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Also I have recalibrate SPL when I rehook the real Mic up (comparing to a handheld SPL) and it doesn't have to be exactly 75db
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Well, you still need to use your SPL meter to set the 75dBSPL level in the room with your receiver (while holding it near the ECM8000)... and then you put that SPL meter away, and then set the input level into REW from the ECM8000......
bruek