Summary: Type: coaxial speaker; The number of bands: 2; Power: 50 W (nominal)100 watts (maximum); Sensitivity: 90 dB; Frequency range: 60 - 20,000 Hz; Additional information: Impedance 4 Ohm. Diameter mounting hole 140 mm Polypropylene cone with a special metal coating. Titanium dome tweeter. Strong basket diffuser made of pressed steel.; ...