TypeCenter SpeakerWoofersTweeterFrequency ResponseNominal Input PowerMaximum Input PowerSensitivityImpedanceDimensions (W x H x D)WeightSurround SpeakerWoofersTweeterFrequency ResponseNominal Input PowerMaximum Input PowerSensitivityImpedanceDimensions (W x H x D)Weight NS-P51 Specifications Type2-way acoustic suspension Center SpeakerWoofersDual 10cm (4”) cone Tweeter2.2cm (7/8”) balanced dome Frequency Response70 Hz–36 kHz Nominal Input Power60 W Maximum Input Power180 W Sensitivity92 dB/2.83 V/1 m Impedance6 ohms Dimensions (W x H x D)415 x 135 x 167 mm 16-3/8” x 5-3/8” x 6-5/8” Weight3.2 kg 7.1 lbs./unit Surround SpeakerWoofers10cm (4”) cone Tweeter2.2cm (7/8”) balanced dome Frequency Response69 Hz–36 kHz Nominal Input Power50 W Maximum Input Power150 W Sensitivity89 dB/2.83 V/1 m Impedance6 ohms Dimensions (W x H x D)148 x 252 x 150 mm 5-7/8” x 9-7/8” x 5-7/8” Weight2 kg 4.4 lbs./unit.