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<blockquote data-quote="tinmanchris217" data-source="post: 6266251" data-attributes="member: 610505">Please excuse any poor wordage... it is, in fact, friday night&nbsp; //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif1)&nbsp; Compliance - inverse of stiffness (like a spring).&nbsp; More compliance means that something has less resistance to moving.&nbsp; When I talk about air compliance, it means that the air is able to absorb alot of cone force without as much reaction force.&nbsp; High compliance = Floppy(ported).&nbsp; Low compliance = Punchy(sealed)2)&nbsp; 0.707 is the magic number for Q.&nbsp; It&#039;s the 1/2 * sqrt(2)... coming from the formula of 2nd order systems.w^2 / (1 + 2 * z * w + w^2) ... something like that... if you&#039;re an EE it&#039;s in one of your text books.Basic idea is that it&#039;s not too overdamped, not too underdamped... Critical damping is generally considered to be optimal response (with nothing else to optimize), since it has low rise time, and fast settling time.&nbsp; Critically damped is the best condition for a sealed woofer, in the perfect environment... but ported has alot more leniency... With either, you can tweak the system to give different response, but ported gives you twice the total output to fiddle with.3)&nbsp; What books do you(and others) recommend on the subject?&nbsp; I don&#039;t have enough reading material on the subject.</blockquote>

[QUOTE="tinmanchris217, post: 6266251, member: 610505"] Please excuse any poor wordage... it is, in fact, friday night [IMG]//content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif[/IMG] 1) [B]Compliance [/B]- inverse of stiffness (like a spring). More compliance means that something has less resistance to moving. When I talk about air compliance, it means that the air is able to absorb alot of cone force without as much reaction force. High compliance = Floppy(ported). Low compliance = Punchy(sealed) 2) [B]0.707[/B] is the magic number for Q. It's the 1/2 * sqrt(2)... coming from the formula of 2nd order systems. w^2 / (1 + 2 * z * w + w^2) ... something like that... if you're an EE it's in one of your text books. Basic idea is that it's not too overdamped, not too underdamped... Critical damping is generally considered to be optimal response (with nothing else to optimize), since it has low rise time, and fast settling time. Critically damped is the best condition for a sealed woofer, in the perfect environment... but ported has alot more leniency... With either, you can tweak the system to give different response, but ported gives you twice the total output to fiddle with. 3) What books do you(and others) recommend on the subject? I don't have enough reading material on the subject. [/QUOTE]

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