The LaVoce SAN214.50 is an incredible 21" subwoofer that features an aluminum frame that optimizes cooling, and an aluminum shorting ring. This driver also features a 98.5 dB sensitivity, which is ideal for mating to other high efficiency drivers. SAN214.50 also features a double silicone spider for improved linearity and an incredible 45 mm peak to peak of excursion. The gasket on this driver allows it to be rear mounted easily, providing additional installation flexibility. To add to the versatility of this driver, the cone has been treated to be waterproof, making it ideal for outdoor cabinets.