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Sub Woofer Setting Up With a BFD

Discussion in 'Subwoofers' started by rozel, Mar 29, 2003.

  1. rozel

    rozel
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    Hi

    Having read through a lot of material on this site, I have invested in a BFD, SPL Meter and downloaded various tones which I intend to burn to a CD in readiness to sort out my Sub. This is a Yamaha YST-100. Running this I never cease to be amazed by the bass on certain DVD's - indeed U-571 is one of my favourites and I was pleasantly surprised to learn that this is used as a reference to accruately set up a Sub. However on a lot of material both Movie and Music it produces a lot of Boom Boom Boom, which I suppose is the logic of setting it up the right way and saving the "filters" on the BFD to suit different input sources - right? I am a little confused though. I have read through all the material but just need to be pointed in the right direction. My Sub has both a volume control and a frequency "cut-off" control. My present Amp does not control the output to the Sub other than in one of the menus when it can be changed in db steps up or down against the other channels. However I am getting a new 6.1 channel Receiver which will control the Sub better than this. My question is when compiling the Frequency Graph in Excel, at what level do I set the Sub's volume and cut off, what level do I set the main volume on the Amp - do I also set the sub db level anything other than zero against the other channels and am I right in assuming that I should disconnect all the other channels except the Sub channel to calibrate?

    Help please as something of a newbie. I pride myself as an audiophile over many years but this is the first time I have launched into the "science" of setting up my speaker system in a controlled way. Once I have set up my Sub, how do I go about setting up the rest of my system.

    I apologise for the length of this post but I would appreciate help to get into the practice of ironing out Sound Peaks to have a totally balanced system

    Cheers

    Paul
     
  2. Hawklord

    Hawklord
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    I don't know too much about speaker set up but came accross this the other day. :-

    http://www.snapbug.ws/bfd.htm

    you might get some tips/ feedback. I set up my system by trial and error and might look into doing it more scientifically. Where did you get your product from? Let us know how you get on and whether you thought it was a good investment.
    :smoke:
     
  3. rozel

    rozel
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    Thanks Hawklord I have been at that link and downloaded just as much info as I could get my hands on as well as other resources. However it's just wher I get started and the positions of the Sub's and Amp's volume settings when carrying out my measurements. I ordered my BFD from: -

    https://www.soundslive.co.uk

    It should arrive next week and got my SPL meter from: -

    http://www.keene.co.uk/cgi-bin/bigcodesearch.pl?SLM2055

    Anyone out there whao can help me please?????

    Cheers again

    Paul
     
  4. Hawklord

    Hawklord
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    Thanks for that I've just orderd one . What tones do you recomend to use when setting up via the spl or will the standard test signal from my Denon suffice? Where did you download your samples?
    With regard to initial speaker placement doesn't your amplifier documentation give any hints? My denon manual was invaluable giving best placement for various shaped rooms ect.
    You've got me interested in this bfd I think my credit card can manage another purchase- it's payday anyhow on Monday!:devil:
     
  5. rozel

    rozel
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    Hey - you've hijacked my thread!! - It was me asking the questions right?

    Only kidding Hawklord if I can help I will but you might recall that I have not done anything yet - I am awaiting my gear next week - so I am in the same position as you - WE BOTH NEED SOME HELP AROUND HERE !!!!

    Anyhow I will give you the links below which so far have got me interested in all this print out the documents and read as it ain't that simple.

    http://www.snapbug.ws/bfd.htm

    This document is without doubt fully comprehensive and give a lot of links to other informative site

    http://www.snapbug.ws/brucekreviewofbfd.htm

    Another helpful review and faq

    http://www.etfacoustic.com/index.html

    A program and information on how to measure the SPL's (Sound Pressure Levels) without manually recording - you set up your SPL meter with a laptop and the recordings are taken straight into your PC for frequency curve analysis - they say that this is the quickest way - we shall see !!!

    http://www27.brinkster.com/jmag999/

    Found this link yesterday - this looks extremely good in that amongst other things it relates to the newer BFD model: -

    Behringer Feedback Destroyer
    Model: 1124P
    24-Bit DSP Based Parametric Equalizer

    I am hoping to read through this later today. As I said the first link is the gateway to learning equalization techniques and it gives a link to enable you to download samples. I've done this, but the following link will give you a link to enable you to create your own: -

    http://www.nch.com.au/tonegen/index.html

    Turning to your questions - I have no idea where the best place to place speakers is - it seems when equalizing it is trial and error to get rid of your peaks and troughs (sounds painful eh!!) It wasn't speaker placement that I raised it was the settings of the Amp and Sub woofer that I was querying - my Sub as well as having a volume control has a high cut frequency control to enable cut off of high frequency anywhere from 40Hz to 140Hz and whilst I know this enables one to match the sub or to blend it in with the rest of the system, where do I set it when takinf SPL readings? This may seem obvious to some but I need this info to get started.

    To complicate matters further I am expecting to take delivery of a new Sony STR-DB 1080 6.1 channel amp next week also so matters are going to get complicated. I raised a question in a previous post as to what may be the best Rear Centre Speaker to add to my existing 5.1 setup. This comprises: -

    Fronts - My beloved Spendor BC1's - Floor standing (on spiked stands)

    Centre - a Yamaha NS-C80

    Rears - a pair of Mordant Shorts ceiling mounted

    Sub Woofer - a Yamaha YST-SW100

    Any further help would be appreciated

    Cheers

    Paul
     
  6. rozel

    rozel
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