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I didn't even think about using my phone. But yeah, can't imagine mics tuned for voice are going to do well with boomy music.
They have same opinion I had about phone mics.
Use https://www.roomeqwizard.com/ with a calibrated mic.
Anyone know anything about Omnitronic mics? They have a calibrated offering like Umik for half the price. MM2-USB
https://www.avnirvana.com/threads/omnitronic-mm-2usb-mic.3630/
"I've measured several 1/4" electret capsules and I don't believe that specs. They claim it's pressure gradient and omnidirectional... it's a shame."
hippy-
Have you tried using a frequency generator to identify the frequency? You should be able to hear it when it peaks.
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https://www.avforums.com/threads/minidsp-umik-1-to-borrow-hire.2442900/
This guy rents his out for £15/month
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Behringer does a cheap one, few others in the same price bracket as well. See e.g.
https://www.thomann.de/gb/microphones_for_measurements.html
Note that you'll probably need a mic pre-amp with phantom power for these.
Dogs
danb
paradroid
You might find that decoupling makes the difference as if they're coupled the surface they're on will act as a baffle.
I'm sure there's an app but I'm not sure how well your phones mic will deal with the bottom end.