Polk Audio R300 Black Two-Way Floor-Standing Loudspeaker Single Acoustically inert MDF cabinet, finished in black. Slim tower design conserves floor space, occupies less than one square foot. Polk Audio's exclusive Dynamic Balance polymer composite driver for smooth wide-range response with low distortion. 0.75" silk dome tweeter with neodymium magnet for clear, detailed highs. Rear-firing bass port for high efficiency and powerful bass response.