The NS-P40 speakers are tuned to deliver a clear soft sound that is pleasant to listen to for long periods. In addition the surround speakers & subwoofer are perfectly matched for smooth sound crossover. They provide a rich expansive sound with both music & movies. Also known as N-SP40 NS-P40 NSP-40. Channel 5.1 Speaker System System Frequency Response 30 Hz?25 k Hz Impedance 6 ohms (without subwoofer) Front Speaker Type: Full-range bass-reflex Driver: 7 cm (2-3/4?) full-range cone Nominal Input Power 30 WMaximum Input Power 100 WSensitivity 83 d B/2.83 V/1 m Dimensions (W x H x D) 112 x 176 x 116 mm; 4-3/8? x 6-7/8? x 4-5/8? Weight 0.59kg / unit; 1.3 lbs. / unit Center Speaker Type: Full-range acoustic suspension Driver 7cm (2-3/4?) full-range cone Nominal Input Power 30 WMaximum Input Power 100 WSensitivity: 84 d B/2.83 V/1 m Dimensions (W x H x D) 276 x 111 x 118 mm; 10-7/8? x 4-3/8? x 4-5/8? Weight 0.73 kg; 1.61 lbs. Surround Speaker Type: Full-range bass-reflex Driver 7 cm (2-3/4?) full-range cone Nominal Input Power 30 WMaximum Input Power 100 WSensitivity 83 d B/2.83 V/1 m Dimensions (W x H x D) 112 x 176 x 116 mm; 4-3/8? x 6-7/8? x 4-5/8? Weight 0.59kg / unit; 1.3 lbs. / unit Subwoofer Type: Advanced YST II with Linear Port Driver: 16cm (6-1/2?) cone Output Power 50 W (5 ohms 100 Hz 10% THD) Dynamic Power 100 WDimensions (W x H x D) 290 x 292 x 327 mm; 11-3/8? x 11-1/2? x 12-7/8? Weight 8 kg; 17.6 lbs.