Yes I understand ! in that case why not keep the Dayton/fountek RS8 in the list of the available arrays ? it would complement your list with a choice of lower priced design ,for someone like me who cannot afford the Alexandrite or the XT 8 ! Are the Dayton RS 180 drivers the best you can use in it's price range ? what about the vifa P17 or PL 17 drivers ? Thanks