Sergeant_Skyrim Posted October 18, 2013 Report Share Posted October 18, 2013 Net volume is what your subs will actually be using. Gross volume is the volume of the ENTIRE enclosure, including sub displacement, net volume, port volume, bracing, etc. Net is what you have left over inside of the box after you take all of those out Build in progress Link to comment Share on other sites More sharing options...
Guest Posted October 18, 2013 Report Share Posted October 18, 2013 20Hx30Wx25D. 18.5" tall center port, 4" wide, 20" deep. 5.19cuft net (after displacements, not counting bracing), 36hz, with 14sqin of port per cube. this is barely under the minimum recommended specs for the woofer. increase depth to 27" and port width to 4.25", you get 5.73cuft at 35.4hz with 13.7sqin of port per cube. still slightly on the small side. Link to comment Share on other sites More sharing options...
gmsierra2000 Posted October 18, 2013 Author Report Share Posted October 18, 2013 so your saying I need a box 20"H x 30"W x 27"D, 18.5" tall center port, 4.25" wide port opening, by over all port length of 20"( this would mean no curves in the port correct??). you understand that this information I have presented to you above is per sub right? Link to comment Share on other sites More sharing options...
gmsierra2000 Posted October 18, 2013 Author Report Share Posted October 18, 2013 after entering the info in torres box cal, I get a gross vol: 5.03ft cube port opening: 2.5" port vol: 1.35 port length : 26.75" tune freq: 33.41 net vol: 3.13 ft cube woofer displacement set at : 0.547 box outside dimension: 30"W x 18"D x 20"H if I follow my "gross volume" as stated above for overall complete box then I am way over the suggested ported box size per sub which is 3.2 ft cube. do you guys agree? am I suppose to be looking at my net vol instead???? Link to comment Share on other sites More sharing options...
Guest Posted October 18, 2013 Report Share Posted October 18, 2013 so wait. you're making a box for 1 15 or 2? Link to comment Share on other sites More sharing options...
gmsierra2000 Posted October 19, 2013 Author Report Share Posted October 19, 2013 im trying to get the dimensions for 1 sub box so i can build it double to get a center port like this box. Link to comment Share on other sites More sharing options...
Guest Posted October 19, 2013 Report Share Posted October 19, 2013 you're confusing me. why are you wanting to just get the box specs for one sub, so you can double it? why not just make it easier and calculate everything out for BOTH subs at one time? its really not that difficult. you have to come up with 6 cubes net somehow. which is like 8-9 cubes gross. which i dont think should be too hard considering you have an extended cab with no rear seats. but then again, every vehicle is different. net volume is volume AFTER displacements. after port displacement. after sub displacement. after bracing displacement. gross volume is EMPTY box space. no displacements are taken into calculation here. think of it kind of as an empty sealed box. Link to comment Share on other sites More sharing options...
gmsierra2000 Posted October 19, 2013 Author Report Share Posted October 19, 2013 the reason i am trying to build it as a single box is because then i would know exactly how long each port over all length need to be. i am new to the port world and this will be my first port build. i dont want to confuse myself with building the box with dual port. and all these box calculators are placing the port either to the far left of the box or the far right of the box not center like i want. Link to comment Share on other sites More sharing options...
gmsierra2000 Posted October 19, 2013 Author Report Share Posted October 19, 2013 on the torren box cal. will my common port wall be 3 so i can have a port down the middle? this is what confusing me lol Link to comment Share on other sites More sharing options...
Krakin Posted October 19, 2013 Report Share Posted October 19, 2013 Common walls are how many edges of the box the port touches. A center port will only touch the top and bottom of the box, so it is a 2-common wall port. Krakin's Home Dipole Project http://www.stevemeadedesigns.com/board/topic/186153-krakins-dipole-project-new-reciever-in-rockford-science/#entry2772370 Krakin, are you some sort of mad scientist? I would have replied earlier, but I was measuring the output of my amp with a yardstick . . . What you hear is not the air pressure variation in itself but what has drawn your attention in the two streams of superimposed air pressure variations at your eardrums An acoustic event has dimensions of Time, Tone, Loudness and Space Everyone learns to render the 3-dimensional localization of sound based on the individual shape of their ears, thus no formula can achieve a definite effect for every listener. Link to comment Share on other sites More sharing options...
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