Driver ComplementTweeterQuantity 1 Diameter 1" (2.54cm) Type Silk/Polymer Dynamic Balance Dome Mid / WooferQuantity 2 Diameter 6 1/2" (16.51cm) Type Dynamic Balance bi-laminate Cones ElectricalTotal Frequency Response 48Hz-25kHz Upper -3dB Limit 24 kHzLower -3dB Limit 58 HzNominal Impedance 8 ohmsEfficiency 91 dBRecommended Amplifier Power 20-150 watts per channelInputs gold-plated 5-way binding posts DimensionsCabinet DimensionsHeight 8" (20.32cm) Width 22" (55.88cm) Depth 9" (22.86cm) Overall Dimensions (including base) 8.0" H x 22 7/8" W x 9 3/8" D Product Weight (each) 18.5 pounds