Temasek Primary School reinforced with TOA
SINGAPORE: Founded in 1980, Temasek Primary School relocated in late 1999 to Bedok South Avenue 3 in the east of Singapore. The multi-purpose hall on the second floor is used for a variety of functions including sports, assemblies and musical performances. Together with the natural degradation of the original audio system, the school also cited feedback problems and a lower than required SPL output as the primary reasons for the upgrade. Systems integrators were invited to tender to supply, design and install a new one that would fulfill the varied requirements of the school’s needs.
A demonstration of speech, live music and playback through a TOA HX-5B compact line array speaker system by AV Media Pte Ltd ultimately proved to be the winning design. Working closely on the design with TOA Electronics, EASE software measurements conducted by project engineer Andrew Lim in the 33m x 30m room resulted in a L-R speaker design being installed. Each array comprising of two HX-5B arrays and a single FB-120B subwoofer has been wall mounted on either side of the 12m stage at a height of 5m.
The steps leading from the stage proved a problem for the AV Media team as the scaffold tower used to suspend the arrays had to be angled so that it lay flush to the wall. Weighing 16kg and comprising of five 12cm woofers, each HX-5B array operates within a 75Hz to 20kHz (-10 dB) frequency range dispersing its energy in a 100-degrees horizontal x 6-degrees vertical directivity pattern. The additional FB-120B subwoofers further extend the lower frequencies down to 40Hz (-10dB).
‘We had to customise the HY-CN1B brackets owing to the wide nature of the stage, which made the angle settings difficult,’ explained Mr Lim. To comply with safety standards, a chain has also been added to the bracket hosting its 51kg load. The delays for the rear of the hall have been handled by adding additional dual HX-5B hangs at a similar height on the lateral left and right walls.
The loudspeaker cabling has been routed along a service walkway to the upper level rear control room, which hosts the equipment rack and a previously existing Yamaha MGP32X analogue console. Here, three DA-550F four-channel amplifiers in bridged mode power the entire FOH system whilst an additional DA-250F model powers two HS-120B monitors suspended to the stage left and stage right for the benefit of the speakers and performers. A 2-in/6-out DP-SP3 processor incorporates the various DSP settings including crossovers, delays and filters. Two Abtus PWR-DA09C power conditioners not only offer peace of mind during lightning storms but also serve as sequencers. Although the windows to the control room can be easily opened, a pair of Yamaha MSP5 monitors extends the critical listening options.
‘Owing to the feedback problems associated with the previous wireless microphone system, we had to fully demonstrate that TOA’s UHF system was suitable for their needs,’ added Mr Lim. Eight channels of WT-5805 wireless tuners are paired with WM-5265 transmitters for the WM-5265 handheld microphones and WH-4000H cardioid headsets. Given the 1000 sq-m area of the 10m high school hall, four YW-4500 wall-mounted antennas together with two WD-4800 antenna distributors have been added to ensure full wireless coverage. Equipped with 64 selectable settings, each of the UHF tuners incorporate compander noise reduction circuits that help to minimise ambient RF noise.
Previously existing L-R projection systems assist audience members without a clear view. An Abtus Media Control switcher outputs the SDI and HD signals to the dual Panasonic PT-VW930 projectors from the fixed Panasonic cameras, PC and DVD player inputs. A third smaller Panasonic PT-EX16KE projector serves as a faith monitor.