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<blockquote data-quote="maldecido33" data-source="post: 3012202" data-attributes="member: 556412">if the manufacturer lists the internal volume, why would you try and calculate it yourself.Just do (13.0-1.5)*(13.0-1.5)*(12.5-1.5)the 1.5 you subtract is to account for the thickness of the wood (.75&quot; on either side of the enclosure; .75+.75=1.5)So,= (13.0-1.5)*(13.0-1.5)*(12.5-1.5)= (11.5)*(11.5)*(11)= 1454.75 cubic inchesTo convert to cubic feet:= 1454.75 / 1728= 0.842 cubic feetA 12&quot; Type R has a displacement volume of 0.071 cubic feet. I&#039;m assuming this box only holds one Subwoofer as the dimensions wouldn&#039;t allow for two. So, we subtract 0.071 from our gross volume of 0.842 to get our net volume.0.842 - 0.071 = 0.771 cubic feet NET VOLUMENow if you have two of these enclosures, one per sub, you would have a total of 0.771 + 0.771 which equals 1.542 cubic feet.This is the proper size for only one 12&quot; subwoofer; I&#039;d really look into a custom built ported enclosure by one of the designer&#039;s on here. Look at BJ Fisher&#039;s work; I recommend him.</blockquote>

[QUOTE="maldecido33, post: 3012202, member: 556412"] if the manufacturer lists the internal volume, why would you try and calculate it yourself. Just do (13.0-1.5)*(13.0-1.5)*(12.5-1.5) the 1.5 you subtract is to account for the thickness of the wood (.75" on either side of the enclosure; .75+.75=1.5) So, = (13.0-1.5)*(13.0-1.5)*(12.5-1.5) = (11.5)*(11.5)*(11) = 1454.75 cubic inches To convert to cubic feet: = 1454.75 / 1728 = 0.842 cubic feet A 12" Type R has a displacement volume of 0.071 cubic feet. I'm assuming this box only holds one Subwoofer as the dimensions wouldn't allow for two. So, we subtract 0.071 from our gross volume of 0.842 to get our net volume. 0.842 - 0.071 = [B]0.771 cubic feet NET VOLUME[/B] Now if you have two of these enclosures, one per sub, you would have a total of 0.771 + 0.771 which equals 1.542 cubic feet. This is the proper size for only one 12" subwoofer; I'd really look into a custom built ported enclosure by one of the designer's on here. Look at BJ Fisher's work; I recommend him. [/QUOTE]

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