permanently connected but you do not want to use the supplied amplifier, then you need to disassemble the subwoofer cabinet and disconnect the amplifier from the driver.

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I have a KEF KHT 2005.2 Subwoofer that does not produce sound any more, it makes a slight pop sound when i switch it on and thats it, no further sound. The system is about 5 years old but has not had a lot...

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:

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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KEF PSW2150 buzzing or clipping

One of the things that may cause such buzzing is a fault at the filter electrolytic capacitor (could be the main one or one of them), it may behave that way if it has a partially or totally desoldered contact pin, if the pin is broken (torn away from the cap) or if the contact of at least one of the two pins has been broken somewhere inside the capacitor.

This may often happen if the capacitors are not glued to the curcuit board which means their body will vibrate when the sub is playing at a level loud enough to shake the internal components - the vibrations may cause a soldered pin to loosen the solder around it or even the pin itself to be broken or torn away from the capacitor.



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Kef psw2000 subwoofer relay chattering

I just removed the relay and put a wire instad so the auto switch on is bypassed. When i'm not using the sub i switch it off.

Mar 16, 2008 | Audio Players & Recorders

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