This high-quality volume controller for 100V PA systems provides precise sound level adjustment in ten steps of -3 dB each, plus an additional zero (off) position. The control is handled by a robust 11-position rotary switch in combination with an integrated 100V transformer—ensuring reliable and low-loss volume regulation for connected loudspeakers.

A special anti-tamper design allows the knob to rotate continuously, preventing mechanical damage from misuse or vandalism—making it ideal for public spaces, schools, or commercial environments. The built-in mandatory signal relay ensures that important announcements are always broadcast, even when the volume is reduced or muted—an essential safety feature in evacuation and emergency scenarios.

The unit fits all standard 55 mm flush-mount wall boxes and comes with a modern, neutral faceplate and frame that seamlessly matches most contemporary switch series. For projects requiring exact visual alignment with existing hardware, the unit can be installed without its included faceplate and frame. The rotary knob can also be replaced if needed.

Technical Details:

Product Type:
– Volume controller for 100V systems

Control Steps:

– 10 steps of -3 dB + 0 position
– 11-position rotary switch, continuous rotation

Transformer:

– Integrated 100V transformer

Safety Feature:

– Built-in mandatory signal relay

Mounting:

– Suitable for standard 55 mm flush wall boxes

Design / Finish:
– Includes neutral faceplate and frame
– Optional use without cover for matching custom switch lines
– Replaceable rotary knob

Applications:

– Public buildings, schools, offices, safety systems, PA installations

Key Features:

– Tamper-resistant rotary switch
– Mandatory announcements always audible
– Clean design with flexible aesthetic integration