5" wall or ceiling acoustic diffuser in steel, dual cone speaker, with 6W (100V) transformer. Selectable power 6-3-1.5-0.75W. Frequency response 100 Hz - 20000 Hz; Sound pressure: max SPL @1m: 100dB; max SPL @4m: 88dB; sensitivity 94dB; coverage angle: 180°. Ceramic inlet and outlet connectors with thermal protection fuse. Material: steel; colour: White - RAL 9016* Dimensions: Depth: 75mm; Diameter: 195 mm. Weight 1.61 kg. EN 54 -24 Certification 1488-CPR-0488/W.