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<blockquote data-quote="mr4pto" data-source="post: 13019" data-attributes="member: 541855">Your system has very good components in it.&nbsp; It is true that the smaller the box you have, the deeper the bass you will have, but it is also true the smaller the box you have, the lower your SPL will be, which is basically a measurement of how loud you system is.&nbsp; If you want to maximize your SPL, the best way is to use a vented box such as a virtual technologies box.&nbsp; These boxes when purchased are usually extremely expensive.&nbsp; Also some subs respond very poorly to vented boxes, for example I have seen Rockford subs really perform horribly in vented boxes (even blow quickly).&nbsp; I am not sure about the JL subs exactly . . . I build and i would suggest to you if you have any idea of what you are doing to build a box.&nbsp; I actually built a vented box for a jlw6 15&quot; and it performed VERY well in it so I have reason to believe that your 12s would probably do just fine.&nbsp; The other thing you have to worry about is space with a ported box because they are very big.&nbsp; What kind of vehicle do you have btw.&nbsp; Just to give you an idea of what a ported box can do, I had 2 Planet Audio P-129C running 375 watts each off of a Planet Audio Vector D in a custom box I built.&nbsp; I have a Ford Explorer.&nbsp; At the time I was metered I still had factory head unit and I metered 145.8 which took 1st place in my section of the competiton (2-12s 1-15 or 3-10s no wall).&nbsp; That beat out someone who had 6 RF HX2s (all sealed boxes) running 500 watts per sub in a station wagon like car... he hit 144 something.&nbsp; If you want volume go with a vented box, little less quality unless perfectly built for the sub is a problem.&nbsp; I must conclude though with my ode to sealed boxes . . .&nbsp; I now have a headunit in and lets say matured about car audio and am more into quality and now have 3 of those subs running in small sealed boxes running 350 watts each from the same amp (its stable to 1200X1 @ 1 ohm).&nbsp; Its probably not as loud spl wise but it sounds much better to most songs...&nbsp; email me if you want to know anything else, like box building stuff....I have a very solid design for 2 12s...email <a href="http://mailto:" target="_blank">gtg579b@prism.gatech.edu</a>..Later, Bob</blockquote>

[QUOTE="mr4pto, post: 13019, member: 541855"] Your system has very good components in it. It is true that the smaller the box you have, the deeper the bass you will have, but it is also true the smaller the box you have, the lower your SPL will be, which is basically a measurement of how loud you system is. If you want to maximize your SPL, the best way is to use a vented box such as a virtual technologies box. These boxes when purchased are usually extremely expensive. Also some subs respond very poorly to vented boxes, for example I have seen Rockford subs really perform horribly in vented boxes (even blow quickly). I am not sure about the JL subs exactly . . . I build and i would suggest to you if you have any idea of what you are doing to build a box. I actually built a vented box for a jlw6 15" and it performed VERY well in it so I have reason to believe that your 12s would probably do just fine. The other thing you have to worry about is space with a ported box because they are very big. What kind of vehicle do you have btw. Just to give you an idea of what a ported box can do, I had 2 Planet Audio P-129C running 375 watts each off of a Planet Audio Vector D in a custom box I built. I have a Ford Explorer. At the time I was metered I still had factory head unit and I metered 145.8 which took 1st place in my section of the competiton (2-12s 1-15 or 3-10s no wall). That beat out someone who had 6 RF HX2s (all sealed boxes) running 500 watts per sub in a station wagon like car... he hit 144 something. If you want volume go with a vented box, little less quality unless perfectly built for the sub is a problem. I must conclude though with my ode to sealed boxes . . . I now have a headunit in and lets say matured about car audio and am more into quality and now have 3 of those subs running in small sealed boxes running 350 watts each from the same amp (its stable to 1200X1 @ 1 ohm). Its probably not as loud spl wise but it sounds much better to most songs... email me if you want to know anything else, like box building stuff....I have a very solid design for 2 12s...email [URL="mailto:"]gtg579b@prism.gatech.edu[/URL].. Later, Bob [/QUOTE]

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