How much of that noise is below 20Hz? Home recording microphones can have stunningly high sub-sonic noise, and it can throw off noise measurements.
Koz
Noise Floor Woes/ Mastering for Audiobook Help!
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Please state which version of macOS you are using,
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This forum is for Audacity on macOS 10.4 and later.Please state which version of macOS you are using,
and the exact three-section version number of Audacity from "Audacity menu > About Audacity".
Audacity 1.2.x and 1.3.x are obsolete and no longer supported. If you still have those versions, please upgrade at https://www.audacityteam.org/download/.
The old forums for those versions are now closed, but you can still read the archives of the 1.2.x and 1.3.x forums.
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kozikowski
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