Driver ComplementTweeterQuantity 1 Diameter 1" (2.54cm) Type Dynamic Balance Silk/Polymer Dome Mid / WooferQuantity 2 Diameter 6 1/2" (16.51cm) Type Dynamic Balance Bi-Laminate Cones ElectricalTotal Frequency Response 33Hz-25kHz Upper -3dB Limit 24 kHzLower -3dB Limit 45 HzNominal Impedance 8 ohmsEfficiency 90 dBRecommended Amplifier Power 20-150 watts per channelInputs dual gold-plated 5-way binding posts DimensionsCabinet DimensionsHeight 37" (93.98cm) Width 8" (20.32cm) Depth 12" (30.48cm) Overall Dimensions (including base) 37 7/16" H x 11 1/4" W x 13 3/8" D Product Weight (each) 29.9 pounds