LR28B - larger-format line-array bass

  • High-performance line-array LFE system for larger applications
  • Stackable and flyable with LR28 line-array or in separate curved arrays
  • Maximum deployment flexibility also in cardioid - and end-fire arrays
  • Neodymium dual-coil 18” drivers with lowest possible distortion
  • SIS™ pre-wired for very high system damping and further reduced distortion
  • Front-positioned NL4 connector for easy cardioid connection

Product description

The LR28B is the dedicated low-frequency extension to the LR28 pro-ribbon line-array. It can also be combined with any other Alcons pro-ribbon system, in both permanent and portable applications.

The front-loaded system delivers a super accurate bass and sub response with highest output under lowest distortion, due to the super long-stroke 18” woofers. This new-generation transducer is fitted with a large, dual- 4.5” voice-coil Neodymium motor, enabling a significantly-extended excursion*, while maintaining a high sensitivity. Specific attention in this design has been paid to obtain lowest possible distortion, as a perfect match with the pro-ribbon systems. The centrally-located X-Venting™ port design combines further increased output with low power compression. *(not included in SPLpeak spec).

The LR28B can be used as single subwoofer or in multiples; As end-fire or cardioid array; Together with LR28 or in separate sub-only arrays. All functionality is possible in stacked or flown configurations bringing ultimate deployment versatility.

Rated for a high WorkingLoadLimit with 1:10 safety ratio, the versatile rigging system, with front and rear splaying possibility, enables straight or pre-curved flown (cardioid) arrays, to be flown above, besides or behind an LR28 (or any other) line-array.

Array configurations can be simulated through the LR28 GLL in the Alcons Ribbon Calculator (ARC), Alcons’ high-resolution 3D simulation program.

Mobile (cardioid) stacks of up to 3 units can be transported through the PRRGLR28B pre-rig, including stack-specific softcover.

For full system performance, the LR28B is to be driven and controlled by the ALC amplified loudspeaker controller; Driven by the ALC, the LR28B delivers full operation flexibility, maximum sound quality and output power with long-term operation reliability.

The Signal Integrity Sensing™ pre-wiring ensures complete cable/connector compensation between the LR28B and ALC, significantly increasing response accuracy and reducing both linear and non-linear distortion to an absolute minimum, regardless of cable length and system impedance.

Dimensional drawing

Technical specifications

Frequency response 34 Hz - 200 Hz (+/- 3 dB)
29 Hz -        (+/-10 dB)
Sensitivity nominal 103 dB (40 - 100 Hz)
Nominal impedance 4 ohms
Recommended drive Sentinel10, max. 1 pce. per channel (4 ohms)
Nominal SPL peak 131 dB (Sentinel3 40 - 100 Hz)
  137 dB (Sentinel10 40 - 100 Hz)
  142 dB (comparative)
Dispersion H x V     omni / (hyper) cardioid in array with processing

Physical specifications

System Subwoofer
Drivers LF 2x AW18.452ND-8 18”, vented
Connectors 3x Speakon NL4 input / link
Physical dimensions      mm                 inches
Height 596                   23,4
Width 1200                 47,2
Depth 660                    26,0
Weight (approx.) 85 kg               187,4 lb
Warranty 6 years limited

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