2005 - Cambrian College Music Department
In 2005, ProSonics was retained by Cambrian College to review acoustical issues with their percussion rehearsal room in their music department. Classes couldn't be taught in adjacent rooms while students were using the percussion room due to the noise. Teachers couldn't use their rehearsal rooms adjacent to the percussion room and teach students while the percussion room was in use. With increasing student enrollment and limited space, scheduling the conflicting needs of the users was becoming a problem.
ProSonics was asked to review the current percussion room as well as potential alternate rooms for the use, and make recommendations on improving the soundproofing of the room.
ProSonics identified several deficiencies in the current room, but after a thorough evaluation determined that the alternative rooms would not provide a better option. ProSonics proposed a number of improvements to the current room to maximize the soundproofing performance of what was there, and also additional improvements that would require a more significant construction effort. ProSonics modelled the sound attenuation through the walls of the room to determine the potential maximum performance of the existing walls if the deficiencies were corrected. It was found that the existing wall produced an attenuation of 25 dB(A), but had the potential of up to 40 dB(A) when the deficiencies were corrected. While an impressive attenuation, 40 dB(A) is insufficient when the percussion can develop SPL in excess of 100 dB(A). An attenuation of >60 dB(A) would be required so that teaching could occur simultaneously with percussion rehearsals.
Cambrian College decided to proceed with the work in stages over 2005-2007. The final product included fixing deficiencies in the existing walls, designing and installing a special acoustical barrier where a wall met up to a window (the result of previous renovations and reconfiguration of the space), removing the existing door and replacing it with a wider, acoustically rated door, and building a double-thick wall inside the existing room to reduce the sound transmission into the adjacent rooms and hallway.
The final results were walls with a measured attenuation of ~65 dB(A). With the percussion room in use, the teacher of classical acoustic guitar in the adjacent room can now teach unhindered.