I am considering either a single Rythmik F12 or two SVS SB01000 subs for a small 5.1 Condo system with 5 KEF LS-50 loudspeakers. The cost of either sub option is approx $1,000. I am more interestred in the musical quality possible at this cost rather than low end extension or high output (which is why I am now leaning towards sealed designs). Any opinion on either of these two options would be appreciated.