I'm trying not to "watch" my tigers turn their first round game into a nail-biter, so here are some things to keep in mind:

If you leave the fronts set to large, you can select either "LFE Only" or "LFE+L/R" for the sub output. Of the two, I'd lean toward "LFE Only" as it avoids an intentional doubling up of bass signals.

You may want to seriously consider changing your fronts to small and dialing in the crossover point. It's a very rare case where front speakers are really full-range and thus warrant being run as large when there's a sub in the system. What speakers do you have in front?

Strindl is exactly right about the subwoofer controls: set your Sunfires' up so that the onboard crossover is either bypassed entirely ot set to its highest value.

Don't forget to calibrate the system once you have everything else situated.