To Next PageTo Next Page
Need help?Do you have a question about the Bosch PRS?xPxxx and is the answer not in the manual?
Selectable 1, 2, 4, or 8 audio outputs (100/70/50 V).
Features audio processing, delay, and supervision for amplifier channels.
Local status display, VU-meter, and headphone monitoring capabilities.
Self-monitoring, network reporting, cabling options, and 48V DC backup input.
LCD display, rotary control, mains switch, and voltage selector.
Details mains, battery, network, mic/line, and loudspeaker output connections.
Covers control inputs/outputs, headphone, and spare amplifier connections.
Lists compliance with safety, immunity, emissions, and emergency standards.
Covers mains and battery supply voltage and power consumption details.
Specifies parameters for mic/line inputs and control interfaces.
Details performance metrics like frequency response, S/N, crosstalk, and distortion.
Provides load resistance, capacitance, and output power for various models.
Details physical dimensions, mounting, weight, and operating conditions.
Lists various power amplifier models with their configurations and order numbers.
Describes supervision control boards for line and loudspeaker monitoring.
Selectable 1, 2, 4, or 8 audio outputs (100/70/50 V).
Features audio processing, delay, and supervision for amplifier channels.
Local status display, VU-meter, and headphone monitoring capabilities.
Self-monitoring, network reporting, cabling options, and 48V DC backup input.
LCD display, rotary control, mains switch, and voltage selector.
Details mains, battery, network, mic/line, and loudspeaker output connections.
Covers control inputs/outputs, headphone, and spare amplifier connections.
Lists compliance with safety, immunity, emissions, and emergency standards.
Covers mains and battery supply voltage and power consumption details.
Specifies parameters for mic/line inputs and control interfaces.
Details performance metrics like frequency response, S/N, crosstalk, and distortion.
Provides load resistance, capacitance, and output power for various models.
Details physical dimensions, mounting, weight, and operating conditions.
Lists various power amplifier models with their configurations and order numbers.
Describes supervision control boards for line and loudspeaker monitoring.
The Bosch PRS-xPxxx and LBB 4428/00 Power Amplifiers are integral components of the Praesideo product range, designed to provide robust and flexible audio amplification within a network-connected system. These power amplifiers are available in various configurations, offering different numbers of amplifier channels per frame—specifically, one, two, four, or eight channels—while maintaining a consistent overall power rating of 500 watts across all models. This modularity allows for tailored solutions to meet diverse system requirements.
A key function of these power amplifiers is their ability to receive input signals directly over the network, ensuring seamless integration into a digital audio infrastructure. In addition to network inputs, they are equipped with auxiliary audio inputs for local audio sources, with two such inputs provided for most models and four for the LBB 4428/00. This dual input capability enhances flexibility, allowing for both centralized network control and localized audio injection.
The amplifiers offer versatile output options, configurable to 100 V, 70 V, or 50 V tappings, making them suitable for a wide range of loudspeaker setups. For enhanced system reliability and safety, they incorporate short-to-ground and short-circuit detection functions. Furthermore, the amplifiers can generate their own pilot tone, a crucial feature for continuous supervision of connected loudspeaker lines.
Maintenance and system integrity are paramount, and these power amplifiers are designed with comprehensive supervision capabilities. They are self-monitoring units that continuously report their status to the network controller, enabling proactive maintenance and rapid fault identification. The amplifiers support both single branch and redundant loop cabling configurations, offering flexibility in system design and ensuring continued operation even in the event of a cable fault. A significant maintenance feature is the integrated changeover facility for spare power amplifier switching, complete with included changeover relays. This allows for automatic or manual switching to a backup amplifier, minimizing downtime and ensuring uninterrupted audio service.
The control interface of the power amplifiers is user-friendly, featuring a 2 x 16-character LCD for status display and a rotary/push control button for local inquiries. This display can show VU-meter readings when the audio monitoring mode is active, providing immediate visual feedback on audio levels. For detailed audio monitoring, a headphone output is provided, allowing technicians to listen to the audio output directly from the unit.
Beyond basic amplification, these devices incorporate advanced digital audio processing capabilities. Each channel can be configured with three parametric equalization sections and two shelving equalization sections, offering precise control over the audio frequency response. Additionally, configurable audio delay can be applied to each channel, enabling sophisticated sound alignment and synchronization within complex audio environments.
The amplifiers are equipped with eight control inputs, which are freely programmable to trigger various system actions. These inputs can also have priorities assigned to them, ensuring that critical commands are executed promptly. A valuable maintenance feature of these control inputs is their ability to monitor the attached lines for open and short-circuits, providing early detection of wiring issues. In addition to inputs, the amplifiers provide control outputs—one per amplifier channel—which are freely programmable for fault indications or call-related actions, allowing for integration with other system components or external indicators.
For continuous operation, even during power outages, the amplifiers include a 48 V DC back-up supply input, ensuring that critical audio services remain active. The physical design includes a mains switch and a voltage selector for the PRS-xPxxx models, facilitating proper installation and operation.
In summary, the Bosch PRS-xPxxx and LBB 4428/00 Power Amplifiers are sophisticated, network-enabled audio amplification devices that combine flexible functionality with robust supervision and maintenance features. Their modular design, advanced audio processing, comprehensive fault detection, and backup power capabilities make them a reliable choice for demanding professional audio installations within the Praesideo system.
General| Frequency Response | 60 Hz to 20 kHz (+1/-3 dB) |
|---|---|
| THD at rated output power | <1 % |
| S/N (flat, max gain) | >75 dB |
| Signal-to-Noise Ratio | >75 dB |
| Line Input | 3 x Mic/Line, 2 x Music |
| Microphone Input | 3 x Mic/Line, 2 x Music |
| Music Input | 3 x Mic/Line, 2 x Music |
| Input Sensitivity | Mic: 0.7 mV (RMS); Line: 300 mV (RMS); Music: 300 mV (RMS) |
| Loudspeaker Outputs | 4 / 8 ohms, 70 V / 100 V |
| Power Supply | 230 VAC, ±10%, 50/60 Hz / 24 VDC |
| Dimensions (H x W x D) | 88 x 430 x 360 mm (3.5 x 16.9 x 14.2 in) |
| Dimensions | 88 x 430 x 360 mm (3.5 x 16.9 x 14.2 in) |
| Weight | 10.5 kg (23.1 lb) |
