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<blockquote data-quote="Omarvelous" data-source="post: 2797022" data-attributes="member: 551770">Take 1.5 cuft, multiply it by 1728 = 2592 cu in. (x3 to get for 1.5*3)Lets say you have a DEF height.... 15&quot;, and a DEF width of 30&quot;.... (Internal #s.....keep that in mind!)So you experiment with numbers...&quot;I&#039;ll try the max first&quot; Divide 2592 by 15 and then 30, that would give you the depth you need.2592/15 = 172.8 then /30 = 5.75. So IF your box was 15&quot; tall, and 30&quot; wide, u&quot;d need a depth of 5.75....to get 1.5cuftHope that helps somewhat.Another tip, figure out how much 1&quot; depth for the width/height u wanna use... (or 1&quot; width for height/depth, 1&quot; height for width/depth, vice versa.)15&quot;x30&quot;x1&quot; = 450/1728 = approx .26 cuin. Sooo....15x30x10 = .26 * 10 = 2.615x30x15 = 2.6 + 1.3 = 3.9.... See where i&#039;m going here? Simple algebra15x30x16 = 3.9 + .26 = 4.16.cuftORRR just go to RockfordFosgate.com , they have a new box building feature. Haven&#039;t used it, don&#039;t need to but might help 4 u.</blockquote>

[QUOTE="Omarvelous, post: 2797022, member: 551770"] Take 1.5 cuft, multiply it by 1728 = 2592 cu in. (x3 to get for 1.5*3) Lets say you have a DEF height.... 15", and a DEF width of 30".... (Internal #s.....keep that in mind!) So you experiment with numbers... "I'll try the max first" Divide 2592 by 15 and then 30, that would give you the depth you need. 2592/15 = 172.8 then /30 = 5.75. So IF your box was 15" tall, and 30" wide, u"d need a depth of 5.75....to get 1.5cuft Hope that helps somewhat. Another tip, figure out how much 1" depth for the width/height u wanna use... (or 1" width for height/depth, 1" height for width/depth, vice versa.) 15"x30"x1" = 450/1728 = approx .26 cuin. Sooo.... 15x30x10 = .26 * 10 = 2.6 15x30x15 = 2.6 + 1.3 = 3.9.... See where i'm going here? Simple algebra 15x30x16 = 3.9 + .26 = 4.16.cuft ORRR just go to RockfordFosgate.com , they have a new box building feature. Haven't used it, don't need to but might help 4 u. [/QUOTE]

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