LR18/120 - compact mid-size line-array module

  • High-performance, wide dispersion line-array system for small to medium applications
  • HiFi sound quality at concert Sound Pressure Levels
  • 7” pro-ribbon HF section with exceptional intelligibility and “throw”
  • Maximum dynamic headroom reserve with lowest possible distortion
  • Fully symmetric and coherent pattern control in horizontal and vertical plane
  • SIS™ pre-wired for very high system damping and further reduced distortion

Product description

The LR18/120 is a 3-way, “compact-mid-size” format line-source sound system, combining the highest sound quality possible with very high SPL capabilities and throw.

By implementing Alcons’ pro-ribbon technology for mid and high frequencies, a super-fast impulse response with up-to-90% less distortion is achieved. This enables the LR18 to offer a fully intuitive linear response, with perfect intelligibility and non-compressed identical tonal balance at any SPL.

The all-natural cylindrical wavefront of the multiple-patented, purpose-designed RBN702rs 7” pro-ribbon transducer and the acoustically and electronically symmetrical component configuration bring a unique pattern control in both the vertical as well as the horizontal plane, without any distortion-inducing horn constructions.
The patented constant 120-degree horizontal dispersion is maintained up to the highest frequencies.

The pro-ribbon’s power handling of 1500W and RMS-to-peak ratio of 1:15, caters for a superb intelligibility and throw with maximum dynamic headroom reserve.

The MF-section features a high-efficiency 6.5” midrange transducer with Neodymium motor-structure, coaxially mounted behind the HF driver in a horn-loaded configuration.

The LF section consist of 2 extended-excursion, reflex-loaded 8” woofers with oversized 3” voice-coil Neodymium motor-structure, surpassing the output of even larger drivers, while maintaining an unobtrusive face print.

The LR18/120 is driven by the Sentinel amplified loudspeaker controller, optimising the system’s response by LR18-specific drive processing and feedback for each array configuration, including presets for phase-matched low-frequency extensions.

The Signal Integrity Sensing™ pre-wiring ensures dynamic cable/connector compensation between the LR18 and ALC; This offers a 1:1, undistorted natural sound reproduction, regardless of cable length and amplifier impedance load (system damping factor 10.000).

The rigging system enables angle-setting on the cabinets without lifting the array, resulting in safer and faster set-up with minimal handling and a WLL of 24 cabinets under 10:1 safety.

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

Dimensional drawing

Technical specifications

Frequency response70 Hz - 20.000 Hz (+/- 3dB)
 51 Hz - (+/-10dB)
Sensitivity nominal105 dB (200 Hz – 10 kHz)
Nominal impedanceLF  8 ohms, MHF 8 ohms
Recommended driveSentinel10, max. 3 pcs. per channel (2.7 ohms)
Nominal SPL peak139 dB (Sentinel10 200 Hz - 10 kHz)
Dispersion H x V (array)120° x depending on array length
Dispersion H x V (single)120° x 10° (@ 10 kHz)

Physical specifications

System3-way, full-range
Filtering2-way active, 2-way passive
Drivers LF2x AW8.3ND-16 8”, vented
Drivers MF1x AM65ND-8 6.5”, vented
Drivers HF1x RBN702rs 7” pro-ribbon driver
Connectors2x Speakon NL8 input/link
Physical dimensions mm                 inches
Height226                    8,9
Width790                  31,1
Depth436                  17,2
Weight (approx.)28 kg               61,7 lb
Warranty6 years limited


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