AJinFLA, hey you use your speakers yuor way and I use em my way. I have found in my testing that by setting to Large the "subs" actually overpower the mid range and upper frequency and give a "boominess" hence my term for muddy and bloated sounding. I actually prefer my bass tight and well controlled, but hey you prefer boomy bass and there's nothing wrong with that. Each person likes what they like. I would rather have my towers "subs" linear flat to what I know they can handle with no distortion and since my preamp can't do 30Hz I have to settle for a 40Hz crossover
But as mentioned and as the graphs that Tom Noussaine posted in his reviews that below 27Hz the subs in the 7001s drop like a rock, hence adding distortion and sounding bloated, but hey you apparantly like that, so more power to you. Me I chose to use my towers and the built in subs as mid bass modules and let my SVS handle the real low end. I know that the bass in my main HT is tight down to just below 20Hz.
I have not tested the BP7000sc but that may be the one exception where I would set to Large, but again my room response would have a large impact and I would have to run RTA to find the nulls and peaks to tame the speakers, but for now, having my 7001 set to small and knowing that it can handle what I give it works for me. But then again there are people who love Bose too and hey whatever floats their boat.