REPORT 049
STOCKHOLM STADION
Company: Peavey Location: Stockholm, Sweden
Stockholm Stadion is the city’s most venerable sports ground, celebrating its 100th anniversary this year with a complete new audio system. With a running track and soccer field, it’s a versatile venue of wonderful charm. A tender for a new loudspeaker system preceded a whirlwind installation, with just two and a half weeks to get a stadium-wide system in and a MediaMatrix system programmed to control it. The team comprised Consultant Dick Hasselblad of Teaterkonsult Hasselblad, Acoustician Robert Nilsson, Project Manager Magnus Krabbe and Karl-Gustaf Kahlau, Senior Project Manager at Luthman SMTTS AB - ProAudi- oGruppen. While Patrik Eriksson was in charge of the MediaMatrix programming. PM Magnus said: “We had to create a very quick solution. I spoke with Karl-Gustaf Kahlau at Luthman and asked him if we could do anything together on this project. And he suggested we bring Robert Nilsson into the discussion. So that’s how it all began. At first we came up with a solution that was a bit cheaper than the final result, and the second solution that we came up with for them was the one that they bought - using Renkus-Heinz loudspeakers.” Karl continued: “I got a call from the consultant about the first solution that we made. He wanted a higher standard than our first solution. So he wanted us to come up with another, even though the first design actually met the original tender specs. They also wanted it to handle lighter music events. “So we agreed to use the Renkus Heinz TRX151, for the main loudspeakers, and we also upgraded to Powersoft K series amplifiers. We also supported them with the AES signal standard between the MediaMatrix system and the amplifiers. And Dick was comfortable with that solution – he felt that reached the standard that they wanted.” “We’d been looking at this project for many, many years, as had Robert. He’s been working for the stadium for 15 years so he knew the venue extremely well,” added Magnus. One of the big challenges was actually mounting the loudspeakers, since the venue’s historical status meant the team was not permitted to drill any holes or screw into the wooden structure. Additionally, the stadium management wanted
the loudspeakers to be as invisible as possible, and all of that entailed a light- weight, low profile product capable of delivering the high SPLs required. Extensive simulation work by Robert Nilsson was also key to the project. Robert said: “I’ve spent a lot of time using EASE 4.3 to calculate and map the direct coverage to achieve an even coverage and high SPL within the seating area, since the consult- ant wanted to keep the sound within the stadium.
“The weight of the loudspeakers themselves was also an issue, so it was a chal- lenging job to find the right solution – and Renkus Heinz TRX 151/9W and TRX 151/6W was the best choice,” he added. “Clio 10 was used to measure the loudspeaker impedance during set-up and installation, and I spent a lot of time using the 1.1 Beta version of EASERA [by AFMG] to measure the acoustics and to tune the system. We compared it with EASERA 1.1 and also against SysTune with excellent results, but in the end we felt most comfortable using the new Beta version of EASERA for documentation and final tuning. I then used SysTune for measuring and documentation of the maximum program and peak SPL since it has a user-friendly interface and a good reporting function for this purpose.” Other features the team chose included the Powersoft amplifiers, of which Karl said: “Robert found out that they are so much more efficient so the city is actually saving around 25% of the power budget by using these efficient amplifiers. So it’s an energy saving installation as well, and in the end one that saved the customer a lot of money.” The installation also included around 5,000 metres of fire-resistant, weatherproof speaker cable and fibre cable to connect all the racks with the MediaMatrix system using CobraNet protocol, making it fully digital all the way to the amplifiers. Four NION units are sited with one at each amplifier rack location. Each NION also has two Cat5 extension units to connect to a CobraNet redundant fibre network, and monitor the amplifiers and loudspeakers via an alarm panel and wireless con- trol panel. It also provides presets for different types of sports. Karl concluded: “Robert and I were here for the first time the system was used and it was highly successful – the system played well and the football team commenta- tor seemed happy with the sound. They played a lot of music during the game and a lot of commercials on the big screen accompanied by the loudspeaker system and they were very happy with the system.”
www.peavey.com
www.mondodr.com
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