5" wall or ceiling acoustic diffuser in steel, dual cone loudspeaker, with 6W (100V) transformer. Selectable power 6-3-1.5-0.75W. Frequency response 190 Hz - 18000 Hz; Sound pressure: max SPL @1m: 100dB; max SPL @4m: 88dB; sensitivity 91dB; coverage angle: 175°. Ceramic inlet and outlet connectors with thermal protection fuse. Material: steel; colour: White - RAL 9010* Dimensions: (W x H x D) 164x164x60mm. Weight 1.9 kg. EN 54 -24 Certification 1488-CPR-0489/W.