lotus Posted January 12, 2012 Report Share Posted January 12, 2012 (edited) my box dimentions are 33width x 15high x 25long and my port is 4.5wide x 13.5high and i want it tuned to 32hz. what should the port length be? Edited January 12, 2012 by lotus Quote 2010 Cobalt LT Coupe Subs: 2 American bass XFL 12s Amp: Crescendo BC3500D Big 3 in 1/0awg 29hz box stinger volt meter 2nd battery Deka 9a31 pioneer DEH-9400BH Link to comment Share on other sites More sharing options...
CleanSierra Posted January 12, 2012 Report Share Posted January 12, 2012 (edited) Port length of 25inches puts you at 32.39 before displacement of subs or bracing. That's total port length too, so if it bends, which it does, you add the length together Edited January 12, 2012 by CleanSierra Quote Im not the one you want to try to troll. Just a fyi for you. Link to comment Share on other sites More sharing options...
lotus Posted January 12, 2012 Author Report Share Posted January 12, 2012 Port length of 25inches puts you at 32.39 before displacement of subs or bracing. That's total port length too, so if it bends, which it does, you add the length together do u calculate the subs displacement also for tuning? Quote 2010 Cobalt LT Coupe Subs: 2 American bass XFL 12s Amp: Crescendo BC3500D Big 3 in 1/0awg 29hz box stinger volt meter 2nd battery Deka 9a31 pioneer DEH-9400BH Link to comment Share on other sites More sharing options...
jeremyg Posted January 12, 2012 Report Share Posted January 12, 2012 Yup, all displacement needs to be taken into account. Quote Google+ Profile Link to comment Share on other sites More sharing options...
lotus Posted January 12, 2012 Author Report Share Posted January 12, 2012 Yup, all displacement needs to be taken into account. so if i want 32hz how will i get it exact? i have 2 12" XDs and useing 3/4" MDF Quote 2010 Cobalt LT Coupe Subs: 2 American bass XFL 12s Amp: Crescendo BC3500D Big 3 in 1/0awg 29hz box stinger volt meter 2nd battery Deka 9a31 pioneer DEH-9400BH Link to comment Share on other sites More sharing options...
Smoove Posted January 12, 2012 Report Share Posted January 12, 2012 You should take a look at the Torres box calc. It will help you answer a lot of your questions. Quote 2 Team Fi 15's v1 2 DD M5's 970amps of Alt 6th order blowthroughThe truck Blowthrough build : http://www.stevemeadedesigns.com/board/topic/155555-smooves-1996-chevy-ext-cab-c1500-slow-build/The 350z build : http://www.stevemeadedesigns.com/board/topic/170694-smooves-2003-nissan-350z/ My FB page https://www.facebook.com/pages/Smooves-Car-Audio-and-performance/719746144805343 Team Fi Audio http://www.ficaraudio.com/ Link to comment Share on other sites More sharing options...
Subsonicwhat Posted January 12, 2012 Report Share Posted January 12, 2012 (edited) Two 4in aero ports 8 inches long tunes you to 32.4 Partsexpress.com sells them ultra cheap. hella easy to install #Problem solved Ohhh and i did this on torres calc Edited January 12, 2012 by Subsonicwhat Quote Link to comment Share on other sites More sharing options...
CleanSierra Posted January 12, 2012 Report Share Posted January 12, 2012 A 12" roughly displaces .14 cubes of air. Two of them is .28 cubic inches. 27 or 28 inches of port length corrects for the displacement of the subs. It also gives you 14 sq inches of port per cubic foot, which is solid. Quote Im not the one you want to try to troll. Just a fyi for you. Link to comment Share on other sites More sharing options...
lotus Posted January 12, 2012 Author Report Share Posted January 12, 2012 A 12" roughly displaces .14 cubes of air. Two of them is .28 cubic inches. 27 or 28 inches of port length corrects for the displacement of the subs. It also gives you 14 sq inches of port per cubic foot, which is solid. okay so i get about 5.4cu, so for a tuning of 32hz i should just go 27 then Quote 2010 Cobalt LT Coupe Subs: 2 American bass XFL 12s Amp: Crescendo BC3500D Big 3 in 1/0awg 29hz box stinger volt meter 2nd battery Deka 9a31 pioneer DEH-9400BH Link to comment Share on other sites More sharing options...
Joe X Posted January 12, 2012 Report Share Posted January 12, 2012 Based on a 0.14 cubic feet driver displacement and 2 drivers you can build on these dimensions: Enclosure Specifications: Fb = 32,0 Hz Vb = 4,257 ft^3 External Height = 15 in External Width = 33 in External Depth = 25 in Port Width = 4 3/4 in Cut List: * All Dimensions in Inches. * Wood Thickness is 3/4 for all Parts. External Enclosure Parts: Front & Back = 33 x 15 Left & Right Sides = 23 1/2 x 13 1/2 Top & Bottom = 33 x 23 1/2 L Port Internal Assembly Parts: Front to Back = 18 3/4 x 13 1/2 Extension = 5 1/2 x 13 1/2 I used a slightly wider port get passed the corner of the box since it was rather near to the back wall. Quote Link to comment Share on other sites More sharing options...
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