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OPTIMUS S.A. is the leading Spanish company in the design, manufacture and distribution of public address (PA), voice alarm (VA) and intercom equipment.


The acoustics of tunnels require specialist solutions for evacuation and voice-alarm systems, both to ensure the intelligibility of the messages broadcast and to overcome the ambient noise and inherent confusion in these situations. The length of tunnels also requires the power stages to be distributed and linked via the network in order to synchronise the broadcasting of announcements and process audio signals with filters and delays.

Artxanda tunnels, Bilbao


FROM BILBAO’S CITY CENTRE TO THE AIRPORT. Bilbao (Spain). Each of the three tunnels that communicate the city of Bilbao with its airport is equipped with a central PA linked via data network to the system control. More than 150 exponential horn speakers (30 W) have been used and also acoustic projectors (20 W), in total, more than 150 loudspeakers deliver sound to more than 3 km, the total length of the tunnels.
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