BOSCH PRS-2B250 Basic Amplifier, 2 X 250W

BOSCH PRS-2B250 Basic Amplifier, 2 X 250W

The basic amplifiers are made as a cost effective alternatives to the regular Praesideo power amplifiers, designed for situations where no built-in digital signal processing functions, such as equalizers, delay and AVC are required. They comes without a Praesideo network connection. Instead, these amplifiers are built connected to the Praesideo network with the use of the PRS-16MCI Multi Channel Interface, which is capable of providing the basic amplifier that comes along with audio signals and comes with full control. The basic amplifiers are made completely supervised and fault events are reported with the use of the multi channel interface to the Praesideo network controller. The basic amplifiers are for providing connections for separate group A and group B loudspeakers intended for each zone and support class-A loudspeaker loop wiring. The units should be mounted in a 19" rack that comes with the included mounting brackets.

Amplification
The PRS-2B250 is a professionally designed two-channel amplifier that comes along with 250 W per channel. The power supply is switched mode along with low inrush current and the units are possible to run on 48 V, battery stand-by power.

Connection
The amplifiers come along with a built-in output transformers designed for driving 70 and 100 V loudspeakers. They have separate overload-protected group A and group B loudspeaker connections, which are capable of supporting class-A loop wiring. The separate A and B groups of each channel are possible to be configured for redundancy. The units are made for connecting to the PRS-16MCI Multi Channel Interface for audio, control and supervision, but stand-alone operation is possible.

Audio
The amplifiers have analog audio line inputs intended for low priority local audio. Networked audio from the multi channel interface capable to override the local audio.

Security
The units are operating on both on mains power and on a 48 V battery power supply for emergency back up, along with automatic switchover. They supervise both of the power supplies, as well as themselves. They are made optionally monitor loudspeakers and their lines, during the time it is used together along with the PRS-16MCI Multi Channel Interface. Complete channel separation is made for allowing one channel of the amplifier to function as a spare amplifier for the other amplifier channel. The amplifier comes along with overload and short circuit protection. An overheat protection circuit switches off the power stage and is activating the fault LED on the front panel if the internal temperature reaches a critical limit.

Controls and indicators

Front
• Two two-color LEDs for mains and battery status
• Four amplifier status/level LEDs (per channel)

Back
• Mains on/off switch
• Mains voltage selector
• Rotary volume control for local audio inputs (per channel)

Inside
• 70 V / 100 V selection (per channel)

Interconnection

Back
• Mains socket
• Battery backup input
• Two loudspeaker output screw terminals (per channel)
• Spare amplifier input screw terminal (per channel)
• Two RJ45 connectors (per channel)
• Local audio input screw terminal (per channel)

Features

• High efficiency class-D amplifier channel(s)
• Switched mode power supply
• Local audio inputs
• Mains and battery operation
• Complete supervision