technical specifications LR28B
general•High-performance line-array LFE system forlarger applications•

Stackable and flyable with LR28 line-array or inseparate 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

description
The LR28B is the dedicated low-frequency extension to
the LR28 pro-ribbon line-array. It can also be combinedwith any other Alcons pro-ribbon system, in both
permanent and portable applications.
The front-loaded system delivers a super accuratebass and sub response with highest output under
lowest distortion, due to the super long-stroke 18”
woofers. This new-generation transducer is fitted with alarge, dual- 4.5” voice-coil Neodymium motor, enablinga significantly-extended excursion*, while maintaininga 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).

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 orbehind an LR28 (or any other) line-array.
Array configurations can be simulated through theLR28 GLL in the Alcons Ribbon Calculator (ARC),
Alcons’ high-resolution 3D simulation program.
Mobile (cardioid) stacks of up to 3 units can betransported through the PRRGLR28B pre-rig, including
stack-specific softcover.

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.
030919 • Due to Alcons Audio’s continuous R&D, all specifications are subject to change without prior notice.

evolutionary audio solutions™

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

The Signal Integrity Sensing™ pre-wiring ensurescomplete 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.

technical specifications LR28B
dimensional drawing

technical specifications
Frequency response

1198(+/- 3 dB)

29 Hz -		(+/- 10 dB)

Sensitivity nominal

103 dB (40 - 100 Hz)

Nominal impedance

4 ohmsRecommended drive

Sentinel10, max. 1 pce. per channel (4 ohms)

Nominal SPL peak660

34 Hz - 200 Hz

131 dB (Sentinel3 40 - 100 Hz)
137 dB (Sentinel10 40 - 100 Hz)

596

142 dB (comparative)
Dispersion H x Vomni / (hyper)cardioid in array with processing

physical specifications
System2x AW18.452ND-8 18”, ventedConnectors

3x Speakon NL4 input/link

Physical dimensions

mm		inches

Height

596		

23.4

Width1200		

47.2

Depth660		

26.0kg		lb

85		

187.4

Weight (approx.)

WarrantyA:

Alcons Audio
De Corantijn 69
1689 ANZWAAGThe Netherlands

E:
W:
T:
F:

info@alconsaudio.com
www.alconsaudio.com+31 (0)229 28 30 90+31 (0)229 28 30 99

030919 • Due to Alcons Audio’s continuous R&D, all specifications are subject to change without prior notice.

Subwoofer

Drivers LF

6 years limited

evolutionary audio solutions™