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Thread: Speaker setup

  1. #11
    Join Date: May 2016

    Location: north wales

    Posts: 652
    I'm peter.

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    i used the isotek ultimate setup disk , it was simply the best way for me ,
    peter

  2. #12
    Join Date: Dec 2018

    Location: Alford Lincolnshire

    Posts: 76
    I'm William.

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    Hi All

    I quite like this guys explanation. Setting your speakers starts round about 18:00.

    https://youtu.be/84Pf0ycbyBM

    Happy New Year to all

    Regards

    William

  3. #13
    Join Date: Nov 2011

    Location: wirral

    Posts: 231
    I'm frank.

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    Hmm, so tweeters radiate like lasers do they?

  4. #14
    Join Date: Jan 2008

    Location: Norfolk, UK

    Posts: 5,344
    I'm Rob.

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    It would be rather unusual if they did. Talk about a narrow sweet spot!

    Admittedly ribbons and electrostats can have a comparatively narrow dispersion, but hardly what one would call 'like a laser'.
    Main system
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  5. #15
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 30,281
    I'm Martin.

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    The higher the frequency the more directional it is.
    Current Lash Up:

    *Audiolab 6000CDT* SoncozSGD1 * Krell KSA100 mkII * JM Lab Electra 926 *


    'You fool! To think that your ape-brain could contain the full knowledge of the Krell!'

  6. #16
    Join Date: Nov 2011

    Location: wirral

    Posts: 231
    I'm frank.


  7. #17
    Join Date: Mar 2010

    Location: Cardiff

    Posts: 390
    I'm Rockabilly.

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    Thanks for this link, Frank.
    I have employed a similar approach to toe-in, as the author discusses, in my listening room because the area is a little smaller than the ideal for minimisation of reflections at the listening position.
    The results have been worthwhile.
    I did note, however, that the article does not consider wave interference due to increased toe-in and it's effects, such as comb filtering.
    No doubt for reasons of simplicity, it does not include dispersion angles or frequency in the equations.
    Neither does it discuss the relationship between height of the listening position and bandpassed drivers. Or ceilings!
    Nonetheless, It's an enjoyable academic article.
    Johnny Dodgem.

    Cartridges vintage MMs including Pickering xsv-4000/xsv-3000 : Stanton 881s/D81 : AT140LC/VMN40ML
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  8. #18
    Join Date: Feb 2013

    Location: Suffolk

    Posts: 1,022
    I'm guy.

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    Thanks for the link - I usually give up part way through but he seems to be knowledgable, interesting and (most importantly!) not trying to sell me anything

    Link has got me thinking, I would like to see opinion/s on long large rooms and carpet or not - will start a thread.
    LP12, Ittok, DV10X5, NVA Phono 2 (twin supply), NVAP50/A4O'S, LS5, Rega Ela mk1's.
    Sony CDP XB930.

  9. #19
    Join Date: Nov 2011

    Location: wirral

    Posts: 231
    I'm frank.

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    He probably didn't include the ceiling as the height puts the first reflection delay outside the 'danger' window.
    I'm intrigued why you think toeing in increases comb filtering/wave interference can you point me to any links that discus this?
    I may be misunderstanding here-wouldn't be the first time;-);The height vs bandpassed drivers I can only conclude the author is assuming any listening is made at a distance sufficient for the main front lobe to form?

    Cheers
    F
    Last edited by cooky; 23-01-2021 at 12:33.

  10. #20
    Join Date: Mar 2010

    Location: Cardiff

    Posts: 390
    I'm Rockabilly.

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    I think you're correct in both postulations.
    That is, the author is assuming a front lobe at the listening position and that ceilings are considered not dangerous in this scenario.
    Perhaps, this is one case in which an artexed ceiling may be an improvement over a flat surface! Gotta break up those reflections, man.
    I think it's a good article - I was just noting the assumptions required to keep the maths 'doable' - for example, the thickness and effective density of the surfaces is ignored, et cetera.

    I don't have any links to comb filtering in domestic audio systems but I think it's safe to say that toe-in angle is a factor in HF interrelation.
    I'm happily prepared to be shown otherwise, if I'm scribbling nonsense.
    (The lower frequencies are part of the equation also but if you are listening a few metres from the source, then room interaction is probably of greater consequence. Your neighbours may disagree, given that the wavelength of 80Hz is approximately 4m, whereas 8000Hz is about 4cm.
    I've experienced comb filtering in the bass when operating PA systems in the open air, with multiple driver arrays, at listening distances that are significant with respect to wavelength.)

    Consider two cabinets in parallel. At a distance x from the tweeter, dependent upon the horizontal dispersion, the direct waveform from each source will meet and interact.
    If you increase toe-in, then the wave fronts will meet earlier. If they meet in front of the listening position, then there is the potential for this effect to be heard.
    Would you agree? I know that there's not much pressure energy involved but perhaps enough interference to change perception of the stereo image, if not timbre, which is where the author of the article comes in.

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