Does power: 30 w; Does constant impedance input: 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: 1.6 kg; Does the speaker unit specification: 6 "* 1 + 1" * 1;