(Topic ID: 224688)

Improving sys11 sounds


By Tuukka

8 months ago



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  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 8 months ago by wayout440
  • Topic is favorited by 1 Pinsider

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    wiring-early (resized).png
    BKaudio2 (resized).jpg
    sys11res (resized).jpg
    sys11lpf (resized).jpg

    #1 8 months ago

    In system 11, the cabinet and backbox speakers are connected in parallel. The small backbox speakers have very limited frequency range at lower end, while the cabinet speaker could reproduce much better bass. But if you crank up the volume, the backbox speakers usually sound too loud.

    Making the cabinet speaker response only to bass frequencies, and reducing power to backbox speakers results in nice deep sound. This is accomplished by inserting a low-pass filter in one of the cabinet speaker leads - I used an old score unit coil, probably a 23-800 or similar would also work. For the backbox speakers, I inserted a 27 ohm resistor to speaker feed. When doing this, you have to check out which of the yellow/black wires on the left speaker goes to sound board and which goes to the right backbox speaker. Keep the speakers connected together and put the resistor to the wire coming from the soundboard.

    Of course you may experiment with different low pass filter coil and resistor values. Cabinet speaker low pass filter can be tuned by inserting a discarded coil plunger partially inside the coil. The more it is in, the lower is the filter frequency.

    sys11lpf (resized).jpgsys11res (resized).jpg
    #2 8 months ago

    or you could do this...

    BKaudio2 (resized).jpg
    #3 8 months ago
    Quoted from Tuukka:

    In system 11, the cabinet and backbox speakers are connected in parallel. The small backbox speakers have very limited frequency range at lower end, while the cabinet speaker could reproduce much better bass. But if you crank up the volume, the backbox speakers usually sound too loud.
    Making the cabinet speaker response only to bass frequencies, and reducing power to backbox speakers results in nice deep sound. This is accomplished by inserting a low-pass filter in one of the cabinet speaker leads - I used an old score unit coil, probably a 23-800 or similar would also work. For the backbox speakers, I inserted a 27 ohm resistor to speaker feed. When doing this, you have to check out which of the yellow/black wires on the left speaker goes to sound board and which goes to the right backbox speaker. Keep the speakers connected together and put the resistor to the wire coming from the soundboard.
    Of course you may experiment with different low pass filter coil and resistor values. Cabinet speaker low pass filter can be tuned by inserting a discarded coil plunger partially inside the coil. The more it is in, the lower is the filter frequency.[quoted image][quoted image]

    Isn't that what Williams did with Funhouse? Now a system 11 can have that annoying super loud thump whenever you turn it on and off.

    #4 8 months ago
    Quoted from KenLayton:Isn't that what Williams did with Funhouse? Now a system 11 can have that annoying super loud thump whenever you turn it on and off.

    The thump is power on surge from the amp, and there are a few ways to deal with it. A delay/muting mod used to be floating around out there. I have the same thing on my FT, but it doesn't bother me.

    The speaker wiring on FH

    wiring-early (resized).png
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