3 15 l7s box build please help

[j.castro]

wats up every one,im new to the site and im going to start my tahoes first audio build thatl be made up of 3 15 l7s and 3 Hifonics BRZ 1700.1D inoe its not he best but it will due i just have no idea on how to build a tuned ported box? can anyone help ino i want it to be tuned at 30hz if i remeber corectly this tune will make them hit the lows really well? any help is appreciated thanks

will be running
all 0 guage power and grounds
kinetik battery hc 600 out back
optima yellow top up front
big three upgrade all 0guage
and a db electrical 250 amp alt

 

[TnTahoe]

first off decide how much airspace you want the subs to have, and then come up with 2 fixed dimensions of the box and the 3rd dimension can vary

 

[GeneralNoobzor]

Last time I remember squares were built for SPL, not lows. :3 If I were you, put them at 32-34htz. Are you planning on having an interesting box or just a just rectangle with 3 chambers?

 

[j.castro]

Ok im planning on just building a rectangle three chamber box I want the box the fit perfect with wise in the back I measured 48.5 inches and I want it to be about flush with the top of the second row 23.5 inches im guessing thoes would be my two fixed dimensions and i
dnt no much about how much air space to give the subs..

 

[2000Yukon]

http://www.the12volt.com/caraudio/boxcalcs.asp

This website will help you with every thing you need to know about getting your box tuned to where you want it, port sizes, and volume.

 

[j.castro]

Thank you ..now to learn how to use the site hahaha.how much air space would u guys give the subs I want to build the box right the first time..wud u Recomend bracing?

---------- Post added at 05:06 PM ---------- Previous post was at 04:09 PM ----------

im doing some research on how much air space these subs need some say 3.5cubic feet per sub while others say 6? what do u guys recomend

 

[NoPh33rRaCiNg]

Last time I remember squares were built for SPL, not lows. :3 If I were you, put them at 32-34htz. Are you planning on having an interesting box or just a just rectangle with 3 chambers?

Square vs circle has nothing to do with the tuning or anything like that.

Thank you ..now to learn how to use the site hahaha.how much air space would u guys give the subs I want to build the box right the first time..wud u Recomend bracing?

---------- Post added at 05:06 PM ---------- Previous post was at 04:09 PM ----------

im doing some research on how much air space these subs need some say 3.5cubic feet per sub while others say 6? what do u guys recomend

I looked online it says minimum ported you want 3 cubes each, max is 6 cubes. Your going to need a pretty big box for 3 of those. Do like 14-15 cubic feet tuned to whatever you want. the12volt.com is a great site there are calculators on there where you enter your cubic feet, then it asks the width and height of your port and you enter what tuning and itll tell you how deep the port goes in the box. General rule of thumb for each cubic foot of airspace in your box you want 12-16 inches of port.

Example my box is 16 cubic feet for my 4 15's, i chose to go with a pretty big port i did 16sq inches of port per cube so 16 cubes x 16 inches of port = 256sq inches of port that i have.

 

[j.castro]

Square vs circle has nothing to do with the tuning or anything like that.



I looked online it says minimum ported you want 3 cubes each, max is 6 cubes. Your going to need a pretty big box for 3 of those. Do like 14-15 cubic feet tuned to whatever you want. the12volt.com is a great site there are calculators on there where you enter your cubic feet, then it asks the width and height of your port and you enter what tuning and itll tell you how deep the port goes in the box. General rule of thumb for each cubic foot of airspace in your box you want 12-16 inches of port.

Example my box is 16 cubic feet for my 4 15's, i chose to go with a pretty big port i did 16sq inches of port per cube so 16 cubes x 16 inches of port = 256sq inches of port that i have.

thanks man ok so i put these deminsions into the program height 25" depth 25" width 48.5" these gave me 14.23524 cubic feet of interior volume does this all sound about right?

 

[abladeafficionado]

Those dimensions though don't take the port volume into account, or the displacement of the subs. Being as large as that box is, you'd want internal bracing. Don't forget to subtract the bracing from the internal volume also.

PWK charges about $60 to design a box, fill out the request sheet and give your dimensions available, goals, vehicle, and sub's specs (Qts, Fs, Vas, etc...), and he will generate you a design optimized for your application. He designed the box for Scott Buwalda's IASCA winning SQ car, so his track record is pretty solid.

 

[j.castro]

back to the drawing board -____- ..so now i have to find out the sub displacement and subtract it from the total?