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I meant a Behringer 8000 "microphone"... thought it was so commonly used for analysis that more words were unnecessary.
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Ahh OK, my bad. Yeah, the ECM8000 is used for measuring, while the SPL meter in that case would be used only once during calibration of the SPL level setting at the listening position. The Check Levels routine is started and your receiver is adjusted to output 75dB at the listening position. This 75dB is set using the Radio Shack meter (handheld or whatever) without any connections - then the meter is put away. Then while still running Check Levels, the ECM8000's preamp and laptops soundcards input level controls are set to appease REW. Then the REW SPL meter is adjusted to match the 75dB (by running Calibrate SPL routine), thereby calibrating REW to track an actual SPL level set with the RS meter.
All that verbiage takes 100 times longer to write down than actually do the job...
brucek