Why not integrate the .cal file with the AudioTool software so its automatically configured?

[Mark Schrader]

It appears this would save you a lot of valuable time & effort.

[pa sk]

What do you mean by "integrate the .cal file with the AudioTool"?

[Mark David]

So no one has to manually find & change the cal file. This should be automatic. Why should anyone be required to do this in order for this app to work ?

Do you understand where I'm coming from now? Perhaps someone else can better clarify  this for me or explain better?

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[pa sk]

hm, assume you have a1.cal, a2.cal, etc.

think about having .cal file and not wanting to use it

methinks that some better UI might do the job; but automation? i'd better leave thinking to my head than to software

[pa sk]

and besides, the phrase " integrate the .cal file with the AudioTool software so its automatically configured"  is ambiguous (at least three different meanings, in this context)

so thank you for clarification :)

[pa sk]

Why should anyone be required to do this in order for this app to work ?

You do not have to load calibration file to use AudioTool, it will work perfectly without it, only the measurements will be less acurate

However, from my experience with Dayton iMM-6 and its calibration file, the one-point calibration (offset) gives decent results, and considering the unpredicted behaviour of phones' preamps it might even become an overkill to use any calibration

and I am not talking about only the simple static frequency response of preamps - if it was only this then we'd be in heaven ;)

dynamic behaviour is far more devastating, you know

so far I've had only one phone (checked 6 in total) which had purely linear gain and its noise up to 4 kHz were simply 1/f noise - for this one the calibration was really justified

wish you luck in setting up your AudioTool :)

[Mark Schrader]

I'm trying to figure out why my Motorola G7 android phone does not see the cal file? It saw it before on other android phone before it died. What do you recommend I name it? Yes I do want accurate readings. I assumed it was not working because the cal file would not load.

Any tips? I do appreciate what this app can do for my 7.1 home theater system. It enable me to tune the 10 band equalizer within my Asus sound card. It made a noticeable improvement.

[pa sk]

the name of .cal file doesn't matter, at least sth like you see on the attached screenshot work as they should

what's important are the location (\audiotool\) and the internal structure of the file

[pa sk]

ufff, sorry for that huge image - i dodn't know it'd look like this ...

[Mark Schrader]

Thank you, I really appreciate this. Does the cal file really make a difference for the android version AudioTool? If not I won't bother with it. I was originally under the impression that I would generate unreliable readings if I did not include the cal file when using the Dayton imm-6 mic for audio calibration.

[pa sk]

it very much depends on a particular phone model, e.g. motorola edge+ is a crap if it comes to audio path and you may very well forget about the original .cal file from Dayton Audio - you have to construct your own one

I don't know how G7 behaves

have you got access to some audio calibrator and sound level meter or at least to the latter?

[pa sk]

you know, you have to make few assumptions and the most tricky is the faith that your phone has linear gain, not much affected by various DSPs inside the phone

not having the sound level meter all the measurements you can do will be relative measurements - you will not measure the absolute sound level

but it's OK for your task (setting the audio system, right?)

however, one thing you have to know - the freq response of mike + phone audio path

the response of the mike you already know - it's in the .cal file

the response of your phone is a mystery - you can try to approximate it with two methods:

 1. short the mike input of the phone and observe the full spectrum measurement, the best for the highest resolution and "slow" detector

 2. connect the iMM-6 and in some very quiet environment observe the same as above

or you can do both

if in both cases you get the spectrum of a pink noise, or at least a decent approximation (+/- 2 dB) you're a lucky man:

try this at the beginning :)

btw 1, about the file name - remove any spaces or any weird characters from it, use only letters and numbers

btw 2, have you checked the internal structure of a file?