[alzard]

I wouldn't take any measurements until the soundcard had been calibrated and you have downloaded the proper meter calibration file. They will be quite inaccurate until you do so.

Read REW Help Files on calibrating the soundcard.

Download the meter calibration files from our download page.

Once that's complete and you've checked the soundcard calibration file for accuracy - take some measurements.

brucek

Hi Bruce, I have a question is if I use use the left channel as reference, do I still need to calibrate the sound card? Since when I have that option checked, the calibration part grayed out.