set speakers large or small?

samll. let the sub do its thing.

I have mine set to large, but best advice is try both and see what works for your system and room. That is how I set mine and determined the result.

Let your ears be the judge.

I own speakers Wilson WP/7's that will play down to approx 28Hz and then start to roll off below that. I still have them set to small. If you have a good sub and it's placed in the room properly and setup correctly it can only help your mains when you really PUSH (over 100db) your system. I again emphasize PUSHING the system! Just observe the mechanics behind it.Let's begin with a larger driver designed specifically to move more air or a smaller driver with less air being moved and working harder to produce the same frequency?