The all new CompR sub is the very model of power and reliability. Play them all day. They love it as much as you do. The CompR Eight-Inch Subwoofer is a 4 Ohm dual voice coil design, making it easy to get the most out of your amp. The CompR Eight-Inch Subwoofer works best with a sealed or ported enclosure and 300 watts of recommended power. Recommended Amplifiers CX Monoblock. Size – 8″ (20 cm) – Impedance – 4 Ohm Dual Voice Coil – Peak Power – 600 W – RMS Power – 300 W – Sensitivity – 82.1 dB 1w/1m – Mounting Depth – 4 1/8″ (10.5 cm) – Mounting Diameter – 7 (17.7 cm) – Min Sealed Box Vol – 0.4 cu ft (11.3 L) – Max Sealed Box Vol – 1.0 cu ft (28.52 L) – Min Vented Box Vol – 0.8 cu ft (22.7 L) – Max Vented Box Vol – 1.2 cu ft (34 L).