Posted March 8, 200421 yr Gnome seeing ur a box builder maybe u can verify my dimensions,I made a box thats 36 x 13.5 x 15(external).The port is 3 w x 12h x 38L(tuning around 30-32hz?) ,how's this sound to u?...Is the box too big?....I can cut it down from one side but thats it,thanx in advance for ur input!
March 10, 200421 yr The outer diminsions of the box work out to 3.234The port displaces 0.792The wood that creates the port displaces 0.194The sub itself displaces .2The total internal volume after all displacement is 2.148, which is right on the money (nick recommends 2.0 @ 29hz).Good job....but next time I'm not gonna do your math for you
March 11, 200421 yr Author The outer diminsions of the box work out to 3.234The port displaces 0.792The wood that creates the port displaces 0.194The sub itself displaces .2The total internal volume after all displacement is 2.148, which is right on the money (nick recommends 2.0 @ 29hz).Good job....but next time I'm not gonna do your math for you I appreciate it Gnome,the #'s u got are very close to what I got. I think I got this box building thing figured out ,some what.Gonna order the carpet tomorrow ,I'll post pix as soon as I'm done ....thanx a mil,G!
March 25, 200421 yr how do you calculate internal volume from the external dimensions? and what about displacement? and tuning? I decided to try my hand at my first box today and used the dimensions Gnome posted for a 15XXX, the only thing is I made a first timers screw up and now the dimensions are off a little bit, not much though. so now I just want to find a formula to use to try and figure out what I have here.
March 25, 200421 yr Well----it is easier to just find out for yourself----http://www.the12volt.com/caraudio/boxcalcs.aspthere ya go--- Dave
March 25, 200421 yr how do you calculate internal volume from the external dimensions? and what about displacement? and tuning? I decided to try my hand at my first box today and used the dimensions Gnome posted for a 15XXX, the only thing is I made a first timers screw up and now the dimensions are off a little bit, not much though. so now I just want to find a formula to use to try and figure out what I have here. let's assume your width is 36". If the wood is .75" thick, the inner width would be 34.5 (36-1.5) because the sides of the box would each subtract .75".If the height is 16 for example, you'd again subtract 1.5 for the top and bottom baffles, and get 14.5. Lets also assume the depth is 12" which would yeild 10.5" of inner depth. Now we multiply these numbers (34.5*14.5*10.5=5252) then divide by 1728 (the number of cubic inches in a cubic foot) to yeild 3.04 cubic feet.....but if you don't like math, you can always use the calculator dave suggested
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