NTi’s XL2 helps to make Namdong stadium ready for the games
SOUTH KOREA: The Namdong Stadium, which is due to host the upcoming Asian Games later this year, has had its sound system analysed and configured by installation specialist Sovico using NTI Audio’s handheld XL2 audio and acoustic analyser. The newly conceptualised stadium will showcase the Asian Games 2014 rugby tournament.
The goal of analysing the system was to measure the speech intelligibility and the sound pressure level generated by the new installation. The measurements were performed by Gun Chang Moon MSc, the senior audio and acoustic consultant at Sovico, utilising a combination of the NTi Audio Minirator MR-PRO and the XL2 acoustic analyser. Prior to this final testing, Mr Moon used the instruments to verify the polarity and the balanced signal quality of all speakers, before optimising the announcement system’s acoustic performance.
‘Thanks to the handheld XL2 acoustic analyzer I was able to verify the speech intelligibility of the entire stadium within less than one hour,’ Mr Moon reported after completing the project. ‘Additionally the automated result documentation offered by the XL2, mapped to the pre-determined grid saved a lot of time in producing the final reports to our customer.”
There are 42 reference positions in total throughout the stadium. Within the 8100-capacity seating area, Mr Moon assigned 33 representative measurement points, with a further 9 nine points selected on the field. The Minirator was connected to the audio system in the audio control room and generated the dedicated speech intelligibility test signal. The test signal was broadcasted throughout the stadium at the default announcement level, with the XL2 simultaneously measuring both the speech intelligibility and sound pressure level at the assigned locations. The append mode of the XL2 was also used to provide automated data recording mapped to the grid of measurement points.
Recorded sound pressure levels in the stadium ranged from 77dB at the outside seats up to 90dB around the middle area, with more than 95% of the seating area providing speech intelligibility (STI) higher than 0.55. At the middle seating area Sovico even measured up to 0.84.
On the field itself, an STI of 0.75 was achieved on average with a sound level distribution of +/- 3dB.
With the system now ready to go, Mr Moon assures the audience and athletes at that upcoming Asian Games that they can expect optimised speech intelligibility in the Namdong Stadium.