I've done both, with my Parasound HINT which has bass management system I can high pass mains and low pass the sub. Running the mains full range gives me the best full range sound with my sub. I like the bass from my mains so why would I cut them off?? You lose some dBs cutting the mains and a bit of detail from the lows as you don't want to hear anything from the sub but you do want what it adds to say the stand up bass.
I have the HINT low pass at 40Hz, volume at about 50% and phase at about 130 deg on the sub. I can put my ear about 12-18" from my sub and I don't hear anything, if I turn the sub off its the same but a bit less low end detail and volume.
My mains have 8" woofers so why would I want to reduce the amount of air I can move by only using the subs 12" driver?
I think running your mains full range is the best way to go.
I have the HINT low pass at 40Hz, volume at about 50% and phase at about 130 deg on the sub. I can put my ear about 12-18" from my sub and I don't hear anything, if I turn the sub off its the same but a bit less low end detail and volume.
My mains have 8" woofers so why would I want to reduce the amount of air I can move by only using the subs 12" driver?
I think running your mains full range is the best way to go.