L-Acoustics L-ISA Concept Provides Immersive Sound Reinforcement For UrbanVoices

UrbanVoices, held in the French city of Nantes each July for the past six years and featuring a 1,000-member choir of Nantes singers, received enhanced sound reinforcement this time out from new L-ISA Live technology from L-Acoustics and its founder, Christian Heil.

UrbanVoices is a multifaceted project organized by the association of the Cité Monde [World City], which takes place over several months and is open to the entire city of Nantes.

Karim Ammour is artistic director and creator of the project, entitled The City is Beautiful, and also its composer and conductor. It is an eclectic program with compositions that range from reggae, soul, pop and gospel to rhythm and blues, with the 1,000 singers accompanied by a singer/guitarist, three beatboxers, a percussionist and a DJ.

With 40 singing rehearsals spread over eight weeks in 18 different locations, starting at the end of April, UrbanVoices is a musical adventure that culminated in the Grand Collective Urban Nantais, held in early July at the 2,000-seat Grand Auditorium of La Cité Des Congrès Nantes.

Klaus Blasquiz, a renowned musician noted for his band Magma and as musical director of UrbanVoices, had approached L-Acoustics with his wish to provide something different and more immersive for this year’s event.

“He visited our L-ISA auditorium in Paris together with Karim Ammour,” says Sherif el Barbari, head of application at L-ISA. “We introduced them both to the capabilities of our L-ISA Live concept, which immediately convinced them to be very suitable for what they wanted to achieve.”

Sherif and his team produced a design for an L-ISA Live setup for UrbanVoices consisting of five L-Acoustics Kara arrays of six elements each for the scene area, plus two 12XT per side for extended panoramic expansion.

This frontal system was complemented by two flown SB18 per side for low frequency extension and stacked SB28s on the stage floor for ultralow frequency content. Six 8XT speakers along the downstage edge handled front fill.

“The choir was divided into two groups of 500, alternating throughout the six performances over the weekend,” says Sherif. “The beatbox performers produced unbelievably low frequency content, which justified the use of large subwoofers to handle their signal.

“The massive choir provided the basis for a very wide immersive experience, which really benefitted from the L-ISA configuration,” he continues, “while the localization of Karim’s vocal and the instruments was maintained for every seat in the audience and with a clarity that is usually missed in a conventional left plus right (L + R) approach.”

“L-ISA Live connects the sound with the visual image of the artists performing on stage,” adds Mickaël Sourisseau, technical manager of La Cité des Congrés. “It allows every member of the audience optimum sound and consistency with what they are seeing, not just those in the seats located in the central axis of the scene. It was a great opportunity to deploy the L-Acoustics system—acquired two years ago during an upgrade to the Citè’s PA—in a new configuration that introduces the audience to a truly immersive experience.”

Find out more about L-ISA Live here.


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