Certes KLEAR AUDIO KLR1m, User Manual

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The frequency characteristic measurement of emitted sound power is based on
summarized information about sound pressure in many points on main emitting
segment (of virtual spherical surface around a loudspeaker) of the
loudspeaker.
During the measurement, move the measurement microphone evenly, like drawing
imaginable cells, but do it in only in one dimension
– vertical or horizontal columns.
Vertical movement is more convenient, it is like “painting” one column after another.
Equability is not too important, but you cannot do it negligent way. It is recommended
to “paint” 12 -15 columns and perceive 12-15 sweep signals on each of them. Those
measurement principles are the same for loudspeaker systems of any size or placement.
There is one important measurement rule
– it is necessary to reach the reflecting
surface(s) (floor/wall). Last measurement column should be next to the wall.
Measurement should be done in a suitable distance which is not less than speaker size
and not less than distance to the closest reflecting surface (wall, ceiling, floor). In places
where close-up measurement is not possible (line array in hall), measurement results
may be influenced by the room. This influence may be both - positive and negative. The
estimation of this impact should be done by measurement curve analysis and careful
listening of the correction results.