Available at B&H Photo Video, Yamaha NS-SP1800BL Home Theater Speaker System features 5.1 channel setup with four 2-way satellites (NS-AP2600S), 2-way center speaker (NS-AP2600C) and 8" subwoofer (YST-SW012) with Half-Pipe port enclosure for minimal noise, 6 ohms impedance, 600 Watt total power, wide 28Hz - 50KHz frequency response, advanced Active Servo Technology for optimal sound pressure, magnetically shielded design for interference free TV video playback.