WB806 8" Fullrange Ceiling Speaker8 Ohm ImpedanceRecommended Amplifier Power:5--20WattsFrequency Response: 60--20000HzSensitivity: 90dB/W/MDimensions: Φ 282*133 mmWall Cutout: Φ 243 mm More WB805 8" Fullrange Ceiling Speaker8 Ohm ImpedanceRecommended Amplifier Power:5--20WattsFrequency Response: 60--20000HzSensitivity: 90dB/W/MDimensions: Φ 271*110 mmWall Cutout: Φ 242 mm More WB656 6.5" Fullrange Ceiling Speaker8 Ohm ImpedanceRecommended Amplifier Power:5--20WattsFrequency Response: 70--20000HzSensitivity: 89dB/W/MDimensions: Φ 246*110 mmWall Cutout: Φ 205 mm More WB655 6.5" Fullrange Ceiling Speaker8 Ohm ImpedanceRecommended Amplifier Power:5--20WattsFrequency Response: 70--20000HzSensitivity: 89dB/W/MDimensions: Φ 232*95 mmWall Cutout: Φ 202 mm More WB506 5" Fullrange Ceiling Speaker8 Ohm ImpedanceRecommended Amplifier Power:5--20WattsFrequency Response: 80--20000HzSensitivity: 88dB/W/MDimensions: Φ 128*95 mmWall Cutout: Φ 180 mm More WB505 5" Fullrange Ceiling Speaker8 Ohm ImpedanceRecommended Amplifier Power:5--20WattsFrequency Response: 80--20000HzSensitivity: 88dB/W/MDimensions: Φ 215*85 mmWall Cutout: Φ 186 mm More