bdog Posted October 26, 2011 Report Share Posted October 26, 2011 this calculator will help you build it just double check it with torries http://reaudio.com/box.php Quote REP Link to comment Share on other sites More sharing options...
darkraid Posted October 26, 2011 Author Report Share Posted October 26, 2011 I'm using Torres Box Calculator off this forum. I was going to try for 2.5cu.ft @ ~30hz. But the port length is just huge. I seem to have got a combination on Torres Box calculator that gives me 2.49cu.ft @ 30.72hz (34.80sq" port area x 35" port length). Is 35" a long port? Quote Link to comment Share on other sites More sharing options...
CleanSierra Posted October 26, 2011 Report Share Posted October 26, 2011 No, that isn't a terribly long port because the port bends. So it goes so many inches INTO the box, makes a 90 degree turn and goes the rest of the way to fulfill your 35 inches. 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...
CleanSierra Posted October 26, 2011 Report Share Posted October 26, 2011 Also, if you want to get fancy and have a potentially flat response curve, try fooling around with a 4th order design. 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...
darkraid Posted October 26, 2011 Author Report Share Posted October 26, 2011 Yeah of course the port bends but I just thought that 35" was fairly long. Hmmm 4th order, What program can I use to see the frequency response and that? I know theres WinISD but that's not made for car situations. I've got Bass Box Pro but no idea how to use it. Quote Link to comment Share on other sites More sharing options...
CleanSierra Posted October 26, 2011 Report Share Posted October 26, 2011 The standard(usually good to go by) formula is running the sub in its recommended sized vented requirements and half that as the sealed area of the 4th order. Typically it's a 2:1 ratio guys use. And they tune higher, like 45 hz'ish. 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...
darkraid Posted October 26, 2011 Author Report Share Posted October 26, 2011 The standard(usually good to go by) formula is running the sub in its recommended sized vented requirements and half that as the sealed area of the 4th order. Typically it's a 2:1 ratio guys use. And they tune higher, like 45 hz'ish. Just did that in WinISD and this is what it looked like. Blue is the 4th order, green is the ported I mentioned above. Quote Link to comment Share on other sites More sharing options...
darkraid Posted October 26, 2011 Author Report Share Posted October 26, 2011 Really confused ay. Torres vs RE box calc vs my own calculations all give me different figures for the box volume and tuning with a lock port area, length and box size (length,width,height). Don't know what to believe! Quote Link to comment Share on other sites More sharing options...
412 CVX Posted October 26, 2011 Report Share Posted October 26, 2011 i'd believe torres if i were you. Quote Just say no to Ground Pounder Customs. My temp system build log More box buildssome cars do over 170db with one sub, so clearly my two 12"s can do that in my car, with my knowledge too! look out bitches! I'm with captain stupid. Link to comment Share on other sites More sharing options...
darkraid Posted October 27, 2011 Author Report Share Posted October 27, 2011 i'd believe torres if i were you. Yeah I think I will. I have a box sorted now. 2.56cu.ft NET 34 sqin port area x 35". Tuning frequency of 30.14hz. 0.75" MDF with a double stack front baffle. Gross Volume is 4.07cu.ft. Port volume is 1.23cu.ft. According to Torres. I'll throw it up on Google Sketchup now and draw my cutting plan up too. Quote Link to comment Share on other sites More sharing options...
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