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BOSCH PRS 4P125 Presadio Controller



There are four types of Power Amplifier units in the Praesideo product range. These differ in the number of amplifier channels per frame: one, two, four, or eight. The overall power rating is 500 watts for all of the amplifiers. The Power Amplifiers can be set to 100 V, 70 V, and 50 V output tappings. They have short-to-ground and short-circuit detection functions, and can generate their own pilot tone for supervision purposes.


The Power Amplifiers receive input signals over the network. They also have two auxiliary audio inputs (four for LBB 4428/00) for local audio. Their eight control inputs are freely programmable for system actions, and priorities can be assigned to these inputs. Each control input has the ability to monitor the attached line for open and short circuits. Control outputs are freely programmable for faults and call-related actions. The 2 x 16-character display and the rotary control enable local status inquiries. The display shows the VU? meter reading, when the audio monitoring mode is active. Audio can be monitored by headphones.

The units are self-monitoring and continually report their status to the network controller. They support both single branch and redundant loop cabling. The amplifiers have a changeover facility for spare power amplifier switching. Changeover relays are included with the units. The amplifiers have a 48 V DC backup supply input. The digital audio processing can handle three parametric equalization sections and two shelving equalization sections per channel with configurable audio delay.

  • 1, 2, 4, or 8 audio outputs (selection from 100/70/50 V outputs)
  • Audio processing and delay for each amplifier channel
  • Amplifier supervision and spare amplifier switching
  • Loudspeaker line and loudspeaker supervision (LBB 4428/00 only line supervision)
  • Eight control inputs and 1, 2, 4, or 8 control outputs

BOSCH PRS 4P125 Presadio Controller Specs:

  • Connector: 9-pole header for removable screw connector
  • Connectors: Removable screw terminals
  • Connectors: Removable screw terminals
  • Storage Temperature : -20 to +70 ºC (-4 ºF to +158 ºF)
  • Control Inputs : 8 x
  • Relative Humidity: 15 to 90 %
  • Control Outputs: 1 x per amplifier channel
  • Operation: Closing contact (with supervision)
  • Main Power Consumption: 350/54/20 W
  • Product Weight: 35.49 lbs
  • Rated load resistance: 80 ohm (100 V); 40 ohm (70 V) 20 ohm (50 V)
  • Rated load capacitance : 62 nF (100 V); 125 nF (70 V) ) 250 nF (50 V)
  • Rated output power (per channel): 125 W (1 min. at 55 °C) 60 W (30 min. at 55 °C, cont. at 30 °C) 30 W (cont. at 55 °C)
  • Color: Charcoal with silver
  • Operating Temperature (Maximum): 131 F
  • Operating Temperature (Minimum): 23 F
  • Mounting Standalone: 19-inch rack
  • Air pressure 600 to 1100: hPa
  • Battery Power consumption: 332/39/10 W
  • Amplifier Type – Power Amplifier

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