Leveraging the latest research in acoustic design and the most advanced cabinet and driver technologies, the all-new Alpha tower has dual custom 5¼” (133mm) woofers, while utilizing the Alpha Series’ patent tweeter and crossover design, to deliver bigger and bolder sound with flawless imaging. The new T20 tower is the perfect start to creating the ultimate affordable surround, or stereo system. ¾” (19mm) Black anodized aluminium dome tweeter with front waveguide. Two 5¼” (133mm) Textured polypropylene woofers with rubber surround. Bass reflex cabinet design with a rear-firing port.