Skar audio ddx-12 d2 12 1500 watt max power dual 2 ohm car subwoofer sensitivity (spl) 88.0 db, frequency response 35 500 hz, fs 39 hz, qts 0.34, qms 4.1, qes 0.37, bl 25.5 n/a, vas 24.8 l. Every component used in the design of these woofers is of the highest quality for reliability and increased performance.