http://manuals.harman.com/hk/Owner%27s%20Manual/AVR%20325,525,4550,5550%20insert%20(FINAL).pdf

I read that as they have high pass settings for the mains, center, and surrounds, and a seperate low pass for the sub. Nowhere does it say to set the sub's own crossover above the highest crossover frequency. It says the H/K has a seperate sub crossover.