The Klipsch KLF may be terrific speakers (I've never heard 'em,so no comment here on SQ either way), but they are 180 degrees opposite from the bose 901 in "application logic". If the idea is wide dispersion from the surrounds for coverage of a very large space, horn speakers are the last thing I would consider. They control dispersion by design and - in the right application -can work very, very well IME. They might be a good choice for L/R/C, however, I don't see how they'd bee good for any of the other channels.
Just my opinion.
Marty