SUB100V passive subwoofer for 100V loudspeaker systems. Designed for easy mounting on flat surfaces: walls or ceilings. Built-in high-quality 100V transformer with input power selection allows direct connection to 100V loudspeaker lines. Wooden cabinet with 6“ woofer, low pass filter, 100V line power selector, and low impedance input. SUB 100V sharply increases low-frequency performance in background music systems.