The updated Network Controller is equipped with a more powerful processor for even faster system response within very large systems. It also includes a 48 V DC battery back-up input.
The Multi Channel Interface is connected to the Praesideo optical system bus and acts as the interface to the system's Basic Amplifiers. It enables supervision of the unit itself and of the connected Basic Amplifiers, and also controls spare amplifier switching. The Multi Channel Interface has a built-in controller for digital multiple line and loudspeaker supervision, embedded on the existing loudspeaker lines. It controls 16 audio channels / outputs, including redundant group A/B switching or class-A loop wiring for the Praesideo Basic Amplifiers. Furthermore, the Multi Channel Interface provides connections for 32 control inputs and 16 control outputs.
The new Basic Amplifiers are rated 2 x 250 W and 1 x 500 W. They are high efficiency class-D amplifiers with built-in output transformers to drive 100 V and 70 V loudspeakers. They offer an analogue audio line input for connection to the Multi Channel Interface as well as an additional analogue line input for low priority local audio. They provide overload protected connections for separate group A and group B redundant loudspeakers in a zone and can be configured for class-A loudspeaker loop wiring. The Basic Amplifiers feature a switch mode power supply with low inrush current and operate both on mains and 48 V battery power. Power supply and amplifiers are fully supervised. Stand-alone operation is possible. Later this year the range will be extended with 4 x 125 W and 8 x 60 W versions.
The Standard Praesideo Amplifiers remain in the product range for applications, which demand Digital Signal Processing functionality such as delay, equalizing or automatic volume control.
Praesideo Version 3.0 has been independently TÜV tested to EN/IEC60849 certification for "Sound Systems for Emergency Purposes". This means Bosch can assure not just installers but also fire departments, consultants/specifiers and end-users that the EVAC systems they are using comply with the strictest requirements of the EN60849 standard for public buildings.
Subjecting their products to this unique level of independent testing shows that Bosch Security Systems apply the strictest design criteria to provide PA and Emergency Voice Alarm systems that meet the highest industry standards for functionality, safety and quality, says the company.
(Chris Henry)
