@hifidream I appreciate your taking the time to respond.
I think I've seen that 12Hz figure somewhere. I was trying to get an idea of their output level at their claimed low frequency.
By example SVS claims your SB-16's -3dB@16Hz, while Audioholics measured them a very close -3dB@18Hz outdoors.
Regardless, the description and your satisfaction of your systems low frequency performance must be stunning. Enjoy.