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Leading the field

The opening and closing ceremonies at the largest sporting event in south-east Asia relied heavily on wireless systems, writes Tom Bradbury

Performers in the arena used MI-808Rs to monitor music

ON 11 December 2013, the 27th Southeast Asian Games’ (the SEA Games) opening ceremony was held at the 30,000-capacity Wunna Theikdi Sports Stadium in Naypyidaw, Myanmar. The SEA Games is the

region’s biggest sporting event, held every two years. Eleven south-east Asian countries participated in the event with 5,000 athletes competing in 37 sports. Mipro was the main

wireless systems supplier for the opening ceremony and the closing event on 22 December. The audio equipment included wireless microphones, wireless in-ear monitoring systems and wireless intercom systems. Two groups of wireless mic

systems were used during the opening ceremony. The first contained four ACT-828 dual-channel digital receivers and one spare receiver, one AD-707a antenna divider and two AT-90W log antennas. Two ACT-80H handhelds were chosen for the masters of ceremonies, two BC-100 boundary mics with ACT-80T and MM-202 gooseneck mics for Myanmar’s vice president, and one ACT-80T fitted with

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an MU-53HN headworn mic was used for the flag captain. One channel for each of the above three regions is reserved for back-up. The second wireless

microphone system contained five ACT-74 quad- channel analogue receivers and one spare receiver, one AD-707a antenna divider and two AT-90W log antennas, of which 16 ACT-70H handhelds were for two programme presenters, the chairman of the Myanmar Olympic Committee, the athletes’ oath and singers to use.

KEEPING TRACK In such a large event, it is important for the presenters, singers, and all the thousands of performers to monitor the music and receive relevant information regarding the programme, so the wireless IEM system played a key role. The event featured eight monitor channels, matched with eight MI-808T transmitters. In order to avoid intermodulation, every four MI-808T transmitters’ output signals were integrated into one signal via an AD-808 antenna combiner. Due to the wide range

of the performances, the original 100mW output power of the MI-808T was unable to cover the range, so an AD-808 had to be connected to the AD-90A high-power amplifier which upgraded the output power to 1W to meet the requirement. In addition, in order to cover the wide dynamic for a large number of performers, sound engineers used the AT-100 circularly polarised directional antenna as a transmitting antenna. This device can effectively reduce the polarisation loss of the antenna and thus obtain optimal signal quality no matter what the vertical or horizontal pattern. The SEA Games used more than 400 sets of monitoring receivers and earphones for all performers.

ANTENNA SYSTEMS Mipro also provided seven AT- 90W wideband log directional antennas and two AT-100 circularly polarised directional antenna for the opening and closing ceremonies. Two AT-90W with ACT-828 digital systems were provided for Myanmar’s vice president, masters of ceremonies and the flag captain; two AT-

90W with ACT-74 wideband analogue systems were used for programme presenters, the chairman of the Myanmar Olympic, the athletes’ oath and singers; while another two AT-90W with ACT-74 wideband receiver systems and an AT-90W as a transmitting antenna with the intercom system MTS-100T and MTG-100Ra were provided to aid communication between staff. Two AT-100 with the MI-808T and MI- 808R IEM system enabled all performers to monitor music. Mipro senior sound

technical consultant Daniel Ku, who provided technical support to the event, says: “All wireless systems were


AUDIO All Mipro  ACT-828 dual-channel digital receivers

 AD-707a antenna divider  AT-90W log antenna  ACT-80H handhelds  BC-100 boundary mics  MM-202 gooseneck microphone

 ACT-80T transmitters  MU-53HN headworn mic  ACT-74 analogue


 ACT-70H handhelds  MI-808T and MI-808T transmitters

 AD-808 antenna combiner  AT-90W wideband log directional antenna

 AT-100 circularly polarised directional antenna

 MTS-100T and MTG-100Ra transmitters

 MI-808T and MI-808R IEM system

from Mipro. Its latest antenna system delivers superior signal transmission quality, especially in such a large sports field. Reception range and signal stability is the biggest challenge, as the shortest distance between the main stage and the mixing console is 150m, the longest is more than 350m. Mipro wireless microphone systems plus antenna systems are the gold combination to achieve a zero defects performance with excellent sound quality and stable reception. All sound team members were very satisfied with this task!” 

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