S12's Frequency response - 25 Hz - 200 Hz (+0/-3 dB).
For ported box with 12" driver and 300W amp it's somewhat ok, guess, but at $340 it's hard to complain, besides the box size is quite small. I think they could've gotten more performance out this system with larger front ported box.
between HSU's VTF1-MK3 ($369+$52 s/h)and this it would easy choice - I'd go with emotiva at current pricing.