High resolution audio spectrum analysis, frequency range within 20-20k HzYou use build-in mic to collect audio data or "TRRS 3.5 Jack to Mic and Speaker" adapter to connect audio sourceExample usage:1.
As a reference for tuning equalizer2.
Testing frequency response of speaker
https://andro.io/app/extrahz
Power 100
Android app profile
Extra Hz for Android – Latest Version & Features
by Extra Chan
★★★★★
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> 2.2k
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~$900
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