LaVoce SAN214.50 21" Professional Subwoofer Driver

 SPECIFICATIONS 3,400 Watts continuous program power capacity (RMS) 116 mm (4.5-inch) copper clad aluminum (CCAW) voice coil 48 mm peak-to-peak excursion (damage point is even higher) 16.6 mm xmax @ 1/3 gap; 21.3 mm usable excursion @ 2/3 gap Neodymium magnet allows a very high force factor and linear excursion Double silicone spider  Optimized cooling system Aluminum demodulating ring for very low distortion 21” Nominal Diameter 98.5 dB sensitivity 33.4 lbs. Available in 4 and 8 Ohm Manufacturer's Datasheet (PDF) USAGE NOTES This super-premium driver from the professional audio world works very well in the MBM-21 cabinet. Two drivers produce upwards of 133dB from 30Hz up and upwards of 135dB at 70Hz.  If you are looking for a clean, impactful, music bass driver, this is an excellent choice. The driver's high efficiency and high resonant frequency allow it to achieve this enormous output with only about 10% as much real power at 70Hz as the UM-18 (one of our favorite home theater dri