I'm trying to determine the best frequency and supertweeter dispersion pattern for a 3-way system with a 15" woofer, a 90x40 CD horn or a 90x40 horn with a dispersion pattern similar to the Altec 511B, with 1" driver, and a supertweeter. The supertweeters I can choose from have 140x40 degree, 40 degree, and 90x40 degree dispersion.