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Thread: My new Loudspeaker Systems – Great Plains audio

  1. #46
    RIP 2011 neanderthal's Avatar
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    Quote Originally Posted by Gary L View Post
    WOW SPKRMAN, now that is interesting! I guess I expected GPA to be comprised of a dozen or more X Altec employees. I have spoken with Bill on a few occassions and found him most accomodating and knowlwdgeable.
    Every time I see his new components I think it is time to move from my Vintage groove.
    Please give us some insight as to the comparisons you have found between old and new drivers. If anyone could possibly preserve tradition I think it would be Bill at GPA.
    A friend Dave WOJO who also is a member here has wonderfull things to say about new GPA offerings.
    Could this be the vintage gear of tomorrow?

    Gary
    When I went to Great Plains Audio Bill had a kid (20 something year old audio wiz) that also works there and there was a woman possibly his wife that was in a room filled with test equipment ect doing something but don't know what as I walked by the door and looked in.This was on a saturday morning maybe during the week their were more employees
    Last edited by neanderthal; 06-30-2008 at 03:07 PM. Reason: addition

  2. #47
    Senior Member Skywave-Rider's Avatar
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    Big thanks for the reference to these components!
    Love the speakers Stephane

  3. #48
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    Quote Originally Posted by neanderthal View Post
    When I went to Great Plains Audio Bill had a woman possibly his wife that was in a room filled with test equipment ect doing something but don't know what as I walked by the door and looked in.
    That is the coil winder tech, not his wife.

  4. #49
    Senior Member stephane RAME's Avatar
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    Hello,
    After consulting with the manufacturer of auto-transformers, I add an L-Pad to finalize the settings.
    Regards
    Stéphane
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  5. #50
    Senior Member JoMoCo's Avatar
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    Crossover Changes

    Stephane, would love to hear your comments of the evolution in sound improvement / changes... between your current version with its different components and first versions which you changed & moved away from...
    Thanks in advance
    Jon

  6. #51
    Senior Member stephane RAME's Avatar
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    Hello,
    The first version of the filter was advised by the LDA which store my advisor for this project.
    The second version was the first test with theoretically more efficient components, capacitor paper, autotransformer, large self induction, resulting in an improved low-frequency area, but less good in the high frequency.
    The third version brings improvements in the high frequency but a high level problem, his uptight.
    The latest version fixes the problems high level, but requires a move up a notch setting the autotransformer.
    In summary, between the original and the latest version, improving the overall transparency, enhanced with more material in the low frequency, high-level improvement in high frequency.
    Best regards.
    Stéphane

  7. #52
    Senior Member JoMoCo's Avatar
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    Stephane hello,
    Who is the manufactor / dealer / model for the autoformer?
    Thanks

  8. #53
    Senior Member stephane RAME's Avatar
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    Hello,
    Autotransformer I buy this on eBay a German seller (http://shop.ebay.fr/merchant/mast_mutter).
    Best regards
    Stéphane

    http://cgi.ebay.fr/Auto-Transformer-...3A1|240%3A1318

  9. #54
    Senior Member JoMoCo's Avatar
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    Transformer Attenuator

    What would you think of substituting a Fostex R100T instead?...I checked out the ebay store link but it does not look set up to sell internationally to the USA? They seem to be approx the same price excepting the 1dB rotary dial on the Fostex...I don't know if the more generally availible 70volt or 25volt transformer attenuators would be applicable here or if they have the sound quality needed. I wonder what Shindo uses on his HF field coil drivers?...
    Thanks Jon

  10. #55
    Senior Member stephane RAME's Avatar
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    Hello,
    Yes, it is possible to use as the Fostex R100T transformer.
    Very little information on Shindo online.
    Best regards
    Stéphane
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  11. #56
    Senior Member stephane RAME's Avatar
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    Rca Mi-9472a

    Hello,
    A new auto-transformer for my crossover frequency, the model RCA MI-9472A.
    Much less progressive in the settings.
    Stéphane
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  12. #57
    Senior Member stephane RAME's Avatar
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    New horn WESTREX ACOUSTILENS

    Hello,
    The first pictures of my new horn WESTREX ACOUSTILENS before mounting in place of MRII564.
    Stéphane
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  13. #58
    Senior Member caladois's Avatar
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    How do it works compare to GPA horn ?
    Regards Stephane

  14. #59
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    I see they are made in the UK...... does that mean they they were actually made by Vitavox, or did WE actually have a factory over there?

    How will you mount them? They don't have holes, like the Mantaray, and I would drill any in such a vintage horn, personally.

  15. #60
    Senior Member stephane RAME's Avatar
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    Hello,
    Listening is the first promise, I expect the assembly to say.
    The assembly that will not drill the vintage horn.
    The pictures for the weekend
    Stéphane

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