RCF LF21N451

21-inch neodymium woofer with 8 ohm nominal impedance, rated at 1500W AES power handling and 3000W program power. Sensitivity of 98.5 dB across a 30 Hz to 1000 Hz frequency range. Features a 4.5-inch inside-outside copper voice coil with a BL factor of 34.5 T/m, a cone blended from carbon fiber, nylon, and cellulose pulp for structural integrity at reduced weight, and a dual spider suspension with silicon damping. Dual-forced air ventilation manages heat for minimal power compression. Net weight 10.9 kg.