Hi Rick just wondering what the main differences are between these designs? I want to replace my home theatre setup with a more 2 channel worthy speaker set.. currently using kef q900 and a big subwoofer.. it's good enough for home theatre but doesn't match my desk setup speakers for music quality.. dennis murphy New Philharmonitors with raal tweeter and 5.5" scanspeak revelator midwoofer.. I really love the sound of these. the kef q900 are dual 8" midwoofer but I realized they're slightly big for the room I have them in so I was looking to go down in size slightly.. the ceramica look perfect plus I love the raal sound.. never heard a beryllium dome