Hi, while it is true about placement flexibility, I just want to point out that the "LF" drivers in floorstanders are not meant to be used as subs, they are intended to be a full range speaker to some degree, with various makes/models extending to different ranges. In general the LF drivers in them are more intended for midbass usage from 80-300Hz. Some do extend lower as part of the full range design but this does not mean you can't use subwoofers with them. If you use say a floorstander with a genuine response to 20Hz and if you subscribe to the multiple sub for smoothing theory then the floorstanders can act as 2 additional subs for smoothing the response, albeit with less flexibility in placement. If you prefer not to use the floorstanders then you can of course use some form of HPF to filter it at whatever desired frequency and let the subs take over from there. I think the floorstanders with actual extended response is for purists who do not wish to use a subwoofer