My receiver (Panasonic SA-XR70) has crossover settings of 100Hz, 150Hz, and 200Hz. But I run my main speakers (set to "Large") through my STF-2 and set the sub's crossover to 70Hz. It sounds great this way.
Since I listen to two-channel stereo 90% of the time, I prefer this setup. If I did more HT, I would definitely use the receiver's 100Hz crossover.