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Intelligent Power Distribution
Dynamically allocates up to 600 W of total output power across four channels, matching connected loudspeaker loads for efficient power utilization.
Flexible Amplification
IP-connected and fully-featured
PRAESENSA Public Address and Voice Alarm System
PRAESENSA system components
PRA-AD604 PRAESENSA 4-Channel Amplifier
600 W partitioned freely across four Class D channels, each with A/B outputs and DSP, plus an integrated spare channel for fail-safe redundancy.
- 600 W 4 Channels
- Spare Channel Built In
- EN 54-16 ISO 7240-16
IP-connected and fully-featured
PRAESENSA Public Address and Voice Alarm System
PRAESENSA system components
PRA-AD604 PRAESENSA 4-Channel Amplifier
600 W partitioned freely across four Class D channels, each with A/B outputs and DSP, plus an integrated spare channel for fail-safe redundancy.
- 600 W 4 Channels
- Spare Channel Built In
- EN 54-16 ISO 7240-16
PRA-AD604 · PRODUCT VIEWS
Explore the PRA-AD604 Inside & Out
Take a closer look at the Bosch PRA-AD604, from its front-panel status indicators to the rear interfaces supporting 48 V DC power, supervised loudspeaker outputs and OMNEO IP connectivity.
FRONT PANEL · 01 / 03
PRA-AD604 · PRODUCT VIEWS
Explore the PRA-AD604 Inside & Out
Take a closer look at the Bosch PRA-AD604, from its front-panel status indicators to the rear interfaces supporting 48 V DC power, supervised loudspeaker outputs and OMNEO IP connectivity.
FRONT PANEL · 01 / 03
PRA-AD604 · TECHNOLOGY IN ACTION
Powering Reliable Sound
Explore PRA-AD604 amplifier technology alongside videos explaining the wider Bosch PRAESENSA system.
01 / 05 · OMNEO IP networking
IP audio and control
The PRA-AD604 connects to a PRAESENSA network through its integrated OMNEO interface.
- Two Ethernet ports support RSTP and loop-through network connections.
- OMNEO carries digital audio and control data; the amplifier supports Dante and AES67 compatibility.
- Network-link supervision supports fault reporting through the system controller.
02 / 05 · Intelligent power utilization
600 W shared power budget
Four amplifier channels share a total maximum loudspeaker output budget of 600 W.
- Available output power is distributed across the four channels according to connected loudspeaker loads.
- Transformerless, galvanically isolated 70 V / 100 V outputs support flexible loudspeaker installations.
- Efficient Class-D amplifier architecture helps limit heat loss and energy consumption.
03 / 05 · Automatic fail-safe redundancy
Built-in spare channel
An independent spare amplifier channel supports automatic failover if one of the main channels fails.
- The spare channel can automatically replace a failed channel while retaining its audio-processing settings.
- Dual 48 V DC power inputs each have a DC/DC converter for power-input redundancy.
- A backup analog lifeline input supports emergency audio when the network interface or both network connections fail.
04 / 05 · Supervised loudspeaker lines
Protected A/B outputs
Every PRA-AD604 amplifier channel supports two separately supervised loudspeaker outputs.
- Independent A and B loudspeaker outputs allow redundant wiring topologies.
- Loudspeaker-line integrity can be supervised using separately available end-of-line devices.
- Class-A loudspeaker-loop wiring is supported between each channel’s A and B outputs.
05 / 05 · Per-channel audio processing
DSP for every zone
Digital signal processing is available on each of the four amplifier channels.
- Each channel supports equalization, audio delay and limiting for zone-specific tuning.
- Individual sound processing helps tailor speech intelligibility to the connected loudspeaker zone.
- The amplifier is designed for Bosch PRAESENSA public address and voice alarm applications.
PRA-AD604 · TECHNOLOGY IN ACTION
Powering Reliable Sound
Explore PRA-AD604 amplifier technology alongside videos explaining the wider Bosch PRAESENSA system.
01 / 05 · OMNEO IP networking
IP audio and control
The PRA-AD604 connects to a PRAESENSA network through its integrated OMNEO interface.
- Two Ethernet ports support RSTP and loop-through network connections.
- OMNEO carries digital audio and control data; the amplifier supports Dante and AES67 compatibility.
- Network-link supervision supports fault reporting through the system controller.
02 / 05 · Intelligent power utilization
600 W shared power budget
Four amplifier channels share a total maximum loudspeaker output budget of 600 W.
- Available output power is distributed across the four channels according to connected loudspeaker loads.
- Transformerless, galvanically isolated 70 V / 100 V outputs support flexible loudspeaker installations.
- Efficient Class-D amplifier architecture helps limit heat loss and energy consumption.
03 / 05 · Automatic fail-safe redundancy
Built-in spare channel
An independent spare amplifier channel supports automatic failover if one of the main channels fails.
- The spare channel can automatically replace a failed channel while retaining its audio-processing settings.
- Dual 48 V DC power inputs each have a DC/DC converter for power-input redundancy.
- A backup analog lifeline input supports emergency audio when the network interface or both network connections fail.
04 / 05 · Supervised loudspeaker lines
Protected A/B outputs
Every PRA-AD604 amplifier channel supports two separately supervised loudspeaker outputs.
- Independent A and B loudspeaker outputs allow redundant wiring topologies.
- Loudspeaker-line integrity can be supervised using separately available end-of-line devices.
- Class-A loudspeaker-loop wiring is supported between each channel’s A and B outputs.
05 / 05 · Per-channel audio processing
DSP for every zone
Digital signal processing is available on each of the four amplifier channels.
- Each channel supports equalization, audio delay and limiting for zone-specific tuning.
- Individual sound processing helps tailor speech intelligibility to the connected loudspeaker zone.
- The amplifier is designed for Bosch PRAESENSA public address and voice alarm applications.
PRAESENSA · APPLICATION AREAS
Engineered for real-world environments
Explore how the Bosch PRA-AD604 supports supervised, networked amplification as part of a configured PRAESENSA public address and voice alarm system.
Campus application areas
Lecture hallsAcademic buildingsShared spacesCampus areas
Hospitality application areas
LobbiesRestaurantsConference areasGuest corridors
Retail application areas
Retail areasFood courtsAtriumsPublic areas
Infrastructure application areas
Passenger areasIndustrial buildingsOperational areasSafety communication
01 / 04 · APPLICATION
Universities & Campuses
Reliable announcements and voice alarm communication across academic buildings, lecture halls and campus areas.
Relevant applications
- Multi-zone public announcements
- Supervised voice alarm distribution
- Flexible coverage across campus buildings
PRA-AD604 contributionNetworked 70/100 V loudspeaker amplification with per-channel DSP and supervised outputs as part of PRAESENSA.
02 / 04 · APPLICATION
Hotels & Hospitality
Flexible audio amplification for background music, guest announcements and voice alarm systems across hospitality facilities.
Relevant applications
- Background music across selected areas
- Guest information and announcements
- Voice alarm coverage across hotel zones
PRA-AD604 contributionFlexible power allocation across four amplifier channels and A/B supervised loudspeaker outputs.
03 / 04 · APPLICATION
Shopping Malls & Retail
Adaptable audio distribution for retail zones, promotional announcements and emergency voice messages.
Relevant applications
- Zoned background music
- Promotional and customer announcements
- Public safety voice messaging
PRA-AD604 contributionUp to 600 W total output power shared flexibly across four channels, with individual DSP processing.
04 / 04 · APPLICATION
Transportation & Industrial
Supervised audio amplification for passenger information and safety communications in large transport and industrial facilities.
Relevant applications
- Passenger information announcements
- Multi-area safety messaging
- Scalable, network-based audio distribution
PRA-AD604 contributionDual OMNEO network ports, redundant 48 V DC power inputs and automatic spare-channel substitution.
PRAESENSA · APPLICATION AREAS
Engineered for real-world environments
Explore how the Bosch PRA-AD604 supports supervised, networked amplification as part of a configured PRAESENSA public address and voice alarm system.
Campus application areas
Lecture hallsAcademic buildingsShared spacesCampus areas
Hospitality application areas
LobbiesRestaurantsConference areasGuest corridors
Retail application areas
Retail areasFood courtsAtriumsPublic areas
Infrastructure application areas
Passenger areasIndustrial buildingsOperational areasSafety communication
01 / 04 · APPLICATION
Universities & Campuses
Reliable announcements and voice alarm communication across academic buildings, lecture halls and campus areas.
Relevant applications
- Multi-zone public announcements
- Supervised voice alarm distribution
- Flexible coverage across campus buildings
PRA-AD604 contributionNetworked 70/100 V loudspeaker amplification with per-channel DSP and supervised outputs as part of PRAESENSA.
02 / 04 · APPLICATION
Hotels & Hospitality
Flexible audio amplification for background music, guest announcements and voice alarm systems across hospitality facilities.
Relevant applications
- Background music across selected areas
- Guest information and announcements
- Voice alarm coverage across hotel zones
PRA-AD604 contributionFlexible power allocation across four amplifier channels and A/B supervised loudspeaker outputs.
03 / 04 · APPLICATION
Shopping Malls & Retail
Adaptable audio distribution for retail zones, promotional announcements and emergency voice messages.
Relevant applications
- Zoned background music
- Promotional and customer announcements
- Public safety voice messaging
PRA-AD604 contributionUp to 600 W total output power shared flexibly across four channels, with individual DSP processing.
04 / 04 · APPLICATION
Transportation & Industrial
Supervised audio amplification for passenger information and safety communications in large transport and industrial facilities.
Relevant applications
- Passenger information announcements
- Multi-area safety messaging
- Scalable, network-based audio distribution
PRA-AD604 contributionDual OMNEO network ports, redundant 48 V DC power inputs and automatic spare-channel substitution.
Key specs
- 600 W flexible power across 4 channels
- 70 V / 100 V supervised A/B outputs
- Integrated spare amplifier channel
- Individual DSP for all 4 channels
- Dual 48 V DC power inputs
- OMNEO IP audio with dual Ethernet ports
- EN 54-16 / ISO 7240-16 certified
- 1U 19-inch rack-mount design
Bosch PRA-AD604 Technical Specifications
Explore the detailed technical specifications of the Bosch PRA-AD604 PRAESENSA 600 W, 4-channel amplifier, including flexible output power distribution, digital signal processing, redundant power and audio networking, loudspeaker supervision, and mechanical and environmental characteristics.
Category | Specification | Details |
Amplifier | Amplifier Channels | 4 independent channels + 1 integrated spare channel |
| Combined Maximum Output Power | 600 W | |
| Combined RMS Power (specified EIAJ test) | 150 W | |
| Nominal Loudspeaker Output | 70 V RMS / 100 V RMS | |
| Loudspeaker Load (all channels, maximum) | 600 W | |
| Minimum Load Impedance — 100 V | 16.7 Ω | |
| Minimum Load Impedance — 70 V | 8.3 Ω | |
| Maximum Cable Capacitance | 200 nF | |
Digital Signal Processing | Per-Channel Master Equalizer | 7-band |
| Level Control | 0 dB to −60 dB; mute | |
| Level Control Resolution | 1 dB | |
| Audio Delay | 0–60 s | |
| Audio Delay Resolution | 1 ms | |
| Limiter | RMS power limiter | |
Audio Performance | Frequency Response (−3 dB) | 20 Hz–20,000 Hz |
| THD + Noise (at RMS power) | < 0.50% | |
| THD + Noise (6 dB below RMS power) | < 0.1% | |
| Intermodulation Distortion | < 0.10% | |
| Minimum SNR — 100 V mode | 110 dBA | |
| Minimum SNR — 70 V mode | 107 dBA | |
| Channel Crosstalk | < −84 dBA | |
| Audio Sample Rate | 48 kHz | |
| Audio Sample Size | 24-bit | |
Electrical | Nominal Power Supply Input | 48 V DC |
| Permitted Input Voltage | 44–60 V DC | |
| Power Supply Inputs | Dual inputs A/B | |
| Sleep Mode Consumption (no supervision) | 6 W | |
| Snooze Mode Consumption (supervision active) | 7.5 W | |
| Active Idle Consumption | 36 W | |
| Active Low-Power Consumption | 50 W | |
| Active RMS-Power Consumption | 222 W | |
| Consumption per Active Network Port | 0.4 W | |
Network & Security | Number of Ethernet Ports | 2 |
| Ethernet Types | 100BASE-TX; 1000BASE-T | |
| Ethernet Protocol | TCP/IP | |
| Control/Audio Protocol | OMNEO | |
| Network Redundancy | RSTP | |
| Network Audio Latency | 10 ms | |
| Audio Encryption | AES-128 | |
| Security | TLS | |
Supervision & Redundancy | Spare Channel | Integrated automatic amplifier-channel redundancy |
| Loudspeaker Output Redundancy | A/B groups; Class-A loop support | |
| End-of-Line Detection | 25.5 kHz pilot tone; 3 V RMS | |
| Network Interface Supervision | Link presence | |
| Amplifier Load Supervision | Short circuit | |
| DC Input Supervision | Undervoltage | |
| Thermal Supervision | Overheat | |
| Controller Continuity | Watchdog | |
Environmental | Operating Temperature | −5 °C to +50 °C |
| Storage Temperature | −30 °C to +70 °C | |
| Relative Humidity | 5–95% (non-condensing) | |
| Air Pressure | 560–1,070 hPa | |
| Installation Altitude | −500 m to +5,000 m | |
| Fan Airflow | Front to sides/rear | |
| Fan Noise — Idle (1 m) | < 30 dB SPL(A) | |
| Fan Noise — RMS Power (1 m) | < 53 dB SPL(A) | |
Mechanical | Dimensions (H × W × D) | 44 × 483 × 400 mm |
| Rack Height | 1U | |
| Ingress Protection | IP30 | |
| Housing Material | Steel; Zamac | |
| Color | RAL 9017 Traffic black | |
| Weight | 8.10 kg | |
Reliability | MTBF (calculated extrapolation) | 300,000 h |
Questions & answers
Know before you buy
Quick answers about the PRA-AD604, and how it compares.
What is the Bosch PRA-AD604 used for?
The Bosch PRA-AD604 is a 600 W, 4-channel power amplifier for the PRAESENSA IP-based Public Address and Voice Alarm System. It distributes audio to 70 V or 100 V loudspeaker circuits for announcements, background music and voice alarm applications.
Which system is compatible with the Bosch PRA-AD604?
The PRA-AD604 is designed specifically for Bosch PRAESENSA systems. It uses OMNEO IP networking for audio and control and integrates with compatible PRAESENSA system controllers and power infrastructure.
Does the PRA-AD604 deliver 600 W on each channel?
No. Its maximum combined output power is 600 W, flexibly distributed across four amplifier channels according to the connected loudspeaker loads. The 600 W rating is not per channel.
How does the PRA-AD604 maintain operation if an amplifier channel fails?
It has an integrated independent spare amplifier channel that automatically replaces a failed channel. It also supports supervised A/B loudspeaker outputs and redundant power and network connections.
What network connections and audio processing does the PRA-AD604 support?
It provides two Ethernet ports for OMNEO digital audio and control, with RSTP network redundancy. Each amplifier channel includes DSP functions such as equalization, level control, limiting and delay.
What are the mounting requirements and certifications of the PRA-AD604?
The PRA-AD604 is a 1U, 19-inch rack-mount amplifier. The manufacturer lists EN 54-16 and ISO 7240-16 certification for voice alarm applications. Installation should be performed by trained professionals.
Who is the official distributor of the Bosch PRA-AD604 in Pakistan?
ESCO (Electronic Security Company) is an authorized national distributor of Bosch products in Pakistan, supplying the Bosch PRA-AD604 PRAESENSA amplifier with genuine products, warranty support and nationwide after-sales service. Contact ESCO Pakistan for the latest price, availability and project quotations.