Polk Audio's R150 Bookshelf Speakers - Building incredible-sounding speakers at reasonable prices has made Polk Audio a powerhouse in the audio industry. The R Series Loudspeaker models continue the Polk tradition of using high quality materials and excellent fundamental engineering to deliver exceptional sound at an exceptional value. R Series Loudspeakers are perfect for building starter systems, or for small room or multi-room applications. With the addition of a PSW Series powered subwoofer, you can assemble an impressive home theater system on a budget. Use them as surrounds in a den or bedroom system. Wall mount them in your workshop or basement rumpus room for industrial strength durability and great sound.