The Celestion FTR18-3060F is a very responsive, cast frame 18 inch subwoofer speaker with 3 inch voice coil for high volume operation over long periods of time. Designed for FOH and DJ subwoofer cabs, the 3060F features a rigid, reinforced glass loaded paper cone and large 80oz magnet because the bigger the magnet, the more powerful the motor that drives the sound. Rated at 400 watts long term operation and 800 watts Music Program with 96dB sensitivity so you get a lot from your watts. 8 ohms.