What did I do wrong with my BFD and SVS?? HELP!

Discussion in 'Archived Threads 2001-2004' started by DanSt, May 10, 2002.

  1. DanSt

    DanSt Stunt Coordinator

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    [​IMG]
    Well, I got my BFD and proceeded to tame the 15db peak at 50hz. Personally I think I did a pretty good job leveling my output. First DVD I popped in was Star Wars TPM. Normally I could feel a fair share of the movie. Nothing in the WOW area. Now its even worse. I even completely recalibrated the sub and had to up the sub amp quite a bit (as I expected I would). I even made the output "HOT". But I am still very underwhelmed and dissapointed. Did I do something wrong?? Please any help would be greatly appreciated.
    NOTE: Do not pay attention to anything above 89Hz as I stopped measuring there.
     
  2. DanSt

    DanSt Stunt Coordinator

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    [​IMG]
    Thought I would post a layout of the room just in case it could help.
     
  3. Mike Matheson

    Mike Matheson Second Unit

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    Does that graph reflect just your sub's output, or is it inclusive of your sub & the mains being active?
     
  4. DanSt

    DanSt Stunt Coordinator

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    Just the sub
     
  5. Jeffrey Noel

    Jeffrey Noel Screenwriter

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    If you want that extra little "kick" which, from what I understand, is more prominent in the 30hz to ~55hz range, don't try to tame that 50hz peak so much. You seem to have some type of null around 35hz which will take away that "kick." Many people do not like a flat low frequency as it may sound dull. I actually plan on doing the same thing on one of the channels of my BFD for movies and leaving it all smooth for music on the other channel.
    Clear as mud? [​IMG] Sorry if it doesn't make any sense, I'm not good at typing what I'm thinking! [​IMG]
     
  6. Brian Fellmeth

    Brian Fellmeth Supporting Actor

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    1) double check receiver settings. sub on (or yes), mains small.

    2) Add a -5db filter at 64 Hz, 6/6- octave and a +5 at 36 Hz 10/60 octave. Recalibrate, then make about 6db hot.

    3) If this fails, then try a phase adjustment. You may have some cancillation, esp if mains are set to large.

    You have already acheived a pretty flat response, it should sound great. Maybe your expecting to hear boomy deep bass that lessor units bellow out.
     
  7. brucek

    brucek Second Unit

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    Dan,
    You did a very nice job of removing the 50Hz peak. You also correctly then did a wholesale increase of the sub volume to compensate. You're use to listening to that "one note" bass at 50Hz and had your sub level set accordingly. Now you have properly reduced that peak and have a flat response.
    The problem you're experiencing now is that overall flat bass response is just that - flat. The solution is absolutely not to bring back the 50hz peak, but to add a pleasing house curve to your response. By this I mean an even rise in level as the frequency lowers down to about 30Hz and then level off.
    Do a search here on the words "house curve", and after you've spent the next few hours you'll know what I'm talking about.
    I have a neat trick to add a house curve to a BFD you seem like a good candidate for. See Sonnies web site www.snapbug.ws/bfd.htm under:
    http://www.snapbug.ws/brucekbfdbandwidthinfo.htm and scroll down and read the stuff on house curve....
    brucek
     

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