Configure Speaker: Ohm: dual 1 dual 2 P Chamfer: no yes +$10 Cooling: no yes +$40 HiXmCoil: no yes +$20 Daily or SPL: Daily SPL Induct Heat Ring: no yes +$25 Universal: no yes I can't seem to find what these options mean and/or how eeach affects the end product and I would like to order a couple of the Fi 18" BLTs. I will be playing them daily. Does anyone know where these options are explained so that I can decide what to choose and why?