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<blockquote data-quote="Buck" data-source="post: 8781862" data-attributes="member: 591582">This is a thoughtful post.I think you only lose efficiency if your chamshell is too small for the power + cone area.&nbsp; Some woofers now have so much motor force that you can get away with tighter distances or more extreme proximities, to a degree.&nbsp; It&#039;s all relative and situation by situation.Clamshells do have horn-like properties and are more efficient, in general.&nbsp; In a car audio application with a really big system, say a full wall clam, that style can really have some benefits.&nbsp; The depth of the clam and the angle are huge factors.&nbsp; Basically a clamshell becomes a series 6th order when the opening mouth into the environment becomes smaller than the rest of the line.You can take a ported flat wall, let&#039;s say for 4 15&#039;s with a center slot port, and fold it into a clamshell, then keep folding it, and it becomes a series 6th order just after the 2 clam halves are parallel to each other.&nbsp; I guess it&#039;s like a -clam angle lol</blockquote>

[QUOTE="Buck, post: 8781862, member: 591582"] This is a thoughtful post. I think you only lose efficiency if your chamshell is too small for the power + cone area. Some woofers now have so much motor force that you can get away with tighter distances or more extreme proximities, to a degree. It's all relative and situation by situation. Clamshells do have horn-like properties and are more efficient, in general. In a car audio application with a really big system, say a full wall clam, that style can really have some benefits. The depth of the clam and the angle are huge factors. Basically a clamshell becomes a series 6th order when the opening mouth into the environment becomes smaller than the rest of the line. You can take a ported flat wall, let's say for 4 15's with a center slot port, and fold it into a clamshell, then keep folding it, and it becomes a series 6th order just after the 2 clam halves are parallel to each other. I guess it's like a -clam angle lol [/QUOTE]

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