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    Renault Bass Reflex

    This week is dedicated to the innovation at Renault, a subject of major importance for the brand. Declic brings you two articles, each describing the birth of an innovation. Clio IV will ship with speakers hitherto reserved for executive vehicles. By optimizing the design principle and adapting an innovation from space technology, Renault has developed Renault Bass Reflex, a new audio system.

    Renault Bass Reflex

    Renault has developed a new revolutionary speaker system. These speakers feature a technology first developed by the space industry, with nozzles similar in shape to those found on rocket launchers. But what exactly is a nozzle? In aerospace technology, a nozzle is a conical duct positioned at the thrusters’ exit, and which transforms the thermal energy from the combustion gases into kinetic energy. In the case of an acoustic system, the objective is to recreate the sound quality of a home acoustic system by using the nozzles to reduce airflow at the speaker outlet, thus minimizing the turbulence that is detrimental to sound quality. Another non-negligible advantage in the case of an in-car system: with this nozzle, the speaker has a volume of 3 litres compared with 30 litres for a conventional speaker.

    The story behind this innovation goes back to the mid 2000s when Gaël Guyader, head of acoustic quality at Renault’s research division, set out to find a hifi system meeting the highest standards of quality for the acoustic team’s listening room at the research division.

    He explains:
    I needed speakers that could accurately reproduce the sound of a diesel engine, in particular to pick out its rhythm at low and even very low frequencies. More or less by chance, I met up with Jean-Pierre Morkerken, acoustics researcher at the CNRS (French national research centre) and space enthusiast. He had just invented the concept of acoustic nozzles.

    The Renault Bass Reflex system is a new take on a home bass reflex system. In the case of home speakers, the baffles in which low-frequency loudspeakers are enclosed comprise one or more holes referred to as vents. Jean-Pierre Morkerken’s idea was to replace this vent – a cylindrical hole of fixed diameter- by one or more nozzles shaped to resemble those of rocket engines. These nozzles limit the speed of the air flowing out of the tube and thus aerodynamic turbulence (vortices and other air swirls).
    Applied to speakers, this system improves bass performance and limits speaker volume. Gaël Guyader was convinced by this system and decided to apply the same principle to vehicle speakers. As well as improving sound, acoustic nozzles also save space, a valuable commodity in today’s cars.

    Towards industrial production

    The first advanced automotive loudspeakers applying the principle of acoustic nozzles were developed for demonstration purposes in 2007. The speakers were built into the doors with the nozzle end coming out through the cubby. The convincing results made the system a huge success in-house. This outcome was achieved through extensive integration studies, carried out first at the DREAM, and more particularly the DISA, on the best way to integrate the nozzle in the first prototypes.

    The vehicle engineering teams, from the DIAM, DIEC and DIESE in particular, then stepped in to make this innovative acoustic system a reality. Thanks to the tenacity and expertise of all the staff involved in the development process from A to Z, our customers will gain exceptional listening quality. In this way, an original idea that came about through the meeting of a space enthusiast and an acoustic scientist will soon be produced in tens of thousands of examples, for the benefit of all the drives who will enjoy this exceptional sound. Clio IV will be the first car in this segment to ship with bass reflex speakers, and the first in any category to feature speakers with nozzles!

    This is the meaning of innovation at Renault. Finding ideas that pave the way for new techniques, focused on customer needs and expectations. And first and foremost: making ingenious innovations available to the greatest number.

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