Axente, a well-respected professional audio distributor in France, and integration specialists Groupe SNEF and Axians worked together to design the distributed sound reinforcement system that provides fans with an enhanced game day experience. They teamed up with the design office of Atelier Audiovisuel, the engineering consulting firm brought in by Vinci Construction, to ensure that all of the stadium audio needs were met.
The eight-channel Ottocanali amplifiers provide 144 independently configurable channels to drive the QX loudspeakers. Because each compact 2RU device can deliver up to 8,000W of Class D power across eight channels into a 4-ohm load, the stadium will also benefit from lower operating costs as well as higher power density and less demanding conditioning.
Ultimately, four Ottocanali 4K4 and 14 Ottocanali 12K4 power a distributed system made up of 20 QX loudspeakers clusters mounted 35 metres (115ft) high under the gangway. Custom hanging hardware designed by SNEF was utilised to mount the loudspeakers. The majority of the system is comprised of 16 clusters made up of two QX596i and one QX564i, bi-amped, with the QX596i shooting down to cover the first and second tiers of seating while the QX564i covers the upper tier. The four corner clusters consist of one QX596i and one QX564i positioned to cover the corner seating areas.
The three-way, point source QX596i and QX564i loudspeakers load ultra-efficient mid-high compression drivers (90 x 45 and 60 x 45 respectively) with a constant directivity horn. Four Phase Aligned 12-inch low frequency transducers arranged as vertical and horizontal pairs leverage beneficial interaction based on their spacing to extend pattern control will into the low frequency range.
"The four 12-inch LF cones were exactly what we needed to achieve excellent low end without compromising intelligibility," adds Frankie Celeste from Axians.
It was Axente's consultant Alain Hercman who recommended the Powersoft/EAW system. "The quality of this amplifier platform is far superior to others and allows us to use fewer amplifiers," he explains. "When combined with the state-of-the-art QX Series - which provide tremendous output and intelligibility - it was a win-win situation."
Rodolphe Roellinger, head of audiovisual at SNEF, stated that the Ottocanali series had been the logical choice, as it was recognized as "an excellent amplifier within the industry - compact, high powered, top quality and with an attractive price."
The Symetrix Radius matrix router, also provided by Axente, runs Dante protocol. The network architecture is designed around a master control room and two subsidiaries linked by Dante. Taking analogue feeds from the Symetrix matrix router's Dante extension cards, the 12K4 devices feed the low-end sections (mono bridged at 8 ohms) and the 4K4 manages the mid and high sections.
The design for the privately owned Parc Olympique Lyonnais was conceived by renowned architects Populous, who were also behind the Emirates and Wembley stadium in London; it is the third largest sports venue in France and arguably the most advanced.
Nicolas Houel, technical manager at OL Images commented, "In terms of audio qualities, we wanted something that would be impeccable. We wanted to broadcast any source in any areas of the stadium, hence the Dante matrix. When people come to this stadium, they get a real show, both visually and sonically. The result is a great installation for football fans which will resonate in the years to come."
(Jim Evans)
