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Exclusive: TMB banks on Sonos Libra to enhance AGMs

Exclusive: TMB banks on Sonos Libra to enhance AGMs
The 498-seat auditorium has a depth of 15m from the lip of the stage to the rear wall

Exclusive: TMB banks on Sonos Libra to enhance AGMs

Thailand:

Having started operations in 1957 in Bangkok, the Thai Military Bank was founded to provide exclusive financial services for military units and personnel. With subsequent development and growth, the bank was renamed to TMB in 1994 to more accurately reflect its changed status to a public limited company and relocated to its current headquarters on Phahon Yothin Road in which a seventh floor auditorium is used for functions such as annual general meetings (AGMs) of shareholders.

Providing even dispersion, the nine Adamson IS7 speakers are configured as an L-C-R system
Providing even dispersion, the nine Adamson IS7 speakers are configured as an L-C-R system

TMB recently enlisted the services of its maintenance and service contractor Multiline Professional to provide a new loudspeaker solution in the auditorium, hence replacing the Ramsa system that had been in situ for 25 years. In turn Multiline Professional requested the services of Thai distributor Sonos Libra to provide a design for the fan-shaped auditorium with its 498 seats requiring a wide dispersion speaker system. The challenge was to provide even SPLs across its wide diameter, in addition to sensitively containing them to the audience area located within the 15m stage-to-rear wall distance.

‘When Sonos Libra was asked to create a design for this room, I immediately thought that a point source would be the right solution,’ commented Sonos Libra chief Alfonso Martín. ‘The wide shape of the auditorium coupled with the low ceiling height rules out a conventional line array system.’ Following room calibration and EASE modelling, Martín was surprised by the revelation that the new Adamson IS7 line array system perfectly fitted the space. Measuring 122mm high x 527mm wide, the dual 7-inch cabinet is not only compact in size – it’s powerful.

TMB relocated to its current headquarters on Phahon Yothin Road in 1994
TMB relocated to its current headquarters on Phahon Yothin Road in 1994

‘When modelled as an L-C-R system with three birch ply cabinets in each array, the projections showed optimal horizontal and vertical dispersion across the entire audience seating.’ The Adamson waveguide with its slightly curved wavefront creates a nominal dispersion pattern of 100°x 12.5°. Operating within an 80Hz – 18 kHz (+/- 3dB) frequency spectrum, the two-way design’s feature set is further enhanced with the addition of Controlled Summation Technology that further eliminates low-mid lobing. Located in both sides of the stage, a total of four IS118 single 18-inch subwoofers provide low frequency extension down to 35Hz when required. The front-fills are catered for by four Point Concentric 5 coaxial loudspeakers neatly integrated into the lip of the stage, each creating a 70° conical dispersion pattern.

From the mix position located in the dedicated control room at the rear of the seating area, the facility manager can control all the audio parameters from the Allen & Heath dLive C3500 digital console. Audio workflows are managed from the dual 12-inch capacitive touchscreens for which Harmony UI integrates screen and wrap-around controls. The 24-fader digital board features over six layers, built-in audio I/O and a networking port for connection to the dLive DMO MixRack fitted inside the technical rack.

An Allen & Heath dLive C3500 console networks with six DX164 wall-mount expanders
An Allen & Heath dLive C3500 console networks with six DX164 wall-mount expanders

Audio signals are routed from the etherCON ports of the four DX168-W 16-in/4-out expansion units within the venue to the dLive MixRack over a Cat-5e cabling infrastructure. A second locking etherCON port provides daisy chaining and redundancy. Finally, simple facility operations in the form of source selection and volume control can be applied from one small Allen & Heath IP-1 remote control wall plate that interfaces with the dLive mixing system. Wireless control via the iPad dLive app is provided as well. Dante networking from the microphone points on stage, back of the venue and foyer to the dLive C3500 is enabled with the addition of six Xilica RIO R22-P I/O surface wall-mount panels located to the sides of the stage.

Mr Martín and his colleague Simon Rains relied upon Smaart 8 analysis and Earthworks calibration microphones to execute the design of the remodelled auditorium. The entire Adamson speaker system is powered by a combination of four D80:4 and D40:4 Lab.gruppen amplifiers, which receive the main signal from the Dante network and an analogue backup. Providing surge protection in addition to one-touch power-on and power-off operations, a pair of PX128B power sequencers has been added to the control room rack. The Shure SLX2 wireless microphone system remains in place, which can be monitored and controlled using Wireless Workbench Manager software.



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