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My KEF Model 25B (Serial # 67119) emits a loud popping sound every time the bass signal/input is required from the sub woofer. Believe the popping sounds is coming from speaker. The popping sound comes on when the green light initially comes on. I'm not positive but I believe the popping is only when the bass is required not when the signal is not. I do know that the need for sub woofer ebbs throughout a song or movie. You can imagine how disruptive it can be. I have unplugged it to protect what ever is left of the speaker, and our ears. Thank You for any assistance!

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Sunfire True Sub Constant Hum & Thump on Initial Signal

The problem in the subwoofer is at leat 4 bad components
degraded due to heat. Remove the module and ship to
Mr. Transistor 453 Opelika Rd. Auburn, Al 36830.
If your sub is thumping and not staying on at lower levels
I have the fix. Cost is $250.

Posted on Feb 09, 2009

  • 9 Answers

SOURCE: Speaker light in the back turns on(green) but no sound

Well, I will try and help. If there was a problem with any of the innards, ie your amp. It's most likely that the red light would come on ar some horrible sound would be emitted from the woofer. reguardless if there was any input. But let's troubleshoot this anyways.

If you are using the low level input (RCA cable) try hooking it up to something else, if you can. This will determin if it is at all the sub or if it's your amp. Then try using the high input. This requires the speaker terminals in the back. If it works, then we know there is something wrong in the path of low level inputs. If it does not, then we know it has to do with either the connection terminal or something further inside.
You can open your amp and check the solder at all the pin contacts in and around the inputs. If they appear to look stable and sound (no breakage or cracks) start looking at the circuit boards for tall tale signs of anything burnt. If you know haw to use a multi-meter, I would suggest using it and start at one end and check everything. Even though they may not look damaged, a resistor can become bad. If the Capasitors are bad, there will most likely be some spillage coming from it. Becareful and unless you have done repair work before. Don't attempt to replace it. If you put it in wrong and get a reverse charge, it could/will explode.
Aside from that, I don't know what else to tell you. Hope it helps.

Posted on Mar 21, 2009

  • 17 Answers

SOURCE: Clestion S10 Sub not working

Instead of connecting it to the sub output, try it on the L or R output of your amp.
This will eliminate the Denon.
If this fails, you need to test the loudspeaker driver unit whilst disconnected from the sub amp. Use a 1.5v cell (AA or bigger) connect using croc leads to the speaker's terminals. If the speaker is OK, you should hear a click. If you hear nothing, the speaker unit is faulty.

Posted on May 19, 2010

  • 2 Answers

SOURCE: my kef psw 2150 sub

is probably faulty capacitors
you should check out this link: http://lug.demon.co.uk/kefrepair/?cat=1

Posted on Dec 05, 2010

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My powered subwoofer no longer works through the receiver


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When my KEF home theatre subwoofer is maxing out on bass, it often makes a loud popping noise. Should I be making some adjustments to reverb, volume, or something else?


Hi,
Yes you should make adjustments.KEF makes very good products, however if you don't handle this you will have to replace or service it.
1 If the woofer is very close to you, relocate it further away. The reason being is that the lower the frequency the larger the wave form. The lowest waveforms will become louder.
2 Adjust the high frequency cut off to be at 80Hz. This should eliminate boom. Higher Sub frequency tend to muddy the sound.
3 The sub should have a subtle effect in music. So the relationship between it and the speakers it augments the sound of should be seamless.
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Information I find online says it an Active Subwoofer, so that introduces its own amp as a possible source of the symptom. If there is another version of this model that's passive, all the more reason to believe the amp is the problem because passive speakers don't spontaneously emit sounds.

If there was a physical reason for the crackling I would think more power would make it worse or blow it up.

A poor sub signal cable connection might explain low current anomalies if random noises are entering the signal path.

Make sure the signal, speaker and power cables are not aligned parallel and close to each other.

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1 Answer

OVERLOAD


First of all the KEF is a powered sub which means that it wants a line level signal NOT a speaker level. Send the signal from a tape output or pre-amp output to the sub input. The overload is because the impedence load for the speaker output is too low and looks like a short to the amp. Continued attempts to connect the system as described will result in damage to the output section of the amp.

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"cracking" noise


Your subwoofer is not capable of playing as loud as you want it to. That sound is the woofer reaching its limit. If you have any bass tone setting on your receiver set them to flat. If there are any other bass settings i.e contour, loudness boost etc turn them off. You can also try putting the woofer into a corner. This will increase the output. Closer to you would also be louder. Otherwise you need a sub with more output. Don't let the power rating fool you when you get a new one.

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