Torres Posted November 3, 2009 Report Share Posted November 3, 2009 make the box bigger but what are the max dimensions you have to work with for the box? so we can make sure it'll fit. Quote Link to comment Share on other sites More sharing options...
LoudBimmer Posted November 3, 2009 Author Report Share Posted November 3, 2009 40 W x 24 D x 20 H i can make a box 5 C.F. max Quote Link to comment Share on other sites More sharing options...
LoudBimmer Posted November 3, 2009 Author Report Share Posted November 3, 2009 i dont get it box volume- 30 x 24 x 17=12,240 cubic inch, 12,240/1728=7.0 cubic feet port size - 20 x 3 x 18.15=1,089 cubic inch, 1,089/1728=0.6 cubic feet ----------------- 6.4 cubic feet - sub displacement+wood displ =5.5 cubic feet Quote Link to comment Share on other sites More sharing options...
Torres Posted November 3, 2009 Report Share Posted November 3, 2009 20" high, 40" wide, and 18.5" deep, with a port that's 4" high by 20" wide and 24" deep. this will yield 5.58 cubic feet of net volume, tuned to 34 hz. that's about 14 sq inches of port per cubic foot. or if you wanted a lil less port area (to help the lows), you could do: 20" high, 40" wide, and 17.5" deep with a port that's 3.5" high by 20" wide and 20" deep. this will give you 5.49 cubic feet net, tuned to ~34.6 hz. with about 12.75 sq inches of port. Quote Link to comment Share on other sites More sharing options...
LoudBimmer Posted November 3, 2009 Author Report Share Posted November 3, 2009 20" high, 40" wide, and 17.5" deep with a port that's 3.5" high by 20" wide and 20" deep. this will give you 5.49 cubic feet net, tuned to ~34.6 hz. with about 12.75 sq inches of port. this is for 18" sub, with sub facing up and port facing back. Quote Link to comment Share on other sites More sharing options...
Torres Posted November 3, 2009 Report Share Posted November 3, 2009 i dont get itbox volume- 30 x 24 x 17=12,240 cubic inch, 12,240/1728=7.0 cubic feet port size - 20 x 3 x 18.15=1,089 cubic inch, 1,089/1728=0.6 cubic feet ----------------- 6.4 cubic feet - sub displacement+wood displ =5.5 cubic feet for box volume, the internal dimensions are 28.5 x 22.5 x 15.5. that's effective net volume after wood displacement. based on you using .75" wood. this gets you 5.7 cubic feet. now for the port, you have 3 x 20, but you need to account for wood also. so to figure actual port displacement, you need to do 21.5 * 3.75 * 19.65. (add in half of the port height for end correction) this gets you .92 cubic feet of displacement. and say ~ .2 for the sub. so now you have 5.7 - .9 - .2 which will get you ~4.6 cubic feet of net volume, not accounting for bracing Quote Link to comment Share on other sites More sharing options...
Torres Posted November 3, 2009 Report Share Posted November 3, 2009 this is for 18" sub, with sub facing up and port facing back. lol whoops! reading > me lol. lemme refigure Quote Link to comment Share on other sites More sharing options...
Decaf Posted November 3, 2009 Report Share Posted November 3, 2009 (edited) its .87cuft for port... u arent accounting for the wood... nor the end correction factor of using a slot port5.75 after wood displ -.22 for sub (guessed on displ) -.87 for port ______________ 4.66cuft@~37hz and u still arent accounting for bracing displacement... which is why i said 4.5@37hz+ for box volume, the internal dimensions are 28.5 x 22.5 x 15.5. that's effective net volume after wood displacement. based on you using .75" wood. this gets you 5.7 cubic feet.now for the port, you have 3 x 20, but you need to account for wood also. so to figure actual port displacement, you need to do 21.5 * 3.75 * 19.65. (add in half of the port height for end correction) this gets you .92 cubic feet of displacement. and say ~ .2 for the sub. so now you have 5.7 - .9 - .2 which will get you ~4.6 cubic feet of net volume, not accounting for bracing you can either believe two good box designers or follow ur math which is incorrect, lol Edited November 3, 2009 by Decaf Quote Link to comment Share on other sites More sharing options...
Torres Posted November 3, 2009 Report Share Posted November 3, 2009 is this going into an SUV i assume? i usually like mine as wide as possible, but to keep the depth and height as large as possible to fit it as far as mounting depth go and all, i had to shrink down the width a tad. i got 20" high, 37" wide, and 19" deep. port is 3.5" high, 20" wide, and 20" long. this will get ya 5.45 cubic feet tuned to 34.75 hz. with about 12.6 sq inches of port per cubic foot. with some bracing accounted for. Quote Link to comment Share on other sites More sharing options...
LoudBimmer Posted November 3, 2009 Author Report Share Posted November 3, 2009 you can either believe two good box designers or follow ur math which is incorrect, lol i believe you, i'm just trying to figure it out, which now i get it. right now it's going in suv, but i'm planning on getting another suv soon, so i'm trying to make the box fit this car and nest one i will get, so i'm trying to stay under 35" W and 20" D. height doesnt really matter. so, if i will make box 6.1 C.F. which will give me 6.1-.9-.2=5 C.F. right? Quote Link to comment Share on other sites More sharing options...
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