There are four types of power amplifier units in the Praesideo product range. These differ in the number of amplifier channels per frame and the power ratings of the individual amplifier channels.
The types of power amplifiers are as follows:
The power amplifiers can be selected for 100 V, 70 V and 50 V output tapping. Audio input is provided via the fiber optic network cable. The power amplifiers are equipped with amplifier monitoring and change-over relays. The amplifier provides short-to-ground and short-circuit detection functions. If an end-of-line supervision card is plugged in, the loudspeaker lines are also monitored for open circuits. The pilot tone for the monitoring is generated in the power amplifier itself. The power amplifiers are equipped with audio processing facilities for each amplifier channel. It is possible to have 3 parametric equalizer sections and 2 shelving equalizers. The power amplifiers can be connected to the network line directly. Ambient microphone connection enables output level adjustment for maximum intelligibility. The power amplifier has a provision for connecting a 48 V DC backup power supply. The 48 V is protected against reverse polarity, and availability of the 48 V supply is continuously monitored.
- LBB 4421/10 1 x 500 W Power Amplifier
- LBB 4422/10 2 x 250 W Power Amplifier
- LBB 4424/10 4 x 125 W Power Amplifier
- LBB 4428/00 8 x 60 W Power Amplifie