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Move that air!

Discussion in 'Amps and Cabs [BG]' started by Michael Jewels, Aug 21, 2002.

  1. In the current (September 2002) issue of Bass Player magazine on page 11, there's a response to a question someone sent in as to which cabinet moves more air, a 1x12 or a 2x10. They gave a pretty safe answer about all things being equal, yada, yada, yada that the 2x10 should move more air. Anyway, that's not why I'm starting this thread; they also had the approximate cone areas of the most common bass speakerss, which I will now share with you guys & gals in case you don't have access to BP mag. And here we go~~~~~~~~~~

    1x8 ~~~~~~~~~~ 35 square inches
    1x10 ~~~~~~~~~ 55 Square inches
    2x8 ~~~~~~~~~~ 70 square inches
    1x12 ~~~~~~~~~ 80 square inches
    2x10 ~~~~~~~~ 110 square inches
    1x15 ~~~~~~~~~ 130 square inches
    4x8 ~~~~~~~~~~140 square inches
    2x12 ~~~~~~~~~ 160 square inches
    3x10 ~~~~~~~~~ 165 square inches
    1x18 ~~~~~~~~~ 185 square inches
    4x10 ~~~~~~~~~ 220 square inches
    2x15 ~~~~~~~~~ 260 square inches
    8x8 ~~~~~~~~~~ 280 square inches
    4x12 ~~~~~~~~~ 320 square inches
    6x10 ~~~~~~~~~ 330 square inches
    2x18 ~~~~~~~~~ 370 square inches
    8x10 ~~~~~~~~~ 440 square inches

    So, I don't know how useful this is, but, at least we non-techies have a starting point from which to judge our present speakers, and an idea of how much area we'd be adding with another speaker.
    Cabinets sold separately. :D

    Mike J.
  2. If a 1x15 moves more air than 2 10s, then why do the 15 combos usually have 1-200 watts, when the 2x10s have 3-600 watts?
  3. That, is a very good question. I don't know.

    Mike J.
  4. rllefebv


    Oct 17, 2000
    Newberg, Oregon
    So many factors involved, one of which may be that a 1X15 cab will 'typically' be 8 ohms while a 2X10 cab will 'typically' be 4 ohms... 300 watts into a 4 ohm load will 'typically' run 200 watts into an 8 ohm load... That being said, the surface area of a speaker has nothing to do with the amount of power run into it... Typically, that is! :D

  5. Skorzen


    Mar 15, 2002
    Springfield MA
    My guess is that the 15" speaker has a lower power handling because it is the only speaker in the cab, and then can not share the power load with a second as in the 2X10. The company wants to keep the price down so they don't buy high power speakers. Thats my quick off the cuff guess.
  6. Golem II

    Golem II

    Jan 4, 2002
    Macon, GA, USA
    8 x 18 : 1480

    But there's no ranking for a 21" speaker! How will we know how much air the Whappo Grande moves?
  7. Not quite accurate.

    Volume displaced is the square inches of the piston area of the cone multiplied by the distance the cone moves.

    The Thiele-Small parameters are Sd * Xmax.

    My 10" subwoofers will displace far more air volume than many 15" drivers. It all depends on the parameters of each driver.

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