The Yamaha 5.1-channel home theater speaker package NS-SP1800BL is a low cost and convenient way to enjoy the full benefits of 5.1-channel home theater sound. They have advanced Yamaha Active Servo Technology (Advanced YST), which is a unique system in which the speaker and amplifier work together to cancel out impedance so the speaker unit has a perfectly linear motion.
Yamaha NS-SP1800BL are 2-way satellite speakers with 2.5″ woofer & 1/2″ tweeter. They have 2-way center speaker with dual 2.5″ woofers & 1/2″ tweeter with magnetic shielding (all speakers),Connector: Type Spring Clip. These speakers are 8″ 100W cube-type high power subwoofer, Wall hanging capability. The NS-SP1800BL is a standalone 5.1 channel speaker package. They are not wireless and requires a surround amplifier which is not included.