Home Engineering Building Acoustics
A Noisy Service Dwelling
A mid-sized cinema featured a service dwelling located close to the main projection booth (a rather common feature of older facilities in Europe). The sound insulation between those two spaces was not high performance, being only 48 dB, as it had been thought that the director would be awake during operational hours. When a new director was hired, tempers flared quickly with the head operator. The latter, being a few months shy of retirement, found a nasty vengeance by fully turning on the small loudspeakers in the main booth, and with deadpan face explaining to the director that this was normal procedure for mishearing people. The unfortunate director only found out the truth with the arrival of a new head operator.
Lesson Learned: You had better know the technique before facing an old hand.
A Small Township Cinema
A small township cinema seating 80 was built in a French municipal building also housing a gymnasium and a municipal garage. It featured one cinema theatre and its attendant projection booth. There were a small entrance hall and a bar corner. Due to the different operating hours, those activities did not turn out to be a hindrance for each other, and as the building was stand-alone, there was no neighboring problem.
In another town, a new 250-seat cinema and its attending projection booth and entrance hall were built. In order to prevent the transmission of noise to the neighboring dwellings, a sizable (10 cm) expansion joint was left around the building. The noise from the mechanical equipment was controlled using an enclosed plant room and silencers.
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