The iPhone dB meters are of no value. I have a couple of those on my iPhone and they don't correlate at all with my REAL, true blue dyed in the wool, AudioControl RTA/dB meter.
For $2.99 you are getting what you paid for.
Maybe if you have a real, calibrated meter that you can compare with an iTunes/iPhone meter you can make some comparisons.
Last edited by GaryProtein; 10-30-2017 at 12:31 AM.
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