SenorPeligro Posted June 1, 2011 Report Share Posted June 1, 2011 Just started getting into the car audio thing. Trying to learn as much as possible on the internet, but it's a whole lotta math/formulas (not my best subject). I think I've got it down. Below is a link to a pic of a box I designed in Sketchup. I think it'll work for a 15" Fi BL, but like I said I'm new to this. http://tinypic.com/r/19tfn6/7 Also, when they refer to port LENGTH, what exactly does that mean? Thanks in advance. Quote Link to comment Share on other sites More sharing options...
nCOMP1337 Posted June 1, 2011 Report Share Posted June 1, 2011 it will be helpful if you can post the height, width and depth of that box and what thickness of wood you plan to use also you see in that design where the L port is made (you have 2 pieces of wood parallel to the back and the side of the box, well the port length i believe goes form the beginning of the port, left edge of the wood parallel to back wall, and then to the end of the port, which should be the edge of box, where the air would exit the enclosure now i am a super noob, however, regardless of it im right, it is still helpful to post dimensions of your box, as well as what tuning you are hoping to achieve ive only designed 1 box thats actually been built and although it seems he was happy, i dont have enough experience too give too much advice hence the disclaimer in my sig, lol Quote Link to comment Share on other sites More sharing options...
SenorPeligro Posted June 1, 2011 Author Report Share Posted June 1, 2011 Sorry, H18 x D18 x L24. Want to tune to 29 to 30 hz. Quote Link to comment Share on other sites More sharing options...
SenorPeligro Posted June 1, 2011 Author Report Share Posted June 1, 2011 3/4 MDF also. Quote Link to comment Share on other sites More sharing options...
nCOMP1337 Posted June 1, 2011 Report Share Posted June 1, 2011 (edited) what is the length of the two port walls? also what is the width of the port, looks to be 2-3 inches? and i believe you measure down the center for accurate port length when it bends Edited June 1, 2011 by kynto Quote Link to comment Share on other sites More sharing options...
Alex K Posted June 1, 2011 Report Share Posted June 1, 2011 youre starting with 3.5 cubes. You need to end with 3.5 cubes after port, bracing, sub displacement etc. Start out with ag gross voulme of maybe 5-6 cubes and aim for a net volume of 3.5-4. Quote 2006 Nissan Z Track. My Feedback Thread i used to think a band pass was something you were around your neck or something. Link to comment Share on other sites More sharing options...
nCOMP1337 Posted June 1, 2011 Report Share Posted June 1, 2011 yea, by guesstimating the port dimensions, i got a tuning of 31 but net volume of 2.36, waiting for his reply to see actual port dimensions though, but it doesnt seem large enough after displacement of everything either needs to be wider or deeper or bit of both i think could be wrong though, lol Quote Link to comment Share on other sites More sharing options...
SenorPeligro Posted June 1, 2011 Author Report Share Posted June 1, 2011 youre starting with 3.5 cubes. You need to end with 3.5 cubes after port, bracing, sub displacement etc. Start out with ag gross voulme of maybe 5-6 cubes and aim for a net volume of 3.5-4. Aha, that's what I was hung up on. Kynto, the port is 3" x 15" deep and 7 across the back. Quote Link to comment Share on other sites More sharing options...
nCOMP1337 Posted June 1, 2011 Report Share Posted June 1, 2011 (edited) im assuming 16.5 tall for the port since its 18 tall with .75 mdf if the port is 22 inch long or even close to that and 3 inch wide that gives a tuning of 43.45 and a net volume of 2.54 if you were restricted on spaced and had to have the box like that, you would have to cut the port width in half to 1.5 to get a tuning of ~30Hz and net volume of 2.88 i suggest trying to get the proper volume for the sub over tuning, because the sub will have a range it can play, though its restricted based on type of box it be best if you could add either some width, depth, or both is there room for a larger box? just a thought: someone would have to chime in that knows more, but should the port opening (where the air first enters port) be a specific distance from the wall based on the width of the port, or does that matter? Edited June 1, 2011 by kynto Quote Link to comment Share on other sites More sharing options...
SenorPeligro Posted June 1, 2011 Author Report Share Posted June 1, 2011 It's going in the back of an Xterra, so I've got more room. I was confused if the recommended volume was net or gross. Quote Link to comment Share on other sites More sharing options...
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