The processor would send only the LFE (.1 channel) via the subwoofer output if you so wished. OTOH, I use 800Diamonds with a subwoofer and bass management to send all the sub-40Hz bass as well. One reason is that the sub can be placed for optimal bass response without compromising that positioning for soundstage and imaging. In addition, there are many useful equalization facilities for subs, both built-in or add-on.
OTOH, I have been amazed and quite satisfied with a system based on 5 competent stand-mounted speakers with 1 or 2 good subs. There is no way for me, or anyone, to say whether going with the big speakers is worth YOUR money. Only you can decide.
N.B.: Good stand-mounted speakers take up as much floor space as floor-standers.
OTOH, I have been amazed and quite satisfied with a system based on 5 competent stand-mounted speakers with 1 or 2 good subs. There is no way for me, or anyone, to say whether going with the big speakers is worth YOUR money. Only you can decide.
N.B.: Good stand-mounted speakers take up as much floor space as floor-standers.