QSC LS118 – 18-Inch 4000W Powered Subwoofer

Product Overview

The QSC LS118 is an 18-inch 4000W active subwoofer that delivers high-output, low-frequency reinforcement for portable PA, touring, and fixed-installation systems. Built around a long-excursion 18-inch driver and an energy-efficient Class D amplifier, it reaches 138 dB peak SPL and extends down to 35 Hz, anchoring the low end for live music, corporate events, houses of worship, and entertainment venues. QSC Acoustic Linear Phase (ALP) design lets the LS118 combine coherently with QSC line array loudspeakers, while Dante networking and Q-SYS integration make it equally at home in advanced networked AV productions.

Product Description

The LS118 is engineered to scale from simple plug-and-play setups to demanding networked deployments. It provides daisy-chain connections for analog audio, networked digital audio over Dante, and AC power via PowerCON TRUE1, so multiple cabinets wire together quickly. Two or more units can be configured in a cardioid array to maximize low-frequency output in front of the system while minimizing energy at the sides and rear. A selectable DEEP mode extends low-frequency response, and the QSC SysNav System Navigator app lets users design, configure, control, and monitor individual subwoofers, full arrays, or groupings. The LS118 deploys with array frame/ground-stack adapters or on loudspeaker poles in both horizontal and vertical orientations, and is designed to complement the LA112 and LA108 active line array loudspeakers. For an installation-focused powered sub, compare the KS118.

Key Features

• Very high output — 138 dB peak SPL @ 1 m with strong low-frequency performance from a purpose-designed 18-inch (460 mm) long-excursion driver.
• 4000 W Class D amplifier — Energy-efficient module with Power Factor Correction and low AC consumption.
• Acoustic Linear Phase (ALP) design — Provides coherent combination with QSC loudspeakers deployed in the same system for a uniform listening experience.
• Dante and Q-SYS integration — Digital audio-over-IP via Dante plus control and monitoring in the Q-SYS Ecosystem through Q-SYS Inventory Extensions.
• QSC SysNav app — Design, configure, control, monitor, and apply signal processing to individual subs, full arrays, or groupings.
• Omnidirectional or cardioid modes — Cardioid setup (minimum two units) directs low-frequency energy forward and reduces stage-side and rear energy.
• Selectable DEEP mode — Extends low-frequency response for added depth.
• Flexible deployment — 8x M10 suspension points and 2x M20 pole receivers for array, ground-stack, or pole-mount use in vertical or horizontal orientation.
• Rugged, mobile-ready build — Birch plywood enclosure with Polyurea coating and four heavy-duty, low-noise casters.

Typical Applications

• Auditorium
• House of worship
• Multi-purpose room
• All-hands room
• Commercial meeting space
• Broadcast studio

Technical Specifications

Frequently Asked Questions

Can I use the LS118 in a cardioid configuration?
Yes. With a minimum of two units, the LS118 can be configured in a cardioid arrangement to maximize low-frequency output in front of the system while minimizing unwanted energy at the sides and rear. Single units operate omnidirectionally.

How does the LS118 integrate with QSC line arrays?
The LS118 uses QSC Acoustic Linear Phase (ALP) design for coherent combination with QSC loudspeakers in the same system, and is designed to deploy with the LA108 and LA112 using array frames, ground-stack adapters, or loudspeaker poles.

Does the LS118 support networked audio and control?
Yes. It provides Dante digital audio-over-IP and integrates with the Q-SYS Ecosystem for control and monitoring via Q-SYS Inventory Extensions. The QSC SysNav app handles design, configuration, control, and signal processing.

What warranty does the LS118 carry?
Per QSC, the LS118 carries a 6-year warranty when registered within 30 days of purchase. For current warranty terms and registration assistance, contact Creation Networks.