Question about JBL SCS125A System

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Clicking noise from subwoofer

Shortly after turning on the power to the subwoofer, whether in the "auto" or "on" mode, I get an intermittent clicking noise coming from the area of the power switch. I have tried plugging the subwoofer into different outlets, but have had the same result. Any easy fix?

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Re: clicking noise from subwoofer

Malfunction in the amp or to high signal on the input protect relay is cliping

Posted on Mar 23, 2008

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I would check the caps on the power supply. They are rather large electrolytic capacitors that will look like they burst and/or leaking. When these die, the caps ground and the sub will make a loud buzzing sound. If you are handy with a soldering iron you can replace them yourself. Replace them with the same voltage or a little bigger and same with the size.

If the cap. says 16v 4700pF on it, for example, a 20v 5300pF or a 16v 6200mF cap. will work for this application.




Jan 05, 2016 | Speakers & Subwoofers

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My subwoofer will not wake up, regardless of whether I flip the switch from Auto to On or not. Suggestions?

The sub settings for testing should be: Crossover frequency - Max; Volume - Mid; Phase - Normal.

As a quick test, unplug the sub cab from the amplifier/receiver end. Switch on the sub and turn the volume down all the way. Briefly put your finger across to short the RCA/phono tip and ring. The sub should make a buzzing sound. You now know that the sub is working and the cable appears to be okay or not.

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Power Mode (rear-panel): This switch can be set to either On, Off, Auto. If the switch is in the Off position, the subwoofer will not power up. If the switch is in the On position, it will constantly remain on. If the switch is set to the Auto position, when a signal is present the subwoofer will turn on and will automatically turn off several minutes after a signal is no longer present.

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S8 makes a very loud vibrating buzzing noise with only the power lead plugged in

Check for ground loops. Also shut off any CFL or LED lamps inthe vicinity.

You may also have an intermittent connection on the input.

There is a lesser chance that there is an internal failure of a capacitor on the amp power supply, but it is a possibility to look at if all the wiring is in place and soundly connected. The S8 has a high gain amp. It will pick up interference from CCFL or LED ballasting supplies it will also be able to pick up other switch mode power supplies. in vicinity of the input cable.

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Disconnect the input. Does it stop? If yes...

It sounds like it's sensing a signal at its turn-on threshold. Figure out why there's signal present when it shouldn't be there.

Exactly how is it connected to the source? LFE-only or full-range signal?

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I had the same chirping issue with the sub. I found a document that talks about replacing the C5 capacitor for a 47mfd type instead of 470mfd. This solved the chirping issue however I still experience an intermittend issue with the power on indicator flickering off and on. Anyone hear of the fix for this?

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Hi I am afraid it sounds like exactly the same problem I had, Namely the PSU(power suplly unit) is failing, This is a common fault (by reading loads of forums) I contacted KEF today about mine and they say the probably wont be able to source any more spares(due to so many having thuis problem no doubt) So I would suggest contacting the people you bought it from,Under the consumer protection act you should expect an electrical item to "Last a reasonable amount of time" .Mine is 3 years old and I do not consider this to be a long period so kick up and you should be entitled to a repair or at worst a partial refund.Look here basically the same Sub.

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For the "auto on" problem.

These will sound very basic, please go with it.

On your signal source, make sure you have the sub set to on.
If you can adjust the output setting on your source, turn this up.
Adjust the volume setting on the sub lower to mach the volume of the main speakers.
You may need to make these adjustments a few times to get them working.

On the hum and noise problem

Check your power outlet for the sub, make sure the polarity is correct. I have found this to not always be right. Also what is on that same circuit. Things like the fridge can cause a lot of noise on the power line. Next check your connecting cables, are they of good quality? Are they running next to anything that may cause interference? Also check you connections to the signal source. Cable and dishes are known for ground problems.

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have the power supply check out you have an open connection on your regulayor.that clicking sound comes from the relay.good luck

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