Crossover Frequencies 600Hz, 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 51Hz, 45Hz, 33Hz; Lowfrequency Driver Components 3 x 6.5" Aluminum Cone Woofer; Recommended Amplifier Power 30-200W; Sensitivity 91dB (2.83V @ 1M); Dimensions 44.25" x 9.65"x 12.2" (112cm x 25cm x 31cm)—Including Feet; Weight 50 lbs