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Having a single box for a 15" JL Audio sub built

nichol01gp

nichol01gp

New member
OK so a guy is making me a single ported box for my 15" JL Audio sub. I dont really know what dimensions i should use, or cubic feet. I want to have really deep bass and as little as port noise as possible. Basically, i Just want this sub to hit hard and not lack sound quality. any help is appreciated. Thanks!
 


grab the model name/number off of the sub and google it for a spec sheet. You should be able to find how many cubes it needs as well as the dimensions.
 
You can go to JL Audio's website and get recommended specs for the box you need to build, or feel free to look up JL Audio on facebook and ask there. A lot of helpful/knowledgeable people willing to help out
 
^You're right Matt I shoulda worded that different ,basically go slot ported there is minimal to no port noise plus it helps the sub perform better.
 


The way iv'e always looked at it, is if you want LOUD, get slot ported. If you want louder, get bandpass, but they always sound like sh*t. If you want musical, Punchy bass, thats less boomy, go sealed.

If you put a sub in the right spec box, it can be almost/just as loud as a ported box, with better sound quality.
 
Slot ports are terrible for turbulence.

circular ports with flares fair better.

If you want a terribly insane peak at 40 Hz, go ported.

If you want to be able to hear each note at a somewhat similar sound level, try sealed.

Again, try modeling the boxes first.

you can make any style sound like anything you want with the right drivers and the right box.
 
Hey Matt,elaborate a little for me on what you mean by terrible for turbulence if you will bro,I've never heard that term used in car audio before.
 
Example:

Guy has a IB (infinite baffle, take Vas, multiply by 4, ideally 10, and that is the size of your box) setup in his attic.

Thought he should try LLT (large low tuned ported box) so he ran two 10" ports per bank of drivers and still had issues with turbulance as in, he could hear the air moving and it detracted from the sound quality.

Usually 27 m/s is your absolute max port velocity.

ideally lower...
 




AHHH! i got ya matt that makes since, i guess i've just alway's been a slot ported guy every since i've been putting sounds in my cars which have all been pontiacs, i guess it's just a matter of preference, slots just sound nominally better to me and the low end the slot catches is wonderfull,that's the setup i have in the GTP right now 1 15 inch sub in a slot ported box built over specs (not a whole lot over) and a 1500 wtt amp and i can knock earings out ya ear with it,but you make alot of since in what you said sir that is definately something to consider.
 
I've always liked the sealed myself but the slotted tuned boxes sound interesting. There was a guy back when i was in HS that had 4 Pioneer Premier 12's running off memphis gold amps in a Plymouth Breeze with a home built slotted setup. Loudest damn car i've ever rode in or heard. Crazy Loud!
 
I love'em honestly but it really is a matter of preference to what you like your sounds to sound like,it is definately worth trying you just might wanna make sure the person who builds the box doe's it for the love of the sounds and not the love of the money. I can definately believe that ryno, i saw a guy with 4 alpine type r's in a chevy caprice with 4 of the alpine 1000's interlinked running to them in a slot ported box and let me tell you i sat in the car for maybe a total of 45 seconds before i started feeling sick to my stomach,so yeah i can definately say slot ported doe's do wonderful as well as circle ports and sealed.
 
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