The Used Mackie Big Knob Passive Volume Controller is a reliable and transparent monitor control solution in great condition. Designed for precise level adjustments without adding noise or coloration, this compact device offers simple yet effective control over your studio monitors. Featuring a passive signal path, it ensures clean and accurate audio output with no external power required. The Big Knob Passive includes two selectable stereo input sources and two stereo outputs, allowing seamless switching between different audio sources and monitor pairs. Its large, tactile volume knob provides smooth and precise control, while independent source selection buttons offer flexibility for your workflow. Built with Mackie's renowned durability, this unit is ideal for home and professional studios looking for an efficient and robust monitoring solution. Whether you're mixing, tracking, or simply fine-tuning your sound, the Mackie Big Knob Passive delivers dependable performance with no unwanted coloration.