IMPORTANT NOTE: In order to perform a proper calibration it is important to carefully read the entire
chapters including Essential Tools and Settings and Getting Ready for Calibration to learn about the
SDP-75 audio clock settings, audio utilities (metering tools, pink noise and solo/mute buttons) and
microphone placement recommendations.
13.1 OVERVIEW OF THE CALIBRATION
PROCEDURE
If your speakers have been specified correctly, the calibration process is a relatively straightforward process:
1. Adjust the master output level to achieve high quality measurements;
2. Start the automated calibration: The SDP-75 will measure each loudspeaker in the room;
3. Compute the measurements;
4. Save the preset.
13.2 ADJUST THE MASTER OUTPUT LEVEL
To access the calibration page from the SDP-75 Main page:
• Click on the Gears button in the top menu to open the Advanced Settings user interface.
• Go to the Level and Delay Settings/Calibration page.
The system requires a minimum Sound Pressure Level for proper calibration. Until that minimum SPL is reached, the
test signal will keep playing through the same speaker. For safety matters, we recommend to perform that first
calibration as if it were a test.
• Set a safe output level:
1. Decrease Master Level to -40 dB;
2. Press the Mute button to cut the outputs (this step must ALWAYS be performed before pressing
on the Calibrate button);
3. Press the Calibrate button in the Calibration tab in the Optimizer Settings page of the Advanced
Settings interface;
4. Follow the on-screen instructions regarding the microphone.
• Adjust the output level:
1. Increase the master level until the test signal moves on to the second speaker;
2. Use the SDP-75’s metering tools in the Processor/Meters page to check the level of the
microphone inputs;
3. Use your ears to evaluate the perceived SPL of each driver and, if possible, increase the master
output level to ensure that an optimal SPL is reached for all the speakers. This will also improve
the quality of your measurements;
4. Use the Cancel button to stop the calibration (optional).
During this process you will need to move back and forth between the calibration page and the metering page:
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