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post #1 of 11 (permalink) Old 08-10-02, 02:16 AM Thread Starter
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Ported box for two subs

I'm going to start planning the ported box for two subs, just wonderin whether I should make two seperate chambers or keep it as one box? I'm leaning towards two chambers coz I won't be gettin my second sub for a while and I wanna be able to use the box in the mean time. Any help would be appreciated.

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post #2 of 11 (permalink) Old 08-10-02, 04:46 AM
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From most articles i've ever read and advice i've heard, they all say 2 separate chambers is better. Hope its some help to ya! :)

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post #3 of 11 (permalink) Old 08-11-02, 04:12 AM
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What brand of sub's are you using?
What size box?
What power amp?
What does the manufacture suggest?

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post #4 of 11 (permalink) Old 08-11-02, 04:36 AM Thread Starter
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Specs

2 x 15inch Rockford Fosgate power HX2 subs.
1 x 1000bd Rockford Fosgate amp to start with, I'll be gettin 2 later on.
Around 70 litres each box.
The booklet does not say how I should make a box for two subs.
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post #5 of 11 (permalink) Old 08-12-02, 09:13 PM
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I advise you do seperate the chambers for two reasons.

1- You will be starting off with one sub, and this will save you making another box later.

2- Since it is a big box, the structure will be stronger, and there will be less flexing wood.

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post #6 of 11 (permalink) Old 08-12-02, 10:36 PM Thread Starter
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biggrin cool

Thanx, I'll definetily be using two chambers then
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post #7 of 11 (permalink) Old 07-01-03, 01:03 AM
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mate the phenonemon with using two chambers is to do with speaker failure. In other words...if one speaker blows it acts like a dead weight, giving the other working speaker with 2 times as much volume - which will kill it too as the suspension units wont work properly! It was all started with the pro audio market - where two speakers run at 4000wrms in one cabinet! People were blowing up speakers because one was blown by overdriving and the other by having no backpressure for the suspension units. As far as cabinet flexing goes - just put a brace in the centre of the box.
It doesnt make a noticeable difference to their performance at all...providing you're not going to be hammering them that loud that you'd have a chance of cooking them. Theres a million and one parameters that need to be met to make a nice box...but ill leave that fun to you!
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Last edited by 302_supra; 07-01-03 at 01:05 AM.
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post #8 of 11 (permalink) Old 07-01-03, 05:20 AM
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Re: Ported box for two subs

you could always go with an isobarik type setup..
JL audio have some good articles on sub box design.
http://www.jlaudio.com/tutorials/magic/isobarik.html
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post #9 of 11 (permalink) Old 07-01-03, 05:38 AM
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Isobarik is all ok but the design seriously stuffs up the sensitivity of the speakers in the enclosure. Plus you really gotta know what you are doing to make a good one...and they need a bigger box. Id say go for the conventional bass reflex box dude..nice n easy.
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post #10 of 11 (permalink) Old 07-01-03, 07:24 AM
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Re: Ported box for two subs

isobaric is old, no real benifit apart from smaller box size. Todays (good) subs with strong motors only require small boxes.

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Ill take it as a complement i think.............
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