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Thread: My new Loudspeaker Systems – Great Plains audio

  1. #16
    Senior Member spkrman57's Avatar
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    GP 399 drivers sound great!

    I use mine on a 500hz round wooden Edgarhorn crossed over at 800hz 3rd order and does well up to the 18Khz limit.

    Ron
    JBL Pro for home use!

  2. #17
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    Thumbs up Thanks

    The photographic account is interesting and useful.

    Le bulletin photographique est intιressant et utile.
    Out.

  3. #18
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    What is the tuning frequency of the reflext enclosure?

  4. #19
    Senior Member stephane RAME's Avatar
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    Hello, I do not have this information, if that can help you, here some details suplemantaires:
    - exterior volume 415 liters
    - interior volume 330 liters
    - surfaces event 360 cm².
    Stephane

    Quote Originally Posted by Ian Mackenzie
    What is the tuning frequency of the reflext enclosure?

  5. #20
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    Hi Stephane,congratulations you really have a nice project,i'm curious and i'll be delighted to hear your listenings impresssions concerning theese,i don't know that much about GPA but i guess it's one step further in the audioworld,i'll make a search through google in order to get myself documented,by the way,no regrets for your 4430?they were pretty nice too,regards MEvin

  6. #21
    Senior Member stephane RAME's Avatar
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    Hello, according to what I included/understood, company GPA, are the old ones from ALTEC, which took again all the service part after sale and continues has to manufacture best the references of this manufacturing.

    For GPA, to see the bonds according to: http://www.greatplainsaudio.com/

    Not,je regret not my JBL 4430, it adapts better has my part , owing to the fact that they less low descent in frequencies, if not they are more dynamic, request much less power and I find low medium clearer and detailer.
    Stephane.

    Quote Originally Posted by takenodisk
    Hi Stephane,congratulations you really have a nice project,i'm curious and i'll be delighted to hear your listenings impresssions concerning theese,i don't know that much about GPA but i guess it's one step further in the audioworld,i'll make a search through google in order to get myself documented,by the way,no regrets for your 4430?they were pretty nice too,regards MEvin

  7. #22
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    fantastic

    Thanks Stephane for the link,it would be of great help for Altec owners,that's awesome,anyone can go for old Altec speakers in need of restoration,almost any replacements can be found,even for Gauss or EV.

  8. #23
    Senior Member spkrman57's Avatar
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    Great Plains audio is my source for anything Altec

    Bill Hanuschak is a great guy and answers technical questions to help out.

    Great Plains audio is a company of one, Bill that is and he was one of the last standing engineers of Altec before Extra Viscious(EV) took them over. He also bought a lot of the tool and die equipment so that the same equipment that was used for making Altec drivers is the same used today.

    His drivers are good enough quality for me to buy, if that means anything to anybody.

    Ron
    JBL Pro for home use!

  9. #24
    Senior Member stephane RAME's Avatar
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    Calculation theoric of the frequency of resonnance of the enclosure

    Hello, I ended up finding the formula for the calculation theoric of the frequency of resonnance of this enclosure.
    this frequency is thus +/- 40 Hz.
    Stephane

    Quote Originally Posted by Ian Mackenzie
    What is the tuning frequency of the reflext enclosure?
    Attached Images Attached Images  

  10. #25
    Gary L
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    Quote Originally Posted by spkrman57
    Bill Hanuschak is a great guy and answers technical questions to help out.

    Great Plains audio is a company of one, Bill that is and he was one of the last standing engineers of Altec before Extra Viscious(EV) took them over. He also bought a lot of the tool and die equipment so that the same equipment that was used for making Altec drivers is the same used today.

    His drivers are good enough quality for me to buy, if that means anything to anybody.

    Ron
    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

  11. #26
    Senior Member spkrman57's Avatar
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    Altec and Great Plains drivers are almost identical!

    Most are identical except for some later drivers that were more driven by using only 4 types of magnets(EV's decision) whereas Altec used 12 or so different magnets.

    Bigger magnets do not always mean a better driver.

    Bill modified some drivers to bring them back to the orignal specs.

    Naming conventions for the drivers have changed only due to legal copyright issues as Bill has some original equipment to make the drivers the same as the original Altec drivers.

    Altec is a company owned by overseas folks and about to be merged again(seen on this forum last week)!

    Ron
    JBL Pro for home use!

  12. #27
    Senior Member louped garouv's Avatar
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    Quote Originally Posted by spkrman57
    Altec is a company owned by overseas folks and about to be merged again(seen on this forum last week)!

    Ron
    has this been substantiated? I thought Todd was waiting for an official release before sharing the 'new' news...

  13. #28
    Senior Member stephane RAME's Avatar
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    New filter

    hello, a photograph of the new filter with autotransformer
    Attached Images Attached Images  

  14. #29
    Senior Member UreiCollector's Avatar
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    Nice work

    Very nice work on your cabinets!
    Frederick

  15. #30
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    HF Horns

    Hi
    What is the HF horn you are using?
    I wish I could build such loudspeakers.
    Regards
    Rajiv

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