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Thread: Adding a bohlender graebener ribbon to gen v or vi

  1. #11
    WBF Technical Expert (Speakers & Audio Equipment)/Member Sponsor [Technical Expert] garylkoh's Avatar
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    The 28-inch driver is no longer made - Arnie designed the 450XS around it, but I didn't carry that model forward because there were a few problems with obtaining parts for it, principally the 28-inch ribbon.

    In 2005, we launched a Genesis 3 using a new 26-inch midrange. Unfortunately, two companies that were critical to making this speaker folded before we even got to production - the company that made the 26-inch ribbon midrange, and the company that did the CNC design and machining of the egg-shaped body. Here's the prototype we showed at CES. If you thought that the Apogee Stage was an amp-buster - the prototype had an impedance of 0.6 ohm at 180Hz and 0.8 ohm at 390Hz. It smoked three power amplifiers before I modified a quartet of my M60 tube amplifiers to drive it during CES.

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    __________________________
    Gary L Koh, CEO and Chief Designer,
    Genesis Advanced Technologies

  2. #12
    Member Addicted to Best! NorthStar's Avatar
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    Quote Originally Posted by garylkoh View Post
    ... Here's the prototype we showed at CES. If you thought that the Apogee Stage was an amp-buster - the prototype had an impedance of 0.6 ohm at 180Hz and 0.8 ohm at 390Hz. It smoked three power amplifiers before I modified a quartet of my M60 tube amplifiers to drive it during CES.

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    That is playing with extreme "fire" Gary!
    All the Very Best, - Bob --------- "And it stoned me to my soul" - Van Morrison --------- AudiophileAudition

  3. #13
    WBF Technical Expert (Speakers & Audio Equipment)/Member Sponsor [Technical Expert] garylkoh's Avatar
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    Quote Originally Posted by NorthStar View Post
    That is playing with extreme "fire" Gary!
    Pretty speaker wasn't it? One day I'll tell you all about the inspiration for the shape.
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    Gary L Koh, CEO and Chief Designer,
    Genesis Advanced Technologies

  4. #14
    Member Addicted to Best! NorthStar's Avatar
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    Quote Originally Posted by garylkoh View Post
    Pretty speaker wasn't it? One day I'll tell you all about the inspiration for the shape.
    The design (visual appearance) looks like a bowling 'quille' (pin) cut in half, to form the two speakers. I kind of like it.
    What I like less is the impedance, ouch!

    * It could also be a cello, cut right in the middle. ...Or a suitcase for an acoustic bass. ...A piano cut in half and standing up on its keyboard?
    All the Very Best, - Bob --------- "And it stoned me to my soul" - Van Morrison --------- AudiophileAudition

  5. #15
    [Industry Expert] Member Sponsor Addicted to Best!
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    It's modeled on .... a certain model ... Claudia Shiffert *ahem* lower body dimensions
    Carolyn "The sister" Koh
    COO, Genesis Advanced Technologies, Inc.
    Genesis Advanced Technologies
    Absolute Fidelity Cables

  6. #16
    [Industry Expert] Member Sponsor Addicted to Best!
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    When we showed it, everyone, but everyone had to pet it. Men and women alike.
    Carolyn "The sister" Koh
    COO, Genesis Advanced Technologies, Inc.
    Genesis Advanced Technologies
    Absolute Fidelity Cables

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