Question about Velodyne DLS-3750 Subwoofer

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Power problem hi, i'm currently receiving a 'clicking' noise followed by an intermittent power loss and then gain on my subwoofer. a little new to home theatre and any info will help. thanks.

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Re: power problem

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

Posted on Jun 04, 2007

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Klh powered subwoofer model ASW10-120B... when you plug in to power... it makes a loud buzzing/humming noise

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.




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Hi. I have problems with my SWA1801. When I try to start the amp, the Thermal light goes on. Even if the amp is cold ! What can it be? I have turned down the gain on the back and have good cables to the...

Power it ON, without anything connected to the input.

If it powers On without the thermal light, then rejoice,

If it powers On with the thermal light it means something...

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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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Hi my name is Ben. I have a Mordaunt Short home theatre system which is probably 6 yo but has had very little use. On standby mode, the 309W sub started to make a buzzing sound with intermittent louder...

It can be repaired. A transistor shorted and possibly some resistors burned open as well. This is due to an overload causing the transistor to drive hard creating heat and eventually shorting out. The transistor needs to be isolated, removed, and replaced as well as the resistors.

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Hi...i have an rxv663 yamaha receiver... when i turn on the volume from -7db to max i hear a noise from my speakers even if i dont have any input on the reciever...what can i do?

How loud? Just noticeable if you focus or could it be buried by music? I've heard of and had noise from other electical devices in room like a light dimmer. Try headphones. Make sure your signal and speaker wires aren't running near power cords or sources of high current or magnetic fields like TV's and other speakers.

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1 Answer

Subwoofer blows internal fuse when receiver is turned on

Has it ever worked?

Try this - connect one pair of its speaker wires at a time and test it. Watch the polarity.

• Make sure all cube speaker arrays are connected to the proper terminals according to their
position in your room.
• Check to be sure all wires are connected to your surround receiver with the proper polarity
(+ to + and – to – wires). Incorrect wiring can result in a total loss of module output.
• Correct any wiring problems before you plug in your receiver and turn it on.

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Well as I see from the owner manual for this device the sub is active one and my opinion is that electric is your problem.The power of the sub and main unit must be on the same phase otherwise you'll hear brrrrr or frequency of your main unit power supply on the sub.Thats why sound changes when you open or close the door.Take one power distribution cord (get power for bought devices from the same place) and connect main unit and the sub on it and then try.I hope that this will help you

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1 Answer

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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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hi, ya , some recievers have its setup where u have to enable the sub out,, check the menu carefully, also the player menu if the sub is on or off, let me know..

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