Hmm... I thought that I was getting around this with my H/K by setting (all in the receiver, mind you) my mains to 60 Hz, my center to 100, my surrounds to 120, and the sub to 120. I figured that with that last setting, it limits the sub to receiving/outputting nothing above 120Hz from the other channels, and if I set it lower than that, I would have the dreaded hole. Am I wrong?

I am the Doctor, and THIS... is my SPOON!