QSC Pro audio LS118

An 18-Inch Subwoofer Designed to Complement the QSC Ecosystem

The QSC LS118 was designed as an active subwoofer that naturally integrates into an existing QSC system, with a deployment logic oriented towards both live performance and installation. Its role is clear: to provide solid reinforcement in the low-frequency spectrum while remaining easy to integrate into an existing rig, whether working in analog or networked setups.

In this perspective, it pairs ideally with QSC LA108 or LA112 tops, both in ground-stack configurations and pole-mounted. Its form factor allows for horizontal or vertical installation to adapt placement to the venue, stage layout, and traffic constraints, all while maintaining a clean and coherent system approach.

Intended Uses and Target Audience for the QSC LS118

The LS118 is aimed at rental companies, theaters, clubs, performing arts venues, and fixed installations seeking an 18-inch subwoofer that is both powerful, directional, and quick to deploy. It performs particularly well in contexts where a clear low end is desired without muddying the mix: amplified music, DJ events, corporate events, speeches requiring clean low-mid frequencies, or as reinforcement for compact systems needing more authoritative bass.

On the ground, its philosophy is "efficiency without complications": you can opt for a plug-and-play XLR configuration or switch to an audio-over-IP architecture via Dante for larger stages, simplified distribution, and redundancy scenarios. The result is a subwoofer that targets both sonic performance and operational reliability, from fast setup to teardown.

Technologies and Deployment Advantages

QSC Linear Phase (ALP): More Natural Integration in the Low End

QSC ALP linear phase technology is designed to improve temporal coherence and facilitate acoustic summation with other QSC speakers. Practically, this helps achieve a more stable low end in the crossover region, with fewer "null" effects caused by cancellations, and a bass sensation better "anchored" to the rest of the system. In live use, this translates to a more homogeneous sound across listening positions and a smoother setup process when time is tight.

Dante and Chaining: Modern Connectivity for Clean Stages

The LS118 offers simple analog chaining via XLR, convenient for direct configurations and quick stage plots. Additionally, Dante over RJ45 opens the door to networked audio: a real advantage when distances increase, the number of audio points expands, or centralized distribution and routing are desired. On the power side, PowerCON TRUE1 enables clean and secure power chaining, appreciated for reducing power strips, speeding up cabling, and keeping the stage tidy.

Cardioid Bass: More Impact for the Audience, Less Stage Pressure

In many venues, the challenge is not just having bass but controlling it. With two or more LS118 units, the cardioid configuration focuses energy forward and reduces rear leakage. This is a tangible benefit for improving stage comfort, limiting bass in microphones, and better respecting neighborhood or sound level constraints in sensitive environments.

Flexible Placement: Adapt to the Venue Without Losing Efficiency

The LS118 suits multiple scenarios: ground-stack stacking, pole mounting under LA108/LA112 tops, horizontal or vertical orientation depending on available space and desired coverage. This flexibility helps optimize placement on small stages as well as larger setups, prioritizing traffic flow, stack stability, and system coherence without sacrificing the expected impact of an 18-inch subwoofer.

Technical specifications

Battery	No	EQ	7-band
Frequency response - start	41 Hz	Cutaway	No
Frequency response - end	98 Hz	SPL max	138 dB
Category	Soundsystem	Speaker structure	wood
Type	line array	Inputs	XLR, powerCON, RJ45, Ethercon
Peak power	4000 W	Outputs	XLR, link XLR, powerCON, RJ45, Ethercon
Number of channels	1 channel	Color	Black
Amplification	Active amplified	Finishing	Black & chrome
Application	Facade	Power output	2000 W
Auto-standby	Yes	Power / type	RMS
Bluetooth	No	Mounting	2 x M20
Connection	XLR Link, RJ45, Ethercon, Powercon True1, XLR	Weight	50 kg
Speaker diameter	18"	Dimensions (mm)	640 x 520 x 790
Number of speakers	1

RMS Power	2,000 W	Power Supply	PowerCON TRUE1
Frequency Response	41 Hz - 98 Hz	Enclosure Material	ABS
Max SPL Level	138 dB	Deployment	Ground-stack or pole-mounted, horizontal or vertical position
Network Audio	Dante	Dimensions	640 x 520 x 790 mm