A buddy and I were talking about passive radiators, and I mentioned to him that Polk had very successfully used them in their SDA line to lower the frequency output of those 6.5" woofers. Not exactly remembering the specs, I looked up the SRS 2 and Polk claims it goes down to 14Hz! With four 6.5" woofers and a 15" passive radiator, those numbers seem very optimistic, and not an actual 14hz +/- 3db. Is that true? I know the low frequency output is very good due to the design, but just how low does that speaker, or any of the larger SRS line actually go?