The QSC WL218-sw is a dual 18-inch passive subwoofer designed as the low-frequency companion to the WideLine line-array system. It can be flown beneath WideLine arrays or ground-stacked, and uses two independent internal chambers, each with its own 18-inch driver, for high-output, extended bass in large touring and installed sound reinforcement rigs.
Key Features
- Two 18-inch drivers (850 W, 8 ohm each) with 4-inch fiberglass voice coils
- Dual independent chambers with long-excursion double-spider, triple-roll surround design
- 4-ohm nominal impedance; 1,700 W continuous / 3,000 W recommended amplifier power
- Maximum SPL of 133 dB continuous, 139 dB peak at 1 m
- Frequency response 37 Hz-200 Hz (±3 dB, no processing)
- Two parallel NL4 connectors for straightforward multi-cabinet wiring
Built for suspended or stacked deployment, the WL218-sw brings deep, powerful sub-bass to concerts, festivals and permanent large-venue installations.