definitely angle them. high frequencies disappear pretty quickly off-axis.
also, check the audyssey guidelines for placement...but i believe that the 'highs' are supposed to be at 45* spread (left/right) from the listening position, and also 45* azimuth (elevation).
also, check the audyssey guidelines for placement...but i believe that the 'highs' are supposed to be at 45* spread (left/right) from the listening position, and also 45* azimuth (elevation).