Audiotool shows 91dB instead of 94dB using calibrated microphone

[János Zöldi-Kovács]

I've a UMIK-2 microphone connected to Android phone, using Dayton-formatted cal.file (see enclosed). Using a Bruel microphone calibrator it shows 91dB instead of 94dB. Using the same microphone with REW the value exactly 94dB. A TES1351 SPL meter shows also 94dB.
What is the problem, what is the solution?

[Julian Bunn]

Go to the AudioTool Menu and add a Global Offset of 3dB. That should fix it.

On Mon, Nov 18, 2024 at 12:11 PM János Zöldi-Kovács <zkj...@gmail.com> wrote:

I've a UMIK-2 microphone connected to Android phone, using Dayton-formatted cal.file (see enclosed). Using a Bruel microphone calibrator it shows 91dB instead of 94dB. Using the same microphone with REW the value exactly 94dB. A TES1351 SPL meter shows also 94dB.
What is the problem, what is the solution?

--
You received this message because you are subscribed to the Google Groups "AudioTool Discussion Group" group.
To unsubscribe from this group and stop receiving emails from it, send an email to audiotool-discussio...@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/audiotool-discussion-group/343111d8-9861-4d86-8f2b-97b7dfb537f1n%40googlegroups.com.

[János Zöldi-Kovács]

Hi Julian!

Thank you! Is it a normal behaviour?

Best Regards:

János Zöldi-Kovács

[Julian Bunn]

The cal file you sent shows corrections ranging from -5dB at the low end to -3dB at the high end. Those numbers do seem unusually high - I'm used to seeing calibration corrections in the fractions of a dB.

Julian

[János Zöldi-Kovács]

Hi Julian!

The cal file was downloaded from Minidsp support site, only the first line's format was modified. This is why I'm wondering about teh 3dB difference. It looks like a difference between a peak and RMS value (sine wave).

My best regards:

ZKJ