JBL SDP-75, User Manual, Page: 148 / 157

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18.2 MULTI-POINT CALIBRATION PROCEDURE
Multi-point measurements can be performed sequentially using the same microphone.
You can add a new measurement by pressing the “ Add ” button at the bottom of the page, or delete the selected
measurement by pressing “ Delete ”. You can also rename a measurement by editing the text box "Measurement name".
For each measurement, the “ Calibrated ” column indicates “Yes” if the measurement has been correctly performed, “No”
if it has not, and “Partial” if the calibration was interrupted before completion.
Each measurement contains the responses recorded during the calibration sound sequence.
Select the required measurement and press the “ Calibrate ” button to launch the calibration sequence.
Once every measurement has been calibrated, you can compute the acoustic correction filter that will best fit every point,
accordingly to their weight.
Figure 108: List of measurements
18.3 WEIGHTING MULTIPLE MEASUREMENTS
The “ Weight ” column allows you to set a weight to each measurement, from 0 to 100, to emphasize, for example, some
central points. You can bypass some points by setting their weight to 0, which can be useful in case one of the points
have failed the calibration but you don’t want to perform a calibration again.
The weight can be adjusted after a calibration; you don’t have to run a complete calibration to take weight changes into
account, just to press once the “Compute” button.
You can adjust the weight of the measurements with your mouse clicking on +1 or -1, or with your keyboard, with the up
(+1) and down (-1) arrows, or the page up (+10) and page down (-10) keys.
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All the measurements with non-null weight should be fully calibrated before computing the acoustic correction
filters by pressing the “ Compute ” button. If some are partially or not calibrated at all, you will have to remove the
bad points or their entire measurements, for example by setting their weight to 0, before being able to compute the
acoustic filters.
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The lock disables measurement settings edition.
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The “ ref ” column indicates which measurement is the reference point. The reference point is unique, it can be
modified after the calibration. Taking a new measurement into account as reference point requires to recompute
the compensation filters.
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Before saving your preset in the “Presets” page, you have to save the multipoint parameters by pressing the “ Save
changes ” button. These parameters are automatically saved (and the button disabled) when you leave the point
list, and when you run a calibration or a computation.