Looks quite a decent setup. I am not sure with me having been around a while and my hearing not as good as it once was not sure I need to go below 20Hz. More the feel of it through the floor than any waves through the air.
I mostly see it as something I might recommend to friends / family if they want a smaller setup. 4 of the smaller surround speakers and the smaller centre for a minimalist look, not too expensive and decent sounding for the money. Coupled with a BK Gemini 2 and that's a pretty nice WAF friendly system for a reasonable price.