Communications Systems | PRA-AD608 Amplifier, 600W 8-channel PRA-AD608 Amplifier, 600W 8-channel www.boschsecurity.com u Flexible power partitioning across all channels u Low power consumption and heat loss u Full supervision with integrated fail‑safe redundancy u Digital signal processing per channel u IP‑networked on OMNEO for audio and control This is a flexible and compact multi‑channel power • Cost and space saving, integrated, independent spare amplifier for 100 V or 70 V loudspeaker systems in channel for fail‑safe redundancy. Public Address and Voice Alarm applications. It fits in • High‑efficiency in all operating conditions; dissipation centralized system topologies, but also supports and heat loss is minimized to save on energy and decentralized system topologies because of its battery capacity for backup power. OMNEO IP‑network connection, combined with Flexibility in loudspeaker topologies DC‑power from a multifunction power supply. • A/B outputs on every amplifier channel to support The output power of each amplifier channel adapts to redundant loudspeaker wiring topologies. Both the connected loudspeaker load, only limited by the outputs are individually supervised and disabled in total power budget of the whole amplifier. This case of a fault. flexibility, and the integration of a spare amplifier • Class A loop wiring possible between the A and B channel, makes it possible to utilize the available loudspeaker outputs. power effectively and use less amplifiers for the same • Load independent frequency response; the amplifier loudspeaker load, compared to using traditional channels can be used with any loudspeaker load up amplifiers. to the maximum, without any change in audio quality. Digital sound processing and control, adjusted to the Sound quality acoustics and requirements of each zone, allow for • Audio‑over‑IP, using OMNEO, the Bosch high‑quality better sound quality and speech intelligibility. digital audio interface, compatible with Dante and AES67; audio sample rate is 48 kHz with 24‑bit Functions sample size. • Large signal to noise ratio, wide audio bandwidth and Efficient 8‑channel power amplifier very low distortion and crosstalk. • Transformerless, galvanically isolated, 70/100 V • Digital signal processing on all amplifier channels, outputs, with a total loudspeaker output power of including equalization, limiting and delay, to optimize 600 W. and tailor the sound in each loudspeaker zone. • Flexible partitioning of the available output power across all amplifier channels to use it effectively, significantly reducing the amount of required amplifier power in a system. 2 | PRA-AD608 Amplifier, 600W 8-channel Supervision Connection and functional diagram • Supervision of amplifier operation and all of its connections; faults are reported to the system controller and logged. 1 A 1 • Loudspeaker line integrity supervision without A 1 B interruption of audio, using end‑of‑line devices (separately available) for best reliability. • Network link supervision. 2 A 2 2 B Fault tolerance • Dual OMNEO network connections, supporting Rapid B Spanning Tree Protocol (RSTP), for loop-through 3 A connections to adjacent devices. 3 3 B • Dual 48 VDC inputs with polarity reversal protection, each with a full power DC/DC converter, operating in tandem for redundancy. 4 A 4 • Fully independent amplifier channels; the integrated 4 B spare channel automatically replaces a failing channel, with due regard of the actual sound 5 A processing settings. 5 • All amplifier channels support two independent 5 B loudspeaker groups, A and B, enabling redundant 1 loudspeaker wiring topologies. 6 A • Backup analog audio lifeline input driving the spare 6 amplifier channel to serve all connected loudspeaker 2 6 B zones in case both network connections, or the amplifier network interface, would fail. 7 A 7 7 B 8 A 8 8 B DC to DC converter Audio processing (DSP) OMNEO network switch Controller Lifeline control interface Lifeline supply input Lifeline audio input 1‑8 Amplifier channel Spare channel 3 | PRA-AD608 Amplifier, 600W 8-channel Front view 1 Network port 1‑2 Front panel indicators Safety ground Spare channel substitute 1‑8 White Signal present 1‑8 Green Architects’ and engineers’ specifications Fault present 1‑8 Yellow The IP‑networked 8‑channel amplifier shall be designed exclusively for use with Bosch PRAESENSA Ground fault present Yellow systems. The amplifier shall adapt the maximum output power of each amplifier channel to its Device fault present Yellow connected loudspeaker load, with free assignable output power per channel for a total maximum of Audio lifeline substitute White 600 watt per amplifier, supporting 70 V or 100 V operation with direct drive capability and outputs that are galvanically insulated from ground. The amplifier Network link to system controller present Green Network link lost Yellow shall have a built‑in independent spare amplifier Amplifier in standby mode Blue channel for automatic failover. The amplifier shall provide an interface for control data and multi-channel Power on Green digital audio over OMNEO using dual Ethernet ports for redundant network connection, supporting RSTP Rear view and loop‑through cabling, with automatic failover to an analog lifeline input. The amplifier shall have dual power supply inputs and power supplies. All amplifier channels shall have independent A/B zone outputs with support for class-A loudspeaker loops. All Rear panel indicators amplifier channels shall supervise the integrity of connected loudspeaker lines without interruption of 100 Mbps network Yellow 1 Gbps network Green audio distribution. The amplifier shall provide front‑panel LED status indications for the network link, Power on Green ground fault, power supplies and audio channels, and Device in identification mode Green provide additional software monitoring and fault blinking reporting features. The amplifier shall be rack mountable (1U) and feature software‑configurable Device fault present Yellow signal processing including level control, parametric equalization, limiting and delay for each channel. The Rear panel controls amplifier shall be certified for EN 54-16 / ISO 7240-16, marked for CE and be compliant with the RoHS Device reset (to factory default) Button directive. Warranty shall be three years minimum. The amplifier shall be a Bosch PRA-AD608. Rear panel connections Certifications and approvals 48 VDC input A‑B Emergency standard certifications 48 V Europe EN 54‑16 Lifeline interface International ISO 7240‑16 Regulatory areas Loudspeaker output A‑B (1‑8) Safety EN/IEC/CSA/UL 62368‑1 Immunity EN 55024 EN 55103‑2 (E1, E2, E3) EN 50130‑4 4 | PRA-AD608 Amplifier, 600W 8-channel Regulatory areas PRA-AD608 Amplifier, 600W 8-channel Emissions EN 55032 EN 61000‑6‑3 Frequency response (Hz) 20 - 20000 Hz ICES‑003 Minimum signal-to-noise ratio (dBA) 107 dBA ANSI C63.4 FCC‑47 part 15B class A Pilot tone frequency (kHz) 25,50 kHz Environment EN 50581 Pilot tone level (V) 3 V Railway applications EN 50121‑4 Protection Overheat;Overload;RM S output power Maritime applications DNV‑GL Type Approval limiter;Ground fault;Watchdog;DC Conformity declarations output;RSTP;Spare Europe CE/CPR channel;Lifeline Australia RCM Degree of protection (IEC 60529) IP30 Morocco CMIM Operating temperature (°C) -5 - 50°C Russian Federation EAC Dimension (H x W x D mm) 44 x 483 x 400 mm United Arabic CoC Weight (kg) 8,80 kg Emirates Electrical Parts included Loudspeaker load Quantity Component Maximum loudspeaker load 100 V mode, all channels* 600 W 1 Amplifier, 600W 8‑channel 70 V mode, all channels* 600 W 1 Set of 19"‑rack mounting brackets (pre‑mounted) Minimum loudspeaker load impedance 100 V mode, all channels* 16.7 ohm 1 Set of screw connectors and cables 70 V mode, all channels* 8.3 ohm 1 Quick Installation Guide Maximum cable capacitance 1 Safety information 100 V mode, all channels* 2 uF 70 V mode, all channels* 2 uF Technical specifications *All channels combined. Quick overview Amplifier outputs PRA-AD608 Amplifier, 600W 8-channel Rated output voltage 100 V mode, 1 kHz, THD <1 %, no load 100 VRMS Operating voltage (VDC) 44 - 60 VDC 70 V mode, 1 kHz, THD <1 %, no load 70 VRMS Power consumption (W) 250 W maximum Burst / rated power** Number of outputs 8 All channels combined 100 V mode, load 16.7 ohm 600 W / 150 W Maximum output power (W) 600 W burst 70 V mode, load 8.3 ohm 600 W / 150 W Channel 1 Number of analog inputs 1 100 V mode, load 16.7 ohm // 20 nF 600 W / 150 W Number of Ethernet ports 2 70 V mode, load 11.7 ohm // 20 nF 420 W / 105 W Other channels 100 V mode, load 33.3 ohm // 20 nF 300 W / 75 W 70 V mode, load 16.7 ohm // 20 nF 300 W / 75 W Protocols and interfaces OMNEO;AES 70 Full to no load regulation Sample rate (kHz) 48 kHz 20 Hz to 20 kHz < 0.2 dB Signal processing Equalization;Limiter;Del Frequency response ay;Level Rated power, +0.5 / -3 dB 20 Hz to 20 kHz Rated output voltage (V) 70;100 V 5 | PRA-AD608 Amplifier, 600W 8-channel Amplifier outputs Supervision Total Harmonic Distortion + Noise (THD+N) Loudspeaker line redundancy switching A/B group, Class‑A loop Rated power, 20 Hz to 20 kHz < 0.5 % 6 dB below rated power, 20 Hz to 20 kHz < 0.1 % Controller continuity Watchdog Intermodulation Distortion (ID) Temperature Overheat 6 dB below rated power, 19+20 kHz, 1:1 < 0.1 % Fan Rotation speed Signal to Noise Ratio (SNR) Network interface Link presence 100 V mode, 20 Hz to 20 kHz > 110 dBA typical 70 V mode, 20 Hz to 20 kHz > 107 dBA typical Network interface Crosstalk between channels