Question about Altec Lansing VS3251 Speaker

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Powered sub i have a powered sub and home audio that when i plug the power in the speakers make a loud noise a noise that gets louder if you leave plugged in what can i do to fix it not the speakers below it is an altec lansing a3965

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Re: powered sub

Thats sounds like feedback. try giving your sattelites spacings. if they are near to each other, try to put them far from each other.

try also to turn of your microphone. that might work.

Posted on Jan 14, 2008

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4 Answers

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.




Jan 05, 2016 | Speakers & Subwoofers

1 Answer

I have an older JBL TLX PS10 sub woofer but hardly used. I get a green light when plugged in. However, the speak makes a loud continuous noise when I plug in the Y connector to the low level input. It...

Just touch your fingertip to the input connector on the sub -- similar noise? That would be its amp picking up the hum of the room through your antenna-like body. IF that is the same noise, you need to make sure your input cable is shielded and connected at both ends BEFORE applying power to the electronics at either end.

Be mindful of electronic noise sources such as track lighting, UV lights, motors, TV's, etc, and route the signal and power cables well away from them.

Try reversing the orientation of the AC plug at the sub and see if that helps out.

Feb 10, 2011 | JBL TLX PS10 Speaker

1 Answer

Making loud humming noise only.but if you plug

If I understand this correctly: with NO input or cable attached it hums; with an RCA cable attached it works. (What does 'some' mean in this regard?)

You say that connecting the RCA cable improves its sound. That tells me you're supplying a ground through the RCA cable for stray voltage in the sub.

It seems there may be a basic power issue if it hums with no input. Sometimes a given power source in a home may be wired differently than others or may insufficient grounding, which can result in hum. Try reversing the sub's power plug or move it somewhere else.

Since the sub contains its own electronics it is also susceptible to strong external magnetic fields. Keep it and any signal cables leading to it some distance away from other electrical devices like TV's.

Apr 08, 2010 | Velodyne CT-100 Speaker

1 Answer

Loud buzzing from Kef PSW1000 Subwoofer

yes. A good idea. Kill power to the sub, then unplug and remove everything from the sub. go ahead and plug it in again and check for buzzzz.
That is test one. if you have buzz still, its the sub assembly. bad luck, but not impossible. If the buzz is gone its one of the signals to the sub. They can produce a buzzz without any signal coming from your stereo equipment. Replace the feed line, enjoy! BTW...Kef sure does sound clean. good choice.

Nov 09, 2009 | KEF Audio PSW 1000 Subwoofer

1 Answer

HUM noise at PSW3000 if i connect the Yamaha RX-V995

the conections some where are dirty you need to unplug everything clean all connections and the hum will go away

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It sounds like a power supply failure. It needs to go to a repair shop.

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Alesis M1 MKII bass ports

if desiring loud bass, keep port open. It is designed to be that way. If subs are in a corner, face the wall to change the wavelength and port noise wont be as evident.

Dec 23, 2008 | Alesis M1-Active MkII Main / Stereo...

1 Answer

Infinity ps-10 powers up but no boom

Try hooking up a different signal input to your powered sub, another stereo or even a dvd players audio output to the sub will work for a test. Just make sure the subs gain is down before starting. If it still not producing sound, the subwoofers amplifier is bad. I hope this helps.

Oct 10, 2008 | Infinity PS-10 Subwoofer

2 Answers

Sunfire Subwoofer 110 Noise on input plugin

A few more questions-
Does the sub hum without anything plugged into it except for power? If it makes a real loud hum almost a squeal then I think the rca cable between the receiver and the sub is dead shorted and needs to be replaced. If it's more of a low level hum, then it's a ground hum caused by many things, ie........the receiver and the sub being on different power circuits in the house.......sometimes diconnecting the cable tv feed as it enters the room while the sub is connected and humming to see if it stops........the easy fix sometimes is using a 3 to 2 prong ac adapter but lifting the ground on such a powerful amp could be a fire hazard.

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1 Answer

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Sounds like a ground loop issue. Try plugging your sub, and the rest of your entertainment equipment into the same outlet with an extension strip (4 plug adaptor). If there is too much stuff to plug into one strip, experiment with combinations and hopefully you will find which piece of gear is the culprit.

Aug 28, 2007 | Cambridge Soundworks BassCube 12 Speaker

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