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You need to first create a soundcard calibration file.

Until that is accomplished there are no connections to an SPL meter or sub or receiver required.

Simply connect a loopback cable from the right channel line-out to the right channel line-in. Be sure to select the right channel for the input channel on the REW Settings page.

Run the soundcard Calibration Measure routine and save the file with the Make Cal button.

Now, with the loopback still in place, run a Check Levels routine (select Main speaker to Check/Set Levels), and when done, exit the Settings page and run a Calibrate routine (select Use REW speaker Cal signal) and set the level to 75dB.

Now run a Measurement from 0-20000Hz and the result should be a flat trace.

Remove the loopback and use that calibrated channel for the SPL meter and connection to your receiver.

brucek
 

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if using the same soundcard now, can that be used instead of going thru the whole routine again?
The soundcard calibration file does not need to be re-created.

The Check Levels and Calibrate routines need to be run each time you use REW or change any levels.

Any input is greatly appreciated.
For subwoofers, always use the standard Vertical graph axis of (45dB - 105dB) and the Horizontal graph axis of (15Hz - 200Hz) using the Graph Limits button in the top right corner of REW.

brucek
 
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