Calibrating the SPL reading gives REW an absolute SPL reference by entering
a reading from your SPL meter while a speaker or subwoofer calibration signal
is playing.
- Select the Mic/Meter
tab of the Settings panel
- If using an SPL meter set it to C weighting and tick the
C Weighted SPL Meter box in the Mic/Meter
Settings. Set the meter range to suit the measurement level used in
the check levels process
(the 80dB range is recommended for the Radio Shack meter). If using
a mic and preamp leave the C Weighted SPL Meter
box unticked
- Choose whether to calibrate the meter reading using your subwoofer
or a main speaker driven by a calibration signal generated within REW,
or to use a test signal you provide, making the appropriate selection
in the drop-down box in the Calibration
panel.
- Press the Calibrate SPL button
- Enter the reading from your SPL meter in the calibration panel and
press Finished when done
The SPL Calibration process can also be run from the
SPL Meter panel
- A warning is shown if measurements are attempted before
calibrating the SPL reading as the results of the measurement would
not reflect the actual SPL. The SPL reading is shown in red
until the SPL calibration procedure has been completed
- REW remembers the calibration setting for the next startup,
so it will usually not be necessary to repeat this process, but check the
REW SPL reading against your SPL meter before starting a new set
of measurements
- If the input volume setting is changed or another soundcard input is
selected it will be necessary to repeat the calibration process
(selecting a different input or input device will cause REW to
treat the SPL reading as uncalibrated - the reading goes red).
REW is now ready to
make measurements.
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