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Re: i need help
Put this in google -- ported box software
Now, you will need multiple specs for your subwoofers to figure out the correct box size and port diameters/length.
Also, other calculations like the resonant frequency of the vehicle you are putting these in and numerous other issues. Seriously, fixya.com is the wrong place to get this answered. Teams spends tens of thousands of dollars and years perfecting their vehicles to compete. Go to a good audio forum and ask this question there. You will receive ALOT better help and you can interact with some very knowledgeable people about your competition wishes. Good luck and have patience!!
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These subs are the (AW1251SE). Go to the Audiobahn website and look up the specs. I have included a hyperlink that will take you to the correct page. Find the model number and download the PDF. Inside the PDF file it will have every parameter listed, I already looked at it and made sure. It also has different enclosure options and gives the specs for each one. http://audiobahn.com/index.php/help/tech-support/manuals/category/6-subwoofers.html
MA Audio's website has the recommended box volume and port size online here. A ported enclosure needs 3.0 CuFt of internal volume and the port should be 48 sq/in and 14.5" in length. A 4X12" rectangular port would give you the recommended 48 sq/in. Using 3/4" MDF, a box 16X18X25 has an internal volume of 3.25 CuFt allowing .25 CuFt for the sub and port displacement.
I used to be an Audiobahn dealer and can help you with the box. However I can't find specs on that model in my records or on Audiobahn's website. If you email me (firstname.lastname@example.org) the Theile Small parameters for the subs I can give you more exact specs. The box should be ported (Audiobahn doesn't recomend a sealded box) with about 2.5 cubic feet, made of 3/4" MDF. Here are some generic specs that should go well with that particular sub. Air Space (Cu. Ft.) 2.4
Try going to Alpine web site, I think they have box building program as well that you just input your sub models into and it gives you blueprints for various types of enclosures. I know Rockford has one and a comparative attachment to compare equipt specs. Or if you call Alpine headquarters you may be able to get info that way, I once sweet talked a rep @ a demo vehicle I met doing some car shows that turned me on to a senior rep @ Korbon Trading the owners of Rockford Fosgate and they gave me specs for a 5 stage band pass box for some competition subs that was more intricate and detailed than anyone before that could find me, Won me first place in spl. Matching your box specs to your subs is crucial and the best specs are often kept a secret for demo competition vehicles! So ask around with some competition guys or other top experts if your real serious about your boooom.
Contact company the can send you diagrams or go to a stero stop they should be able to help because some shop have wire diagrams for best way to get the most thump in you r trunk.Make sure you know the ohms your subs is 1-2-4 ohms.Should say on the back of your sub and how many contacts are on in two or four.
It all depends on the manufacturer's specs. For instance memphis makes a bunch of different 12" subs and each needs a different box. Also It depends on what kind of sound you want. If you want precise bass I would go with a sealed box. If you want loud then I would go with a ported box. Then the port depends on what the manufacturer recommends. what I would do is find their website or just a tech support phone number and get specs from them. If there is one place that can tell you a good box, it is the maker of the subwoofer. If you need help from there just let me know and I would be happy to help.