Height 15" (38.1 cm) Note; Width 8.3" (21 cm); Depth 11" (27.8 cm); Weight 19 lb (8 kg) Note; Crossover Frequencies 2.3 kHz; Enclosure Type Bass-reflex via Rear-firing Port; Finishes Piano Black or High Gloss Walnut; High-frequency Driver Components 1” (2.5 cm) Aluminum Tweeter with Acoustic Lens Waveguide; Nominal Impedance 8 Ohms; Input Connections Binding Posts; Low Frequency Extension 10dB@39Hz -6dB@54Hz -3dB@59Hz; Low-frequency Driver Components 6.5” (16.5 cm) Aluminum Cone, Cast-frame Woofer; Recommended Amplifier Power 50-150; Sensitivity 87 dB