Bosch Plena 480 Watt Power Amplifier

3 year factory warranty.

• 480 W power amplifier in a 3U high 19"housing
• 70 V / 100 V and 8 ohm outputs
• Dual inputs with priority switching
• 100 V input for slave operation on 100 V speaker line
• Temperature controlled forced front to back ventilation, directly stackable
• Mains, battery back-up, and pilot tone supervision
• EN 54-16 and EN 60849 compliant

Dependability

The amplifier is protected against overload and short circuits. A temperature-controlled fan ensures high reliability at high output levels and low acoustic noise at lower output levels. An overheat protection circuit switches off the power stage and activates an LED on the front panel, if the internal temperature reaches a critical limit due to poor ventilation or overload.

The unit operates both on mains power and on a 24 V battery power supply for emergency back up, with automatic switchover.

Input

The system has two balanced inputs with priority control, each with a loop-through facility. This makes it easy to connect remote systems that require priority control. An additional 100 V line input is provided to connect the amplifier to a 100 V loudspeaker line, to provide more power to remote locations.

Output

The amplifier has 70 V and 100 V outputs for constant voltage loudspeaker systems and a low impedance output for 8 ohm loudspeaker loads.

The LBB 1938-20 has two separate priority controlled 100 V outputs for zones that only need announcements made via the priority input, and for zones that will not get any announcements made via the priority input.