KRK S12 is the second product of the new powered subwoofer line that features a cast frame 12" woofer with a special Kevlar cone. Just like the S10, the S12 has both vertical and horizontal internal braces, and the ports are covered with sound deadening material. Compared to the S10, the S12 has a better low frequency limit (31 Hz) and is 3 dB louder.