When running my Lightning sub in two-channel mode with the Hawks I simply used the external output (not tape loop, mind you) on my Exposure 3010 integrated, then later my Audio Research preamp had dual outs. I have never felt the need to use the speaker-level inputs and outputs on the subwoofer, although REL claimed that to have the advantage of the subwoofer assuming the sonic characteristics of the original amplifier when their products were hooked up that way.
In my HT setup I'm running the Rainmakers full range and not using the crossover. They can handle the complete signal, and sound better that way.
In my HT setup I'm running the Rainmakers full range and not using the crossover. They can handle the complete signal, and sound better that way.