VISATON DK 8, 20 Ohm, 15; 10; 5; 3; 1 W/20 Ohm, 107 dB (1 W/1 m) @ 1144 Hz, Ø 214 mm, D: 231 mm, IP 65, re-entrant horn speaker with 100 V transformer. Five-stage level adjustment for 100 V model via knob, in addition 20 Ohm possible. High sound pressure and wide range of frequency response guarantee excellent voice quality.