The Bosch LBB1935/20 is a PLENA power amplifier that adds loudspeaker power to public address and voice alarm systems. Its priority switching lets important announcements take precedence over background music.

The Bosch LBB1938/30 is an EN 54-16-certified 480 W PLENA power amplifier for public address and voice alarm systems. It supports 70 V, 100 V, and 8 Ω loudspeaker loads, and its dual inputs with priority switching let announcements take precedence over background music.

The Bosch LBB1930/20 is a 120 W PLENA power amplifier for public address and voice alarm systems. It supports 70 V, 100 V and 8 Ω loudspeaker outputs and has two balanced line inputs with priority switching for announcements. Its dedicated 100 V input lets you add amplification to an existing loudspeaker line.