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You will be clipping either the mic preamp or the soundcard input. Remember that when setting up to make measurements the input to the soundcard is around -12 to -20 dB FS with a signal at around 75dB, which is to ensure that your measurement makes good use of the soundcard input range. If you look at the "Headroom" figure when making a measurement that shows you how much louder the measurement could get before it reaches the point of clipping the soundcard input. If you need to make high SPL measurement, go through the SPL meter calibration routine and adjust the input volume (or mic preamp gain) to ensure the input level at whatever calibration level you are using gives you enough headroom. For example, if you want to measure up to 105dB and you cal the meter with a 75dB signal, you need the input level to be no higher than -30 dB FS (75dB + 30dB = 105dB). When you cal the SPL meter in V5 it tells you the maximum SPL that can be measured with the current input volume setting.
 
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