Gräf & Meyer "NEWS"

NEWS: Second generation of „ONE 500“ now available.
LDA ONE reinvents itself and becomes expandable

The system now offers up to 60 zones and a total output of up to 5000 W.

The ONE 500, the most compact and cost-effective public address and Voice Alarm System on the EN 54 market, continues to develop. It becomes ONE v2, a solution that can now be expanded thanks to a firmware update and the creation of a proprietary ring with standard UTP cabling (LOOP04 / LOOP10).

The entire scaled System-ONE, and thus each of the associated devices and their cascade function, corresponds to the EN 54-16 standard.

To set up a ONE v2 system with expansion, you only have to use a single expansion card per system and only add this to the master device to close the ring of UTP cabling.

In order to achieve maximum flexibility and adaptation to the needs of our national and international customers, this new functionality was made available as part of an extensive firmware update.

This was developed by our research and development department in Spain.

The new firmware of ONE v2 makes it possible to cascade several ONE500 devices via a proprietary UTP cable ring. This means that a total of up to 10 ONE devices can be connected together to form a 60-zone system with a total output of 5,000W. With immediate effect, all ONE devices delivered use the v2 firmware and the expandable functionality.

ONE v2 is therefore the ideal system for installations with multiple zones and for installations with variable performance. This is the case with office buildings, schools, medical centers and hotels; a scalable and modular solution is required there, that does not renounce any advanced functionality in terms of security and reliability.

Voice alarm systems



NEO stands for cutting-edge technology in EN 54-16 PA/VA applications and uses innovations that ensure the future and future viability.

The main unit by itself of NEO’s Public Address and Voice Alarm system, “NEO 8060”, impresses with its plug-and-play philosophy: in just one 2U device all is featured and included, for which other manufacturers normally require several devices...



ONE is a complete Plug-and-Play Audio Management System according to EN 54-16 / EN 54-4, in which Class D power amplifiers as well as a battery charger including battery are integrated in a single 2U enclosure.

The innovative Wall & Rack design allows mounting on a wall as well as in a rack, depending on the requirements of each project.

Gräf & Meyer GmbH

Who we are…
We have given ourselves the goal to develop needs-based Evacuation technology, which can optionally be combined with high-tech communication technology.

Life safety of people as well as individual communication with them, is our main focus in our daily business. This we achieve with our highly motivated, qualified and certified team for almost 25 years now.

What we offfer….
We offer the ideal solution for every application.


What we can do for you…
We think long term - that's why we offer a collaborative partnership that already starts before the project. Besides our professional advice, this also includes tailored planning & design support so you will end up with the right solution for your customer. Your success is our success.

What happens next?
Whether the chosen solution or advice was good, can only be judged "afterwards". Therefore, we are very proud that our customers highlight our services in their reviews as very positive over and over again; that’s exactly why this high quality of service is the key benefit of a medium-sized company.


Support for planning offices and system integrators

Rack assembly

according customers specification – on request


Commissioning service
on request

Phone support

…we are always at your

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More informationen:

Ringstraße 1
D-66459 Kirkel

Fon: +49 (0) 6841 / 934 93-0
Fax: +49 (0) 6841 / 934 93-10