USAFMileHigh Posted August 12, 2012 Report Share Posted August 12, 2012 Planning has to be done today and building tomorrow as I go off to College in like 2 days... I'm building a new box, and picking up another SA-12 (already have 1 at the moment) running off a BRZ1700.1D. Sundown recommends 1.75cuft per subwoofer, I assume this is after displacements? The box size I am looking to build right now is 32W/14.5H/23D with a 4" slot port, which is a gross volume of 4.922 before port/subwoofer/45 displacements. I will be sealing off the trunk of my Cobalt SS sedan in the nearish future, therefore the port will be on the front (same face as the subs). Will it matter if the port is in between the subs or if the port shares a wall with the box? As far as port length goes, I used a mixture of the12volt.com and RE Audio box calculator to calculate tuning, and I'd like some input. I want it tuned between 32hz and 34hz (doesn't really matter too much to me, it's a daily driver). Right now, in the RE Audio calculator I have that box with a 4" slot port, 30" long. After port displacement my it says my volume is 4.021, each subwoofer is .14 displacement if I remember correctly, so -.28 = ~3.741cuft before I add in 45's? Therefore if I use small 45's in all the corners, ~3.5cuft and the 30" of port length should be perfect for a ~33hz output correct? Did I do any of my math wrong? Will 45's and a double baffle be enough bracing? Thanks Quote Link to comment Share on other sites More sharing options...
n8ball2013 Posted August 12, 2012 Report Share Posted August 12, 2012 Re box calc sucks your tuning will be off Quote THERE IS NO BUILD LOG! 1998 Chevy Silverado ext cab Alpine CDA-9887 4 Team Fi 15s 2 Ampere Audio TFE 8.0 2 Ampere Audio 150.4 3 Digital Designs CS6.5 component sets Dual Mechman 370XP Elite alternators inbound! 8 XS Power d3400 6 XS power d680 Second Skin Stinger Tsunami Wiring Sky High A Real Voltmeter not a piece of shit stinger. Link to comment Share on other sites More sharing options...
Socky Posted August 12, 2012 Report Share Posted August 12, 2012 45s have shown to hurt people in scores. It will save wood if the port shares a wall. Have you look into trying torres box calculator in the enclosure section? Quote Jeep Cherokee 4dr -4.75 in front, new rusty's 4.5 in rear leafs -micky thompson 35x14.50x15 -locker rear -Rusty's offroad Engine/transmission/transfer case/crossmember/gas tank skid plates -Warn front bumper with 8000lb winch -Custom rear bumper -Warrior product tube doors (summertime) -Optima redtop (starter) -26XK miles and still runs like a bat out of hell Kenwood H/U 1/0 wire, 136 amp alt 200 ah batteries 12.7 daily 2 Apsm 1500 @ 2 ohm strapped on zv3 d1 with ns softparts Mb quart 125.4 wired to 4 aura 6's 3.6 cube box tuned to 36 plays down to 23hz Link to comment Share on other sites More sharing options...
USAFMileHigh Posted August 12, 2012 Author Report Share Posted August 12, 2012 Re box calc sucks your tuning will be off Well yes, if you actually read the post you would realize I used the12volt.com, accounting for displacements. Re Audio tells me the tuning will be at 31hz which I know is off. Quote Link to comment Share on other sites More sharing options...
USAFMileHigh Posted August 12, 2012 Author Report Share Posted August 12, 2012 45s have shown to hurt people in scores. It will save wood if the port shares a wall. Have you look into trying torres box calculator in the enclosure section? Saving wood isn't an issue. I've never heard of 45's hurting people's scores? And I don't know how to use torres box calculator which is why I was hoping someone would double check and help me out Quote Link to comment Share on other sites More sharing options...
n8ball2013 Posted August 12, 2012 Report Share Posted August 12, 2012 In did read the post that's why I said it have fun figuring it our on your own Quote THERE IS NO BUILD LOG! 1998 Chevy Silverado ext cab Alpine CDA-9887 4 Team Fi 15s 2 Ampere Audio TFE 8.0 2 Ampere Audio 150.4 3 Digital Designs CS6.5 component sets Dual Mechman 370XP Elite alternators inbound! 8 XS Power d3400 6 XS power d680 Second Skin Stinger Tsunami Wiring Sky High A Real Voltmeter not a piece of shit stinger. Link to comment Share on other sites More sharing options...
USAFMileHigh Posted August 12, 2012 Author Report Share Posted August 12, 2012 In did read the post that's why I said it have fun figuring it our on your own XD II'm pretty sure I figured it out on my own, just trying to get a second opinion. Didn't mean for my first response to come off so smart-assish haha my bad Quote Link to comment Share on other sites More sharing options...
jlh2003 Posted August 12, 2012 Report Share Posted August 12, 2012 (edited) torres box builder is idiot proof all you do is plug in measurements and it does all the calculations. i did it for u 14.5H X 38W X 23D port 4W X 13H X 30L .28 for sub displacement .08 for bracing .17 xtra baffle displacement after displacement comes to 3.20 @33.97hz that gives you 1.6 per sub, which is within the 1.5-2.0 cu ft recommended, that should be fine Edited August 12, 2012 by jlh2003 Quote http://www.termpro.com/asp/competitorstats.asp?Competitor_ID=88276 AlphaDamp CLD Tiles - Get more sound deadening using less sound deadener http://www.secondskinaudio.com/products/AlphaDamp.php Link to comment Share on other sites More sharing options...
USAFMileHigh Posted August 12, 2012 Author Report Share Posted August 12, 2012 torres box builder is idiot proof all you do is plug in measurements and it does all the calculations. i did it for u 14.5H X 38W X 23D port 4W X 13H X 30L .28 for sub displacement .08 for bracing .17 xtra baffle displacement after displacement comes to 3.20 @33.97hz that gives you 1.6 per sub, which is within the 1.5-2.0 cu ft recommended, that should be fine Thanks I was planning on mounting the extra baffle outside the box, but I guess I can extend the box .75" in Depth and throw that in there so I don't have that extra .17 displacement. Quote Link to comment Share on other sites More sharing options...
jlh2003 Posted August 12, 2012 Report Share Posted August 12, 2012 (edited) either way you should be fine, 3.2 or 3.37 should be fine regardless Edited August 12, 2012 by jlh2003 Quote http://www.termpro.com/asp/competitorstats.asp?Competitor_ID=88276 AlphaDamp CLD Tiles - Get more sound deadening using less sound deadener http://www.secondskinaudio.com/products/AlphaDamp.php Link to comment Share on other sites More sharing options...
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