Type

Select the C Weighted SPL Meter check box if you are using a C weighted SPL meter as the input to REW, measurements will then be corrected to remove the low and high frequency roll-offs of the C weighting characteristic. If a cal file is loaded the correction will only be applied outside the frequency range covered by the cal file.

Calibration

If you have a calibration data file for your SPL meter or microphone you can load the data into REW by clicking the Browse button. The corresponding response will be shown on the Filter Adjustment graph page. To remove the calibration data click the Clear Cal button.

To calibrate the REW SPL meter reading against an external meter select the source of your calibration signal (either a pink noise signal generated by REW and played through your subwoofer or a main speaker, or some external signal played through your system) and click the Calibrate SPL button. Adjust the figure in the dialog which pops up to match the reading on your own SPL meter, after clicking Finished the REW meter reading should be the same as your meter.

Note that if the signal generator is already playing a signal when you click Calibrate SPL it will continue to play the same signal.