Crossover Frequencies 575Hz, 1.8kHz; Enclosure Type Bass-Reflex via RearFiring Port; High-frequency Driver Components 1" Aluminum Tweeter with Acoustic Lens Waveguide; Nominal Impedance 6 Ohms; Input Connections Five-way binding posts; Low Frequency Extension 55Hz, 46Hz, 35Hz (-3 dB, -6 dB, -10 dB); Low frequency Driver Components 3 x 5.25" Aluminum Cone Woofer; Recommended Amplifier Power 30-180W; Sensitivity 90dB (2.83V @ 1M); Dimensions 40.25" x 8.42"x 12.2" (102cm x 21cm x 31cm)—Including Feet; Weight 41 lbs