IndianaBassHead Posted August 10, 2012 Report Share Posted August 10, 2012 What's up everybody? Just got done talking to nick at Obsidian Audio and I'm ording 6 obsidian 18's this weekend. I will be doing subs up/port back in my tahoe. It will be b-pillar back. I've been playing around with the box design and it will be right around 30 cu ft. with around 420 sq in. of port. This is my first multi-woofer build and I really need help with bracing. What would be the best type of bracing I can use? And how do I calculate port bracing into the sq in. and tuning of the port? Thanks for the help! Also, can I get by with doing single layered sidewalls or should i do 1.5" thick all the way around? Quote Audio Build Ride: 2002 Chevy Blazer 4 door Head Unit: Pioneer deh-80prs Subs: 4 DC Level 3 15's in a 4th order wall designed by Trent Choate and Jeff Smith Subs Amp: AQ 3500.1 at wired at .5 (soon to be 2) Mids/Highs Amp: Skar 85.4 Mids/Highs: Skar components Electrical: Mechman 270 amp alt, 2 runs of Knu 0 gauge, XS Power d3400, 2 Deka Group 9a31 Build log : http://www.stevemeadedesigns.com/board/topic/167658-indianabasshead-blazer-dc-audio-4th-order-wall-build/ Perfomance Build 2003 Nissan 350z Greddy Twin Turbo, 3" Test pipes with Borla high-flow cats, Crawford Performance Plenum, Greddy E-manage Ultimate ECU Exedy Racing Clutch, Built Motor by Racing Innovations Greddy Over-fender aero kit (1 of 20 ever made), 19" Racing Hart r5 pro wheels 466rwhp Bike 2008 Midnight Blue Kawasaki ZX-14 Stretched 8" and lowered, Brocks Sidewinder exhaust, Power Commander 5 Link to comment Share on other sites More sharing options...
Scynte Posted August 10, 2012 Report Share Posted August 10, 2012 Out of curiousity how much power are you planning on using for them... ? Quote Link to comment Share on other sites More sharing options...
IndianaBassHead Posted August 10, 2012 Author Report Share Posted August 10, 2012 They're running of a crescendo BC3500d at .66 ohms. So right at 4k watts for now. Hopefully upgrading to a bc5500 eventually. Quote Audio Build Ride: 2002 Chevy Blazer 4 door Head Unit: Pioneer deh-80prs Subs: 4 DC Level 3 15's in a 4th order wall designed by Trent Choate and Jeff Smith Subs Amp: AQ 3500.1 at wired at .5 (soon to be 2) Mids/Highs Amp: Skar 85.4 Mids/Highs: Skar components Electrical: Mechman 270 amp alt, 2 runs of Knu 0 gauge, XS Power d3400, 2 Deka Group 9a31 Build log : http://www.stevemeadedesigns.com/board/topic/167658-indianabasshead-blazer-dc-audio-4th-order-wall-build/ Perfomance Build 2003 Nissan 350z Greddy Twin Turbo, 3" Test pipes with Borla high-flow cats, Crawford Performance Plenum, Greddy E-manage Ultimate ECU Exedy Racing Clutch, Built Motor by Racing Innovations Greddy Over-fender aero kit (1 of 20 ever made), 19" Racing Hart r5 pro wheels 466rwhp Bike 2008 Midnight Blue Kawasaki ZX-14 Stretched 8" and lowered, Brocks Sidewinder exhaust, Power Commander 5 Link to comment Share on other sites More sharing options...
baaudio Posted August 10, 2012 Report Share Posted August 10, 2012 i would double all around. i did a single on my box and it flexes like a mofo. then you could use 2x4s for bracing or, if you can weld, make some braces out of steel and paint them. Quote Team NWSPL baaudio Build Log 2001 GMC Sierra walkthrough 4 Mechman Elite 370s, 10 AGM batteries, 3 Crossfire XS v2 18s, Crossfire 8k Link to comment Share on other sites More sharing options...
HunterJohnson Posted August 10, 2012 Report Share Posted August 10, 2012 I'd use 1inch thick mdf. found at local lumber yard. Brace with threaded rods or 2x4's plus fiberglass and resin the insides and double baffle the top. Quote Scion tC SQ BuildiPad mini, lots of fabrication, daily drivenFord Explorer C Pillar Wall Build Just a cheap car to destroy with bass Link to comment Share on other sites More sharing options...
IndianaBassHead Posted August 10, 2012 Author Report Share Posted August 10, 2012 i would double all around. i did a single on my box and it flexes like a mofo. then you could use 2x4s for bracing or, if you can weld, make some braces out of steel and paint them. I don't trust myself welding. lol. But would you do angled 2x4's from side to top, or 2x4's straight up and down from top to bottom? Quote Audio Build Ride: 2002 Chevy Blazer 4 door Head Unit: Pioneer deh-80prs Subs: 4 DC Level 3 15's in a 4th order wall designed by Trent Choate and Jeff Smith Subs Amp: AQ 3500.1 at wired at .5 (soon to be 2) Mids/Highs Amp: Skar 85.4 Mids/Highs: Skar components Electrical: Mechman 270 amp alt, 2 runs of Knu 0 gauge, XS Power d3400, 2 Deka Group 9a31 Build log : http://www.stevemeadedesigns.com/board/topic/167658-indianabasshead-blazer-dc-audio-4th-order-wall-build/ Perfomance Build 2003 Nissan 350z Greddy Twin Turbo, 3" Test pipes with Borla high-flow cats, Crawford Performance Plenum, Greddy E-manage Ultimate ECU Exedy Racing Clutch, Built Motor by Racing Innovations Greddy Over-fender aero kit (1 of 20 ever made), 19" Racing Hart r5 pro wheels 466rwhp Bike 2008 Midnight Blue Kawasaki ZX-14 Stretched 8" and lowered, Brocks Sidewinder exhaust, Power Commander 5 Link to comment Share on other sites More sharing options...
IndianaBassHead Posted August 10, 2012 Author Report Share Posted August 10, 2012 I'd use 1inch thick mdf. found at local lumber yard. Brace with threaded rods or 2x4's plus fiberglass and resin the insides and double baffle the top. will try that, thanks. Never new lumber yards had 1" thick. but will 2x4's do as well as threaded rods? because 2x4's would be a lot easier. Quote Audio Build Ride: 2002 Chevy Blazer 4 door Head Unit: Pioneer deh-80prs Subs: 4 DC Level 3 15's in a 4th order wall designed by Trent Choate and Jeff Smith Subs Amp: AQ 3500.1 at wired at .5 (soon to be 2) Mids/Highs Amp: Skar 85.4 Mids/Highs: Skar components Electrical: Mechman 270 amp alt, 2 runs of Knu 0 gauge, XS Power d3400, 2 Deka Group 9a31 Build log : http://www.stevemeadedesigns.com/board/topic/167658-indianabasshead-blazer-dc-audio-4th-order-wall-build/ Perfomance Build 2003 Nissan 350z Greddy Twin Turbo, 3" Test pipes with Borla high-flow cats, Crawford Performance Plenum, Greddy E-manage Ultimate ECU Exedy Racing Clutch, Built Motor by Racing Innovations Greddy Over-fender aero kit (1 of 20 ever made), 19" Racing Hart r5 pro wheels 466rwhp Bike 2008 Midnight Blue Kawasaki ZX-14 Stretched 8" and lowered, Brocks Sidewinder exhaust, Power Commander 5 Link to comment Share on other sites More sharing options...
pa-pa-platypus Posted August 10, 2012 Report Share Posted August 10, 2012 threaded rod> 2x4's all day everyday.. all thread isnt all that hard to put on just takes a little time Quote This isn't teeball. YOU DO NOT GET A TROPHY JUST BECAUSE YOU SHOW UP. Put the work in and then maybe get the respect when it has been earned 151.6 with single 12 at 41 hz 153.2 with 2 12's at 43 hz power: dd m4 Link to comment Share on other sites More sharing options...
pa-pa-platypus Posted August 10, 2012 Report Share Posted August 10, 2012 if you wanna make it so the bottoms sits flush without have the nuts sticking through use 2 piece of half inch glued together and cut out a whole in the second layer for the nuts to sit..kinda like flush mounting a sub basically Quote This isn't teeball. YOU DO NOT GET A TROPHY JUST BECAUSE YOU SHOW UP. Put the work in and then maybe get the respect when it has been earned 151.6 with single 12 at 41 hz 153.2 with 2 12's at 43 hz power: dd m4 Link to comment Share on other sites More sharing options...
Scynte Posted August 10, 2012 Report Share Posted August 10, 2012 Could also use threaded rods as well to brace it and I agree with baaudio, atleast double all around Quote Link to comment Share on other sites More sharing options...
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