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<blockquote data-quote="spencer321" data-source="post: 6165541" data-attributes="member: 599233">no, 2 18&#039;s will probably require even more space than 4 or 5 10&#039;s, for instance... most 18&#039;s require at least 5 cubes net per subwoofer to perform efficiently, so 2 18&#039;s would take a 10ft^3 box, where as 5 10&#039;s would take ~ 7.5ft^2 but 2 18&#039;s would be more comparable to 7 or 8 10&#039;s which could be anywhere from a 8ft^3 to a 12ft^3 boxeffective piston area is the portion of the cone which is effectively moving air basically, in other words, the subwoofer may be 10&quot; overall diameter, outside to outside, but the cone surround is not completely considered part of the effective piston area, normally you only count 1/3 to 1/2 of the surround as part of your piston area. in other words, if you have a 10&quot; sub with a 1&quot; surround you only have an 8&quot; cone but you add 1/3 to 1/2 of the surround to get your total effective area the numbers &quot;i no mad&quot; is giving you are not accurate</blockquote>

[QUOTE="spencer321, post: 6165541, member: 599233"] no, 2 18's will probably require even more space than 4 or 5 10's, for instance... most 18's require at least 5 cubes net per subwoofer to perform efficiently, so 2 18's would take a 10ft^3 box, where as 5 10's would take ~ 7.5ft^2 but 2 18's would be more comparable to 7 or 8 10's which could be anywhere from a 8ft^3 to a 12ft^3 box effective piston area is the portion of the cone which is effectively moving air basically, in other words, the subwoofer may be 10" overall diameter, outside to outside, but the cone surround is not completely considered part of the effective piston area, normally you only count 1/3 to 1/2 of the surround as part of your piston area. in other words, if you have a 10" sub with a 1" surround you only have an 8" cone but you add 1/3 to 1/2 of the surround to get your total effective area the numbers "i no mad" is giving you are not accurate [/QUOTE]

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