Hi Folks,
i was wandering about (mostly) cheap pa coax drivers, that they have the same sd in their manuals and test as a driver would have without a small horn embedded in coil.
So if one for instance would take an emi beta 10 or 12 (and the 8 inch too) they have like these small horns inside their coil for the hf, but should this not be went in the calcultion of the overall sd for the driver as well...? Like ok a twelve inch speaker has an sd of roundabout 500 and whatever square cm...sorry folks i'am metric 😀, and you have to deduct like whatever the horn would be?
Ok one could assume that the dustcab would count into the overall area as well, but in the case of these drivers the dustcab is more like a stiff mosquito net which lets air flow through, so maybe not countable?
Would be glad if someone can elaborate this, and why most manufactors still put it the way they do?!
Greets Swany
i was wandering about (mostly) cheap pa coax drivers, that they have the same sd in their manuals and test as a driver would have without a small horn embedded in coil.
So if one for instance would take an emi beta 10 or 12 (and the 8 inch too) they have like these small horns inside their coil for the hf, but should this not be went in the calcultion of the overall sd for the driver as well...? Like ok a twelve inch speaker has an sd of roundabout 500 and whatever square cm...sorry folks i'am metric 😀, and you have to deduct like whatever the horn would be?
Ok one could assume that the dustcab would count into the overall area as well, but in the case of these drivers the dustcab is more like a stiff mosquito net which lets air flow through, so maybe not countable?
Would be glad if someone can elaborate this, and why most manufactors still put it the way they do?!
Greets Swany
A couple of things to consider
Most Coaxial woofers are low to medium Xmax & total max travel (X-Limit). As such, their surrounds tend to be smaller. So most Coaxial woofers will provide a total net cone area (SD) roughly equivalent to most woofers of similar frame size. The Eminence 8, 10 & 12 inch Coaxial (Beta) woofer(s) are just about average in there respective frame class SD wise. All three have 2" voice coils. So the open area below the porous dust cap is only about 8.0 sq CM. Not enough to make any substantive area loss. On the Beta 12 the open area lost is on the order of a bit less than 1.5%. Hope this helps.
Most Coaxial woofers are low to medium Xmax & total max travel (X-Limit). As such, their surrounds tend to be smaller. So most Coaxial woofers will provide a total net cone area (SD) roughly equivalent to most woofers of similar frame size. The Eminence 8, 10 & 12 inch Coaxial (Beta) woofer(s) are just about average in there respective frame class SD wise. All three have 2" voice coils. So the open area below the porous dust cap is only about 8.0 sq CM. Not enough to make any substantive area loss. On the Beta 12 the open area lost is on the order of a bit less than 1.5%. Hope this helps.