NTi Audio Acoustilyzer AL1 - Manual (Page 61)

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9. Select typical locations, such as positioning the microphone
at 1 - 1.2 meters above ground in sitting areas or 1.5 - 1.8 meters
in standing areas (typical worst-case measurement positions are
normally not directly in front of the speakers)
10. The person taking the measurements should be out of the acoustic
field, so as to not affect the measurement results. For this purpose
the measurement microphone can be mounted on a mic stand and
connected electrically (using an extension audio cable) to the AL1.
11. Low STI-PA readings can be caused by
• Excessive sound reverberation, echoes or reflections
• Poor speaker directivity or speaker coverage
• Speaker power setting not in order (e.g. low signal-to-noise ratio)
• Incompatible speaker polarity
Please see the NTi Audio website or Appendix for further information.