Description Yamaha 5.1, NS-C150 (center), NS-B150 (front/surround) The YAMAHA speaker set is made of high-quality materials to provide the best sound experience. These loudspeakers are equipped with special mounting holes on the rear panels of the housing, thanks to which they can be safely and quickly mounted on the wall. The extra large screw speaker terminals are gold plated to ensure maximum signal transmission efficiency. Thanks to this, they perfectly cope with transmitting the HD Audio signal without any quality loss. 1. YAMAHA NS-B150 - surround speakers 2-way system, sensitivity 82 dB / 2.83 V / 1 m, 1.4 cm (1/2") balanced dome tweeter, woofer: 8 cm (3-1/4") dome, frequency response: 60 Hz - 38 kHz, input power: (max/nominal) 60 W / 20 W, impedance 6 Ohm, gold plated sockets, 4 pieces in a set, weight 1.2 kg / pc, dimensions: (W x H x D) 130 x 225 x 127 mm. 2. YAMAHA NS-C150 - center column 2-way system, sensitivity 86 dB / 2.83 V / 1 m, 1.4 cm (1/2") balanced dome tweeter, woofer: double 8 cm (3-1/4") domes, frequency response: 65 Hz - 38 kHz, input power: (max/nominal) 80 W / 30 W, impedance 6 ohms gold plated sockets, weight 2.1 kg, dimensions: (W x H x D) 395 x 130 x 127 mm.