Intelligibility measurements – Blåsenhus, Uppsala universityinfo
Springwell Audio has completed a series of measurements and documentation on behalf of AV-Huset Ljud & Bildteknik AB. A comprehensive suite of audio visual systems has been installed to assist lecturers in delivering their course content. Devices such as interactive whiteboards, projectors, microphones and sound reinforcement systems are used to make the daily working environment more comfortable and effective for both lecturers and students alike.
AV Huset LBT were able to use the data to provide evidence of conformity to the consultant’s and client’s design criteria.
Springwell Audio provided assistance in verifying and documenting the speech intelligibility (taluppfatbarhet), sound pressure levels (ljudtrycksnivåer) and frequency response (frekvenskurva) for the audio systems installed in the lecture theatres (hörsaler). Room Capture software along with class 1 measurement equipment and calibrators were used to gather the required information which was then assembled into a set of documents including a report on procedures and findings.
Springwell Audio AB provided project management and design services for the newly opened Swedish National Arena in Stockholm.
The project spanned almost 4 years in total dating back to the composition of the initial design specification through to final completion and handover.
Company owner, Steven Liddle, acted as consultant to PEAB, the main contractor for building and fitting out of the arena.
The PAVA system provides reinforcement and reproduction for sport, concerts and a host of other events as well as fulfilling the life safety function.
Audio distribution is based around a dual redundant, single mode fibre network with port level monitoring of links. Dante digital audio provides an extremely flexible routing and distribution system with both primary and secondary enabled on separate VLANs. This level of resilience ensures maximum uptime in the event of an equipment failure or damage to fibre.
2Processing and amplification are from the Electrovoice Netmax and Contractor Precision Series respectively. XLVC (XLD281) line arrays and EVH point sources provide coverage in the bowl whilst a variety of Bosch loudspeakers provide coverage of the 100V distributed system.
Successful arena installation – IFK Norrköpinginfo
Springwell Audio Services was responsible for the electroacoustic modelling of the winning bid using the industry standard software package EASE (Electroacoustic Simulation for Engineers). The design goal was to meet the criteria set by project consultant and leader, Mikael Bergvall of MICAB.
Computer simulations involve the construction a 3 dimensional wireframe model which details the dimensions and types of surface materials of the subject building. Once defined, the designer is able to try out several possible system layouts and can also quickly substitute different models of loudspeaker. Comparisons can be made between frequency response, coverage, maximum sound pressure levels, speech intelligibility and much more.
The freedom to change the design before anything has even been installed is a significant cost saving and risk management for buyers and installers. A high degree of confidence can be placed in the simulations. There is always a certain amount of adjustment to be made during installation but the results are generally very similar to the predictions.
The Norrköping IFK arena combines a voiced alarm function with the main public address system in the main stands. The system complies with European EN60849 requirements as well local Swedish recommendations.
BSS Soundweb London digital signal processors handle the distribution and processing of audio around the arena. A self healing redundant digital audio network ensures that the system is always available for general announcements and more importantly, emergency or evacuation messages.
The audio signal is retained in the digital domain all the way to the amplifiers by employing AES/EBU digital transmission from the BSS frames to the Crown I Tech amplifiers. This minimises the opportunity for noise to enter the audio signal chain.
It was great to see and hear the system finally in place after all the hard work that was put in at the design stage. Often it is difficult to get to grips with the scale of the building when working in the computer model. Only when you visit the finished site does it really sink in.
This was an ambitious undertaking by Norrköping Football Club and I believe they have succeeded in setting a very high standard for sound quality in sports arenas in Sweden.