I am in the process of purchasing a jmlabs sib & cub system. (6 sibs) The sub that comes with the system is only 75 watts with a down firing 9" driver. I have the opportunity to get 2 of these subs OR the Chorus SW700 S sub which is a 300 watt front firing 11". Would the 2 subs work better?...They are definitely smaller and better fitting in the room. Any concerns with bass cancellation?...What would offer more volume?