Bill, Thanks for your reply. c-t-c is 3" (not 3" between mid drivers). Are there any drawbacks of crossimg this high( or is it an advantage). Later, If I have to add surround channels, I would go for a smaller surround array with lesser number of mid drivers resulting in about 24" gap between the lowest mid driver and the woofer. Is 300 HZ crossover still fine? Will it not cause any audible detrimental effetcs?