Polk Audio RTI A9 Floorstanding Speaker (PAIR, Black) You get a pair of Polk Audio RTI A9 Floorstanding Speakers PowerPort bass venting for superior clean, low distortion bass that you can really feel.PowerPort vastly reduces chuffing or port noise and provides deeper, more powerful, lower distortion bass than could be realized with conventional ported or sealed designs of comparable size. Magnetic shielding for safe placement near video sources.  1inch Silk/Polymer Dome Tweeter delivers smooth response and better detail.  Mylar bypass capacitors in the crossovers extend high frequency response and improve detail and transparency. Neodymium magnet, lowviscosity ferrofluid cooling, and a heat sink on the back of the magnet, create better power handling and reliability.  Dual, biampable goldplated 5way binding post inputs (with wide holes for largegauge bare wire connections) for the most secure connections and the most versatile wiring applications. Butyl rubber surrounds for high performance durability  Acoustically inert stamped driver baskets.  Floating antidiffraction grilles minimize grille diffraction for spacious, 3dimensional imaging.