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odd speaker designs...

Discussion in 'Beginner Electronics' started by Ernie Werbel, Mar 26, 2007.

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  1. Ernie Werbel

    Ernie Werbel Guest

    Hi all. I am an electronics enthusiast, and I love taking apart discarded
    radios and TVs to tinker around. I have come across, among other things,
    something in particular about speakers that seems to stick in my mind for
    some reason.

    Most, if not 99% of all the speaker cones I have seen, consist of a center
    magnet with four spokes extending outward toward the frame in a + shape.
    However, in my adventures I have come across, on very rare occasions, some
    speakers with only THREE spokes. These are usually small ones, about 2 to 4
    inches in diameter. I have seen larger ones with as many as five or six
    spokes. I have even come across one with only two spokes, and still another
    type with not spokes, but about a dozen circular holes around the magnet.

    I was wondring if anyone else here is familiar with what I consider to be
    unique and unusual speaker frame designs? Also, while I can see four spokes
    as being a good design, I wonder why it is more predominant than say, the
    three-spoked frame, which would use less material to fabricate?

    Another thing I would like to point out is where the magnet is housed. Most
    of the speakers I come across have a drum-shaped housing with the magnet
    concealed. I have come across a few with a square metal frame with the
    magnet exposed (cheaper to make I presume).

    Just thought I would share this with the group. I hope you at least find it
    interesting as I did.
     
  2. Coyoteboy

    Coyoteboy Guest

    Ernie Werbel proclaimed to alt.electronics ...
    I have some monster 15" cones with 6 spokes, rubber protected magnet edges
    and a hole through the middle (presumably for cooling?). I know little of
    speaker designs.
     
  3. default

    default Guest

    Why not one "spoke?" Less material . . .

    There's a compromise between cost and benefit - Ideally the frame
    should be 100% rigid and not flex or ring. High quality speakers use
    a cast aluminum "basket" - light, very rigid, resists ringing, and
    costs more.

    With stamped steel, four thinner frame members probably works better
    than three thicker ones.

    Tweeters and midranges sometimes use a solid basket
     
  4. Ernie Werbel

    Ernie Werbel Guest

    Thanks for the response. I have been taking some time to research this some
    more. It seems that the size of the vents behind the diaphragm affect the
    airflow as well as the size of the cabinet it is enclosed in. Apparently,
    speakers with three arms will response differently than four. Perhaps the
    formula using four arms in a frame has been determined to be the recipe for
    the best cost vs efficiency in typical designs?

    Ernie



    default wrote in message ...
     
  5. Ernie

    Ernie Guest

    ----- Original Message -----
    From: "Coyoteboy" <>
    Newsgroups: alt.electronics
    Sent: Thursday, March 29, 2007 7:41 PM
    Subject: Re: odd speaker designs...


    I came across on the Internet what looks like a scan of a magazine article
    about a speaker.

    http://www.lansingheritage.org/images/jbl/specs/pro-comp/2205/page1.jpg

    They describe vents near the magnet to cool the speaker. The voice coil,
    being pumped constantly with current, must get very hot I imagine!

    Ernie
     
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