Well it's not going to be as loud as many of the subs that people use on here tuned 6-8hz higher than what you'd normally tune a lms-R. If you want a sub to play low your going to give up output near tuning to do it vs tuning hiher. That's true of any sub or ported design. It'll lack output vs a pure fartbox yes, but no I doubt 2 12's or 2 15's or whatever you plan will be quiet and it should sound very nice.
