Looks like I need the BFD (graph attached)

Discussion in 'Archived Threads 2001-2004' started by Christopher M, Mar 18, 2003.

  1. Christopher M

    Christopher M Stunt Coordinator

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    So, I did some tests last night. I set the volume to do 70dB on the Sub with the receiver Test tone. I then ran through the test tones on my SVS 20-39PC+

    I only ran the tones with the sub+mains on from 50Hz up. Crossover on the receiver is set at 80Hz.

    [​IMG]


    I have a really solid dip around 40Hz-45Hz. The rest below 40 Hz doesn't seem too horrible. I will be getting the BFD.

    Murdock
     
  2. ColinM

    ColinM Cinematographer

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    Did you monkey with the phase?
     
  3. Christopher M

    Christopher M Stunt Coordinator

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    No, not on that. We got it where it "sounds good" to us. We could try.
    I didn't think the phase would matter a whole lot as far as the levels go. The mains don't seem to be canceling any of it out, or boosting it more than I'd expect really.
    That Blue line is the sub all on its own, no mains at all.

    Murdock
     
  4. PaulT

    PaulT Supporting Actor

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    You may have difficulties in getting a 8-10dB Boost at the 45Hz point without using a lot of dynamic headroom.

    Read through Sonnie Parker's excellent BFD setup guide at:
    http://www.snapbug.ws/bfd.htm

    Pay close attention to the Gain section near the end of the article.
     
  5. Christopher M

    Christopher M Stunt Coordinator

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    Yea, I had read through that. I plan on trying to bring that up as much as possible without the BFD, and then cutting the other peaks down to match that one.

    Murdock
     

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