Axys® by Duran Audio BV

ABF-260

The AXYS^® Asymmetric Boundary Flare (ABF) has been specially developed for use in road traffic tunnels to form part of the voice alarm and announcement systems. The technology involved has been patented.

The ABF geometry (essentially, half of a horn) is based on the principle of acoustical mirroring, in effect the mirroring creates the other half of the horn. The ABF is mounted on the ceiling which acts as a waveguide; reducing lateral reflections and obtaining a coherent wave front.

Installations include:

The Benelux tunnel, Rotterdam, The Netherlands
The Markusberg tunnel, Luxemburg
The Kil tunnel, near Rotterdam, The Netherlands
The Sijtwende, The Hague, The Netherlands
The IJ Tram tunnel, Amsterdam, The Netherlands
The Baldock Tunnel, Baldock, United Kingdom
The Blackwall Tunnel, London, United Kingdom
The Rotherhithe Tunnel, London, United Kingdom

The advantages of the ABF approach include:

Superior Speech Intelligibility
Minimum number of sources due to long throw
High Directivity
High Power
Low Distortion
Large front-to-back ratio
Superior sound quality to conventional folded horns, the ABF has a useful frequency response up to 8 kHz
Reduced installation and maintenance costs compared to conventional folded horns

Support

Development

Strategy