Polk TSx550T High Performance Floorstanding Loudspeaker The flagship of the TSx Series is a floorstanding loudspeaker that boasts two 8-inch passive woofers capable of such smooth, natural deep bass extension that you may consider an additional subwoofer to be overkill. (Of course not!) The gorgeous curves and trendy brushed metal accents of this high performance floorstanding loudspeaker make it the perfect addition to any room, and any demanding audio system. Bi-laminate composite cones, tuned with our Dynamic Balance process, produce smooth, natural sound. Silk/polymer dome tweeters deliver clear and detailed highs, without fatigue, even at high volumes. The high efficiency design of the TSx Series works well with practically any electronics. TSx loudspeakers are timbre-matched within their series for seamless speaker-to-speaker blending. A 3-inch critically tuned port minimizes port noise and smooths port air flow for full-bodied bass. Curved enclosure in non-resonant MDF for an acoustically inert cabinet reduces audible coloration. Technical Specifications 1 - 1” (2.54 cm) silk/polymer Dynamic Balance dome tweeter2 - 5 1/4” (13.34cm) Dynamic Balance bi-laminate cone mid-woofer2 - 8" (20.32cm) Dynamic Balance bi-laminate cone subwooferTotal Frequency Response - 26Hz-25kHzUpper -3dB limit - 24 kHzLower -3dB limit - 36 HzNominal Impedance - 8 OhmsEfficiency - 91 dBRecommended Amplifier Power - 20-300 Watts per channelGold-plated 5-way binding postsDimensions - 42 1/2" (107.95cm) H X 9 3/8” (23.81cm) W X 15” (38.10cm) D