Visaton BF 45, 4.5 cm (1.8") miniature speaker with aluminium diaphragm and transparent plastic basket with two mounting holes. Balanced frequency response and very good low range reproduction. Suitable for applications where slim construction and good music and speech reproduction are requested. Rated power 4 W Maximum power 8 W Nominal impedance Z 4 Ohm Frequency response 90–20000 Hz Mean sound pressure level 79 dB (1 W/1 m) Resonance frequency fs 158 Hz Voice coil diameter 17 mm Cutout diameter 45 mm Net weight 0,032 kg