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The Test Rig: PC: HP Pavilion t781.uk (3.4 GHz P4 HT, 1GB DDR, 250GB HD) Soundcard: Lynx Studio Technologies Ltd, Lynx 2B Microphone: Linearx M53 Precision Acoustic Measurement Microphone, Serial Number: 201467 Calibrator: Rion NC-74 Software: WinMLS 2004 Professional Level 6 Other: Auralex GRAMMA Subwoofer Platforms
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We calibrated the microphone using the Rion calibrator (shown below) so that it would correctly plot absolute SPLs on the frequency response graphs. This calibrator delivers a precision 1000Hz tone at 94dB +/- 0.3dB. The microphone has a 130dB maximum SPL capability; far more than we actually need for our purposes. It has its own built-in battery-operated pre-amp and is supplied with a file of correction values which was fed into WinMLS to correct for the slight variation in the frequency response of the mic and pre-amp. The sound card has a very flat frequency response to better than +/- 0.1dB across the frequency range we were working at. Overall, the frequency response accuracy of the whole rig is better than +/- 1dB from 10Hz to 40kHz. The subs were each placed on Auralex Gramma Platforms to provide some degree of protection from the rough playground surface. |
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