Swiss audio SW12, 12" (30cm) Bass Drive subwoofer, 200W RMS, 400W MAX Impedance: 4 ohms Frequency Response: 25 - 1kHz, 40oz Strontium Magnet, Sensitivity:. 92dB @ 1W/1m, Airflow Basket, Non Pressed Paper diaphragm , 1.5 "2-ASV voice coil, cut-out: 11:02", depth: 5:16 "