WELLINGTON, New Zealand – Multi-Media Systems recently upgraded the sound system for the 2,210-seat Michael Fowler Centre Auditorium with JBL CBT Constant Beamwidth Technology column loudspeakers.
Among the auditorium's distinctive features are a three-level glass façade and interior detailing of native timbers and Italian marble. The two-level, oval-shaped auditorium's acoustics are well-suited for classical music concerts, and the venue is also used for events, meetings, tradeshows and other functions.
Sam Johnston, operations manager of AV company Multi-Media Systems Ltd., noted that the original sound system, which consisted of "many small loudspeakers," had been producing less-than-satisfactory results. "The coverage wasn't uniform, and the frequency response varied depending on where you were sitting," Johnston said.
Working with Matt Chapman and Marcus Wilson of Jands New Zealand (Harman's local distributor), Johnston and Matt Hoyle of Multi-Media Systems ultimately chose JBL CBT Constant Beamwidth Technology column loudspeakers.
They are deployed in an unusual configuration – a single CBT 70J speaker with a CBT 70JE extension enclosure, complemented by two CBT50LA speakers on either side, with each aimed 90 degrees to the left and right. The entire cluster is flown from the ceiling of the auditorium.
"We didn't need a large-scale sound reinforcement system to deliver rock concert levels. We were more concerned with getting even coverage and maximum clarity and speech intelligibility, for pre-show announcements and general public address," said Johnston.
"What we did need was very good pattern control and consistent coverage both closer and farther away from the speakers," Johnston added. "We chose the JBL CBT models because they are specifically designed to provide even frequency coverage regardless of the distance from the speakers, without the drop off in high-frequency response and level that you hear from other column designs."
Arriving at the final speaker configuration took some trial and error. "At first, we set up a single CBT 70J with the 70JE extension about 10 feet from the front of the stage and about 25 feet above the stage floor," Johnston said. "From the front row to the back wall, we achieved highly intelligible speech and full-range music reproduction, with no noticeable level variation over most of the seats."
However, the seats at the side of the stage and overlooking the stage were not adequately covered, and the seats around the downstairs walls did not receive enough high-frequency response.
The team of Multi-Media Systems and Jands NZ then tested a configuration using two CBT 50LA speakers, one on either side of the single, main CBT 70J/70 JE column, to cover the seats beside the stage.
"The CBT 50LA speakers can be set to provide midrange and high frequencies only, which avoided having too much bass energy being played into the room," Johnston said. "Ultimately, the JBL CBT Series speakers proved to be the ideal solution for the Michael Fowler Centre Auditorium. They delivered the coverage, clarity and sound pressure level we needed, and the small number of speakers required enabled us to install them in a way that didn't intrude with the aesthetics of the Auditorium, while also saving on the cost of the installation."
For more information, please visit www.harman.com.
