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    Moderated By: Toli
    Agoraquest Forum Index Getting Started/Building a Home Theater
      
    sawm500 noise Dashboard
    Replies: 2 | Views: 1,125
    Last Reply: February 4, 2006, 11:15 pm

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    Author sawm500 noise
    kupgas

    Rank: Sony Fan


    Joined: Feb 04, 2006
    Posts: 1
    From:

      Posted: 2006-02-04 13:29

    Howdy,

    I've installed this sub with a pre amp out from my receiver. The sub produces good sound, but it has a hum.....as soon as the unit is powered up and does not increase in volume with an increase in the sub volume. The manual mentions this, but it's inside a cabinet and I can still hear it. Sounds like a ground loop. Kinda bugs me.



    Any suggestions would be appreciated.





    -----------------
    kupgas

    [ This message was edited by: kupgas on 2006-02-04 13:30 ]


       


    jehill
    Premium Member

    Rank: Sony Senior Advisor


    Joined: Mar 13, 2003
    Posts: 14278
    From: Sewell, NJ

      Posted: 2006-02-04 15:44



    Welcome to Agoraquest!  You're right, it does sound like a ground loop.  From the schematic, I see that the sub doesn't have a three prong plug.  Therefore, its ground reference is that of your receiver's preamp output.  Tell us more about your receiver.  What is the make and model number?  Does it have a two or three prong plug?  Do any of the components in your system have a three prong plug?  If so, which ones?  Another possibility is that the cable from your receiver's preamp output passes through a strong magnetic field, such as that produced by a power transformer.  If so, the cable routing might make a difference.

    -----------------
    -John

    Sony A/V System: KDL-55XBR8, BDP-S550 and AVD-LA2500PKG, consisting of AVD-C70ES Super Audio CD/DVD Receiver, 4 SS-LA500ED surround speakers, 1 SS-LAC505ED center channel speaker and 1 SA-WD200 Active Subwoofer


       
    Craig_Nike

    Rank: Ultimate Sony Reviewer


    Joined: Apr 05, 2002
    Posts: 2262
    From: Australia

      Posted: 2006-02-04 23:15

    John is usually right, but just in case I have suffered from a continuos droning noise before from a poor cable. I replaced the cable and nothing else and it was perfect, try this as a 2nd option.



    -----------------
    This is the last thing I need for my HT - now i'm finished!

    AVR: STR-DA9000ES & STR-DA5300ES
    AMP: TA-N9000ES
    BLU: PS3
    DVD: 999ES & 777ES
    SPKR: SS-X70ED, SS-XCN70ED, SS-LA500ED
    SUB: SAW-X700M


         
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