Voice Alarm

LEN-20

The LEN-20 is a passive 100 volt speaker certified according to EN 54-24 Type B for use in voice alarm systems. Like all products in the Voice Alarm series, it is equipped with a weatherproof, steel-reinforced aluminum housing, making it equally suitable for indoor and outdoor use. The LEN loudspeakers guarantee excellent speech intelligibility and high ranges even in difficult acoustics environments.

Main features

  • 2 × coated 4" chassis
  • Uniform directivity
  • Suppression of unwanted side lobes thanks to Fohhn Source Division Waveguide
  • Weatherproof without additional protection (degree of protection IP54 according to IEC 529 / EN 60529)
  • 8 × M6 thread for safe installation
  • Available in different colors (RAL Classic, Pantone, NCS) or with Fohhn Texture Design
  • In order to ensure performance and operational safety, Fohhn system amplifiers including the correct speaker preset are required.

Colours

Fohhn technologies

Technical data

Electroacoustic features

acoustic design
weatherproof passive line source speaker system, closed, suppression of side lobes by Source Division Waveguides
components
2 × 4" drivers with treated cones
sensitivity 1 W @ 4 m in accordance with EN 54-24
79 dB SPL
SPLmax 100 V @ 4 m in accordance with EN 54-24 (trafo S/M/L)
92 dB SPL
transformer options, power handling in acc. with EN 54-24 100 V (trafo S/M/L)
50 W / - / -
transformer options, power handling in acc. with EN 54-24 70 V (trafo S/M/L)
24.5 W / - / -
impedance 100 % tap (trafo S/L/M)
200 ohm / - / -
impedance 50 % tap (trafo S/M/L)
400 ohm / - / -
impedance 25 % tap (trafo S/M/L)
800 ohm / - / -
2-way design
no
nominal directivity (h × v) (-6 dB, average @ 1-4 kHz)
130° × 60°
directivity (h × v) (octave band) in acc. with EN-54-24 @ 500 Hz
360° × 360°
directivity (h × v) (octave band) in acc. with EN 54-24 @ 1000 Hz
190° × 120°
directivity (h × v) (octave band) in acc. with EN 54-24 @ 2000 Hz
120° × 60°
directivity (h × v) (octave band) in acc. with EN 54-24 @ 4000 Hz
95° × 30°

Features

enclosure
weatherproof aluminium housing, powder coated, steel bracings
front design
ball impact resistant grille, galvanized and powder coated in housing colour backed by acoustically transparent foam
weight (trafo S/M/L)
approx. 3 kg / - / -
standard colours
black (RAL 9005) or white (RAL 9016), powder-coated
mounting points
4 × M6 screw threads
certificates
EN 54-24 type B
EN 54-24
1
connectors
terminal connectors capable of receiving up to 4 mm², two per pin, terminal cover with dual cable gland for up to 10 mm cable diameter
dimensions (W × H × D)
approx. 130 × 230 × 120 mm

Optional features

optional colours
RAL Classic / NCS / Pantone on request, Fohhn Texture Design
optional weather protection
as standard (protection class IP54, in accordance with IEC 529 / EN 90529)
optional connectors
ceramic terminals capable of receiving up to 2.5 mm²

CAAD simulation data

simulation data
EASE, CLF, Ulysses, Fohhn Designer

weight: net weight without optional equipment
sensitivity 1 W / SPLmax 100 V @ 4 m in accordance with EN 54-24: measured in the far field of the speaker, count back to 4 m distance
impedance 100 / 50 / 25 % tap: measured at a voltage producing 1 W per speaker system

Contact us

+49 7022 93323-0

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