Question Help with anti mode 8033 I bought from classified

Discussion in 'Home Cinema Speakers' started by kopmjj, Jan 5, 2017.

  1. kopmjj

    kopmjj
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    hi I bought a anti mode 8033 from here, but I'm not sure if it's working correct or if I set it up wrong, the problem is as soon as I turn the power on my sub starts vibrating a lot along with humming noise, I tried calibrating it after the calibration it's still the same.

    My connection is from sub out of avr to line in , from 0 phase out of anti mode to subwoofer is that correct?
     
  2. Jase

    Jase
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    Connection is correct. If you unplug the AVR and only have the Sub connected to the Anti-Mode does it still hum?
     
  3. kopmjj

    kopmjj
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    No it doesn't but once I connect the avr to line in that's when it starts humming and vibrating
     
  4. stewjoy

    stewjoy
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    Have you turned sub down? Before doing a measurement you need to turn it low as the test tones will be very loud.
     
  5. kopmjj

    kopmjj
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    The sub is at 11 o'clock , my main concern is is this normal for the sub to vibrate like this without sending any signal, this only happens when I connect the sub out on avr to anti mode , I will buy another sub cable to see if this is the issue
     
  6. Jase

    Jase
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    Wouldn't say it's normal as my Sub is silent when connected to my AVR and Anti-Mode. Another cable is certainly worth trying just in case it's that.

    If you connect directly to your Sub with the existing cable and bypass the Anti-Mode completely does it still hum?
     
  7. stewjoy

    stewjoy
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    Sorry can't help, all I know is I had mine a lot lower than that, I had mine at about 10 o'clock after anti mode measurement for the receiver to do its measurements. All I can sudgest is turn it lower and see if it still does it. Also give Tom a ring at BK electrics. He sells them along with his subwoofers.
     
  8. Deleted member 598831

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    As Jase said. Try a new cable, as your now using 2 rca, where as before only the one......could be the second cable?
     
  9. Violator

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    When you say 'turn the power on' what are you referring to? As I recall, with the Antimode you turn it on first, then the sub. Turning off turn the sub off first, then the antimode otherwise you get an almighty clunk out of it. Dunno if this is similar to what you have.
     
  10. kopmjj

    kopmjj
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    hi i will try your way as my sub is always on and i turned on the antimode and the vibration started, lets see if your suggestion helps, i have also ordered a cable as one was low quality so could be that.

    when i press bypass it gets louder the humming etc.
     
  11. aliencinema

    aliencinema
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    Hi mate
    Try turning the sub level down on the amp
    I had to do this. Then turned the sub up to compensate
     
  12. youngsyp

    youngsyp
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    This ^.

    Unfortunately, the Anti-mode is now amplifying noise that's induced somewhere in your audio chain. I had the same issue with the 8033S-II I'm using between my Arcam Solo Bar and Arcam Solo Sub.

    Other things you can try are:
    1. Setting the crossover on the sub. This won't work if you're using the sub's LFE input (it bypasses the onboard crossover) so you'll need to use the sub's Line input instead. Or change the input from LFE to Line if it's switchable. This is what I did to fix my instance of the issue.
    2. Plug the sub's power plug into the same wall socket as the AVR is plugged into. You may have a ground loop that the Anti-mode is now amplifying.
    3. If it is a ground loop, I've read changing subwoofer RCA cables can eliminate it but haven't tried it. Essentially, you're looking for a decent quality double shielded sub cable.
    Paul
     
  13. kopmjj

    kopmjj
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    Hi just to update I bought 2 double shielded sub cable and it now works, thanks for your help guys
     
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  14. stewjoy

    stewjoy
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    Great, it's nice when help can sort issues out.
     
  15. youngsyp

    youngsyp
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    Out of interest, which cable did you buy?

    Paul
     
  16. kopmjj

    kopmjj
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    It's called primeware 1m hq cable from Amazon,

    Can I ask what does the low pass and high pass do if I select them?

    Also the subwoofer volume seems a bit lower than usual , is it ok to boost the sub in the avr?
     
  17. youngsyp

    youngsyp
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    Great thanks. The reason I ask is that I have some low level 'hum' (more like a pulse) on my Arcam Solo Sub and the next port of call is the cable.

    Low pass filters allow through any frequencies below what the filter is set to. If you're going to play with this one (on the subwoofer I assume?) set it to 100Hz to start with and see how it sounds. The sub manufacturer would typically give a recommended setting for this, so that may be worth checking.

    High pass filters allow through any frequencies above what the filter is set to. For the purposes of the subwoofer, these would be used for 'subsonic' purposes to filter any low frequencies that could damage the subwoofer. If you have a sealed subwoofer, leave this off. If the subwoofer is ported, set it at 20Hz to begin with. Again, the sub manufacturer may have a recommendation for this setting.

    It's typical for the output to seem lower once the Anti-mode has run it's process. So adjusting the volume on the subwoofer, to get to a level you're happy with, is advisable. I'd leave the AVR set to 0.0dB and do all the adjustment on the subwoofer amp.

    Let us know how you get on.

    Paul

    ETA: I've just bought one of those Primewire cables, this one. Fingers crossed!
     
    Last edited: Jan 6, 2017

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