Frequency Response 36Hz – 150Hz, using the SA1000; Dual 8" Polymer-coated Aluminum Cone Rubber-Surround woofers; Amplifier Power Revel® SA1000 Amplifier, in EQ Switch Position Type 2Weight 28.4 lb (12.9kg); DxWxH 4"x 16- 1/2"x25-3/8"; Mounting Depth 23-1/2" x 14-1/2" ; Nominal Impedance (Ohms) 8 Ohm; Sensitivity (dB@2.83V, 1m) 107dB