Sub Woofer set up


Confused on how to set up my Main speakers with my sub. I have full range front speakers (Silverline Sonata MK.lll) and the Silverline center channel.  Rear speakers are also full range. My sub is the GoldenEar Technology forcefield One. I am using the LFE sub output. Should I set all speakers to small and subwoofer to Yes to direct all bass and LFE information to the sub or set all speakers to large and sub woofer to No to direct all bass and LFE to the L/R Main speakers and therefore the Sub.
cavy
https://www.soundstagenetwork.com/measurements/silverline_sonatina_iii/

Your mains start to lose output at just 100Hz anechoic (they are also decently v-shaped, unless you listen at low levels).

So yeah, all speakers should be set to Small and the crossover set to where they fall off in room (60Hz-80Hz for your mains). For those of you that do measurements, this would be the -6dB point in-room when playing a loud test signal. 
 
You don’t want both speakers and sub playing, as they will have various phase cancelations across the shared frequency range. This should be done if you truly have immense localization problems and don’t care about the phase cancelations.
Hmmm. What about the option to set all speakers to large and sub to yes?