Here's a quick blurb from the 950's manual (page 27) that might get you started.
Set the meter to Slow response and “C” weighting. Set it to the 70 or 80dB sensitivity scale. Position the meter at the approximate center of your listening area, at average ear height [approximately 40-46 inches (102-117 cm)] with its microphone positioned vertically (pointing at the ceiling). Don’t aim the microphone at the speakers, as this will produce inaccurate results.
Once that's all done, set your system volume to a reference listening level (on the 950, that's "00" dB, but other gear will vary -- you might use a test tone on the left or right channel and set the system volume to a point where you get ~75dB). Then run through the test tones and adjust each channel's trim to produce the same reading.
There are also a few threads floating around that look at meter use pretty closely, including a
lengthy debate on the merits of meters at all . (Upon briefly re-reading that thread, I had a flashback to my Experimental Techniques II lab in college, and a crazy professor who insisted that proper uncertainty analysis was foolish and that anyone could measure to within 1/64 of an inch with a ruler marked in divisions of 1/8th of an inch. He also swore that he could draw a "perfect" circle or straight line freehand. We were
so glad to see him retire.)
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