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RE: Stiffer spider = lower sensitivity?

Posted by John Sheerin (A) on July 23, 2007 at 17:55:11

In Reply to: Stiffer spider = lower sensitivity? posted by Croc on July 23, 2007 at 13:43:48:

The efficiency of a transducer is not effected by compliance (spider and surround stiffness). Efficiency is controlled by BL, moving mass, and voice coil resistance.

A more complicated answer is that the stiffness of a spider effects the efficiency of a transducer at a given frequency around and below resonance by virtue of changing where the resonance is and what the Q of the resonance is. However, output in this range of frequencies is typically influenced heavily by box design / box resonance, so this range is not typically considered in asking about efficiency (or sensitivity). The typical assumption is that the box design will bring up the output level of the system to match the output level of the transducer in its piston band.

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