box idea for 2 Re re 12's

[tj'sProbe 10+ year member]

I came up with 14"deep, 14"high, and 35" wide and that came to 3.029^3ft. Would that be ok. Also can someone come up with the size of my port i am doing a slot port and would like to stay at 32hz because that is what my box is now.

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[joeldirt 10+ year member]

It's not a crime to build a box with a single chamber for two subs. But it is prefered when aplicable to have an individual chamber per sub because first of all, it provides internal bracing to reduce vibration and panel flexing.... Each subwoofer should have its own chamber any way since its kind of like a circuit protection measure. a fuse is geared to blow when the current exceeds its rating so that you do not start an electrical fire inside your vehicle. The center baffle produces a prtection against ruining your second speaker if the first happens to quit working for any reason... if this happens, you now only have one sub pushing air and it is working in a double sized enclosure... IT would do one of two things... sound like complete ***.... ( that owuld atleast give you an indication that somthign is seriously wrong) or it would damage your second sub when it normally would have been protected....... Not to mention, that even though you may be using two of the exact same subs, they may perform differently. By giving a spereate chamber, you isolate each sub from eachother..... YOu will have a much better sounding box as an end result...... Hope this advice is somewhat helpfull for you. //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

 

[tj'sProbe 10+ year member]

yea that totally makes since. Does anyone have a plan that i could use for a box or know where i can get one? it would be very helpful. thank you very much.

 

[joeldirt 10+ year member]

yea that totally makes since. Does anyone have a plan that i could use for a box or know where i can get one? it would be very helpful. thank you very much.

I'm working with a guy on here to build a box for two SE12's. his dimensions are 29x29x16... that is for a honda CRX... each chamber is 3.08 befor displacement. After internal bracin g, port displacement, sna sub displacement, we will have 2.5 tuned to 35hz ea. THat box is for two SE's, but I am sure it will suit your RE's just fine as well. YOu can tune it to anything you want. That box may be too bigf for your car though

 

[tj'sProbe 10+ year member]

yea. Boy is it hard to find someone that has box plans for them. I know there has to be 10 people in here with 2 re 12's come on someone help me out lol.

 

[joeldirt 10+ year member]

I can help you out. I'll work on it tonight..... yeah for free. just give me your max dimensions, and what oyu wish the box to be tuned to. also let me know what tools you have access to, and how you want the box finishd.

pm me the details if you want

 

[tj'sProbe 10+ year member]

Max Dimensions are 17"H x 35"W x 19"D, i like the way mine is tuned to 32hz so probably keep this one there to. I have access to all tools pretty much. And i am just going to keep the wood look.

 

[joeldirt 10+ year member]

Max Dimensions are 17"H x 35"W x 19"D' date=' i like the way mine is tuned to 32hz so probably keep this one there to. I have access to all tools pretty much. And i am just going to keep the wood look.[/quote']

okay good dimensions for your sub. now do you want round or slot ports?

 

[tj'sProbe 10+ year member]

differently slot ported

 

[swimfreak26 10+ year member]

It's not a crime to build a box with a single chamber for two subs. But it is prefered when aplicable to have an individual chamber per sub because first of all, it provides internal bracing to reduce vibration and panel flexing.... Each subwoofer should have its own chamber any way since its kind of like a circuit protection measure.

When using sealed it's generally worth the time to have separate chambers, but ported it is very common to do a common chamber. It does not affect sound, and is easier to design, along with using a ton less space.

 

[tj'sProbe 10+ year member]

i dont know much about seperate chambers. All i know is i have build 3 boxes in my life 2 sealed and one ported. The last two i love. the first one well lol. I am in need of a new box since i purchased another sub. So i need plas how i can start building. Also how much of a difference will i notice by adding another sub? Will it be much different or no. Thanks guys.

 

[joeldirt 10+ year member]

When using sealed it's generally worth the time to have separate chambers, but ported it is very common to do a common chamber. It does not affect sound, and is easier to design, along with using a ton less space.

You ought to read into things a little further. There is a reason for the PREFERABLE option of giving each sub its own chamber. rather then what is COMMON. Because what is common, is a production style cheaply designed and built enclosure.... YOu are right about how common it is... IT is extreamly common. People don't pay attention to details and go for what is easiest. They could have a box that performs well..... until once somthing for some odd reason happens like a sub fails to perform any more and decides to quite. then you have only one sub pushing the air and it would then be out of tune. Not to mention your average person doesnt know the difference between a good sounding box and a GREAT sounding box. They generally go for looks, and price..... always price.... That is where car audio business men make their money because they know this. People will pay alot for mediocrity, as long as it looks good. And it takes the fabricator less time and effort to build the box. THis is why it is so Common...

First, the devider provides reinforcement. the bracing is always a plus.

Second, each driver though it is the same brand and model perform slightly differently. By giving a seperate chamber, you isolate one from the other to prevent resonant friction between the two.

third, if you run your subs in stereo mode rather then mono

fourth, incase one sub fails.... you will only end up with one sub that is damaged rather then two.

the seperate chamber gives additional suport and isolates the subs from eachother

It's all proven and tested.... Yes it is common to have more then one sub per enclosure. you often find them in sealed fiberglass enclosures. They are for looks, and they cost alot of money, and they often sound okay. However they would actually sound alot better, given the subs are built to their own seperate chamber. (you can still do this while giving the same exact shape as the box without the internal deviders. Takes more time, but produces better cleaner sound quality, frequency response, and over all SPL since you have a much more sturdy box with the subs playing in exactly their intended box volume........

And last but not least, if your system is a couple 200 RMS pioneer or Kenwood 12's. then this isnt that big of a deal.... THis guy has a couple really nice subs. he ought to compliment them with a solid *** box.

Arguments will fly out from this one! I can't wiat to hear it.......

lets discuss.

 

[InhumanAcura 5,000+ posts]

It's all proven and tested....

link?

 

[SPL140.2 5,000+ posts]

However they would actually sound alot better, given the subs are built to their own seperate chamber. (you can still do this while giving the same exact shape as the box without the internal deviders. Takes more time, but produces better cleaner sound quality, frequency response, and over all SPL since you have a much more sturdy box with the subs playing in exactly their intended box volume........

I dont use the recommended box volume suggested by the manufactures. I use a larger box due to efficiency. I dont use the recommended port size either, i use a bigger port. I dont use internal dividers, i brace it with 1" wooden dowels. I give my enclosure a slot loaded port and that also helps with bracing. I dont think, well I know it wouldnt get better spl. Have tried both types of boxes and having 2 subs in the same chamber produces more spl because they share the same port. Puts a lot of pressure to the one port. Not dissen what you said but id agree to disagree. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[joeldirt 10+ year member]

link?

how can you post a link from your own personal experiences in differences of the two?

but for reinforceing reference, read some books by Joe Pettit, or Mark Rumreich. The best way is to build two enclosures and note the SIGNIFIGANT difference. build them with one chamber for two.... then devide the exact volume in half and build two seperate chambers tune the boxes exactly the same.....

Come on man.... if you think about it.... I mean you don't have to strain your brain to think about this one....... Realize the mechanical theory behind sound reproduction. Note where the losses in SPL or sound quality come from in an enclosure. It only makes sence any way.