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· Premium Member
15,060 Posts
Hi Mark, Welcome to the Shack,

The reason is because a calibration file needs to be made for each and every mic used with REW and as both the Galaxy140 and the Radio Shack are by far the most common SPL meters with a line out these were the only files made other than the ECM8000 (you still need an SPL meter if you use the ECM).
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