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  1. #1
    Forum Regular
    Join Date
    Jan 2007

    getting hum sound from sub

    As I said in the previous post, I'm getting a hum from the subwoofer (I have a Polk 5.1 speaker system) and it's just loud enough to drive me bananas. No, the power cord does not have 3 prongs.. only 2 so I don't think it's a "ground" issue. I tried taking the power cord out of the surge protector that everything else is plugged into and plugged it into the wall directly (just as a test) and the hum still could be heard. There's only one cable plugged into the back of the sub - a high quality sub cable that goes into the back of the receiver. However, even if I pull this cable out, the hum can still be heard so I know it's a power thing. I don't think I necessarily have a bad sub as I've heard this is a very common problem. My sub does have 3 settings (on, off, and standby) but I'm trying to figure out how to get the sub to power off and on with my receiver (see other post) :-) Of course there was no manual that came with my Polk speakers and a lot of what is written in my Yamaha receiver manual goes over my head. Right now I'm just manually hitting the switch on the back of my sub to turn it on everytime I wanna use the stereo... but I know that's gonna get old quick. Can anyone help?

  2. #2
    Forum Regular likeitloud's Avatar
    Join Date
    May 2006
    San Francisco Ca
    Run the cable through a RF filter, Ebtech "Hum Buster" or Clean Box(forget the company).
    That plate amp may also be on its last legs. Later.
    Sunfire TGP-5 Pre/Pro
    Carver A760-x
    Carver TFM25
    Carver TFM15 x 2
    Sunfire Signature "True Sub"
    JBL Studio L890(Front)
    JBL Studio L830(Rear)
    Infinity PC350(Center)
    Oppo Digital 983H
    Panasonic Viera TH-46PZ85U
    Panasonic DMP-BD50 Blu-ray Player
    Power Protection/Filters-Monster HTS 5100 MKII
    Canare Interconnects

  3. #3
    Crank it up, dude! huh? hydroman's Avatar
    Join Date
    Jan 2007
    Chesapeake Beach MD
    Mine as well. It is a Denon. I (wrongly) use the switched outlet on the H/K reciever. It is tolerable.
    H/K AVR635 7.1
    Denon DVD900
    AE AEGIS III Mains
    ION USB Turntable w/ Shure M97XE
    15" Titanic III Sealed Enclosure Sub
    Dayton Rackmount 1000W :O
    Denon Surrounds
    Sony Bravia KDL40S2000

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