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<blockquote data-quote="jmrunz" data-source="post: 3536023" data-attributes="member: 570120">brokeitagain.&nbsp; dont get discourraged people just tell you what they know.&nbsp; with that here is what i know.when you build a box for 2 subs shared space the volume needs to be big enough for both subs.&nbsp; say each sub requires 2 cubes then you need a 4 cub net box.&nbsp; keep in mind that that is after port and sub displacement.&nbsp;&nbsp; you can easuly end up with a 5.5 cube box to get 4 cubes net.a rull of thumb we use is 16 inches squared per cubic foot of box volume.&nbsp; when you run a divider in the center of the port dividing the chambers up the playable area comes back into each chamber a bit.port tuning is dependand on surface area and depth of port.&nbsp; the smaller the surface area the higher port noise you have.&nbsp; if you go to ddaudio.com and use their calculator it works real good but you want to figure it out yourself i have a couple of formulas and web sites you can visit to get these for yourself and i hope they help you as they have helped me a ton.here they are.<a href="http://www.realmofexcursion.com/forum/showpost.php?p=447126&amp;amp;postcount=1." target="_blank">http://www.realmofexcursion.com/forum/showpost.php?p=447126&amp;amp;postcount=1.</a><a href="http://www.caraudio911.com/tutorials/PortedBox/images/001.gif" target="_blank">http://www.caraudio911.com/tutorials/PortedBox/images/001.gif</a><a href="http://www.usenclosure.com/Enclosure%20Formula" target="_blank">http://www.usenclosure.com/Enclosure%20Formula&#039;s/enclosure_formula.htm</a>and here are some difinations of abreviations.Lv = port length (what your solving for)Av = your port area (height x width of the port face)Vb = the internal volume of your boxFb = the tuning frequency you wantagain i hope these pages and info helps you in what you want.james</blockquote>

[QUOTE="jmrunz, post: 3536023, member: 570120"] brokeitagain. dont get discourraged people just tell you what they know. with that here is what i know. when you build a box for 2 subs shared space the volume needs to be big enough for both subs. say each sub requires 2 cubes then you need a 4 cub net box. keep in mind that that is after port and sub displacement. you can easuly end up with a 5.5 cube box to get 4 cubes net. a rull of thumb we use is 16 inches squared per cubic foot of box volume. when you run a divider in the center of the port dividing the chambers up the playable area comes back into each chamber a bit. port tuning is dependand on surface area and depth of port. the smaller the surface area the higher port noise you have. if you go to ddaudio.com and use their calculator it works real good but you want to figure it out yourself i have a couple of formulas and web sites you can visit to get these for yourself and i hope they help you as they have helped me a ton. here they are. [URL="http://www.realmofexcursion.com/forum/showpost.php?p=447126&postcount=1."]http://www.realmofexcursion.com/forum/showpost.php?p=447126&postcount=1.[/URL] [URL="http://www.caraudio911.com/tutorials/PortedBox/images/001.gif"]http://www.caraudio911.com/tutorials/PortedBox/images/001.gif[/URL] [URL="http://www.usenclosure.com/Enclosure%20Formula"]http://www.usenclosure.com/Enclosure%20Formula's/enclosure_formula.htm[/URL] and here are some difinations of abreviations .Lv = port length (what your solving for) Av = your port area (height x width of the port face) Vb = the internal volume of your box Fb = the tuning frequency you want again i hope these pages and info helps you in what you want. james [/QUOTE]

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