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<blockquote data-quote="OLD_SCHOOL" data-source="post: 520192" data-attributes="member: 556272">how much power and what kind of subs ? what you can do is put the box volume in winisd and the amount of power your using with the tpye of sub you are using and it can tell you how much port area you will need to keep from getting port noise which i have been told is 17.2 m/s.like i said to before&nbsp; you can start with 12-14 in^2/ cube of box&nbsp; and see what it does.&nbsp; it may be way to much,&nbsp; it may be way to little,&nbsp; it might be just right. but i bet you will find that alot of the time for general car apps thats gonna be pretty close to what you can useyou need to use the net volume in the tuning&nbsp; before sub displacement than figure in sub displacement and port displacement (so if your subs call for 4 cubes per sub use that not 4 cubes + sub displacement if your using this equationLv = Av*1.84*10^8/[Vb*1728*(Fb/0.159)^2] - 0.823*sqrt(Av)this how i understand how to do iti am no expert and am learning this as well but i think&nbsp; that will work for youalso i don&#039;t know if long short wide thin makes any differance but i have heard several times that port area = port area whether its in a tube a slot or 30 ich pipe sticking out of the box</blockquote>

[QUOTE="OLD_SCHOOL, post: 520192, member: 556272"] how much power and what kind of subs ? what you can do is put the box volume in winisd and the amount of power your using with the tpye of sub you are using and it can tell you how much port area you will need to keep from getting port noise which i have been told is 17.2 m/s. like i said to before you can start with 12-14 in^2/ cube of box and see what it does. it may be way to much, it may be way to little, it might be just right. but i bet you will find that alot of the time for general car apps thats gonna be pretty close to what you can use you need to use the net volume in the tuning before sub displacement than figure in sub displacement and port displacement (so if your subs call for 4 cubes per sub use that not 4 cubes + sub displacement if your using this equation Lv = Av*1.84*10^8/[Vb*1728*(Fb/0.159)^2] - 0.823*sqrt(Av) this how i understand how to do it i am no expert and am learning this as well but i think that will work for you also i don't know if long short wide thin makes any differance but i have heard several times that port area = port area whether its in a tube a slot or 30 ich pipe sticking out of the box [/QUOTE]

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