Originally Posted by rhed
So now it's either dual S2 or submersive f2 m/s X2 setup. Btw, she does like the looks of the submersives. And she knows it'll be 2 grand more.
The performance delta between (4) 18's and (8) 15's driven by the same amps will be inconsequential. Either system would provide WAY more output than you'll ever use.
Therefore, to my mind, your decision really boils down to aesthetics vs. price. If your wife, (and you), prefer the looks of the F2's, and that preference is worth $2K, (actually it's more like $2.2K + the additional cost of shipping the extra 2 boxes), then go for the F2's. If you don't mind the rather utilitarian looks of the S2's, and you want to save some money, then go for the S2's. Either way, you'll end up with a killer subwoofer system.
PS. My first preference would be to get the F2's and then distribute them around the room rather than stack them in the front. 4 F2's will provide all the output you would ever need and distributing them around the room will provide much better frequency response.
PPS. Don't even think about trying to use the SC II's with either of the systems you're considering above. That would be foolhardy.
PPPS. Once you go to a multi-subwoofer system, you NEED measurement gear to optimize them. Consider getting an REW setup or OmniMic or XTZ.