Room peaks tamed with BFD

Discussion in 'Archived Threads 2001-2004' started by MarkFrab, May 13, 2002.

  1. MarkFrab

    MarkFrab Agent

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    Hi all,
    I just spent all day tweaking my new BFD to flatten my in-room response.
    Initially I had both subs in the same corner (on the left in the picture below), but I found that the sweet spot was exactly one person wide. [​IMG] The freq response of the couch was +- 14db for the worst case tone. :b
    After moving the 2nd sub to the right corner and flopping it's phase 180 degrees I got nearly even response at every seat on the front couch. There ended up being about a (worst case) 4dB difference between the left and right seats. That's right! As calibrated, the entire couch is now +- 2dB. [​IMG] Plus raw c-weighted FR is +- 3db from 16 to about 100hz. Add the correction factor and I end up with a nice gental room curve.
    Room layout (not exactly to scale:b):
    [​IMG]
    Before FR (and before relocating 2nd sub):
    [​IMG]
    BFD config:
    [​IMG]
    After FR:
    [​IMG]
    Picture of very messy room:
    [​IMG]
    Now all I have to do is pull the TV out and plug the BFD in behind there and route the sub#2 speaker cable and I'll be done... at least until I get a front projector! [​IMG]
    Regards.
     
  2. Ned

    Ned Supporting Actor

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    Cough frequency response, the new performance goal [​IMG]
    In my ht, the left chair is about +/- 2db but the right chair sounds like a 10db null in the lowest octaves. So naturally I sit in the left chair and forget about it [​IMG]
     
  3. Dzung Pham

    Dzung Pham Second Unit

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    Mark, thanks for sharing your results. I had always heard that it was difficult to EQ two subs in different locations but it seems you've managed to do it beautifully. Could you explain the different colors on your graphs? I wasn't quite sure what the "R" and "C" stands for.
     
  4. MarkFrab

    MarkFrab Agent

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    Dzung,

    -R = "Raw" C-weighted SPL reading

    -C = "Corrected" unweighted SPL

    The charts include raw and corrected readings for the sub only (Blue, Magenta) and raw and corrected readings for subs + mains (Yellow, Cyan).

    Also, without the variable phase adjustment of the SVS Black Box for Sub #2 I don't think I'd have been able to make it happen.

    Regards.
     

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