The general dimensions of these speakers are as follows: They have a total diameter of between 140 mm – 172 mm and a depth ranging from 62 mm to 97 mm . The distance between the screws is 124 mm – 154 mm . The hole diameter is from 67 mm to 145 mm . | They have a total diameter of between 140 mm – 172 mm and a depth ranging from 62 mm to 97 mm . | The distance between the screws is 124 mm – 154 mm . | The hole diameter is from 67 mm to 145 mm . | The weight of the Riviera speakers varies between 0.88 Kg and 1.55 Kg . | The system of the speaker with reference 13250041 is 1-way , while the rest of the speakers have a 2-way system. | The maximum power is between 80 W – 120 W , allowing it to reach about 90 – 92 decibels (db), which is loud enough for good listening in both outdoor and indoor environments. | The electrical resistance of these speakers is 4 OHM impedance . | A speaker's frequency response is the measure of the relative volume at which the speaker will reproduce different frequencies. These products have a response of 55-16000/20000 Hz . | These speakers have a protection rating of IP 44 .