Crossover Frequencies 2.1kHz; Enclosure Type Bass-Reflex via Rear-Firing 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, 50Hz, 45Hz (-3 dB, -6 dB, -10 dB);