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  1. #1
    LWW's Avatar
    LWW is offline Senior VIP Member

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    Dayton, Ohio
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    Technical question.

    I have a discussion going on at another forum with a person who claims to be a champion audio system builder and installer.

    I make no claims to this, but I'm not a hack fanboy novice either.

    Here is the debate.

    If you have a single speaker with an efficiency rating of 120 DB SPL at 1 watt at 1 meter I claim that:

    - To raise it to 130 DB SPL at 1 meter requires 10 watts.

    - To raise it to 140 DB SPL at 1 meter requires 100 watts.

    - To raise it to 150 DB SPL at 1 meter requires 1,000 watts.

    - To raise it to 160 DB SPL at 1 meter requires 10,000 watts.

    - To raise it to 170 DB SPL at 1 meter requires 100,000 watts.

    - To raise it to 180 DB SPL at 1 meter requires 1,000,000 watts.

    Assume that the power supply never drives the speaker to clipping, the speaker never blows, and the tone is constant and all things other than power input and SPL rising, remain constant.

    My position is that the laws of physics rule and the predicted DBs will be reached until either the amp or the speaker reach their physical limits where they can longer perform.

    Their position is that the laws of science don't apply in the real world and their experience makes them right, period, end of discussion.

    Opinions from a position of knowledge are appreciated in advance.


    Eclipse CD3432 HU, Memphis ST3004 75 X 4 amp, CDT 6.5" classic components, CDT MS-80 sub, 2 Aura bass shakers...all in a 1999 Mazda Miata.

    "It takes a wise man to know what he does not know."

  2. #2
    skadude016's Avatar
    skadude016 is offline Veteran

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    Re: Technical question.

    in a perfect world sure. but in real world application your calculations and theories wont work. You are also not taking into account power compression of the woofer.

    HU:Kenwood Excelon KDC-889
    Speakers: CDT 61A's with rainbow x-overs
    Front amp: Autotek MM100.4
    Sub amp: (2) Audiopipe 1500's
    Subwoofers: (4) 15" Crunch GPV
    Box: 16 cubes tuned to 28hz (removable port)
    Extra Batt: C&D 139AH
    151.xx sealed up 154.xx in the kick

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