The OMNITRONIC PA Volume Controller is a mono unit for 100 V line public address systems. Its audio transformer provides attenuation in 11 steps, controlled by the front-panel knob. The controller has a rated power of 45 W RMS, a frequency range of 50–18,000 Hz, and screw plug-in terminal connections. It features a white plastic front panel and housing for flush mounting and includes a 24 V emergency priority relay. An optional finery housing is available.