Polk Audio TL 1900 Blackstone 5.1-Channel Home Theater Speaker System 4 satellite speakers. Along with a center-channel speaker for clear, rich sound. The 1/2" silk dome tweeters offer crisp, precise high frequencies. 2-1/2" long-throw composite drivers. With Dynamic Balance technology deliver a flat frequency response with sharp detail for clear, powerful audio. 10" powered subwoofer. Delivers robust bass. Time Lens technology. Helps align the acoustic center of the tweeter and mid-bass driver for enhanced sound. An acoustic lens smoothes the tweeter's frequency response. 500W maximum power handling. Creates powerful sound through the center-channel and satellite speakers. Aperiodic-tuned rear port. Provides improved low-frequency extension without distortion. Curved enclosure design. With nonparalleled surfaces produces less audible coloration from internal surface resonances. Keyhole slot and threaded insert. Keyhole slot and threaded insert 35Hz - 22kHz frequency response (center-channel and satellite speakers). For accurate sound reproduction. 8 ohms impedance. Conducts power to keep speakers working at optimal levels. Height: Satellites: 6-1/2" (each); center-channel: 4" Width: Satellites: 3-3/4" (each); center-channel: 15" Depth: Satellites: 4-7/8" (each); center-channel: 3-1/2" Weight: Satellites: 1.9 lbs. (each); center-channel: 3.4 lbs.