Alcons has introduced its LFE18sl subwoofer, a slim-sized reference subwoofer system for demanding listening applications, delivering an accurate bass and sub response for “a maximum quality audible and sensible performance”. As part of the Cinema Reference Monitor System, the manufacturer has focused on obtaining a linear response in the operating bandwidth, while handling ultra-low-frequency transients with maximum control.

The 18-inch custom-designed woofer features a large motor structure with dual 3-inch voice coils offering a 30mm excursion, reportedly resulting in 10dB more excursion than a traditional (pro) 18-inch woofer. The direct-radiating transducer mounted in the sealed cabinet enables an in-room response below 10Hz. The driver is pre-wired for the Signal Integrity Sensing (SIS) compensating circuit to deliver an accurate reproduction for even the lowest octaves.

For full system performance, the CRMS-LFE18sl is to be driven and controlled by the ALC amplified loudspeaker controller, Alcons’ proprietary drive unit with system-dedicated processing and amplification. The SIS circuit onboard the Sentinel is said to ensure complete cable/connector compensation between the CRMS-LFE18sl and ALC, significantly increasing response accuracy and reducing both linear and non-linear distortion to an absolute minimum, regardless of (long) cable length and (low) system impedance. Therefore, with SIS, the 4Ω speaker impedance caters for maximum amplifier efficiency, with ample output from lower-rated Sentinels, without any compromise on performance.

The integrated factory presets in the drive processor of the ALC offer system optimisation settings, as well as proprietary VHIR processing for phase-matching with an Alcons pro-ribbon system. With a 27.5cm depth and M10 mounting points, the system can be stacked, flown, wall- or ceiling-mounted in even the smallest of spaces.

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