Inside the 2,464-seat Hamer Hall, two CAL 64 column array loudspeakers provide "exceptional intelligibility without exciting reflective surfaces". These slender columns handle both emergency voice alerts and any speech applications with orchestral concerts, such as narration or comments from the conductor.
According to Nick Carroll, operations manager for sound at Arts Centre Melbourne, the combination of CAL and other Meyer Sound loudspeakers neatly fulfills both the hall's sound system design and acoustical requirements. "We have small Meyer Sound MINA arrays tucked away behind grilles for use with some amplified events," he says. "For orchestral concerts, the MINAs are not used and a solid wooden door slides in front of them. The adjoining CALs then cover the stalls and many of the upper seats without hitting the balcony front."
In Hamer Hall, the CAL systems are utilised in two modes. For limited voice announcement and voice alert, the CAL beams have a 30-degree spread and are aimed 12 degrees up. When used with the drop-down center cluster for conductor comments or narration, the CAL loudspeakers have a 15-degree spread aimed one degree down. These modes are activated through presets in the hall's extensive control and distribution system based on the D-Mitri® digital audio platform.
"We have used CAL for a number of performances, and we are tremendously pleased with the performance," says Carroll. "The frequency and phase response are extremely flat, and the level difference between the front and the rear of the stalls is minimal to the point of amazement."
While the CAL loudspeakers are always available, the setup for amplified pop and rock events remains stowed above the louvered stage ceiling and drops down only when needed. The main system comprises left and right flown arrays of nine Milo line array loudspeakers and one 700-HP subwoofer; a centre cluster of eight Mina line array loudspeakers; and four balcony delays each with six M'elodie line array loudspeakers and a single 500-HP subwoofer. Five M'elodie loudspeakers and two 700-HP subwoofers supply wide-stall coverage for each side.
In addition to concerts by the Melbourne Symphony and Australian Chamber Orchestra, Hamer Hall has been booked for shows by the Cape Town Opera, Rufus Wainwright, Macy Gray, the Legendary Count Basie Orchestra, and the folk rock band America.
Lead sound system consultant for the Hamer Hall project was John Alekna of Marshall Day Acoustics. The in-house team participating in system design included, in addition to Carroll, Frank Ward, Peter Ripon, Simon Austin, David Harvey, and Chris King, with additional contributions by Meyer Sound Design Services. The system was commissioned by Bob McCarthy with assistance from Chris Braun.
Principal architect for the Hamer Hall redevelopment was Ian McDougall of Ashton Raggatt McDougall Architects, and the builder was Baulderstone.
(Jim Evans)
