Genelec Loudspeaker Manager (GLM) 2.0 - System Operating Manual
page 20 of 55
Automatic Calibration Using GLM AutoCal
GLM AutoCal is a powerful monitoring system calibration algorithm running inside the GLM
software. Sweeps are generated by each monitor in a group. Responses are recorded with the
GLM measurement microphone into your computer.
The computer analyzes the sweeps and calculates the frequency responses for all monitors and
subwoofers, then optimizes level and delay to compensate for differences between monitors, and
sets equalization for the individual room responses to remove colorations caused by the room and
the location where the monitors have been installed. The end result is to have sound from all
monitors arriving at the listening position at the same time, same level, and compensated for the
effects of the room acoustics, resulting in very accurate imaging and reliable monitoring.
Each monitor group has its own acoustic settings. This is one of the important features of GLM 2.0.
Each setup file can contain several monitoring group definitions each with different AutoCal
calibration settings.
Even with the same set of monitors you can determine several listening positions by applying
calibration in several locations and defining each location as a new group. For example, one group
can be ‘Engineer Position’ and another ‘Producer Position’. Each can have its own calibration.
Then, selecting the group in the GLM 2.0 software quickly loads all acoustic settings specific for
each microphone position.
To calibrate a monitoring group
•
connect the measurement microphone to the GLM network adapter
•
enter the serial number of the measurement microphone (each specific measurement
microphone calibration file is stored in the software)
•
select either a single location measurement (SinglePoint) or measurements of multiple
listening positions (MultiPoint)
•
specify whether a pair of stereo front monitors should receive different calibration filters
(tickbox ‘unselected’ – example: useful for unsymmetrical setups where one monitor is in a
corner and the other free-standing), or if the same calibration filters should be applied to
both monitors (tickbox ‘selected’)
•
place the microphone at the listening position, at ear height
•
double-click on the measurement microphone icon to start the measurement
•
wait while AutoCal measures all monitors and subwoofers and then optimizes each monitor
and subwoofer
•
click ‘Confirm Calibration’ to accept and save the settings
•
if there is a subwoofer in the group, the next step of the process is the automatic
adjustment of the phase (AutoPhase)
See section Advanced use of AutoCal for more detailed information on the calibration process.
