Passive Subwoofer is a low-frequency loudspeaker designed to reproduce deep bass in public address (PA) and professional audio systems, requiring an external power amplifier for operation. Passive subwoofers are widely used in auditoriums, conference halls, event venues, houses of worship, clubs, and commercial installations where powerful and controlled low-frequency reinforcement is needed.

Unlike active subwoofers, passive models offer greater flexibility in system design, allowing installers to choose amplifiers based on required power, zoning, and redundancy. Available in various driver sizes and enclosures, passive subwoofers integrate seamlessly with full-range passive speakers, mixers, and DSP processors.

Compatible with low-impedance and 100V line systems (model dependent), passive subwoofers deliver robust performance, durability, and scalability. They are ideal for fixed installations where centralized amplification and long-term reliability are priorities.