Rew graph monolith

Discussion in 'Subwoofers' started by tannyh, Sep 8, 2012.

  1. tannyh

    tannyh
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    Hi

    I have recently purchased a new Bk monolith and thought i'd have a play with REW. I finally managed to get it working on ubuntu (linux), I think:clap:. Having bought a radioshack SPL meter from amazon, im not sure if the calibration file will work for this meter as it looks different to every picture ive seen of the radioshack meter??


    The REw graph shows a massive peak at 40hz. Where i can position the subwoofer is very limited so i am wondering if a BFD would help in this case or whether i should invest in an antimode??
     
    Last edited by a moderator: Sep 8, 2012
  2. tannyh

    tannyh
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    Last edited by a moderator: Sep 8, 2012
  3. MI55ION

    MI55ION
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    A bfd can certainly help but i would recommend an antimode just for simplicity and peace of mind.

    Btw, is your room 4.5m x 4m x 2.5 approx by any chance?
     
  4. tannyh

    tannyh
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    My room size is 4.2m * 3.2m into the bay window and about 2.8m in height. I am going to try and move the subwoofer lengthways as opposed to the orientation it is in to see if this makes a difference.

    I'm not sure it will cure such a big peak like the one i have got but its the only position i can put it.

    The other option would be to move it to the other recess on the other side of the chimney but cabling would be an issue as i have all my speaker cables running along the edge of the carpet around the fireplace and i'm not sure there's room for the subwoofer cable to be hidden.

    room layout | Flickr - Photo Sharing! - room layout

    IMAG0001 | Flickr - Photo Sharing!

    Excuse the poor drawing and messy room :blush:
     

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  5. tannyh

    tannyh
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    Ive done some further experimenting, but it seems like turning the subwoofer lengthways behind the front right made little to no difference to the rew plot.

    I then tried the other side of the chimney recess and although it reduced the peak at 40hz, i now have a null between 20-30hz and overall the response is more valleys and hills. Ive moved the monolith back to its original location. Looks like I may need to invest in either an antimode or BFD:thumbsdow.
     

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  6. MI55ION

    MI55ION
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  7. tannyh

    tannyh
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    Wow that is quite a difference! I take it you recommend the antimode then? I just feel it is rather expensive at £200. I have put a wanted ad in the classifieds section so heres hoping i can get it for less than that.

    Now that I know i have a massive peak at 40hz, im constantly listening out for it, arrgh!
     
  8. MI55ION

    MI55ION
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    What you have there is a classic room mode, best solution is the antimode.

    Consider yourself lucky you have no major nulls in the first location!
     
  9. sergiup

    sergiup
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    I need to re-measure mine, although currently it sounds good enough.
    The Antimode is definitely a good device, and had it not been for my desperate desire to fiddle I would've probably got one of those instead of a BFD... it also helped that I got mine for only £60 or so including MIDI cable and jack/RCA adapters.
     
  10. tannyh

    tannyh
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    Ive managed to secure an antimode from the classifieds, hopefully I should have it by midweek. If it can tame that massive peak, it will be money well spent. I was contemplating a bfd but after the struggle to get REW to work with my computer i wanted something a little easier.
     
  11. IronGiant

    IronGiant
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    I used to have a BFD and once we did a sit on the sofa and listen to a film comparison between it and an antimode sold the BFD. :smashin:
     
  12. tannyh

    tannyh
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    Got the antimode installed today. The difference is definately noticeable and it has got rid of the boominess making the sound more balanced. I'm not going to bother measuring with REW as i'm well impressed with the sound now!
    Thanks for all the help and opinions!
     

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