Subwoofer hum/buzz when bluray is off

Discussion in 'Subwoofers' started by Serge, Jan 8, 2017.

  1. Serge Audiophyte

    Serge
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    Hi all

    I just got an old JVC subwoofer SXPW860 that works great BUT the problem is that when I connect the speaker wire to the white rca plug it starts to hum/buzz when my bluray is off but the moment that I turn on my bluray the hum/buz stops no hum or buzz whatsoever. Could this be a ground loop? The sub doesn't have an on/off switch so it just stays on because of the hum/buzz (like there's still a signal in the speaker wire even though the bluray is off). So today I will try to plug the same power plug to the same bluray plug and see if this ground loop goes away.

    The sub doesn't have any speaker terminals as input it only has rca as input and I'm using the white (mono) input to connect the speaker wire from my bluray. My bluray is an LG home theatre with built in audio amplifier and it's all speaker terminals no rca outputs and no dedicated subwoofer rca output.

    Any help with this would be welcomed!!!!!

    THANKS!!!
  2. HTfreak2004 Enthusiast

    HTfreak2004
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    Does the blue ray player support mono?


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  3. j_garcia Audioholic Jedi

    j_garcia
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    It won't work that way because the signal level is not correct to go directly from the player to the sub. There will be no volume control. You either need to upgrade your HTiB to a real receiver or get a sub that has speaker level inputs. Given those two choices, you'll benefit more from a real receiver. It does sound like ground loop.
    • Agree Agree x 1
  4. Serge Audiophyte

    Serge
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    Hi all sorry for been late to answer!! Ok HTf it HAS a subwoofer output (like all other speakers) but all speakers are terminal no RCA output just bare cable for all 5:1 set of speakers. So no dedicated RCA subwoofer output (to put a good cable).

    j_gar; You can control all speaker levels in the menu to setup your 5:1 and no speaker inputs as you said. But the thing is that I had another JVC sub (6" I think) with the same setup as the one that I have now and it didn't do any hum or buzz even though I have added an RCA end to the speaker cable to plug in the back of the sub as I did with the one that I have now. Maybe a bad rca plug, bad sub rca ground??? Hmmm...

    I have tried the connect both power connectors to the same power bar but still no help here so…..

    Thanks for all the help guys!!!
  5. HTfreak2004 Enthusiast

    HTfreak2004
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    I have a Samsung sub that has hdmi input from source component then hdmi output for HD Tv then the sound bar connects to the sub for dialog. You said you have an rca output on a sub.? The sub can act as a hub between a source component and a display for example but it must have an input to receive source audio material from a component that outputs audio. You can't output a sub to a blue ray player input. I haven't seen a blue ray player with an input for audio before though so this is news to me. You need an input signal to the sub. The output sounds like it is meant to connects a sound bar or other external speaker.


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  6. j_garcia Audioholic Jedi

    j_garcia
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    Subs that come in systems that are designed for that will have that sort of feature. More or less all stand alone subs do not have this.


    I was just going to mention that - try another RCA cable. My guess based on this is that it is the cable. In the setup that is a calibration level, not a true volume adjustment, but I understand. What I meant by it is that when you adjust the system level, the sub will not adjust with it; it will be constant.

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