High Frequency Transducer 1" (25mm) Aluminum dome with Acoustic Lens; Low Frequency Transducer 6.5" (165mm) Polycellulose cone woofer; Recommended Amplifier Power 20- 100W RMS; Frequency Response 50Hz-25kHz (-6dB on-axis) Sensitivity (2.83V@1m) 87dB; Nominal Impedance 8ohm Crossover Frequency 3000Hz; Inputs Nickel-plated spring-loaded connectors; Grille Dimensions Dia: 9.4in (239mm); Cutout Dimensions Dia: 8in (203mm); Mounting Depth 4in (101mm); Product Weight (Kg) 1.9Kg