[brucek]

Hopefully you're using stereo adapters on your line-in and line-out jacks of the soundcard, and only using one channel of those adapters (usually the right).

Ensure the sub is on and the rest of your speakers disconnected (or external power amps off if you have them).

Have the normal sub crossover set (80Hz for example).

Have your receiver in STEREO mode with speakers to small.

First you should SET MEASUREMENT LEVEL and adjust your receiver volume to 75dBSPL on the RS meter in your listening position. Now we know the room is at 75dBSPL. Output done.....

Next SET INPUT VOLUME. Input done.

Next CALIBRATE the REW SPL meter to the RS meter. Now both meters match.

The next one time event is to put a short between the line-in and line-out and Measure Soundcard Response to create soundcard calibration file and save it, so it loads every time hence.

Put your normal cables back on.

Now set the TARGET LEVEL.

Then AUTOMATIC MEASURE to 200hz. Use horizontal axis of 15Hz to 200Hz and vertical axis of 45dB to 105dB.

brucek