I imagine that different brand receivers must be adjusted differently than others. My Yamaha will not let me use the DVD to adjust the volume settings (using the spl meter). I have to use the pink noise emitted by the receiver, not the dvd.
I have to use the volume control to set my main speakers to the 75 db setting, but to set the surrounds and center speakers so they will adjust to the 75 db setting, I have to go into the receiver settings via the remote and then set the affects speakers (surrounds, center) individually using a different button control than the volume.
So, I would suggest reading the receiver manual to first learn how to adjust the different speakers, then, use the spl meter with that method to get the db settings all the same.