Now I need BFD help ?

Discussion in 'Subwoofers' started by karkus30, Aug 3, 2004.

  1. karkus30

    karkus30
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    Its probably been answered before....but:

    Now I own a BFD (he says with the authority of one used to handling acronymns and initialisation). I need cables (so I have asked Mr Grant for help), any thoughts. Its all about the XLRs.

    Where the do I start. Which exact sine wave freq. should I download or should I just use the VDE frequency sweep, then what?

    Also posted in SVS set up help thread
     
  2. recruit

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    Hi Karkus30,
    Try this link this should help you out, it will be alot of trial and error :eek:

    www.snapbug.ws/bfd.htm

    Loads of tweaking i think :D

    John
     
  3. eviljohn2

    eviljohn2
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    You may well be better off using the TRS connectors rather than the XLRs if that's any help. You may well introduce hum by mixing balanced and unbalanced connections.

    Havn't got one myself yet so can't help otherwise though. :)
     
  4. karkus30

    karkus30
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    Ah Ha, thanks, thats just what I needed.
     
  5. karkus30

    karkus30
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    It gives the option of wiring pins 2&3 together for unbalanced use. By TRS I think you mean the standard guitar jack plugs?

    You should buy one. Its a bargain for £90.00. Just so techie.
     
  6. eviljohn2

    eviljohn2
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    I've posted the reasoning in your thread in the cabling section which you've probably already found by now.

    I've got a bit of cash lying around at the moment despite having just ordered a Humax box. Let me know how you get on and I'll seriously consider it, I do love being techie but think I might be better off upgrading my Denon 1802 instead. Decisions :(
     
  7. simonthepieman

    simonthepieman
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    I used the jack plug like a guitar plug
    Mark Grant made me a rca to jack plug sub cables
    This is the best way,unless you are a pro user
     
  8. chrisgeary

    chrisgeary
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    yep 1/4" jack to phono plug works a treat.

    when it comes to setup, i personally find that sweeps aren't that useful, except for a final ear-test at the listening position when you are finished calibrating. if you are quick to detect a peak and trough and remember the frequency displayed on your TV at the time, then you are probably on to a reasonable start.

    what is perhaps more useful is the excel spreadsheet and then obtaining several fixed frequencies which you play one at a time and then note the SPL on your Radioshack SPL meter. The frequencies you most need are 20, 25, 32, 40, 50, 63, 71, 80hz. The spreadsheet compensates for inaccuracies in the SPL meter and gives you a rough idea of your room response at the meter's position. Yes this does take time, but its cheaper than buying real time analysis software! Most people just want to remove the larger peaks and troughs with their BFD, not get a ruler flat graph.

    might be worth giving your sweeps a try first - do get an SPL meter though, if you dont already have one, but remember that what it reads at certain frequencies is not always correct. the snapbug site should talk you thru that.

    as always, if it sounds right to you, it probably is!
     
  9. eviljohn2

    eviljohn2
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    On a slight side note, I've just ordered the new Radio Shack SPL meter. Has anyone had any luck finding new calibration settings for it? It can't be the same as the old one.

    Even without the snapbug site it can be useful to produce your own frequency response. I did some for the Budget Sub Test thread which compared all the subs.
     
  10. Stone Free

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    Where did you get it?

    I have heard in previous posts that you can get it from Keene, but it is not showing the new part number OME33-4050
     
  11. karkus30

    karkus30
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    Mark Grant will modify my existing sub cable with a TRS plug on one end. Then make me a seperate shorter cable with the same config.

    The snapbug site is really helpful, I quick read was all I needed (just need the cables to try it). I have an SPL meter, I just need to download a few of the frequencies and burn them to disc. I did download everything from 20 to 100 in 5K steps, but there are a few specific frequencies by the look of things.
     
  12. eviljohn2

    eviljohn2
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    Easiest thing is just to download a tone generator. There's quite a few described in some of the DIY threads, assuming your PC is connected to your hifi of course.
     

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