LEN-20

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

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

nominal directivity (h x v) (-6 dB, average @ 1-4 kHz)

130° × 60°

directivity (h x v) (octave band) in acc. with EN-54-24 @ 500 Hz

360° × 360°

directivity (h x v) (octave band) in acc. with EN 54-24 @ 1000 Hz

190° × 120°

directivity (h x v) (octave band) in acc. with EN 54-24 @ 2000 Hz

120° × 60°

directivity (h x v) (octave band) in acc. with EN 54-24 @ 4000 Hz

95° × 30°

Loudspeaker features

Optional features

CAAD simulation data

power rating (nominal/program): according to IEC-60268-5 long term
power rating (peak); maximum SPL: peak, 20 ms with bandpass filtered pink noise signal according to IEC 60268-2 at one octave above the lower limit of the frequency range
sensitivity: 2,83 V at 8 ohms (2 V at 4 ohms, 4 V at 16 ohms) at a distance of 1 m under anechoic fullspace conditions
frequency range: -10 dB under anechoic halfspace-conditions
weight: net weight without optional equipment
Intelligent Protection Circuit (IPC): voltage-controlled semiconductor circuit protecting the HF-driver against overload highly effective and with very short attack time
cut-off frequency: -10 dB under anechoic halfspace-conditions with speaker preset
heat dissipation: pink noise, 6 dB crest, 1/4 Pmax