So I have an old Yamaha RX-500U (great by the way) running a pair of Polk Audio RTA 11T's and my friend is letting me borrow his SVS sb-1000 while he's on vacation. I set the sub crossover to 60hz but (using the high level inputs). But now I need to cut off the frequncies 60hz and under to the 11T's, but my amp has no crossover settings. Any ideas?