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  1. #1

    Member Sales Rating: (0)

    Join Date
    Oct 2009

    Default Subwoofer rumbles non-stop when on?

    Hey guys. Audio noob here. Set up my system a little while ago and it was working fine. I have the Polk Audio RM6750 5.1 Home Theater Speaker System connected to an Onkyo TXSR706B receiver.

    Initially, my set up was working just fine, but the subwoofer would be really touchy. If I adjusted it on the floor, it would start to hum, loudly, until I disconected the wires to the reciever and reset the power (at least this is how I think I got it to stop humming). Now it's doing it again, when ever I power it on, it just hums full blast whether a movie is playing or not.

    I thought I remembered reading somewhere in the manuals that the receiver or the subwoofer had to be had to be unplugged before the connections were made. For the life of me, though, I can't figure out out to troubleshoot this.

    For the record I have it connected to a single sub out cable with a splitter on the end where it connects to the subwoofer.

    Any suggestions? Thanks so much, guys.

  2. #2

    Member Sales Rating: (26)

    Join Date
    Jun 2009
    Salinas, CA


    You could try just running that sub cable to the left rca input on your sub. That or you can try a different cable since I think the cable itself is shorting somewhere causing the sub to hum/play uncontrollably. I can test that out by disconnecting the sub cable on the preamp end and touching both the pin and outer collar with my finger or so and the sub will do just as you say yours is doing now.

    Btw, Welcome to CP!

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  3. #3

    Member Sales Rating: (7)

    Join Date
    Aug 2004
    Central Illinois


    sounds like a ground loop. Try to use a 3-prong to 2-prong adapter on the power cord of the sub and see if that resolves the issue. (if the sub already has a 2prong power cord - try it on the receiver.)

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  4. #4

    Member Sales Rating: (1)

    Join Date
    Dec 2008
    Pittsburgh PA


    Quote Originally Posted by McLoki View Post
    sounds like a ground loop. Try to use a 3-prong to 2-prong adapter on the power cord of the sub and see if that resolves the issue. (if the sub already has a 2prong power cord - try it on the receiver.)


    I agree with you that it could be a ground loop issue or dirty power.
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  5. #5

    Member Sales Rating: (13)

    Join Date
    Apr 2006
    Ashland, Oregon


    I had problems when I tried using a splitter with my sub- I took the splitter out and problem solved.

  6. #6

    Member Sales Rating: (0)

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    Oct 2003


    I also split my sub and had similar interference

  7. #7

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    Oct 2009


    My PSW110 hums when I turn sub volume to MAX, even with no audio input

  8. #8

    Member Sales Rating: (3)

    Join Date
    Oct 2004


    This site has an awesome search feature.

    The problem could be coming form a few different places.

    A cheater plug works, but there is a reason why they call them a cheater plug.

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    Hang around there is a lot to learn on the forum pages here.

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