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Car Audio Help
Enclosure Design & Construction
IB vs. oversized sealed enclosure(Theory)
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<blockquote data-quote="soydeedo" data-source="post: 4177469" data-attributes="member: 574991"><p>Now I can't really back this up, but I think I've heard that same sort of lax sloppiness in boxes that were larger than manufacturer sealed specs. Rather than your proposed lack of higher frequency response explanation, could it be that once you are beyond the volume required for the optimal air spring you are actually making the enclosure so large that back waves collide at odd intervals and create discoloration?</p><p></p><p>Basically I'm saying it could be that the volume is too large and the waves are allowed further travel, so before they hit back wall of the enclosure they've lost a significant amount of energy compared to normal operation. On the return trip toward the speaker, this wave's timing is off and hits the cone later and with less energy than it would in its intended volume. That would produce slightly audible sloppiness.</p><p></p><p>The reason IB is OK is because the back wave is pretty much eliminated entirely to the point where any return energy exerted on the cone is negligible.</p><p></p><p>Now I'm really not that knowledgeable about acoustics so please don't crucify me if this is all way off the mark, but I thought I'd propose this line of reasoning just to help you brainstorm. Let me know if I'm thinking about it all wrong, please. =)</p></blockquote><p></p>
[QUOTE="soydeedo, post: 4177469, member: 574991"] Now I can't really back this up, but I think I've heard that same sort of lax sloppiness in boxes that were larger than manufacturer sealed specs. Rather than your proposed lack of higher frequency response explanation, could it be that once you are beyond the volume required for the optimal air spring you are actually making the enclosure so large that back waves collide at odd intervals and create discoloration? Basically I'm saying it could be that the volume is too large and the waves are allowed further travel, so before they hit back wall of the enclosure they've lost a significant amount of energy compared to normal operation. On the return trip toward the speaker, this wave's timing is off and hits the cone later and with less energy than it would in its intended volume. That would produce slightly audible sloppiness. The reason IB is OK is because the back wave is pretty much eliminated entirely to the point where any return energy exerted on the cone is negligible. Now I'm really not that knowledgeable about acoustics so please don't crucify me if this is all way off the mark, but I thought I'd propose this line of reasoning just to help you brainstorm. Let me know if I'm thinking about it all wrong, please. =) [/QUOTE]
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IB vs. oversized sealed enclosure(Theory)
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