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<blockquote data-quote="yamomluvsme" data-source="post: 8673684" data-attributes="member: 676077">Orginally the SD was measured differently some companies used 1/2 the surround(when real accurate testing methods started to be implemented) and some used 1/4 of the surround(more accurate than 1/2 because those companies used linear roll surrounds which where the same height and width to provide a linear stiffness over stroke).. when I do build I use strictly a baseline of the actual diaphragm. Reason being is the diaphram creates a high and a low pressure that creates a pressurized &quot;wave&quot; of air. The surrounds do very very very little to aid in the linear piston stroke. Ideally you want just the piston to create the actual pressurization the surround adds nonlineariarites to the sound/wave. While piston area is definitely important more important is the woofers design and using it for it&#039;s intended purpose. Ie you can get that 15 to get loud as si.ilar 18s if you utilize it correctly. </blockquote>

[QUOTE="yamomluvsme, post: 8673684, member: 676077"] Orginally the SD was measured differently some companies used 1/2 the surround(when real accurate testing methods started to be implemented) and some used 1/4 of the surround(more accurate than 1/2 because those companies used linear roll surrounds which where the same height and width to provide a linear stiffness over stroke).. when I do build I use strictly a baseline of the actual diaphragm. Reason being is the diaphram creates a high and a low pressure that creates a pressurized "wave" of air. The surrounds do very very very little to aid in the linear piston stroke. Ideally you want just the piston to create the actual pressurization the surround adds nonlineariarites to the sound/wave. While piston area is definitely important more important is the woofers design and using it for it's intended purpose. Ie you can get that 15 to get loud as si.ilar 18s if you utilize it correctly. [/QUOTE]

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