Genelec Loudspeaker Manager (GLM) 4 - System Operating Manual
page 46 of 87
Figure 26.The standard loudness SPL calibration.
After calibration, click the ‘Confirm’ button to save the results and return to the main page.
After SPL calibration, the main page level control starts displaying the level on dBSPL scale, and
the preset levels change to show dBSPL units. The Level Preset 1 is set at the level given in the
Loudness Standard, for example 73 dBSPL for EBU R128. Also notice the graphical link-line
between the Cal. Level ‘SPL’ indication and Level Preset 1 keys.
After an SPL calibration, you can use the Cal. Level key to toggle between displaying levels in dB
SPL (absolute) scale or in dB relative to the full scale.
Note: If you want to verify the absolute SPL level display later, the same input level and reference
signal should be used as indicated by the standard used. Otherwise the dB SPL level indication
can erroneously set lower or higher, meaning that the SPL level of e.g. music material is not
consistent with the SPL reading indicated by the master fader.
