OMNITRONIC PA 6-Zone Stereo Vol-Cont20W bk is an analog stereo volume controller for distributing one stereo amplifier input to six independent zones. Each zone provides a 4-ohm stereo speaker output and is rated at 20 W RMS, for a total rated power of 6 × 20 W RMS. Volume attenuation is adjustable in 10 steps. The unit features screw plug connections, an aluminum front panel, and a 19-inch, 2 U rack-mount housing measuring 48.3 × 23 × 8.9 cm and weighing 3.70 kg.