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Brahma 15 EXTREME, and 18!

Discussion in 'Home Theater Projects' started by DerrickW, Apr 22, 2003.

  1. DerrickW

    DerrickW Well-Known Member

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  2. Cam S

    Cam S Well-Known Member

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    Good god that sounds bad, but I wonder what exactly they did to make them so much more powerful. The things they listed don't seem like enought to do that to a driver. Those things sure are friggin expensive though.
     
  3. DerrickW

    DerrickW Well-Known Member

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    The price is nuts, but for car audio competition where #of drivers is important this thing should kill other subs.
     
  4. There will be a pre-order for the Brahma 18 [​IMG]

    and those on the pre-order will go through the following transition:
    [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG][​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] ........[​IMG]
     
  5. Brett DiMichele

    Brett DiMichele Well-Known Member

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    hahah Gomer!

    There should be a rule about using so many emoticons in a
    row.. You know how long it took me to load this post on my
    dialup connection! [​IMG]
     
  6. Chris Tsutsui

    Chris Tsutsui Well-Known Member

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    If you read the fine print it says "Please allow 8 weeks for deliver of this hand-built monster."

    At least it doesn't say "Please allow 8 months for confirmation of delivery of this VC inspected monster."
     
  7. Seth_L

    Seth_L Well-Known Member

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    Now, Now Chris it was only 5 months until we got tracking numbers. :p

    Seth
     
  8. Bill Fagal

    Bill Fagal Well-Known Member

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    Interesting:

    56mm of Xmag, 33mm of Xsus. Seems to illustrate what Dan W. has said before, that the cone suspension is the current bottleneck in the advancing state of the art.

    I suspect they've pretty much tapped out all the travel they can build into the standard cast baskets available, short of moving to a flat diaphragm to let them raise the spider one last bit. I predict we're going to see some new basket castings before Xsus gets much past 40mm. Too bad if it's true, because it likely means more expense.
     
  9. Seth_L

    Seth_L Well-Known Member

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    The driver sounds like a recipe for disaster. The motor can out throw the suspension by 23mm each way. That's almost one full inch. Wouldn't it be really easy to damage a driver with this recipe?

    Seth
     
  10. Bill Fagal

    Bill Fagal Well-Known Member

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    Yeah, the spider/surround sure better be glued well. But I'm sure it's clearanced for plenty of swing past Xsus.

    By designing for throw past Xsus, they're just going for raw displacement over linearity. After all, distortion isn't a concern in SPL shootouts.
     
  11. Distortion is a bonus! it adds SPL [​IMG]
     
  12. Brett DiMichele

    Brett DiMichele Well-Known Member

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    Well I guess if you want serious, SERIOUS extension out of
    a driver it's simple.. You rip off the magnet structure and
    throw the spider out the door.. get a basket that can take
    2 inches of throw or more and hook it up to a high speed
    servo motor. [​IMG] Ohh wait I just described a Servo-Drive
    sub [​IMG]
     
  13. Bill Fagal

    Bill Fagal Well-Known Member

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    Unfortunately for Servodrive (and the rest of us), cones still need suspension, no matter what kind of motor they're driven with...

    One thing about servo motors, though: they have that whole Xmag thing pretty well sorted out--how does infinite Xmag strike you? [​IMG]
     
  14. Brett DiMichele

    Brett DiMichele Well-Known Member

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    True they do need suspension no getting around that.. But
    they don't need the spider to control cone movement so that
    eliminates a big part of the problem. Surrounds today are
    at the peak of the technology I belive and I don't think we
    are going to see much more out of the typical high roll
    rubber/santoprene's used currently. I think if we ever want
    to see a sub that can have a one way X-Max of say 3 or 4
    inches then a radical rethink and redesign will be in order.

    [​IMG]
     
  15. Bill Fagal

    Bill Fagal Well-Known Member

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  16. Brett DiMichele

    Brett DiMichele Well-Known Member

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    Bill,

    Right you are! It seems. I thought since the sevo motors
    dampened the movement the only suspension needed was the
    surround. [​IMG]
     
  17. MichaelAngelo

    MichaelAngelo Well-Known Member

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    "I think if we ever want
    to see a sub that can have a one way X-Max of say 3 or 4
    inches then a radical rethink and redesign will be in order. " -- Brett D

    Brett,

    Would suspending the outer edges of the cone the way the voice coil is supended, via magnetic field, be possible? "Float" the cone via MF, instead of with rubber/foam?
     
  18. unless you have the cone riding like a piston inside a cylinder...xmax is as long as the cylinder then [​IMG]
     
  19. Brett DiMichele

    Brett DiMichele Well-Known Member

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    Mike,

    Heh I dunno but as successful as I have been with magnetics
    I'd have to say doubtful.

    I think it needs to be simple and it could be... Piston in a cylinder sounds like a good idea.. What do you do for
    suspension though.. "Piston Return Springs" ??? LOL!
     
  20. Cam S

    Cam S Well-Known Member

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    This whole "piston" idea is making me think about using something like a car engine, where the suspension is the crank, and the crankshaft would be the motor like in the servo drive subs. You could have a 12" cone/piston moving 6" total inside a chamber thus giving you your bass. Correct me if I'm wrong, but wouldn't this displace a SHIT LOAD of air?? Or maybe I'm totally off base here?
     

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