Introduction Of The QB242 Arrayable Subwoofer

The QB242 is a modular bass element to be used in both permanent and (limited) portable applications. It is designed as a fully-scalable low-frequency extension (LFE) system to the QR24 line-source column system, or as arrayable LFE system with any Alcons pro-ribbon 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 over longer distances.

The controlled (cylindrical) projection of the QR24 can thus be extended down to the lower frequencies by enlarging the LFE array length through adding extra QB242 modules. The lowest usable frequency of one single element is 35Hz.

The Q-systems are the perfect tool in applications where a high directivity and/or a very long throw is required, combined with HiFi output and concert SPL’s, like theatres, churches, Houses of Worship, mobile outdoor sound system and “acoustically challenging rooms”, a.o.

The two direct-radiating 12” Neodymium woofers are mounted in a vented chamber, with large bass reflex ports for excellent breathing capacity, increasing overall output while minimising port-compression. The tight driver arrangement caters for optimal array coupling.

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

The integrated mounting hardware facilitates quick and easy coupling with other QB242 modules; The slim form-factor, QR24-matching design and height of 66cm/26-in., plus the Architect Color Option™, cater for 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 the latest VHIR™ processing, with gain, phase 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.

The QB242 is finished in Durotect™ coating and comes with a 6 years “no-hassle” warranty.

Philip “Dr. Phil” de Haan, head of Alcons Audio R&D: “Our Q-series is the purest form of a line-source array, where we are able to acoustically obtain a pure, virtually side-lobe-free cylindrical projection, without the need for DSP-based beamforming.”

To complete the frequency response of the QR and QM modules down to the lower octaves, Alcons Audo introduces the QB module.

Philip continues: “The Q-series is probably our most underestimated system, as listeners are always surprised by the phenomenal throw and razorsharp vertical directivity control of even a single QR element; And to experience a coherent QB array of 12m/39-ft tall in one of our reference projects is quite impressive!”


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