I need a sub for stereo system in the living room (2100 cu. ft). This will be strictly for music powered by a Sonos Connect AMP. The bookshelf are going to be HSU HB-1 MK2, since these are the only well regarded speakers under $300 that will fit my 9 inch shelves. (Any other suggestions are welcomed) I am considering getting the HSU value package 2 ($599), but was hoping to save a few dollars on the sub, as this setup is way over budget now. The LSP 10 is $249 and the stf-2 $359. Also, I'm new to this and really don't understand the specs on both of these subs. This is where your expertise comes in...Thoughts? Thanxs in advance.