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<blockquote data-quote="brian84corvette" data-source="post: 5350686" data-attributes="member: 586635">imagine it like thisa 12&quot; sub in a 1 cubic foot sealed box.moves in and out as far as it can &quot;stretch&quot; the air inside the boxwich is at 14.4 psi sea level atmospheric preassure,&nbsp; resting.when the sub hits,&nbsp; it moves fowards,&nbsp; causing air preassure inside the box to drop.letts say just for fun,&nbsp; sub has enough power to stretch the air to 12psi inside box.now put same sub in a box that is 2 cubic foot.same 14.4 psi inside box - sub can still stretch out the air when it moves out down to 12 psi.the sub has more &quot;throw&quot; / x max / excursion.....&nbsp; to make this happen.get it? - wait....&nbsp; maby I dont get it,&nbsp; hell its late.... hahahaha.so having small *** port = sub choked offlarge port is more like &quot;free air ish&quot; so sub can move to its maxamum&nbsp; - with out damageto the sub from over excursion is where tuning the box comes in to play.o crap -I also say go for the 18.I just got a re sx 18 and im giving it 1K /1100 rms.&nbsp;&nbsp; it kills my little *** car.not liking my box much,&nbsp; first go at it.going to build it in to a wall now.&nbsp;&nbsp; it should be insane.</blockquote>

[QUOTE="brian84corvette, post: 5350686, member: 586635"] imagine it like this a 12" sub in a 1 cubic foot sealed box. moves in and out as far as it can "stretch" the air inside the box wich is at 14.4 psi sea level atmospheric preassure, resting. when the sub hits, it moves fowards, causing air preassure inside the box to drop. letts say just for fun, sub has enough power to stretch the air to 12psi inside box. now put same sub in a box that is 2 cubic foot. same 14.4 psi inside box - sub can still stretch out the air when it moves out down to 12 psi. the sub has more "throw" / x max / excursion..... to make this happen. get it? - wait.... maby I dont get it, hell its late.... hahahaha. so having small *** port = sub choked off large port is more like "free air ish" so sub can move to its maxamum - with out damage to the sub from over excursion is where tuning the box comes in to play. o crap - I also say go for the 18. I just got a re sx 18 and im giving it 1K /1100 rms. it kills my little *** car. not liking my box much, first go at it. going to build it in to a wall now. it should be insane. [/QUOTE]

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