Driver ComplementTweeterQuantity 1 Diameter 1" (2.54cm) Type silk/polymer Dynamic Balance dome Mid / WooferQuantity 3 Diameter 6 1/2" (16.51cm) Type Dynamic Balance bi-laminate cones ElectricalTotal Frequency Response 33Hz-25kHz Upper -3dB Limit 24 kHzLower -3dB Limit 43 HzNominal Impedance 8 ohmsEfficiency 91 dBRecommended Amplifier Power 20-200 watts per channelInputs dual gold-plated 5-way binding posts DimensionsCabinet DimensionsHeight 40" (101.60cm) Width 8" (20.32cm) Depth 14" (35.56cm) Overall Dimensions (including base) 40 15/16" H x 11 1/4" W x 15 5/8" D Product Weight (each) 39.2 pounds