Polk Audio T300 Two-way bookshelf Speaker - Pair High efficiency design allows the T Series to reveal the classic Polk Audio sound (open, spacious and clear) even when driven by modestly powered amplifiers and receivers. 1 Fabric/Polymer Composite Dynamic Balance Dome Tweeter with powerful Neodymium magnet structure delivers clear and detailed high frequency response for realistic reproduction of vocals and instruments. One 5-1/4 Drivers provides smooth bass response Bi-Laminate Composite Dynamic Balance Drivers are lightweight and stiff with good damping for high efficiency, excellent bass and lower distortion. Multiple small-diameter driver design delivers a more open, box-less, three-dimensional sound.