new enclosure. doubkle check my math - Realm of Excursion



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Old 05-07-2011   #1 (permalink)
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Default new enclosure. doubkle check my math

ok my first idea wouldnt work due to poor trunk opening. my new box is just a normal rectangle. it measures 12"Hx36"Wx30"D. 3/4"mdf. i get a gross volume of 5.97. after subs displacement of .32. i get 5.65 and im gonna leave it sealed for right now. but eventually i will port it to 34hz. im using 2 15"L7s.
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Old 05-07-2011   #2 (permalink)
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Default Re: new enclosure. doubkle check my math

wont be anywhere near large enough to go ported for 2 l7 15's........ sealed it should do alright but if you take away more volume for the port you will wind up about half the size the l7's like
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Old 05-07-2011   #3 (permalink)
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Default Re: new enclosure. doubkle check my math

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wont be anywhere near large enough to go ported for 2 l7 15's........ sealed it should do alright but if you take away more volume for the port you will wind up about half the size the l7's like
What if he puts the ports on the outside of the box, will he still have enough room?
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Old 05-07-2011   #4 (permalink)
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Default Re: new enclosure. doubkle check my math

if they were 12's yes but the 15's need at least 3-3.5 each minimum....

think 18 round airspace since a 15 square is roughly the same or more...
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Old 05-07-2011   #5 (permalink)
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Default Re: new enclosure. doubkle check my math

as sic said even with port external he would be too small IMO to go ported. i have my round 15 in 3^ft3 and it is built for small boxes. the kicker L7 has quite a bit more sd than a round sub and is also not built for small boxes. if you want to go ported i would say that box is just about perfect for 1 15 after port displacement. just stick with sealed or get different subs.
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Old 05-07-2011   #6 (permalink)
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Default Re: new enclosure. doubkle check my math

L7's like big boxes, especially if you want to go ported. Kicker recommendes 3 - 6 cubes each and you can go over recommended spec. with out problems as long as your carefull. I'd have to agree with perfect_perfect and say 1 - L7 15 in that box if you'd like to go ported. I've used these subs many times in my customers cars and found 5 - 6 cubes each ported is the ticket.

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Old 05-08-2011   #7 (permalink)
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Default Re: new enclosure. doubkle check my math

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Originally Posted by HomeGrownCustom View Post
L7's like big boxes, especially if you want to go ported. Kicker recommendes 3 - 6 cubes each and you can go over recommended spec. with out problems as long as your carefull. I'd have to agree with perfect_perfect and say 1 - L7 15 in that box if you'd like to go ported. I've used these subs many times in my customers cars and found 5 - 6 cubes each ported is the ticket.
i didnt run any numbers or model anything on them and ive never specifically dealt with the L7's but i know the L5 15's absolutely love 6^ft3 apiece so i would have to agree with you on the 5-6 per comment
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Old 05-08-2011   #8 (permalink)
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Default Re: new enclosure. doubkle check my math

well if my trunk woulda been bigger than i wouldve went bigger. but as it is i had to almost Build the box inside the Car and had to remove the back seat to get it in and out. but thanks for the help though.
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Old 05-08-2011   #9 (permalink)
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Default Re: new enclosure. doubkle check my math

Well, the moral of the story here is that If you would like to stick with two subs then you should stick with a sealed enclosure. You really dont have the airspace to go ported if you want the subs to perform well across a wide frequency range. I'd assume if you bought the 15s you probably want to be able to go low. In order for those speakers to perform well in the lower frequency range you need a big ass box. Sealed boxes require less air space to get those low notes.

5 - 6 cu.ft. each ported is good for daily drivers because it keeps my customers in check (many of them don't understand restraint) I've put those 15's in 10 cu.ft. each ported, for customers who know how to control themselves, without a problem (in SUV's of course) and they will get low. but you don't have that kind of space.

So, your options to get the most out of your speakers is to either use 2 in a sealed box or use 1 in a ported box. If you port that box and still use 2 you may get a little bit louder than the sealed box but you will loose out on your low notes and 15's were made for low notes. If you like to get a little more output from your sealed box stuff some polyfill in there. I see it as more of a bandaid for boxes that are too small and would rather build the appropriate size enclosure but in your case if you can't build a bigger box, polyfill will make the speakers perform like thay are in a bigger box and will help you get louder lower performance. You'll be happier if you polyfill your sealed box than if you try to port it. My $0.02

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Old 05-08-2011   #10 (permalink)
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Default Re: new enclosure. doubkle check my math

Quote:
Originally Posted by HomeGrownCustom View Post
Well, the moral of the story here is that If you would like to stick with two subs then you should stick with a sealed enclosure. You really dont have the airspace to go ported if you want the subs to perform well across a wide frequency range. I'd assume if you bought the 15s you probably want to be able to go low. In order for those speakers to perform well in the lower frequency range you need a big ass box. Sealed boxes require less air space to get those low notes.

5 - 6 cu.ft. each ported is good for daily drivers because it keeps my customers in check (many of them don't understand restraint) I've put those 15's in 10 cu.ft. each ported, for customers who know how to control themselves, without a problem (in SUV's of course) and they will get low. but you don't have that kind of space.

So, your options to get the most out of your speakers is to either use 2 in a sealed box or use 1 in a ported box. If you port that box and still use 2 you may get a little bit louder than the sealed box but you will loose out on your low notes and 15's were made for low notes. If you like to get a little more output from your sealed box stuff some polyfill in there. I see it as more of a bandaid for boxes that are too small and would rather build the appropriate size enclosure but in your case if you can't build a bigger box, polyfill will make the speakers perform like thay are in a bigger box and will help you get louder lower performance. You'll be happier if you polyfill your sealed box than if you try to port it. My $0.02
thanks a bunch!!! i thought about usin polyfill too but wasnt sure about it. is the rule of thumb 1lb polyfill gains 1cu,ft? not sure anymore.
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