The Electro-Voice® EP405 series loudspeaker systems are complete full-range ceiling loudspeaker packages. The package consists of a spring/bezel assembly, grille, rear enclosure, 4-inch full-range loudspeaker and line-matching transformer. The loudspeakers feature 4-inch curvilinear cones with high-linearity treated surrounds together with high-temperature voice-coil assemblies. The 405 series speaker components provide wide and uniform dispersion throughout the critical speech bandwidth. The EP405-8T utilizes a transformer that offers a selection of 1, 2, 4 and 8 watts delivered to the loudspeaker system using either 70-V or 100-V lines.