Polk Audio RTiA7

The RTi A7 uses multiple long-throw 7-inch woofers to combine the wide dynamic range benefits of a single larger woofer with the tight, punchy, accurate bass response of small woofers. Combined with PowerPort Plus, these multiple woofers deliver deep, high-impact bass with speed and accuracy. Features: -Three-way floorstanding speakers, with 165mm (6 1/2") polymer composite drivers -Features 2 x 178mm (7") polymer composite drivers for bass with slam -Timbre-matched bookshelf & in-ceiling / in-wall speakers also available -1-inch Silk/Polymer Dome Tweeter delivers smooth response and better detail. -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. -Mylar bypass capacitors in the crossovers extend high frequency response and improve detail and transparency. -Acoustic Resonance Control (ARC Port) technology for more natural midrange reproduction. -Neodymium magnet,low-viscosity ferro-fluid cooling, and a heat sink on the back of the magnet, create better power handling and reliability. -Dual, bi-ampable gold-plated 5-way binding post inputs (with wide holes for large-gauge bare wire connections) for the most secure connections and -Butyl rubber surrounds for high performance durability. -Acoustically inert stamped driver baskets. -Floating anti-diffraction grilles minimize grille diffraction for spacious, 3-dimensional imaging.