The general dimensions of the RIVIERA 60W speaker are 118 x 108 x 64 mm , with a weight of 0.66 Kg . | The system for the speaker ref. 13250041 is one-way and 13250042 is two-way . | The maximum power is 60 W , which allows it to reach 88 – 89 decibels (db), a sufficiently high volume for good audibility in both outdoor and indoor environments. | The electrical resistance of this speaker is 4 OHM impedance . | The frequency response of a speaker is the relative volume measure at which the speaker will reproduce different frequencies. This product has a response of 80-18000/20000 Hz . | Product made in Italy, with anti-UV grille .