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<blockquote data-quote="Raven" data-source="post: 2153579" data-attributes="member: 558368">For a smaller woofer, the collective motor and thickness of the basket doesn&#039;t measure up to more than a 3.5&quot; stack of CDs a lot of the time. It looks larger, but the raw displacement of a motor and basket can be very decieving once you realize there&#039;s a pole vent, open space between the spider and motor, only the thickness of material for the basket to add, and how little of the cone is really in the enclosure.Technically, the volume of air held in by the surround being a good 1/2&quot; to 1&quot; outside of the end of the enclosure and the empty space around the woofer where the material was cut away would also count to lower the displacement.EDIT: I did the math, a 10&quot; woofer with a surround 1/2&quot; wide and 1/2&quot; high drops about 0.006782497237438433129 CF from the displacement of the woofer. Add that to 0.038 and you get right around 0.045CF of displacement. That&#039;s more than my (very nicely motored) Aura 10s.Every sub I have own smaller than a 12&quot; displaces less than 0.05 cf; and I just finished using Google, Acoustic Visions, an Aura manual, and RF&#039;s Web Site to double check. Perhaps you need to rethink your logic in all this before you start attacking more experienced members of the forum.</blockquote>

[QUOTE="Raven, post: 2153579, member: 558368"] For a smaller woofer, the collective motor and thickness of the basket doesn't measure up to more than a 3.5" stack of CDs a lot of the time. It looks larger, but the raw displacement of a motor and basket can be very decieving once you realize there's a pole vent, open space between the spider and motor, only the thickness of material for the basket to add, and how little of the cone is really in the enclosure. Technically, the volume of air held in by the surround being a good 1/2" to 1" outside of the end of the enclosure and the empty space around the woofer where the material was cut away would also count to lower the displacement. EDIT: I did the math, a 10" woofer with a surround 1/2" wide and 1/2" high drops about 0.006782497237438433129 CF from the displacement of the woofer. Add that to 0.038 and you get right around 0.045CF of displacement. That's more than my (very nicely motored) Aura 10s. Every sub I have own smaller than a 12" displaces less than 0.05 cf; and I just finished using Google, Acoustic Visions, an Aura manual, and RF's Web Site to double check. Perhaps you need to rethink your logic in all this before you start attacking more experienced members of the forum. [/QUOTE]

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