Beijing / China,

Over 40 Channels of Shure Wireless Systems Supported “Korean Music Wave” Super Concert to Make its Debut in China

Axient, UHF-R, and PSM1000 overcome interference, ensuring a top audio feast

Beijing, October 2014 - On the night of October 25, 2014, the leading K-Pop concert Korean Music Wave made its debut in China, kicking off at the Beijing National Stadium. Sixteen top South Korean idol groups performed on stage, devoting three and a half hours to this music fest. The stable performance of Shure Axient Wireless Management Network, UHF-R Wireless Systems, and PSM1000 Personal Monitor Systems ensured that this high standard concert would provide the best audio-visual effects.

Korean Music Wave is organized by the Korean television channel MBC, and offers the most lavish stage production with the largest collection of top South Korean pop idols. This time, MBC brought Korea Music Wave to China for the very first time, with the debut performance kicking off in China's largest stadium - The Beijing National Stadium.

To ensure that the show was presented in its original form for the Chinese audience, MBC brought a group of nearly 400 people to the stadium to set up all the audio, lighting, and choreography strictly in accordance with the highest standards. To achieve the best audio transmission effects, Korean Music Wave chose Shure Wireless Systems, including 16-channel Axient, 22-channel UHF-R, as well as the multi-channel PSM1000 and PSM900 Personal Monitor Systems.

Shure Wireless Systems easily deal with on-site interference issues

The RF environment of the performance location is very complex, creating major challenges for wireless devices. According to the Shure application engineers Allen Bu and Jason Wu, who provided on-site support, since the large LED screens produce a lot of RF interference, LED noise must be avoided when calculating available frequencies; backup frequencies for Axient are also stretched. By using Shure WWB6 Management Software, available frequencies and backup frequencies can be calculated efficiently and accurately. The AXT600 Spectrum Manager can calculate compatible frequencies and assign them to networked wireless systems, and monitor the backup frequencies of the RF environment in real time and rank them according to quality.

During rehearsals, Shure engineers mentioned that interference occurred frequently and suddenly near the 600MHz range, and thus the Axient system-specific interference detection and avoidance function played a crucial role. When burst interference signals are strong enough to affect the main frequency, the receiver's main frequency would quickly switch to the calculated backup frequency. The transmitter's operating frequency will switch at the same time to ensure normal operations. The engineer set the interference detection mode to automatic on the receiving end so that when a burst of strong interference affected the current working frequency, the receiver would show that the working frequency was disturbed and automatically switch frequencies.

When burst interference signals were weak and wouldn't impact the quality of the carrier frequency, the AXT400 receiver's panel would show a red warning indicating that the Axient receiver would also automatically detect slight wireless interference.

The Axient system's Showlink signal access point was used to remotely control all Axient transmitters. With such a large stage, the engineer's design used two Showlink access points, including one access point equipped with an omnidirectional antenna facing one of the stage's side extensions and the middle walkway, and the other using a directional antenna facing the center of the stage and the other side extension. The transmitter's built-in Showlink test function was used to test the full area of the stage to ensure good coverage of the Showlink control signals.

Appropriate use of antennas for better audio signals

The stage for this live performance was a unique U-shaped stage. It was very large, and in addition to the main stage also extended 100 meters outwards from both the entrance and exit of the stage. Most singers would sing and dance all over the stage and extensions, causing great difficulties for audio transmission. The engineers had to consider the signal reception of the wireless microphones and ensure comprehensive coverage of the monitoring system's transmission signals. Thus, setting up the antennas and using the RF feeders effectively became very important tasks.

To ensure clear and uninterrupted transmission of the wireless microphones, Shure engineers used a UA874 on one side of the stage to cover the center of the stage and the extension located at the stage entrance. On the other side, the engineers used the HA8089 helical antenna and chose an appropriate suspension height to cover the center and the area extending out from the stage exit. Also, on the side of the 8089 antenna, a Shure UA830 antenna amplifier was used to compensate for feed losses. The RF history function of the Shure WWB6.0 software was used to perform movement tests, and the angles of the antennas were fine-tuned based on signal strength to ensure that the signal strength of all transmitters exceeded -70dBm, thus guaranteeing stable RF signals regardless of the performer's location.

In terms of the PSM personal monitor antenna design, Shure engineers installed two HA8089 antennas on each side of the stage. Two 8089 transmitter antennas on each side pointed to the near end and far end of the U-shaped stage respectively to cover the entire stage monitoring area. Once the four antennas were installed, the engineers used PSM bodypack receivers to walk about the stage, continuously testing the coverage and adjusting the HA8089 angle for blind spots to ensure that performers receive stable monitoring signals on the entire stage.

The Shure PSM antenna combiner's output terminal used Shure dedicated antenna distribution system for connecting transmitting antennas. In choosing the RF feeder, through calculations, high-quality, low-loss Belden 9914 and Shure UA8100 feeders were chosen to ensure reasonable transmitter signal gain.

Review of Shure products from audio director

When it came to the acoustic effects of the concert, Mr. Tae Jeom Sik, the audio director responsible for the show's live sound, said that he was very satisfied with the performance of Shure products, the excellent stability and security of Axient especially stood out. Mr. Tae Jeom Sik has been using Shure products for over 10 years, and has used the UHF-R Wireless Systems and PSM Monitoring Systems in previous works repeatedly. From his perspective, Shure products are very durable, can adapt to a variety of harsh environments, and offer very good RF performance. He personally is partial to the sound of the Beta87A microphone, because he believes that the supercardioid pattern provides maximum isolation from other vocalists or instruments while producing bright sounds at the same time, making it suitable for concerts and performances by most Korean artists.

Tae Jeom Sik had used the Axient system before in Korea, and after this show, he now has a more profound understanding of the Axient's superior functionality and plans to use this product in high-end live performances in the future. The sound engineers were under big pressure when ensuring a smooth performance at the Beijing National Stadium. The Axient receiver is equipped with a high-sensitivity interference detection circuit that can immediately warn users when radio interference occurs, and switch to an interference-free, compatible frequency in a few milliseconds, thus offering greater security for sound engineers.

Shure products provided the greatest support and contributions for this amazing festival, while a dream-like lineup put on an unprecedented musical feast for fans at the Beijing National Stadium.

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