< p> PRO Samurai series TS-W3820PRO subwoofer has a nominal power 1800 W and double coil with impedance 2 + 2 ohms. The wide stitched-reinforced urethane surround provides long cone stroke and a secure fit at high volumes. The 4-layer copper-clad aluminum voice coil allows to achieve weight reduction and high sensitivity. The high quality aluminum basket construction dissipates heat away from the voice coil. Big double magnet provides high power.< /p>