I would l always keep the two KC62. If you want more power and extension, just add one or two larger ones. Subs don't have to be identical. But do get a mic, and get some dsp room eq system. That will transform the sound. If you are reluctant to get very technical, the DSpeaker X2 is the easiest option.
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Yes not at the same time of courseit con do 11hz at some puny level and 110dB at at much higher frequency ? Have someone done proper measurements ( Erin ? ) maybe it cannbe deduced from there ?
I read somewhere that 11 Hz, -3 dB (Room EQ) was mentioned in their white paper as a room reinforced measurement, not anechoic. Even my old Sunfire TS ii can achieve a measurable response down there like that, so I don't doubt what they claim in controlled conditions. But yeah, those not read in like those here, could easily lump the peak output to go along with that level of extension.