Help with porting my subwoofer box

[Daryl_89]

First off hello everyone and thanks in advance for any and all help. Now to my problem at hand I have attempted to use the calculators and programs but still don't understand porting and the subs im using doesn't give a whole lot of specs to go off of . My box is 12x20x36 an i would like to tune it around 34hz for my 2 gravity warzone 15's running on taramps smart 3k amp. Thanks again,

Daryl

[Joe X]

Ported boxes need to be much larger than sealed, the dimensions you provide are for about 3.8 cubic feet, enough for a single 15, a 15"sub will need between 3 and 4,5 cubic feet net depending on the specs of the sub which are not available apparently, if the subs work on ported, the manufacturer should be able to tell you the volume needed and from there you can figure the box they need, also remains to be seen if your vehicle can fit a 6 to 9 cubic feet net box, a SUV should be able to fit that box but no sedan will.

[Daryl_89]

Thanks for the response Joe I'm aware of the box being smaller than ideal and far as bigger box i could go taller an possibly wider slightly but not deeper (battery box with 2 batteries in the way) on a new box but was keeping it hidden beneath a cargo cover in the back of my 96 ford explorer(has all 2ga wires and 200amp ho alt)  with the current sealed box. Was wanting to toy with externally porting the current box being the speakers probably aren't the greatest but do well in the seal box with my 3k amp pushing them. Also here is the info that came with the speakers (tried my best but can't find anything else for them) you guessed it Amazon specials lol so no manufacturer to get any additional info or atleast I couldn't find anyone to contact.

[Joe X]

Actually there's enough information in that sheet to model the sub and the result is that those subs are specifically designed for sealed, the have a very high Q and an EBP of 41 which indicates sealed use strongly.

 

However the response curves do not rule out ported use in this case, 2.8 to 3 cubic feet per driver is indicated but tuned low, I suggest 32Hz and not much higher and a port area of 45 square inches per driver, that spec should let you play significantly louder while still sounding pleasing to the ear, porting your current box would result in losing the benefits of ported and the port itself would need to be very long to achieve low tuning and keep port area of adequate size. Your vehicle can support the box size needed and you can even build it yourself to the dimensions you like.

[Daryl_89]

Thanks again Joe, I'm gonna do some investigation on vehicle/box dimensions and see what i come up with. But also with you telling me sealed is highly recommended i might be better off leaving well enough alone if the box isn't too small. Also what did you use to model the subs with the provided info cause I tried winisd an couldn't get it to accept what I put in for some reason. Thanks again, Daryl 

[Tnicb3]

Hey Daryl_89 if you don’t mind me asking what did you end up building for this? 

[Joe X]

On 2/10/2025 at 2:39 PM, Daryl_89 said:

Thanks again Joe, I'm gonna do some investigation on vehicle/box dimensions and see what i come up with. But also with you telling me sealed is highly recommended i might be better off leaving well enough alone if the box isn't too small. Also what did you use to model the subs with the provided info cause I tried winisd an couldn't get it to accept what I put in for some reason. Thanks again, Daryl 

 

I usually use bassbox pro.

 

But even if the sub was designed for sealed it could be used for ported, normally is not the case but sometimes is possible, the advantage of ported is that it is much louder for the same power, the main disadvantage is a lager box size.

[Daryl_89]

Thanks again joe.Tnicb3  current box is sealed and built to nothing but what i was trying to accomplish of hiding it under the factory cargo area cover in my 96 ford explorer an having roughly 2 cubic foot of air per subwoofer. It's 12" tall 36" long and 20 inches deep and as controversial it may be has no divider so the subs are sharing the air space the box offers