The Hasseris Gymnasium & IB World School is a high-school founded in 1970 in Aalborg, Denmark. Designed in the modernist style, it has approximately 800 students each school year.
The main issue
Inside the school there is a multi-purpose hall whose sloped design is iconic and features in the school’s logo, being a central point for many activities and presentations like music shows, exams or graduation ceremonies. But that slanted design comes with a set of acoustic problems, with its high ceiling producing lots of reverberation. The RT60 measured before the acoustic treatment was in place was 1.84 seconds.
To solve the issues in this room, Claus Hansen from AudioExperts found a simple yet unique solution. He created a wedge made of mid and high frequency absorbers with low frequency absorption inside the custom made frame.
The proposed solution
Claus Hansen started as an Electronics Engineer and has more than 30 years of experience with professional audio loudspeaker systems, sound and acoustics, being a JOCAVI partner since 2006. An expert in our products, Hansen proposed some of JOCAVI’s ADDSORB REV absorber panels, mounted on the side walls in an angled design, and BASSLAYER panels on the back wall.
The ADDSORB REV was mounted in specially made aluminum stands to create an effective noise reduction solution and a balanced sound, enhancing both human communication and musical sound. These special stands were also designed to accommodate tuned panels inside the triangle shape to absorb the more problematic frequencies measured before treatment.
The results
This solution completely supported and designed with JOCAVI created a very balanced noise reduction spectrum, achieving 1.08 seconds of RT60 average and a staggering 41% of RT reduction. Below you can see the measured frequencies before and after inside the space. Note the huge difference around the 1000Hz.
JOCAVI has over 27 years of experience in acoustic treatment projects for large spaces, always finding an aesthetically pleasant solution with cost in mind. You can find our products in auditoriums all around the world, from east to west, north to south, and every project is unlike any other.