Originally Posted by
toddalin
I simply set the mic in the listening position because that is the only position that really matters to me. Yes, the 10" and Heil sum at the crossover point and proximate frequencies and it is very easy, even only using 61 bands, to tell the preferred "Z" for the Heil simply by moving it back and forth and tilting it up/down for a slightly off-axis response. Sometimes, the nexus lies in adjusting the slopes/overlap, and the textbook formulas don't always yield the most desireable balance because drivers don't follow textbook impedience/phase/volume curves across their band. This is not only influenced by the components in use, but also the acoustics of the room.
It is also very easy to look at these bands and adjust the crossover frequency/slope to see what provides the smoothest response..., based on its limitations. That's why I like RTA.