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Problems Setting Filters on BFD.

Discussion in 'Archived Threads 2001-2004' started by Nelson T, Mar 30, 2002.

  1. Nelson T

    Nelson T Member

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    I can not seem to program more than 2 filters on my BFD. Once I have programmed the first 2 filters and try to set the 3rd, there seems to be no effect or change in my readings. I have read the owners manual and Sonnie's BFD Setup Guide carefully, so I am not sure what I am doing wrong.[​IMG]
    Here are my BFD readings
    As you can see my first filter is at 28Hz and my second one at 31.5Hz. I have also tried other frequencies on the first 2 filters and they seem to work fine. So I know that I have dialed on to the correct frequency for the other filters that I tried to setup that seem to have no effect.
    Nelson
     
  2. Rick Radford

    Rick Radford Well-Known Member

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    Nelson,
    Are you saying that any other filter you set has no effect? If I understand you correctly, I'm wondering about your basic setup of the BFD... ie, are you sure you're changing filters within a single preset? Or might you be changing presets? It can be confusing.. and your results tend to make me think you're changing presets when you think you're selecting another filter.
    Make sure you have one preset selected (preset 4 or 5 would be good because they are already set up as parametric). Let's say you use preset #4. Next press the filter select button (turns the LED on). Now you can select filters 1-12 from preset 4 by rotating the jog wheel. Adjust the parameters of each filter as you see fit.
    Remember that if the Filter Select LED is off, you are looking at presets.. not filters in the BFD's display. Also, the number of red LED segments illuminated tell you how many filters are active for the preset you've chosen.
    For starters, your BW is very narrow.. 1/60 octave. Are you taking all the measurements manually?
    I think I'd start at 36Hz, and try a 15/60 or 20/60 BW, -12 to -15 dB or so to start and then see what your response is before trying the next filter.
    Note: my BW calcs suck. [​IMG] .. so consider the above as a WAG.
    What I found works best for me is to run the ETF5 software and watch the effect onscreen as I adjust the filter parameters on the BFD.. in which case we don't need no stinkin' BW calculations. [​IMG]
    Also, make sure you have sufficient input levels going into the BFD. (the red clip light should just illuminate occasionally at your maximum listening level).
    brucek and Wayne P. have numerous posts around here that deal with BFD and EQ'ing... much of it since the first of this year.. so it should be current info.
    HTH.
     
  3. Nelson T

    Nelson T Member

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    Rick,

    Thanks for the quick reply!

    It seems that once I set my first two filters in preset 4 that the 3rd one I try to set up has no effect. I am changing my filters within the same preset (Preset 4).

    Yes, I have taken all my measurements manually.

     
  4. BruZZi

    BruZZi Well-Known Member

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    Why don't you try using a different preset like # 5 for example,and see if that works.
     
  5. Rick Radford

    Rick Radford Well-Known Member

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    >How would this have an effect on my readings?<

    W/r/t input levels, it shouldn't. But was just a general setup consideration.

    Hmm. Sounds like you're familiar with the difference between presets and filters... which leaves me puzzled about your problem.

    Your web page only shows 2 filters. They both have too narrow of a BW as I mentioned earlier. You have the BW listed as 1.. which equates to 1/60 octave. The range of the BFD is 1/60 to 120/60 (2 octaves).

    At 28 Hz (for example), a 10/60 (1/6 octave) BW would have outer parameters (o.p.) of 25 and 31.5 Hz. So you can imagine what a 1/60 octave filter would do (not much).

    Here are some examples that Wayne P posted in another thread:

    1/6-octave, 22Hz, -5dB. The o.p. frequencies are 20Hz and 25Hz.

    1/3-octave, 32Hz, -9dB. The o.p. frequencies are 25Hz and 40Hz.

    1/3-octave, 50Hz, +8dB. The o.p. frequencies are 40Hz and 63Hz.

    HTH.
     
  6. Tom_A

    Tom_A New Member

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    Nelson - I had the same thing happen when I first tried to use the BFD. Turned out I was setting the frequency incorrectly. Make sure when you dial in the frequency there is not a decimal point in front of the number (for example, if you were dialing for 50Hz it should look like "50" on the display not".50"). Also, the small indicator light to the right of the right of the display should read "Hz" and not "kHz". It was driving me crazy why I would not get any change in readings until I realized that I was setting a filter for 500Hz when I wanted one at 50Hz!
     
  7. Nelson T

    Nelson T Member

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