For now I would like to find a driver (hopefully a compression driver) for 100Hz to 400Hz
SD 370 schould work quite good .
But you can try also my modified K55 :analog-forum.de/wbboard/gallery/index.php?image/79685/analog-forum.de/wbboard/gallery/index.php?image/71708/
-which is optimised for WE 15a installations.
Reg. Dietmar