RCF MB15X351

15-inch mid-bass woofer with 8 ohm impedance, rated at 700W continuous power handling and 1400W program power. Sensitivity of 99 dB across a 40 Hz to 2500 Hz frequency range. Built with a 3.5-inch, 2-layer copper voice coil, curved cone, and M-roll polycotton surround, paired with a ceramic magnet and dual-forced air ventilation. Maximum excursion before damage is 40mm, with a resonance frequency of 46 Hz.