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<blockquote data-quote="Relax" data-source="post: 2425000" data-attributes="member: 571303">First off, Xmax, Xmech, and Xsus are all measured one way from the subs natural resting point.&nbsp; Xmech is usually limited in how far back the subwoofer&#039;s cone will travel, there happens to be large metal plates in the way- going forward however, there is little other then a spider and surround, which usually allow for more then Xmech travel anyways.Next- anytime you are worring about mm of clearnace infront of a sub you have a bad design for several reasons.&nbsp; First among those reasons is the loading effect the subwoofer will experience when played.&nbsp; The loading of the cone will alter the performance of the sub enough that its predicted response in any enclosure you design will be altered.&nbsp; Next is the possiblity anything goes wrong.&nbsp; As soon as the subwoofer travels past the the clearance you ahve set aside, it will hit a ver solid object and it will die.&nbsp; The voicecoil will jam into the gap it rides in normally, and the sub will be broken.&nbsp; Why even risk it.If you do have your heart set on slamming your sub up against some plexi glass- go with Xmech measured from the forward most part of your sub (probably the surround&#039;s apex).</blockquote>

[QUOTE="Relax, post: 2425000, member: 571303"] First off, Xmax, Xmech, and Xsus are all measured one way from the subs natural resting point. Xmech is usually limited in how far back the subwoofer's cone will travel, there happens to be large metal plates in the way- going forward however, there is little other then a spider and surround, which usually allow for more then Xmech travel anyways. Next- anytime you are worring about mm of clearnace infront of a sub you have a bad design for several reasons. First among those reasons is the loading effect the subwoofer will experience when played. The loading of the cone will alter the performance of the sub enough that its predicted response in any enclosure you design will be altered. Next is the possiblity anything goes wrong. As soon as the subwoofer travels past the the clearance you ahve set aside, it will hit a ver solid object and it will die. The voicecoil will jam into the gap it rides in normally, and the sub will be broken. Why even risk it. If you do have your heart set on slamming your sub up against some plexi glass- go with Xmech measured from the forward most part of your sub (probably the surround's apex). [/QUOTE]

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