Using the BFD without subsonic filter?

Discussion in 'Archived Threads 2001-2004' started by MichelF, Mar 17, 2001.

  1. MichelF

    MichelF Extra

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    Hi,
    I was worried about the lack of subsonic filter on the Behringer DSP1100P when using it for subwoofer EQ. I asked (email) Behringer why it is so and here is the answer I got from them:
    "The DSP1100P cuts off under 20 Hz. This is due to the A-D converter. So, there is no need for a separate crossover or high-pass filter."
    Would you really use it without an external subsonic filter? Did you try?
    Michel
     
  2. Deane Johnson

    Deane Johnson Supporting Actor

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    I don't use a sub-sonic filter with my 1100P and a Velodyne FSR-18 sub. Why would I want to?
    Deane
     
  3. MichelF

    MichelF Extra

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    To protect your woofer!
    Are you using the internal amp of your Velodyne sub? If yes it surely has an internal subsonic filter!
    Perhaps my question was not clear: would you use the BFD with an external amp powering directly the woofer of a sub without any subsonic filter in the signal path and rely totally on the BFD to cut everything below 20hz?
    Michel
     
  4. Deane Johnson

    Deane Johnson Supporting Actor

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    I guess my Velodyne does have an internal sub-sonic filter. There is a switch to select 35 Hz or 15 Hz. I use 15 Hz. Never thought about it before since it was all taken care of in the design. I wondered why there was concern since I had never given it a second thought, now I know.
    So far as using the BFD and depending on it to provide low frequency cut-off, I guess one has to decide whether they can count on BFD providing the right information or not. That's a tough call.
    Hopefully, Tom V. or some one with more experience in DIY subs will jump in with an answer. I guess I shouldn't even have tried to answer your question since I obviously don't know the answer.
    Deane
     
  5. MichelF

    MichelF Extra

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    Deane,
    Thanks anyway :)
    Michel
     
  6. Timmy

    Timmy Stunt Coordinator

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