6-zone mono PA volume controller for 100 V line audio systems, featuring six audio transformers, ten-step attenuation, and six built-in 24 V emergency priority relays. The unit provides six 5 W RMS zone outputs and operates across a 50–18,000 Hz frequency range. It has mono input and output, screw plug connections, an aluminum front panel, and a 19-inch rack-mount housing occupying 2 U.