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Loud humming noise from subwoofer

When I turn the sub on it makes this loud humming like noise, all other speakers work fine, I opened the sub up and everything seems fine, nothing blown, any ideas? I have a Harmon Kardon HKTS14 subwoofer with the same problem, although I also sometimes get a screeching "fax" like sound from it as well. I am using the original cables to connect from the receiver (AS630), which are color coded purple. Should I try new cables, since these should be shielded? JE

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SOURCE: Loud humming noise from subwoofer

if it is a powered sub you should lift the ground. you can do this by adding a three prong to two prong adapter. you know, like when you go to plug something in and the cord your plugging in has three prongs and the outlet your plugging in to only has two. it doesn't have the hole for the ground so you go get a little grey adapter that has three holes on one side and two prongs or tabs on the other.if that doesn't take the hum out (actually, is keeping the hum from getting in) you have a problem with the amplifier.

Posted on Jan 27, 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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How to Stop a Subwoofer Hum - HowStuffWorks
Would you like to learn how to stop your subwoofer from making a consistent low-frequent hum or buzz? Read this article to learn how to stop a subwoofer hum.

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My acoustic research hd510 has a loud humming noise

check your audio line in connection, either L or R signal line floating may also cause humming noise. Sub woofer usually very sensitive. If your audio input not connected, do you still hear humming noise? in actual you should not hear such noise, unless volume at max then it is possible to hear little.

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Subwoofer makes loud hum noise

4 possibilities:
1) ground loop or open connection on input.
2) close proximity to a CFL, or other flourescent fixture.
3) bad filter caps in the sub.
4) bad coax to the sub.

in any event, check wire routing. You can also track down the noise sources by using a portable AM radio tuned off station. it will pick all manner of RF noise around the house. Light dimmers are notorius noise makers.

Dec 20, 2011 | Speakers & Subwoofers

1 Answer

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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.

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You can go buy a audioquest SUB-X subwoofer cable with a additional ground wire on it an connect the ground cable to the ground slot of the receiver an the other end to a screw on the sub or into one of the high output terminals on the woofer if it has them an this will take that humming sound right away but the cable is around $90

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Sound like a component inside the sub is overheating. Most likely will need to be replaced.

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The circuit that should be turning the sub on and off based upon the presence of an audio signal is not working correctly and the sub is trying to reproduce 60 cycle hum. The unit needs service.

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Cerwin Vega ve-28s subwoofer and new Cervin Vega 2-way satellites

I bought my VE-28s and it did exactly that crackled, cerwin replaced part in amp but few months later problem persisted. they then replaced entire amp assembly and its been fine. i really push it to and its been fine. to test it, unplug the connection from amp/ reciever and see if it persists. if so its the sub, if not its the amp/ reciever. dont dump it, these subs really crank and can put out some deep loud bass.

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Loud hum on subwoofer.

try another speaker on that channel if you get no sound or it hums then it is time to take your set to a tech your audio out put on that side is damage along with some caps.good luck.

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