[IMM-6 vs IMM-6C] Comparison of measure mic for Android 10PEQ(RC)

[Wiimer]

Well, isnt it about time to go through REW with your laptop and those mics?

You're right, but I don't want to use my PC for private use anymore , I have a 10 year old ASUS VivoMini, but I don't know if I can run REW on it...

But thanks for the advice though. I may give it a try when if one is in a mood.

 

[wiimj]

You're right, but I don't want to use my PC for private use anymore , I have a 10 year old ASUS VivoMini, but I don't know if I can run REW on it...

But thanks for the advice though. I may give it a try when if one is in a mood.

Good luck! It took me a few hours to learn (of course, for the simple purpose of RC only).

 

[Wiimer]

I pulled an old laptop out of storage and measured it with REW.


(Red line = REW)


I used REW for the first time today, so I took the measurements almost with the default settings, and the error between the two measurements could be due to differences in the settings.

But I am satisfied with the result.

My personal conclusion: I think the Android +IMM-6C is a good enough measurement tool for my home audio.

Note that I could not compare the IMM-6 because I do not have a 4-pole 3.5mm extension cable...


Extra.
I also compared the IMM-6C with another USB-C microphone (BOYA BY-P4U) I have. BOYA is not as bad as I thought.




IMM-6C (REW) vs BOYA (Android)



[Warning]
The phone's built-in microphone sometimes did not turn off when using the extension cable. This was fixed by plugging the cable in the opposite direction or restarting the app.

 

[mattzildjian]

I just received an IMM6C and noticed that it doesnt seem to work properly with my current android phone, but seems to be fine on my old android phone. Very frustrating! Here's a comparison of measuring pink noise with Spectroid.

Old Phone (Poco F2 Pro)


Current Phone (Poco F6 Pro)


Very odd, the low end response falls off a cliff when using my current phone, I really have no idea why. I know this isn't right because my system is bass heavy and it was calibrated with SoundID Reference and the measurement mic that comes with.

Anyone have any ideas what might be going on here? Both apps are using the same settings. Interestingly if I just gently tap the microphone I would expect to see a somewhat smooth response in the low end and that happens with my old phone but again, not with my current phone, here is another comparison.

Old Phone (Poco F2 Pro)
Gently Tapping the microphone


Current Phone (Poco F6 Pro)
Gently Tapping the microphone


Here you can see that same odd behaviour in the low frequencies that is seen from the real world measurement. It's almost like the mic is being sent insufficient power through the usbc or something.

 

[Wiimer]

I just received an IMM6C and noticed that it doesnt seem to work properly with my current android phone, but seems to be fine on my old android phone. Very frustrating! Here's a comparison of measuring pink noise with Spectroid.

Old Phone (Poco F2 Pro)
View attachment 18729

Current Phone (Poco F6 Pro)
View attachment 18730

Very odd, the low end response falls off a cliff when using my current phone, I really have no idea why. I know this isn't right because my system is bass heavy and it was calibrated with SoundID Reference and the measurement mic that comes with.

Anyone have any ideas what might be going on here? Both apps are using the same settings. Interestingly if I just gently tap the microphone I would expect to see a somewhat smooth response in the low end and that happens with my old phone but again, not with my current phone, here is another comparison.

Old Phone (Poco F2 Pro)
Gently Tapping the microphone
View attachment 18734

Current Phone (Poco F6 Pro)
Gently Tapping the microphone
View attachment 18735

Here you can see that same odd behaviour in the low frequencies that is seen from the real world measurement. It's almost like the mic is being sent insufficient power through the usbc or something.

I am not sure, but it looks like the IMM-6C is not being recognized, please try connecting the USB adapter of the IMM-6C in the opposite direction. Also try changing the audio source in the audio settings of the app. Also reboot the phone.

I had the same thing happen before with my phone, but now all phones recognize the mic. unplugging and plugging the IMM-6C a few times while the app is running in the foreground may solve the problem.

 

[Saponetto]

Hi @Wiimer,
just got a Boya BY-P4U previously used for office conferencing.
Do you think is it an overall useable external mike if I would tinker with Ultra&Pro+ room correction?

 

[Wiimer]

Hi @Wiimer,
just got a Boya BY-P4U previously used for office conferencing.
Do you think is it an overall useable external mike if I would tinker with Ultra&Pro+ room correction?

Hi,

The WiiM RC recognizes the BY-P4U as USB audio, so it can be used. Note, however, that as the graph shows, the sensitivity is lower at lower frequencies, so the RC may boost the bass.

 

[Saponetto]

Thanks for your kind answer, considering that any RC I could try to apply will be limited within 300Hz, I'll give it anyway a try!

 

[slartibartfast]

Thanks for your kind answer, considering that any RC I could try to apply will be limited within 300Hz, I'll give it anyway a try!

Below 300 Hz is where you will see the issue though.

 

[Saponetto]

My thought is that if I do not have need of comparing sensitivity with frequencies above 300 Hz should be feasible anyway.
Of course if there is evident non-linearity within 300Hz I'll ditch it.

 

[slartibartfast]

My thought is that if I do not have need of comparing sensitivity with frequencies above 300 Hz should be feasible anyway.
Of course if there is evident non-linearity within 300Hz I'll ditch it.

Maybe someone can make a calibration file for it by comparison with a calibrated microphone Even if you limit the correction to less than 300Hz the algorithm will still look at the whole frequency range to find the target level.

 

[Wiimer]

My thought is that if I do not have need of comparing sensitivity with frequencies above 300 Hz should be feasible anyway.
Of course if there is evident non-linearity within 300Hz I'll ditch it.

I used to use the BOYA mic and my ears to find the bass peaks in the room, and correct them with PEQ, speakers and listening positions .

 

[Saponetto]

@Wiimer
Perhaps this is the best approach, find and correct.