QSC GP218-sw – Dual 18-Inch Passive Subwoofer (Black)

Product Overview

The QSC GP218-sw is a premium, high-performance rectangular dual-18-inch passive subwoofer for ground-stacked use in demanding touring and installed concert systems. It combines punch, deep low-frequency extension, and musical accuracy as an ideal companion to the QSC WideLine series and other professional sound-reinforcement systems.

For permanent installations, each cabinet includes sixteen threaded M10 inserts (four per side) for suspension, delivering the same sonic impact as the flyable WL218-sw at a more economical price.

Product Description

The GP218-sw uses two 8-ohm 18-inch woofers with double-layer spiders and triple-roll surrounds for extended, controlled excursion at extreme power. Each 4-inch voice coil is wound on a fiberglass former to resist deformation at high operating temperatures and is extensively vented to reduce power compression, while an aluminum demodulating ring lowers distortion.

It delivers a peak SPL of 140.5 dB (1 m) and low-frequency extension down to 27.4 Hz, with a 31.4 Hz to 240 Hz (±3 dB) response and a 4-ohm nominal impedance. Continuous power capacity is 1700 W with 3000–4000 W recommended amplifier power. The 18 mm Baltic birch plywood enclosure uses independent dual chambers and extensive internal bracing for rigidity and accurate reproduction.

Transport and handling features include four placed handles, an optional transport dolly, and a soft cover. Connections are dual parallel NL4 connectors, and sixteen M10 inserts support suspension in permanent installs. It pairs naturally with QSC WideLine line-array systems.

Key Features

• Very high acoustic output — Up to 140.5 dB SPL (1 m) peak for large touring and concert systems.
• Deep, musical low end — Tight punch with low-frequency extension down to 27.4 Hz.
• Premium long-excursion woofers — Two 18-inch drivers with 4-inch fiberglass voice coils, double-layer spiders, and triple-roll surrounds.
• Low-distortion motor design — Vented voice coils reduce power compression; an aluminum demodulating ring lowers distortion.
• Rigid dual-chamber enclosure — 18 mm Baltic birch plywood with independent chambers and extensive bracing.
• Sixteen M10 inserts — Four per side for suspension in permanent installations.
• Tour-ready handling — Four handles plus optional transport dolly and soft cover.

Typical Applications

• Auditorium
• House of worship
• Multi-purpose room
• Broadcast studio

Technical Specifications

Frequently Asked Questions

Is the GP218-sw powered?
No. It is a passive 4-ohm dual-18-inch subwoofer; QSC recommends 3000–4000 W of amplifier power, with 1700 W continuous capacity.

How does it differ from the WL218-sw?
The GP218-sw delivers the same sonic performance as the flyable WL218-sw but is designed for ground-stacked use, offering a more economical option where flying is not required. It still includes sixteen M10 inserts for suspension.

What systems does it complement?
It is voiced as a companion to the QSC WideLine line-array series and works with other professional sound-reinforcement systems.

What warranty and support come with this subwoofer?
QSC loudspeakers are covered under QSC's standard limited warranty; refer to QSC's published warranty terms for the current coverage period applicable to this model. Creation Networks provides pre- and post-sale support for system design and integration questions.