Nakamichi NSW-Z1206D2 is a 12-inch (316mm) DVC subwoofer with a nominal impedance of 2 ohms + 2 ohms and a power rating of 600W RMS. It has a sensitivity of 85.4+3 dB and a frequency range of 45~1.3k Hz. The voice coil diameter is 260mm and the voice coil length is 40mm. The air gap height is 8mm and the magnet dimension is D160 x 20mm. The resonant frequency is 30.3 + 3 Hz and the D.C. voice coil resistance is 2 ohms. The mechanical quality factor is 3.26, the electrical quality factor is 0.78, and the total quality factor is 0.63. The equivalent air volume to Cms is 63MPL and the mechanical