5.1 or 5.0

[jrsystems]

I am reorganizing my system. I have the system set up as a hybrid, when I'm listening to 2 channel, the surround processor and center and surround amps are powered down. So I am torn between running the sub from the preamp or using the LFE in the processor. I lean toward using the preamp outputs directly to the sub.

So my question is, does anyone know anyway that I can send both the LFE signal from the surround processor and the preamp output both to the JL f113 and somehow switch between the two? Assuming not, if I run the subs from the preamp, do I set the front speakers to LARGE in the processor? I assume the processor sees the front speakers and sub as a contiguous pair of speakers. Also, any suggestions for settings on the sub when paired with B&W N802 speakers?

Thanks in advance for any help!