Yamaha NS-SP1800BL, NS-SP1800 5.1 Channel Home Theater Speaker Package NSSP1800BL,NSSP1800 System Frequency Response: 28 Hz - 50 kHz Magnetic Shielding: All Speakers 4 Satellite Speakers Type: 2-way acoustic suspension Drivers: 2.5" cone woofer and 1/2" dome tweeter Input Power (Max/Nominal): 100W/30W Sensitivity: 82 dB/2.83 V/1 m Impedance: 6 ohms Dimensions (W x H x D): 4" x 6-3/8" x 4" Weight: 1.6 lbs (unit) Center Speaker Type: 2-way acoustic suspension Drivers: Dual 2.5" cone woofers and 1/2" dome tweeter Input Power (Max/Nominal): 100W/30W Sensitivity: m 85 dB/2.83 V/1 m Impedance: 6 ohms Dimensions (W x H x D): 11-7/8" x 4" x 4" Weight: 2.6 lbs Subwoofer Type: Advanced YST Dynamic Power: 100 W Output Power (RMS): 50W (5 ohms) Driver: 8" multi-range Dimensions (W x H x D): 11-13/32" x 11-13/32" x 12-29/32" Weight: 18.7 lbs