SP72, have you tried the Klipsches in a biamp setup yet? If they're not the all-hornloaded classic Klipschorn but the more recent hybrid models, and you're passive biamping, you may find a drastic difference in sound level between the hornloaded tweeter section and the (I think) bass-reflex woofer section. Klipsches, of all speakers - though the current JBLs may be another example - might have to be active-biamplified to work right, with each channel's level controlled separately by the active crossover.