QB242 - modular low-frequency array column

  • Modular scalable LF column array system, for each size venue / application
  • Tight driver arrangement for optimal array coupling
  • All-Neodymium 12” drivers for excellent performance-to-weight ratio
  • Height and design-matching with QR24 and QM24 systems
  • SIS™ pre-wired for very high damping and further reduced distortion
  • Shallow form factor and ACO™ color option for unobtrusive, “stealth” installation

Product description

The QB242 is a modular column bass system to be used in both permanent and (limited) portable applications. It is designed as the low-frequency extension (LFE) system to the Q-series line-source column systems; However, it can be used as arrayable LFE system with any Alcons system.

The QB242 can be stacked or flown in multiples, making it an ideal building block to form bass arrays, for obtaining low frequency projection and throw control in acoustically challenging spaces or long-throw applications. The controlled (cylindrical) projection of the Q-series can thus be extended down to the lower frequencies by enlarging the LFE array length through adding extra QB242 modules.

The 8 ohms system impedance, makes for a very efficient amplifier channel loading, when assembling arrays of multiple units.

The LF-section delivers a super accurate response with highest output under lowest distortion possible. The new-generation 12” transducers are fitted with a large, dual-3.5” voice-coil Neodymium motor, enabling a significantly-extended excursion, while maintaining a high sensitivity.

The direct-radiating Neodymium drivers are mounted in a vented chamber, with large, symmetrical-positioned bass reflex ports for excellent breathing capacity, increasing overall output while minimising port-compression.

The integrated mounting hardware facilitates easy coupling with other QB242 or QR24/QM24 modules; The shallow form-factor, QR24-matching height and design and the Architect Color Option™, enable a perfect integration.

The QB242 is powered and controlled by the ALC amplified loudspeaker controller; Through the integrated processing and feedback, the ALC offers QB242-specific drive processing with optimal response and long-term reliability. The integrated factory presets in the ALC drive processor offer gain, phase, array-length and filtering matching with all Alcons top systems.

Through the Signal Integrity Sensing (SIS™) pre-wiring, the cable-length and connector resistance between the QB242 and ALC is dynamically compensated (system damping factor 10.000), further reducing distortion, while increasing response accuracy.

Dimensional drawing

Technical specifications

Frequency response 43 Hz - 250 Hz (+/- 3 dB)
  35 Hz - (+/-10 dB)
Sensitivity nominal 98 dB (40 Hz – 100 Hz)
Nominal impedance 8 ohms
Recommended drive Sentinel3 min.
Nominal SPL peak 124 dB (Sentinel3 40 Hz - 100 Hz)
  130 dB (Sentinel10 40 Hz - 100 Hz)
  135 dB (comparative)
Dispersion H x V (single) omni

Physical specifications

System subwoofer, front-loaded
Drivers LF 2x AW12.352ND-16 12”, vented
Connectors 2x Speakon NL4 input/link
Physical dimensions  mm                 inches
Height 658                   25,9
Width 367                   14,4
Depth 500                  19,7
Weight  26 kg               57,3 lb
Warranty 6 years limited


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