A white dot indicates a speaker position (Height Z=1m), A black dot indicates
a listening (mic.) position (Z=1m). Room size is set as (X=4.5m, Y=3.7m
Above curve is the frequency response at the mic position
in case we apply relatively flat sound source. Since mic
position is very close to the
sound source, response curve
is almost flat. After we confirm this, we move mic position to the listening
position. Then, we find out better position by moving mic front or back
or up or down.
|The tool I used is TOA's Speaker System Design Software. This tool gives
us simulation capability of sound intensity in the room. We can first define
room size, then set speaker(s) position and ceiling material whether it
is absorbent or solid in the setting window.
The system shows 2D sound intensity pattern. Red shows high intensity and
blue shows low. Then, we can set or move the listening (=mic) position
by the mouse. Then frequency curve at the mic position is shown. Therefore,
we can find out best position. In this case, ceiling factor is only considered.
Intensity displays are both for sound pressure level and sound energy level
depending upon our needs.