roycealbert1 Posted February 6, 2014 Report Share Posted February 6, 2014 im going to do a blow through on my truck eventually. i made up this box on sketchup just wondering if this box would work for music im not really concerned about spl since it will already be loud enough with 2 15s for me. the subs im going to use are 2 sundown x 15s and i have a saz 2500 right now. http://s1372.photobucket.com/user/roycealbert123/media/bandpassbox12_zpsc2c9e850.jpg.html?sort=3&o=0 the ported side is 8.5 ft cubed. with 3 9.5"x6" flared ports. tuned to 45hz.. the sealed side is 5.4 ft cubed. and i have not decided if im going to have the subs inverted or not. if anyone has any tips or comments about my box well i need to know if it might work! Link to comment Share on other sites More sharing options...
HowLowCanYouGo Posted February 6, 2014 Report Share Posted February 6, 2014 Fixed for ya Nothing for now... Did you get that scar tissue when you got your vagina installed? I'd grab Adam's ass and look him in the eyes for a demo of nates truck. Link to comment Share on other sites More sharing options...
ToNasty Posted February 6, 2014 Report Share Posted February 6, 2014 Not sure if that's enough port area for those subs ***Super Sellers List***http://www.stevemeadedesigns.com/board/topic/25829-super-sellers-buyers Link to comment Share on other sites More sharing options...
john253a Posted February 6, 2014 Report Share Posted February 6, 2014 Your a bit short on the number of ports Your going to want around 600-630sq" @45hz of port to do a blow through with 2x X15 You could do it as low as 300sq" but you may not get the desired outcome Link to comment Share on other sites More sharing options...
roycealbert1 Posted February 6, 2014 Author Report Share Posted February 6, 2014 on sundowns website for the other larger subs they recommended size for a ported box is around 3-4^3 inches. and idk if my calculations are right but with the 3 6x9.5 ports i got about 800^3 inches. and shouldnt it be even more since they will be flared? Link to comment Share on other sites More sharing options...
john253a Posted February 7, 2014 Report Share Posted February 7, 2014 3off 6" ports 9.5" long is what have drawn and written down Is that not 84sq" ? And it's not cubed its square Link to comment Share on other sites More sharing options...
roycealbert1 Posted February 8, 2014 Author Report Share Posted February 8, 2014 im sorry i guess i dont really understand what your talking about. for the surface area of the ports im getting 536sq"? so are you saying i need to add just tad bit more port area oh and also i got my port length and stuff from a 4th order port calculator website Link to comment Share on other sites More sharing options...
CleanSierra Posted February 8, 2014 Report Share Posted February 8, 2014 Your math is wrong however you're calculating port surface area. 3 6" ports(no matter how long in the world) are only 84.78" of area. Port area is a 2 dimensional measurement and works be obtained by Pi*R^2. Pi is 3.14 and your radius is 3". 3" squared is 9 and multiplied by Pi, you're at 28.26 per port. Since there are 3 ports, you multiply by 3 reaching the final number of 84.78" of port area. To address your port area question from some website you find, that's not correct, or you did something Wrong. Could you please link the website so I can check it out? When I check suggested port area for a regular ported box, I get 280" suggested and for a 4th order bandpass, I come up with 540". So when for a normal vented enclosure, you're far under what it's suggested. You also have to think of it this way: the port is your only addy of getting the sound OUT of the enclosure. Do you think you're going to get all that sound and pressure out of 3 holes that are 6" in diameter into your vehicle cabin? It's like trying to push a bowling ball through a garden hose. I can almost guarantee you would have more of an effect if a VERY leaky sealed box than a vented enclosure. So your solution will be redesign your enclosure with much more port area. A little piece of advise also, don't place a port directly in front of a subwoofer as it will likely cause unloading issues. Keep the subs from firing directly into the port opening. 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 February 8, 2014 Report Share Posted February 8, 2014 on sundowns website for the other larger subs they recommended size for a ported box is around 3-4^3 inches. and idk if my calculations are right but with the 3 6x9.5 ports i got about 800^3 inches. and shouldnt it be even more since they will be flared? You don't multiply port depth when calculating port area. Port area is a two dimensional figure. You're trying to calculate port volume. 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...
roycealbert1 Posted February 8, 2014 Author Report Share Posted February 8, 2014 ok thanks for clearing that up!! well my computer crashed yesterday and i lost all my stuff so now ive been thinking everything over and i think im going to go with 4 sa 12s now! Link to comment Share on other sites More sharing options...
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