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L-Acoustics L Series helps transform Alpexpo’s “box in a box” venue vision into reality

When Alpexpo recognised that event organisers needed something between Grenoble’s massive arena and an intimate live venue, they decided to design a “box in a box” concept that carves out a 3389 square meter auditorium within their existing Greater Hall, powered by an L-Acoustics L Series professional sound system.

This architectural feat transforms what was once a traditional exhibition space into a chameleon-like venue that adapts seamlessly between intimate seated concerts for 1,495 people and energetic standing shows for 2,100. “They wanted to build a complete auditorium inside their existing hall”, says Antoine Maurel, Sales & Installation manager at L-Acoustics Certified Partner M+ Equipment, part of M Group. “Our challenge was creating an adaptable system that could be everything to everyone.”

The challenge went beyond mere logistics. For over five decades, Alpexpo - a venue with Olympic heritage dating to 1968 - has served as one of the Alps region’s premier event destinations. But evolving audience expectations and a growing demand for venues that could handle everything from stand-up comedy to hybrid and immersive multimedia experiences, the traditional approach no longer sufficed.

“With the existing attachment points, we needed to have a lightweight and efficient system adapted to the type of events, hence the L2”, says Maurel. The answer came through the weight-to-power ratio of the L Series meaning the team could deploy a full concert-grade line array system: two L2D arrays as the main system, complemented by three flown KS21 subwoofers per side in cardioid configuration. A centre cluster featuring A10 Wide and A10 Focus speakers ensures the desired coverage for the first audience rows.

“The L Series gave us something we couldn’t achieve before”, furthers Maurel. “Through advanced DSP processing, we can completely transform the acoustic environment. No manual intervention - just instant adaptation to whatever the event demands.”

The installation includes monitoring solutions with permanently hung A10 speakers and mobile X8 units, plus six additional X8 speakers for stage lip coverage when needed. Every element was modeled using Soundvision software. The entire project - from initial concept to opening night - was completed in just a few months, with M+ Equipment working alongside Alpexpo’s team to ensure the deadlines were met.

By creating a sophisticated performance space within an existing structure, the Alpexpo team has not only solved their own challenge but provided a blueprint for other venues facing similar constraints. “It’s not just a sound system; it’s a complete ecosystem that reflects our venue’s ability to adapt and excel”, says Jérôme Riff, Managing Director of Alpexpo. “We’ve created something truly unique for the Grenoble region - a space that can be whatever our community needs it to be.”

(Photos: Alpexpo/Princesse Photographie)

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