If a box is a little small for the sub will porting make a positive difference or negitive?

 

What do you mean by to small? To little airspace? Not deep enough explain the situation a little more and i could possibly help you out

 

Yeah the airspace is a little too small

 

If there is not enough airspace the bass may sound slighty distorted and definatly it will not be as loud as the sub can be. If it is not under by much it will barely make a difference i had an 88 f-150 reg cab and had to custom make a box but there was not enough airspace. It didnt distort it sounded good it just wasnt as loud as now with the right size box. I would say just leave the box if you port it you will loose airspace. If you put the sub in and it sounds distorted the only thing to do is get a new box.

 

New box would be my suggestion as well...

 

add a little polyfill to the box.. it'll let the box feel a little bigger for the sub. porting the box wont do anything for the box, size-wise. you'd have to first look at the sub to see if it's even usable in a ported box, then go from there. but, i'd say add a little fill.. if that dont work, build a new box. don't port it.

 

Yeah I was afriaid I'd have to build the box a little bigger but it fits sooo well where my jumper seats used to be. I guess I could just extend it out a little. Thanks

 

If you get distortion from your speakers its now becuase of a small box, a small box will just get you slightly higher SPL numbers. The problem is the standing waves in the box. If your speaker back is facing a flat surface underneath, certain waves will bounce back up to the cone causing distortion. You need to put some type of sound diffusor behind the speaker. Cascade audio makes them, Dynamat makes them, or you could use some "egg crate" foam from www.partsexpress.com behind the speaker.

 

So there would be a benefit to lining the interior of a box with dynamat? I've always wondered this...I'm still kinda new to the whole "sound deadening" thing. I've never had a vehicle rattle this friggin' much before! lol

 

lining the box with dynamat wont help you in your case with the box being too small. easiest thing to try first is to add acoustical stuffing, like i mentioned a couple days ago. it slows down the waves within the box, allowing the speaker to feel like it's in a slightly larger box. try it out, it will help. (unless the box you're using is wayyyyyy too small)

 

and you unfortunately can't take a sealed enclosure and stick a hole in it and have it suddenly become a better, ported box. ported enclosures generally have completely different box volume requirements than sealed boxes for the same sub, as well as recommended port sizes designed to tune to a specific hz.

if the accoustic stuffing/polyfil doesnt help, i'd say your only other option is building a new box (or rebuilding the current one, if its feasible).

 

this is just pillow stuffing...pillow fluff....dream snow...

u're grandparents or a craft store will have this...its like 96 cents for a bag enough to fill a big box

 

Well I posted a thread this morning, but I guess it didn't go through... But what it said was that putting sound deadening IN your box won't do anything. Well, it might help seal it better, but nothing else. What I was suggesting is something totally different... it's a sound diffuser, it disperses the sound waves from hitting the back of your speaker's cone and helps clean up the distortion. Here's a couple links:

http://www.partsexpress.com/pe/showd...number=268-244

http://www.partsexpress.com/pe/showd...number=260-516

Hope this helps out a little.

 

those would work for distortion and all.. but its not what he's needing if the box is simply too small.


but yeah, you're responding to dangerranger's post about probable distortion, and i didnt notice . so my previous posts about not needing dynamat for (coolkatz) case was not pointed at the right person.. i for some reason didnt notice coolkatz wasn't twofinhogie, lol.

 

we're cool, man.

 

There is a possibility that the box could be way too small, like a .9 or above Qtc. But this post could have been started out by asking what subs and what the approximate volume of the box is and that probably would have helped out a little more. So, what subs are you using and what is the approximate volume of the enclosure?

 

Alright I made my boxes larger so now the speakers have plenty of airspace, but I was woundering if I were to reverse the speakers so the cones faced into the box would they be as loud as if I were to mount them regularly?

 

mounting the subs with the cone facing inward is done to allow the box to use all of it's volume. if your box was just slightly too small, you could have reverse mounted the subs to gain back that airspace within. it wont help with any dB gain, it would only allow the box to be slightly larger. (i would have mentioned that possibilty earlier, but i thought they were going under the jump seats, so i figured mounting them like that would have only gotten in the way.) good to hear you built them a little bigger.