Genelec GLM 4 System Operating Manual page 66

Genelec Loudspeaker Manager (GLM) 4 - System Operating Manual page 66 of 87
Figure 37. Acoustic editor for Woofer Systems and info on the Flatness and Correlation for Woofer
Systems
In the acoustic editor of each WS/monitor pair, the following information (exclusive to Adaptive
Woofer System systems) can be found:
Paired with: The main monitor that the individual WS was paired with for calibration.
Calibration mode: The mode of operation chosen for the Adaptive Woofer System calibration
System x-over: The resulting x-over frequency between main monitor and WS.
System flatness: This is an indication of how flat the resulting calibrated system response is.
This figure is calculated using the system response from 25Hz to 500Hz.
A score of 100% means that the system is perfectly flat in this range, with a lower score indicating
there is some deviation.
Values in the range of 85– 95% can be expected for a good system setup. Values lower than this
(in all modes) would indicate that a change in position of listener, main monitor or Adaptive Woofer
System may be beneficial to produce a flatter response.
System Correlation: This is an indication of how well the Left and Right signals of a stereo pair
sum at the listener position. This figure is calculated comparing the complex sum (considering
phase) of the stereo pair to the absolute sum (ignoring phase). A score of 100% would mean that
(for a correlated signal) the summed response at the listener position that there is no destructive
interference. Values in the range of 90-99% are typical in a setup with good symmetry. Values
lower than this (in all modes) would indicate that a change in position of listener, main monitor or
Adaptive Woofer System may be beneficial.
Both the system flatness and correlation scores are designed as simple, quick objective measures
to be able to compare the resulting responses of individual calibrations and provide indication if
adjustment of the system setup is recommended. However, subjective evaluation should also be
considered when making decisions.