Does power: 3.75 W / 7.5 W / 15 W / 30 W / 8 Ω; Does the input: 70 v - 100 - v - 8 Ω; Does frequency response: 90 hz - 20 KHZ; Does the sensitivity: 90 + / - 3 dB; Does the ceiling openings: Φ 200 mm; Does decorative cap size: Φ 230 * 90 mm; Does the installation forms: type suction a top; Does the material: ABS; Does weight: 2.4 kg; Does the speaker unit specification: 6 "* 1 + 1" * 1;