Visaton DK8, Loudspeaker, Impedance: 20 Ohm, Power rating: 15; 10; 5; 3; 1 W / 20 Ohm, Sound pressure: 107 dB (1 W / 1 m) @ 1144 Hz, Diameter: 214 mm, Depth: 231 mm, IP 65, Pressure chamber horn loudspeaker with 100 V transformer, Five-stage level adjustment for 100 V model via knob, Additional 20 ohm setting