AVS Forum Special Member
Join Date: Mar 2004
Location: Cleveland, Ohio
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An SPL meter is best used to set the individual channel levels. I would mount it on a tripod or mic stand at the main listener's seat and aim it straight up.
For frequency response checks I would use a calibration mic.
The Radio Shack SPL meter correction charts are about worthless. These mics have been manufactured for decades, probably in different factories with many different suppliers for all the internal parts. From batch to batch the frequency response is all over the map.
I'll let others answer your other questions.