100V ceiling speakers with a rear dome housing to provide an effective barrier against fire. The dome can be removed from the speaker unit for convenient installation into a ceiling cavity, and is fitted with a spring loaded mechanism for the speaker unit to pull into position for a neat flush fit. Screw terminals on the speaker unit offer 4 volume tappings at 100V. Certified to EN54 standard for compliance with fire detection and alarm systems requirements.100V line tappings[tab]0.75W, 1.5W, 3W, 6W[br]Fire rating[tab]EN54-24[br]SPL @ 1W/1m[tab]92dB[br]Frame material[tab]Steel (powder coated)Dimensions[tab]120 x 180mmØ[br]Weight[tab]1.23kg[br]Frequency response[tab]130Hz - 15kHz[br]Cutout[tab]160mmØ[br]Driver[tab]135mmØ (5.25") reinforced paper cone