Hi all. I'm thinking of hooking up my old psw110 to my low powered 2ch setup...wanna add some deeper low end to my music. Since my shelf system has no sub out I'll be using the speaker level inputs n outputs. My question is...given the low wattage of the system (25 watts per channel), will it be enough for the sub? I never understood how the speaker level connections on the sub worked...is it just another xover?? Would this setup free up the shelf systems amp power to drive my bookshelf speakers better b/c of the low end going to the sub?? Any thoughts would be a great help. Thanks!