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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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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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 | Audio Players & Recorders

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Benwin 5.1 surround sound system Humming loudly without anything pluged into it!!!

It is sad your having a problem with your
Benwin 5.1 surround sound system
If humming can be heard on all speakers, then it could probably

be on the power supply.

If it is only on the main SUB unit, then it could be the amp itself.

But check for power supply capacitors that supplies voltages to the

amps.Check for amp output DC voltages too.

Oct 04, 2012 | Audio Players & Recorders

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When I play a CD I get a buzzing sound. The sound starts as soon as I hit the play button (and before the CD is actually moving.) It gets louder once the CD starts playing. The sound is coming through...

Buzzing is usally AC line noise leaking into an un-shielded cable somewhere or a floating ground. If the AC plug is reversible, try that. Sometimes the buzz is from an attached device. Make sure all audio cables are plugged in tightly at each end and routed away from or at right angles to any power cords and away from other sources of strong magnetic fields like TV's. I've also seen variable track lights induce noise but it's usually minor.

Mar 19, 2011 | Teac MC-DX20B CD Shelf System

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Two speakers hum noise

Very doubtful that hum issue is ground potential difference from multiple power outlets as power cord is not grounding type (it is transformer isolated). I do agree that it is good practice to connect all audio equipment to common power strip though, especially with pro sound. Check the audio cords connecting your speakers to the coumputer sound card: 1) Make sure they are connected to the correct jacks and plugged in all the way, 2) wipe the connectors off with a clean paper towel wetted with a smidge of WD-40, 3) replace cords if all else fails. I have also seen solder joints fail on the power supply capacitors (due to vibration) causing hum -- but leave this repair to an electronics technician due to dangerous voltages.

Sep 25, 2010 | Altec Lansing AVS 500 Computer Speakers

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

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My door speakers arent working but my sub is and when i turn on my car a noise comes on from the sub and it gets louder if i step on the gas. it wusnt doing that until i unpluged the power cable from the...

the RFI suppression is gone... It is normally a small capacitor that conducts the AC noise from the ignition to ground.

You probably "popped" the coil on the speakers - or atleast the pass through coil on the subwoofer.

Remember, your sub take all the audio, filters out the high stuff and amplifies the low freqs.... the high stuff is passed onto the other speakers....
if you have distroyed the pass through coil - speakers don't work...
First, try connecting the speakers directly. (leave the sub out of the system)... do they work? If yes, then the pass through on the sub is shot and must be replaced before any further troubleshooting can be done.


Oct 23, 2009 | Car Audio & Video

1 Answer

Sub not very loud

Hey buddy your question caught my eye because i have a buddy that was wondering the same thing not so long ago-and im no expert but i have had my run with rockford fosgate amps and a few sonys as well. So first of all if you know fosgates well you know that they ALL put out more power than what they are rated at -example your 400 watt fosgate amp is rated at 400 watts but if you got it new than it came with a birth sheet that shows you how much its really putting out-im just throwing a number out there but its probably closer to 480 actual watts. Now you get the sony amp and it says its a 1000 watts but its all bs -it actually is rated at 400 continous usable watts- so the reason that its not any louder than the fosgate is because you bought an amp with almost identical power output. The other part of the problem is that you are limited by your speaker-you could buy an amp that actually puts out 1,200 watts and plug it right in to your sub and its going to probably blow within 30 seconds or quite possibly catch fire. The numbers when dealing with car audio that you have to pay attention to are the R.M.S. power ratings - never look at the peak or max wattage because its all bs and yea its all bs- As i was saying you are going to be limited by your sub because as it stands right now you cant put much more power on that thing without blowing or roasting the coil. All subs have a limiting factor as to how much air they can move- this is called X-MAX and that tells you how far the speaker cone actually moves from start to peak excursion- once you have supplied the speaker with enough power to reach its x-max then thats it -no matter how much power you put on it it wont move any more air than that-and you will create heat and distortion if you try and thats just begging for a blown sub. If you want it louder than upgrade your sub to something that will move some serious air like a jl audio w7 or orion hcca subs -those subs can get it on like dammmmm or easier than that get another sub and then your moving twice as much air at a fourth of the price of buying a balls out jl w7-anyhow good luck with that

Apr 06, 2009 | Sony Xplod XM-1652Z Car Audio Amplifier

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Speakers Won't Get Loud HELP???


Dec 07, 2008 | Audio Players & Recorders

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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.

Sep 25, 2008 | Sunfire True Sub MK II Subwoofer

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