CLS 121S

Lynx Pro Audio

Subwoofer 21″ (53cm) Active 3000W

Subwoofer unit in direct radiation configuration

Compact & extremely powerful, self-powered (3000W Class-D with PFC), DSP integrated subwoofer unit in direct radiation configuration. 21” (4” voice coil) neodymium transducer.


The CLS-121S is a high-output, extremely powerful sub-bass element designed to be used in unison with the coaxial CLS-212 line array module.

It uses one low distortion 21” (4” QUATTRO in/out copper voice coil) custom speaker with double silicon spider with optimized compliance, exclusive Malt Cross Technology cooling system for reduced power compression and aluminium demodulating ring for very low distortion.

Designed to be used either as a standard sub bass unit or easily configurable in cardioid configuration thanks to integrated front & rear power connectors enable a discreet installation without any cables visible at the front of the cluster. The extra strong, especially designed internal wooden reinforcements reduce unwanted vibrations eliminating any noise, lowering distortion and delivering a clear sound. At the same time, the bass port is designed with a flare to eliminate any turbulence caused by sharp edges in the sound waves path.

The 3000W Class-D amplifier with PFC (Power Factor Correction) offers exceptional efficiency with maximum system performance whilst significantly lowering power consumption. With Thermal, short-circuit and overload protections the system module delivers an outstanding sonic performance. Coupled together with our new generation, 64 bit/96KHz processor the system electronics are yet further guaranteed not only the utmost protection but the best performance.

Designed in-house by Lynx Pro Audio engineers our DSP offers the most recent advances in digital processing such as FIR filters delivering a linear phase & frequency response. The latest 32 bit/96KHZ AD/DA converters make the system one of the most advanced & innovative line arrays on the market resulting in superior sound quality.

A 2.8” IPS user interface is located on the enclosure’s back panel and has multifunction joystick control enabling the user to control, select and/or adjust parameters such as cabinet presets, gain, delay and input EQ (see user manual). Two Ethernet ports enable the system to be controlled with the OCS platform for easier alignment, monitoring and processing of the array and together with the new Rainbow 3D prediction software delivers a complete system design tool.

The enclosure is made from premium grade birch plywood and finished with a polyurea coating for longer durability & weather protection. It also has a number of dedicated accessories available and the 4 point rigging system which includes 2 front automatically rising plates and 2 rear points which enable 10 CLS-121S cabinets to be flown in a single array or together with the CLS-212.

Key features

  • Extraordinary high power output
  • Integrated Digital processor (64 bit / 96 KHz)
  • Front & rear audio and power connectors for cardioid applications
  • Ergonomic design in premium birch plywood & finished in polyurea
  • 2.8” IPS display with multifunction joystick control
  • Stackable and flyable standard and/or cardioid configuration

Perfectly suited for:

→ Touring and fixed installations
→ Sports stadiums
→ Houses of worship
→ Club installations
→ Concert halls and auditoriums
→ Low frequency complement for CLS-28


Subwoofers (Pro)

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Technical Specifications:

Components LF: 21” Neodymiun magnet transducer. 4” quattro in/out copper voice coil, Waterproof cone treated on both sides. Malt Cross Technology cooling system. Aluminium demodulating ring for very low distortion. 1600 W (AES)
Frequency Range  30 Hz – 90 Hz (preset 90 Hz)
Max SPL/Peak* 131 dB / 137 dB
Rated Power 3000W Class D with switching power supply & PFC
Dispersion Quasi omnidirectional
Connectors USB (DSP programming)
Dual Ethernet port, Online Control System
Input BAL/ UNBAL XLR connectors analog input + loop AES/EBU digital input + loop
Finish Polyurea coating, high grade resistant paint
Material 15 mm / 18 mm premium birch plywood
Dimensions 608 x 800 x 778 mm (H x W x D) / with pins 814.5 mm (W)
Weight 64 Kg (141 lbs)



Product Datasheet

Product Manual