QSC LS118 is an active subwoofer with a 4000W Class D amplifier. Its frequency range covers (-10dB) 35Hz to 111Hz and it has a peak SPL of 138dB. On the rear, there is a display with relevant controls to access DSP functions, an analog input and thru output on XLR connectors, 2 RJ45 EtherCON ports, and 2 PowerCON TRUE1 connectors.

QSC LS118 is the subwoofer from the L Class series, powerful, high-performing, and versatile; thanks to its various analog and digital connection options, it is perfect for both simple plug-and-play installations and more complex network configurations or fixed installations. It has two M20 inserts for vertical or horizontal mounting of support poles for QSC LA 108 and LA112 units, and 8 other M10 inserts where eye bolts can be screwed in for suspended installations.

This model features QSC Acoustic Linear Phase (ALP) technology for consistent phase response across the entire listening area, analog connection points for daisy-chaining, and RJ45 ports for using the QSC LS118 in Dante networks and for remote control with the QSC SysNav app. With two or more units, a cardioid configuration can be easily achieved to focus energy on the audience and minimize energy radiated to the rear and sides of the system.

Key features of QSC LS118

• High-level output (138dBSPL peak)


• Specially designed 18" long-excursion cone


• Acoustic Linear Phase (ALP) ensures perfect phase coherence with other QSC speakers and a uniform listening experience across the entire venue


• High-efficiency 4000W peak Class D amplifier


• The QSC SysNav app allows users to design, configure, control, monitor, and apply signal processing to individual subwoofers, entire arrays, or groups of both


• Supports the Dante audio-over-IP protocol for interoperability with other audio equipment and seamless control and monitoring integration into the Q-SYS ecosystem via Q-SYS Inventory Extensions


• Omnidirectional and cardioid modes (the latter requires a minimum of 2 units)


• DEEP mode for enhanced low frequencies


• Robust wooden cabinet with polyurea coating for increased durability even with intensive use


• 4 durable and silent swivel casters

Technical specifications of QSC LS118

Configuration: active direct radiation subwoofer

Woofer: 18" cone

Frequency response: (-6dB) 41Hz-98Hz (-10dB) 35Hz-111Hz

Coverage angle: omnidirectional

Peak SPL: 138dB

Amplifier: 4000W peak Class D

Cooling: variable speed fan

Controls: Rotary push encoder

                      2 buttons

Indicators: Power LED

                        Active limiter LED

                        Stand-by LED

                        2x Signal LED

Connectors: XLR – analog in

                          XLR – analog thru

                          2x RJ45 EtherCON (in/thru)

                          2x PowerCON TRUE (in/thru)

AC input: universal power supply 100–240 VAC, 50–60 Hz

AC consumption: 100 VAC, 3.6 A / 120 VAC, 3.0 A / 230 VAC, 1.7 A

Inserts: 2x M20 (speaker support poles)

                 8x M10 (for suspension mounting)

Color: Black (RAL9011)

Grille: 16GA powder coated

Dimensions: 640×520×790mm

Weight: 50KG

Included accessories: 4 swivel casters, 1 PowerCON TRUE1 cable

Regulations: UL, CE, FCC Class B