Borrow a tripod if you can. If you can't, use blocks or books to create a tower that gets the thing a) to ear level from the usual best/preferred listening positon, b) isolated from side walls and obstructions, at least to the degree your head is when listening.
If you get the thing on a tripod (or some facsimile thereof), you'll be amazed to see how slight obstructions, such as the placement of your body relative to the meter and speakers, changes the calibration volumes. To really balance the side-to-side volume and match the center to the front mains correctly, a tripod is best.
Birdman
