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The measurement is usually done using a sweep signal in a certain frequency range.
Before creating the frequency plot, the impulse response should be cut in time
domain to extract a window of only the direct sound.
The frequency response should be measured in best case for all speakers
individually. This could be done simultaneously with the SPL measurement, so the
microphone has to be moved around only once. If it is not practicable to measure all
speakers, at least some different speakers should be measured and combined
together to get an average measurement.
The measured frequency response can be compared to the predefined target curve
and adjusted interactively by using the controls in the WaveDesigner EQ Panel.
There are different recommendations for the EQ target curve of a sound system. For
example the ISO X-Curve for cinemas defines a flat curve up to 2 kHz and above
that a slope going down by 3 dB per Octave. For music content, normally less steep
slopes are used.
The Output EQ settings in WaveDesigner are stored only once and should be used
to tackle existing holes and peaks in the frequency response. The target should be a
more linear and neutral curve.
For adapting the system to different kinds of content or to get a taste of the
operating sound engineer, it is recommended to use the Input EQ in the
WavePerformer.
