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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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  • kip_morris2 Dec 06, 2008

    I have the same problem on a brand new PS-1200 speaker. (Yes, older model, but was never opened.) It makes this humming noise even if you disconnect the wires so I do not think shielding is the issue. Unless the power in the walls is causing this there is just nothing else it could be in terms of interference.

  • kip_morris2 Dec 07, 2008

    Wanted to add that I've tried various outlets in my home with the subwoofer always as far from the wall/potential interference as possible. It hums no matter what room it is in, upstairs or down. The only trick is that I have to "trip" it to "On" due to the Auto On feature, but then I can even disconnect the source so the speaker remains on with no wires whatsoever nearby except the power cord. The hum isn't loud enough to notice during the daytime use, but it will drive me nuts at night.

  • kip_morris2 Dec 07, 2008

    Also, the power cord is two-prong, so please don't suggest it is a ground loop issue. Did I get a new sub with a bad transformer? Is this hum that common?

  • conanb Dec 15, 2008

    My sub has a similar problem, except the noise is very loud.

  • Al Jacobson
    Al Jacobson Dec 26, 2008

    I have a 15 year old Cerwin Vega sub -150 with 15" speaker. It's worked perfectly until last week. Now I get a loud hum even with no speakers connected. If I switch it from ON to Auto, the hum continues for about 15 seconds, then gets quieter. It only disappears completely if I pull the plug. Could it be a transformer? Are replacement parts available?




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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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