How do you do this, I just recently was notified of this, and now I'm trying to figure it out. Should I call the sub manufacturer? They were very helpful yesterday when I gave them a call about rec. box volume. Once I have this figure, do I just add it to the cu. feet measurement while calculating outer dimensions here? http://www.customcarsound.com/calc_box.html I'm not going to start building until next week, so I am getting everything together now. Measurements, volume, etc.... Help me out guys? Please?,,,,98

 

I think you'll find this link a lot more helpful:
http://www.eatel.net/~amptech/elecdisc/caraudio.htm

Scroll down to "speaker enclosures". It provides you with a "fill in the blank" calculator to get you to the proper dimensions. Lots of other useful info, too.

 

Are you trying to figure out the displacement of the sub itself inside the box? The manufacturer or the spec. sheet will tell you that. It's subtracted from the internal air space volume.rockfordfosgate
Go to RF Tech, then volume calculator and just fill in the blanks, giving your outside demensions and thickness of material. You can do it with Fosgate subs in cluded or without and just subtract your brand of speakers displacement.

 

oops

 

Hey guys,
Sorry I didn't reply to your post sundog. That site is now in my favorites!! Very Helpful!! A few things I read on there went too technical on me, but it's a great site! You guys are a great help! The only reason I was saying add the woofer displacement was because of the way that calculator on that site worked. You give two outside measurements that fit in your vehicle, and the cubic ft. you want the box to be, and it gives you the third dimension. Does that make sense, even? It's only a little confusing to me now, it was thoroughly confusing. I'm finding out my cheap box is smaller than I thought it was, not to mention having thin walls What is the term used for woofer displacement in the sub specs?? I don't see anything that looks right. Thanks again for your help guys, I want to get this right the first time.,,,,,98

 

I think I've found the solution! I went to www.subbox.net , and they now have a dual 10" downfiring sub box, that allows the seat to fold down. It comes with the seat lift kit and box, for $149!! Thank you for all your help
guys!,,,,98

 

If you want to fig cu. ft. lenth x width x hieght divided by 1728 wich is half of pie. For an exp. lets say your box was 60in long 5in wide and 10 in tall, your cu feet would be roughly 1.7cu feet, If you have a box thats wider at the bottom and narrow at the top take the two measurements and add them together and divede by 2 use this no. for width. hope this helps. remember math is are friend.

 

mr2x75, don't mean to rain on your parade, but 1728 is 1^3 ft. 12x12x12=1728, not half of pi (3.14)

 

Thanks for the math The sub box I was looking at will not let the seat fold down. Back to the drawing board,,,,98

 

98, you should not have to worry about the volume the sub takes up. The manufacturer accounts for this in their reccomended box size. If your box volume falls in the reccommended range you will be fine.