subwoofer humming :(

Discussion in 'Subwoofers' started by karrar55, Apr 24, 2013.

  1. karrar55 Audiophyte

    karrar55
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    hello everyone i have probably the weirdest way of having my home theater subwoofer fail on me. ok so i was charging my phone and someone called me so i go to answer it and as soon as i touch the phone i got a strong electric shock from it because i was charged from my carpet. when that happened my subwoofer (that is plugged to a different wall outlet near my phone charger) started humming loud. i dont know why it started humming.

    I have a samsung ps-aw730 powered subwoofer.


    what i have done so far:

    1. plugged subwoofer to different outlet. no change
    2. did a speaker test. no change
    3. opened up the SB everything seems ok. no fuses burned or anything.
    4. audio wire is good too

    if you guys can help me out in fixing my sub, that would be greatly appreciated thanks!
  2. markw Audioholic Overlord

    markw
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    Does it hum when nothing is connected to it and it's only pluged into the wall?
  3. j_garcia Audioholic Jedi

    j_garcia
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    How is it connected to the receiver? Disconnect it from the receiver and see if the hum goes away, if it does, it may be ground loop. If it doesn't, the sub is the problem. The most common cause of this IMO, is typically the CATV feed - try disconnecting that from the system and if the hum goes away, it is most likely ground loop.

    http://forums.audioholics.com/forum...ground-loops-eliminating-system-hum-buzz.html
  4. AcuDefTechGuy Audioholic Slumlord

    AcuDefTechGuy
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    If it is as disturbingly loud as I think, it's probably not ground loop, especially with absolutely nothing changed or even touched on the Audio system.

    If the sub hums very loudly with no other wires connected (except power cord), then I say the sub amp probably has malfunctioned.
    Last edited: Apr 24, 2013
  5. j_garcia Audioholic Jedi

    j_garcia
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    That's why we both asked if it hums with nothing connected. I don't think it is ground loop either, sounds like the amp.
  6. karrar55 Audiophyte

    karrar55
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    hey guys thanks for all the replies...when i plug it in without the audio wire to the electrical outlet it makes the humming noise too. my sub has a volume on it so the humming can be regulated its not a uncontrollable humming
  7. Speedskater Audioholic

    Speedskater
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    It first I thought that this was the old story about the dog barking just before the phone rang.

    Let's get to troubleshooting:

    a] Turn everything off.
    b] Unplug all the sub wires.
    c] Plug in the sub AC cord & turn only it on. Does it hum?
    d] If yes then make a shorting RCA plug by taking an old & cheap RCA interconnect, cutting it to about 6 inch length, strip off some insulation and twist the center and shield together.
    e] Turn-off the sub, insert the shorting plug and re-power the sub. Does it hum?
    f] If yes, send the sub out for repair.
  8. karrar55 Audiophyte

    karrar55
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    yes it does hum. guess i gotta get it fixed. thanks guys.
  9. TLS Guy Audioholic Overlord

    TLS Guy
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    Unfortunately your static charge blew the sub amp via the neutral line. The switching power supplies in these sub amps are prone to blow very easily. Unfortunately I doubt it is worth the cost of repair.
  10. afterlife2 Audioholic Ninja

    afterlife2
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    Don't bother getting It fixed. TLS Guy Is always on point. I'd say give us a budget/room size and we can help you get a good reliable sub.
  11. einteractive Audiophyte

    einteractive
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    A subwoofer humming can be caused of two reasons: it's either coaxial cable interference from the cable TV or satellite service provider; or a grounding problem between the sub and the audio-video receiver that drives the home theater system.
  12. markw Audioholic Overlord

    markw
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    I can think of at least one other reason.

    The amplifier died. Unfortunately, it does happen.
  13. Bizarro_Stormy Audioholics Resident Whac-A-Mole'er™

    Bizarro_Stormy
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    Well... one more reason...

    It could be bored...

    I tend to hum when I'm bored...

    that and smoke...

    If your sub starts humming AND smoking, it could be trying to tell you something...
  14. caper26 Full Audioholic

    caper26
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    First guess is something shorted on the amp.
    last thing to try is to use an extension cord with 2 prong, so that the grounding prong of your sub power cable is not connected. See if the hum is still there. I doubt it will work in your case due to the backstory. Always worth exhausting all efforts first.
    You could price out a replacement amp. I did that for my monitor audio amplifier. $1399 MSRP sub with a mild hum was fixed with a $280 plate amp.

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