Sundown SD-3 Line : In the Works
Thanks to the success of the SD-2 8" model I started developing the SD-3 line; this will replace all SD-2 models in 8/10/12" sizes (there is no 15 in this series).
The SD-3 motor and coil design will become under-hung like the 8" model on the bigger 10 and 12" models -- I am also further optimizing the parameters of all models for sealed enclosures... even the 8" model will be tweaked a bit more. They have the same topology as the 8" -- a 1" top plate and 1/2" long coil -- but the 10/12 design uses a 2.5" diameter coil compared to the 2" on the eight.
As far as release date... by the time prototype is done and production is done probably October or so.
Here she is -- the first full 10" prototype :
I am using an inverted surround to save front mount depth.
My least favorite part of verifying prototypes... cutting them down to check measurements. Also verified that the spider was, in fact, not the correct one. It was too stiff ; in the third pic you can see the spider is two layers but it should be a single layer.
Based on my testing and dissection I am doing another round of prototypes. Actually two versions... one set with only some minor gap modifications (with correct single layer spider), and one set also with a wider magnet in case the spider change itself doesn't get me where I want to be.
So hopefully I will have four more prototypes soon.