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Subwoofer Box Enclosure (Technical Questions, not "how do I make this")

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  • Subwoofer Box Enclosure (Technical Questions, not "how do I make this")

    Alright, I'm obviously making my own sub enclosure, as I love making my own stuff (pride, etc).

    I was looking at Rockford-Fosgate's website and noticed that the recommended enclosure volume for a sealed box is 0.65 cubic feet.... but I did the math and used various programs I found online and I got a value of 3336.29 cubic inches (which is roughly 1.93 cubic feet). That's more than double the volume... I dunno about you, but that's a huge difference!

    The only thing I can guess is that used a different value for Qtc... I was using the "default" .7, but in order for them to get their value, they must have used .96 as the value. (reversed and substituted some simple algebra to find this).

    So then, my question is... should I use their recommended volume or the one I calculated out (again, various times with different methods, so my math is right)?
    2004 Ford Mustang


  • #2
    Rockford is not dumb, i'd go with their specs. Although its most likely for a standard sub box you'd buy from car toys or best buy.

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    • #3
      rockford knows their sub better than any calculator.
      2007 Honda Fit Sport 1.5L SOHC-VTEC

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      • #4
        Alright, I'll sketch out design plans using my numbers and theirs, can't hurt.

        Another quick question involving how to harness the sides of the box:



        Yeah, which would be better assuming the front of the box is on the left side? I guess it's not a question about force, but rather vibration...
        2004 Ford Mustang

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        • #5
          I'm not sure what your actually mean but I don't think it would make a difference in which way you screw the boards together. In the pic on the right just turn the arrow up and its the samething as on the left then. Get what I mean??
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          • #6
            lol, true, here's a better image to explain (black represents the sub)

            2004 Ford Mustang

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            • #7
              It won't make a major difference which way you screw them together. I don't think the rockfords are going to putting so much force that you have to be worried about that. If your really woried put braces on each corner.
              Installed
              Asus A7N8X-VM - AMD Mobile Athlon 2400
              512 Ram - 60GB HD - Opus 150w
              Lilliput 7" - Rikaline 6010
              [00000000000001100010-] 98% Completed

              Check Out My Install!!!

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              • #8
                ok the force is going to be in all directions so it really doesnt matter anyways because unless your using nails and some really powerful sub and amp they both will work fine. Me personally i use the first method on everything that is MDF and not fiberglass.
                Cars
                1994 Mustang GT Punch 240.4 2 12" Kicker Comp SOLD :(

                2006 Suzuki Aerio Sx Kicker KX 650.4 RE 10

                2003 Eddie Bauer Expedition DVD - Navigation Package Traded in for 2008 XL-7 Limited

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                Planning

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                • #9
                  I don't think it matters either...


                  Where's Red anyway...?
                  Renault Megane...the OEM look

                  The Lost in Europe Ford Escort

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                  • #10
                    Makes no difference. Just make sure you get some Liquid Nails and "liquid" nail the seems.

                    Once dried, I'd question which is stronger!
                    Take my advice: Do not try to build a system that includes EVERY feature. Start with the basics, build it to a bug free state, and THEN add on.

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                    • #11
                      Originally posted by Will Albers
                      Makes no difference. Just make sure you get some Liquid Nails and "liquid" nail the seems.

                      Once dried, I'd question which is stronger!
                      Yeah, the screws/nails are only there to hold things in place while the construction adhesive dries. Personally, I use a pneumatic gun with 1.5" brads to tack things together -- boxes go together *really* quick that way.

                      -g.

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                      • #12
                        Space out your screws too, I hate seeing boxes where people screw every 1 inch - not necessary. Also, using a bit of sticky back weather foam from a hardware store around the rim of hte circles gives an absolute air-tight seal! Remember, sometimes manufactures call for small boxes based on a couple of things that might suite you. For one, they may be after more sq and you'd prefer the boom. For another, the smaller than enclosure recommended, the more marketable the product.
                        Its not the cards you're dealt, its how you play the hand!

                        Originally posted by ryuandwings
                        Where can I get a roll of tin foil?
                        I been looking for that all over the net, but I can't find it.
                        Please help.

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                        • #13
                          Originally posted by Will Albers
                          Makes no difference. Just make sure you get some Liquid Nails and "liquid" nail the seems.

                          Once dried, I'd question which is stronger!
                          glue should be stronger then the MDF itself if applied correctly. I would suggest the screws going into the face to fasten the face more tightly, allowing the glue to get a tighter seal.

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                          • #14
                            (your left-side version)

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                            • #15
                              in your right-side version, if the glue is not applied correctly(by no fault of your own) the screws could potentially crack. and the sub will start hopping freely all over the place with the front side MDF still screwed on just kidding.

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