Piggi3 Posted February 7, 2013 Report Share Posted February 7, 2013 Hey guys just doing the draw up for my 4th order. I no Cj helped me out in my last post on sealed specs so here is why I'm Thinking going on his recommendation. If you don't know I'm planning on running 4 dc audio lvl 5 15s m2 with ab 1100.1 1.75cubes sealed so sealed portion is going to be 7cubes. Sub mounted outside (so I can smell the coil ) then 18.5 ported without sub displacement so 17.5 with. With 400square inches of port. No I'm trying to figure out what to tune to. The box is about 26.72 cubes internally all together and I did 16" per cube is this correct. Hope I did this right. I have a pic of a drawing but not sure how to post it. Thanks for he help in advance Quote Link to comment Share on other sites More sharing options...
Piggi3 Posted February 7, 2013 Author Report Share Posted February 7, 2013 Quote Link to comment Share on other sites More sharing options...
CortezDTV Posted February 7, 2013 Report Share Posted February 7, 2013 Need more port imo Closer to 18 or 20 inches of port per cube Quote SCSB Santa Cruz Speaker Box Build logs: Daily Driver Lemon Marquis 2 american bass 750.1s 350.4 on 14 focal 6.5s sq 945 on 4 hertz tweeters Mystery subs http://www.stevemead...__fromsearch__1 The Mustang 'dubbed' Shirley the project from bullet holes to badass http://www.stevemead...cond-skin-time/ Link to comment Share on other sites More sharing options...
Piggi3 Posted February 7, 2013 Author Report Share Posted February 7, 2013 Really 20". Ok Just wanna see what Cj thinks since he ha this setup as well Quote Link to comment Share on other sites More sharing options...
Nikitaaa Posted February 7, 2013 Report Share Posted February 7, 2013 Start with 18" per and work your way down. Quote 2007 M/T Honda Civic Coupe EX (4) Sundown Audio X-8's (2) Ampere Audio 3800.1's (3) Stinger SPV-44 Batteries (1) Mechman 240 3:1 Ratio 4th order sealed from the trunkTEAM NWSPLBest termlab scores to date in Honda trunk:151.7db legal (official) IASCA trunk 3 classBest termlab scores to date in my walled Subie:152.9db legal (unofficial) IASCA advanced 2 class155db outlaw Link to comment Share on other sites More sharing options...
CortezDTV Posted February 7, 2013 Report Share Posted February 7, 2013 I'm at 28 inches of port per cube with my 4th My buddy bill is right around 20 with a similar box to urs I would at least do 20 but that's just me 18 would work Quote SCSB Santa Cruz Speaker Box Build logs: Daily Driver Lemon Marquis 2 american bass 750.1s 350.4 on 14 focal 6.5s sq 945 on 4 hertz tweeters Mystery subs http://www.stevemead...__fromsearch__1 The Mustang 'dubbed' Shirley the project from bullet holes to badass http://www.stevemead...cond-skin-time/ Link to comment Share on other sites More sharing options...
Nikitaaa Posted February 7, 2013 Report Share Posted February 7, 2013 I agree. I started with 18 here and that's what my box seemed to like. I've also heard that half of the cone area of your subs is a place to start. But take that with a grain of salt. Quote 2007 M/T Honda Civic Coupe EX (4) Sundown Audio X-8's (2) Ampere Audio 3800.1's (3) Stinger SPV-44 Batteries (1) Mechman 240 3:1 Ratio 4th order sealed from the trunkTEAM NWSPLBest termlab scores to date in Honda trunk:151.7db legal (official) IASCA trunk 3 classBest termlab scores to date in my walled Subie:152.9db legal (unofficial) IASCA advanced 2 class155db outlaw Link to comment Share on other sites More sharing options...
CortezDTV Posted February 7, 2013 Report Share Posted February 7, 2013 It all comes down to port velocity..... Which is determined by port area and tuning frequency You need a specific number.... Also very important and a good quote from Hackmunch "Port flares Well enginering studies show that a 20% radius is optimal for spl and cutiing down turbulance to an absolute minimium. So a proper 8" flare should have a minimium of 1.6" radius . 8" + 3.2" =11.2 plus flat for mounting. Anyone making pvc flares (won't mention any names)with less than 20% radius is really wasting peoples time and money. Don't get me wrong a little flare is better than nothing but a proper flare is wayyy better than a little one." Quote SCSB Santa Cruz Speaker Box Build logs: Daily Driver Lemon Marquis 2 american bass 750.1s 350.4 on 14 focal 6.5s sq 945 on 4 hertz tweeters Mystery subs http://www.stevemead...__fromsearch__1 The Mustang 'dubbed' Shirley the project from bullet holes to badass http://www.stevemead...cond-skin-time/ Link to comment Share on other sites More sharing options...
Piggi3 Posted February 7, 2013 Author Report Share Posted February 7, 2013 Ok thanks guys. I guess all start at 18 and go from thier Quote Link to comment Share on other sites More sharing options...
CJ18 Posted February 7, 2013 Report Share Posted February 7, 2013 I am using 15in2 per cube for the port and love it. Quote Link to comment Share on other sites More sharing options...
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