OrenB217 Posted August 29, 2011 Report Share Posted August 29, 2011 Hey, I am thinking about doing a new box for 2 sundown nightshade 15s in the trunk of my maxima "subs/port firing forward sealed off from trunk". I've been messing with numbers trying to get around 100 sq inches of port, tune to 32 hz, and keep it around 6 to 6.5 cubes, but i am wanting a center slot "L" port and cant figure out how to calculate it when its in the center. To give you an idea of my trunk, i cant go past 40 inches wide, 17.5 tall, or 28 depth and i will be using mdf wood, double baffle, woofer displacement is .2 per woofer, and i plan to just glass the whole box on the inside and use the center port as the bracing. Any help would be appreciated Quote Black 1998 Nissan Maxima1st Setup: 145.8 DB Outlaw @37 HZ On Music Out Of Trunk2nd Setup: 147.8 DB @42 HZ On Music Out The TrunkCurrent Trunk Build:153.8 DB Outlaw @ 49 HZ Out the trunk (150.8 DB Sealed)Team gg. Link to comment Share on other sites More sharing options...
6berry Posted August 29, 2011 Report Share Posted August 29, 2011 to calculate a center port you would measure down the center of the port from the front to 1/2 into the bend and then from that point to the end of the wood. Quote 1999 Audi A4 1.8T::: 4 - DC Level 3 10's in a 4th order Rockford P6002 on Subs for now (3-3.5k coming eventually) MB Quart ONX4.60 for Mids and Highs Boston S50 Components in Front Boston S65 Coaxials in Rear 40 Sq Ft of Second Skin Damplifier Build Thread UBL 1948 Plymouth Link to comment Share on other sites More sharing options...
BJD3 Posted August 29, 2011 Report Share Posted August 29, 2011 It also has two common walls. Quote Anti Peel and Seal...lol You may be offended by the above. Don't take it personally, I'm just abrasive. 2002 Buick Park Avenue DC Level 4 M2 12 D2 Car Audio Bargain 1600.1 Eclipse CD3200 ~2 cubes @ 34 hz. Stinger Roadkill Expert Link to comment Share on other sites More sharing options...
zx10intn Posted August 29, 2011 Report Share Posted August 29, 2011 Just measure down the center, even if it turns 15x, keep measuring down the center and you can't mess it up Quote 1969 Chevy Chevelle 20/22" staggered Bonspeed Huntingtons wrapped in Nitto INVO's Mechman 250amp cs144 alt w/AVBM Kinetik 1800 main battery/Kinetik 2400 in the trunk Pioneer AVH-3200dvd Headunit (2) sets of Hybrid Audio Technologies Imagine components up front (2) DD 3512's d4 coils Sundown sax100.4 component amp Sundown saz-3000d subwoofer amp 5ft^3 box tuned to 34hz MY BUILD Link to comment Share on other sites More sharing options...
OrenB217 Posted August 29, 2011 Author Report Share Posted August 29, 2011 ok i kinda get it now, but here are the numbers i got, i just dont know the cutlist for the port(s) it says N/A Quote Black 1998 Nissan Maxima1st Setup: 145.8 DB Outlaw @37 HZ On Music Out Of Trunk2nd Setup: 147.8 DB @42 HZ On Music Out The TrunkCurrent Trunk Build:153.8 DB Outlaw @ 49 HZ Out the trunk (150.8 DB Sealed)Team gg. Link to comment Share on other sites More sharing options...
zx10intn Posted August 29, 2011 Report Share Posted August 29, 2011 Think of it this way, if your port was 3" wide, each 90deg bend would have 3" of length in the bend, then add the length of the walls for total length Quote 1969 Chevy Chevelle 20/22" staggered Bonspeed Huntingtons wrapped in Nitto INVO's Mechman 250amp cs144 alt w/AVBM Kinetik 1800 main battery/Kinetik 2400 in the trunk Pioneer AVH-3200dvd Headunit (2) sets of Hybrid Audio Technologies Imagine components up front (2) DD 3512's d4 coils Sundown sax100.4 component amp Sundown saz-3000d subwoofer amp 5ft^3 box tuned to 34hz MY BUILD Link to comment Share on other sites More sharing options...
zx10intn Posted August 29, 2011 Report Share Posted August 29, 2011 (edited) On other words, with a 7.5" port that's 33" long, you should have 25.5" of inside port wall length(with one 90deg bend) if using a side of the box and front or rear as the outer port wall Edited August 29, 2011 by zx10intn Quote 1969 Chevy Chevelle 20/22" staggered Bonspeed Huntingtons wrapped in Nitto INVO's Mechman 250amp cs144 alt w/AVBM Kinetik 1800 main battery/Kinetik 2400 in the trunk Pioneer AVH-3200dvd Headunit (2) sets of Hybrid Audio Technologies Imagine components up front (2) DD 3512's d4 coils Sundown sax100.4 component amp Sundown saz-3000d subwoofer amp 5ft^3 box tuned to 34hz MY BUILD Link to comment Share on other sites More sharing options...
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