Bosch LA1-UM Column Loudspeaker

The LA1-UM Column Loudspeaker is a Bosch column array loudspeaker aimed at long, reverberant rooms where intelligibility matters. It belongs to Bosch's public address and voice alarm range. It is rated at 20 W / 40 W and Bosch quotes a 180 - 16000 Hz / 250 - 16000 Hz frequency response and 89 dB / 95 dB sensitivity.

It offers good speech intelligibility and background music reproduction, for applications where directivity is important, slim-line weatherproof design, swivel wall-mounting bracket supplied as standard and robust aluminum construction. It ships with wall mounting bracket and installation instruction. Pick the version you need from the options on this page; each one ships as its own Bosch part number.

Rated power (W)	20 W / 40 W
Rated input voltage (V)	100 V / 70 V; 100 V
Frequency range (-10 dB) (Hz)	180 - 16000 Hz / 250 - 16000 Hz
Sensitivity (1 W, 1 m, 1 kHz octave) (dB)	89 dB / 95 dB
Sensitivity (1 W, 4 m, 100 Hz - 10 kHz) (dB)	78 dB / 81 dB
Coverage angle HxV (-6 dB, 1 kHz) (°)	210 x 80 ° / 240 x 40 °
Coverage angle HxV (-6 dB, 4 kHz) (°)	94 x 22 ° / 92 x 12 °
IP rating	IP65