Sydney Opera House Opera Theatre
In 1998, we designed and commissioned a loudspeaker system for the Opera Theatre to meet the unusually demanding specifications for clarity and tonality, whilst accommodating restricted loudspeaker locations. As loudspeakers with high directionality over the full frequency range were required, Glenn designed large line-arrays of midrange horns and subwoofers utilising his techniques for array beam-steering and directional control. This system used JBL drivers and horns in a highly customised configuration.
An important achievement was the successful prediction of the radiation pattern of the two arrays of horns used for lower midrange and upper midrange frequencies. Our predictions were very close to measurements made by JBL in the USA.
Foyer of the National Museum of Australia
The Foyer of the National Musemum is large and extremely reverberant, and is the focus of many of the Museum’s public events. Acoustic Directions has recently designed acoustic treatment to prevent specular reflections from causing echoes, and is in the process of designing and commissioning a sound system to provide good speech intelligibility and music clarity in this very difficult acoustic space. Our system uses a commercial cardioid line-array system and beam-steered subwoofer array, and we propose to improve the performance of the line-array system by applying frequency and phase tapering to each low/mid element in the array. This will be designed using VLADA, our in-house loudspeaker array design software.
National Museum of Australia
Following an Australian Government Review of the Museum’s operation, Acoustic Directions undertook an audit of the speech intelligibility of the audio associated with the Museum’s permanent exhibitions. In 2006, we designed a directional loudspeaker system for the new Dari a Krar exhibition, which is housed in a highly reverberant space; our goals being to hold the acoustic spill to other areas to an absolute minimum, and to reproduce the music perfomance of this indigenous exhibit with absolute fidelity.
Country Club Tasmania (Casino)
In 2005, on behalf of Technical Audio Group, we designed and commissioned a concert loudspeaker system for the casino’s main auditorium using the Martin W8LM line array loudspeaker. As the manufacturer had not yet released design software for this speaker, we generated our own computational software to optimise the coverage and frequency response of the arrays.
Hornsby RSL Club Sydney
Glenn Leembruggen designed and commissioned a line-array sound system for use by rock and cabaret artists in a large auditorium. A special bass-speaker array using Martin WSX cabinets was designed for the clubs’ builder to provide high impact bass for listeners and the dance floor whilst reducing sound leakage through the auditorium side walls by some 10dB. In acoustic-isolation terms, this is an extremely large increase in the effective transmission loss of the walls.