Different results of room correction on iOS and Android

[Vladetz]

Hello all
I have noticed that i get absolutely different results of measurements and room correction on 2 devices: iPad Air (2022) and Poco X6 Pro
Results from iPad are very close to REW, but Poco is a way off
I am using Dayton iMM-6C with calibration file in all cases, position, volume level and all possible settings are the same
Pictures 1-3 - iPad, 4-6 - Poco, REW without EQ - 7
FDW is disabled
OS and app versions are latest

Setup: Wiim Ultra - Topping E70 Velvet - Topping PA7 - Mission

 

[WiiM Support]

Hello all
I have noticed that i get absolutely different results of measurements and room correction on 2 devices: iPad Air (2022) and Poco X6 Pro
Results from iPad are very close to REW, but Poco is a way off
I am using Dayton iMM-6C with calibration file in all cases, position, volume level and all possible settings are the same
Pictures 1-3 - iPad, 4-6 - Poco, REW without EQ - 7
FDW is disabled
OS and app versions are latest

Setup: Wiim Ultra - Topping E70 Velvet - Topping PA7 - Mission

Hi Vladetz,

Please send us a ticket using the WiiM Home App. We'll troubleshoot this for you immediately. Thank you!

 

[slartibartfast]

Hello all
I have noticed that i get absolutely different results of measurements and room correction on 2 devices: iPad Air (2022) and Poco X6 Pro
Results from iPad are very close to REW, but Poco is a way off
I am using Dayton iMM-6C with calibration file in all cases, position, volume level and all possible settings are the same
Pictures 1-3 - iPad, 4-6 - Poco, REW without EQ - 7
FDW is disabled
OS and app versions are latest

Setup: Wiim Ultra - Topping E70 Velvet - Topping PA7 - Mission

What do you see if you check the room correction results from the Poco with REW?

 

[Vladetz]

What do you see if you check the room correction results from the Poco with REW?

Have not checked, but here are results with iPad EQ
Also bass level (200hz and lower) is a bit lower than it should be because mic was moved a bit forward compared to main listetning position

 

[Wiimer]

Hello all
I have noticed that i get absolutely different results of measurements and room correction on 2 devices: iPad Air (2022) and Poco X6 Pro
Results from iPad are very close to REW, but Poco is a way off
I am using Dayton iMM-6C with calibration file in all cases, position, volume level and all possible settings are the same
Pictures 1-3 - iPad, 4-6 - Poco, REW without EQ - 7
FDW is disabled
OS and app versions are latest

Setup: Wiim Ultra - Topping E70 Velvet - Topping PA7 - Mission

In my opinion, there is a issue with the Xiaomi phone. This is a test I have done before.

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

May 19, 2024

Now, this is the results of the measurements on 5 Android devices again using the USB extension cable.
(Image size was adjusted for comparison.)

LG V60


Xiaomi 13T pro


Xiaomi 12T pro


Xiaomi pad 6


Galaxy tab s8+



Compare the LG V60 with other devices overlaid.

LG V60 / Xiaomi 12T pro


LG V60 / Xiaomi 13T pro


LG V60 / Xiaomi pad 6


LG V60 / Galaxy tab S8+



LG V60, Xiaomi pad 6, Galaxy tab S8+,
The measurements of these 3 phones were almost identical; let's compare the two...

• Wiimer

The Xiaomi 12T pro and 13T pro have reduced bass compared to other Android devices. The 13T pro is especially bad.

It may be due to the MediaTek chip, but I honestly not sure.. (12T pro is SD chip.)

 

[Vladetz]

In my opinion, there is a issue with the Xiaomi phone. This is a test I have done before.

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

May 19, 2024

Now, this is the results of the measurements on 5 Android devices again using the USB extension cable.
(Image size was adjusted for comparison.)

LG V60


Xiaomi 13T pro


Xiaomi 12T pro


Xiaomi pad 6


Galaxy tab s8+



Compare the LG V60 with other devices overlaid.

LG V60 / Xiaomi 12T pro


LG V60 / Xiaomi 13T pro


LG V60 / Xiaomi pad 6


LG V60 / Galaxy tab S8+



LG V60, Xiaomi pad 6, Galaxy tab S8+,
The measurements of these 3 phones were almost identical; let's compare the two...

• Wiimer

The Xiaomi 12T pro and 13T pro have reduced bass compared to other Android devices. The 13T pro is especially bad.

It may be due to the MediaTek chip, but I honestly not sure.. (12T pro is SD chip.)

It seems very plausible that Xiaomi/Poco/Redmi somehow reduce measured bass

 

[Wiimer]

It seems very plausible that Xiaomi/Poco/Redmi somehow reduce measured bass

Yes, but not all models seem to have the problem.
At least the Xiaomi pad does not have roll off.

Also, I remember @harkpabst once saying his Xiaomi phone (maybe Xiaomi 14) was fine.

 

[Vladetz]

It makes me think that many wiim users might be using not correct eq unknowingly
Even calibrated USB mic doesn't give confidence...

 

[dominikz]

It makes me think that many wiim users might be using not correct eq unknowingly

I am quite certain this is the case, yes.
And this is unfortunate because properly implemented room EQ can bring significant sound quality improvements.

It is why it would be perfect if WiiM Voice Remote microphone could be used by the RC to measure the response - the mic would then be a known quantity and could be pre-calibrated by WiiM.
@WiiM Support Is this under consideration, by any chance?

 

[canard]

I am quite certain this is the case, yes.
And this is unfortunate because properly implemented room EQ can bring significant sound quality improvements.

It is why it would be perfect if WiiM Voice Remote microphone could be used by the RC to measure the response - the mic would then be a known quantity and could be pre-calibrated by WiiM.
@WiiM Support Is this under consideration, by any chance?

It was discussed even before the arrival of the RC mode...never received any feedback from the team on the feasibility or not....maybe the quality of audio processing at this level is very far from the needs here in RC...etc
no dialog etc..

 

[slartibartfast]

I am quite certain this is the case, yes.
And this is unfortunate because properly implemented room EQ can bring significant sound quality improvements.

It is why it would be perfect if WiiM Voice Remote microphone could be used by the RC to measure the response - the mic would then be a known quantity and could be pre-calibrated by WiiM.
@WiiM Support Is this under consideration, by any chance?

Any idea why USB mics are affected? You wouldn't expect them to be.

 

[dominikz]

Any idea why USB mics are affected? You wouldn't expect them to be.

We have no idea what the phone is doing on SW side, unfortunately.
Perhaps there's an aggressive high-pass filter to pre-emtively remove rumble from recordings, and that applies to externally connected mics as well?

 

[WiiM Support]

I am quite certain this is the case, yes.
And this is unfortunate because properly implemented room EQ can bring significant sound quality improvements.

It is why it would be perfect if WiiM Voice Remote microphone could be used by the RC to measure the response - the mic would then be a known quantity and could be pre-calibrated by WiiM.
@WiiM Support Is this under consideration, by any chance?

Hi dominikz, team

Our team is currently evaluating both the feasibility and performance of this solution. Stay tuned—we’ll share updates soon!

 

[slartibartfast]

Hi dominikz, team

Our team is currently evaluating both the feasibility and performance of this solution. Stay tuned—we’ll share updates soon!

Are you also investigating the feasibility of using the remote mic for synchronisation of the subwoofer and main speakers? The current method doesn't work unless the WiiM device is in your listening position.

 

[canard]

Are you also investigating the feasibility of using the remote mic for synchronisation of the subwoofer and main speakers? The current method doesn't work unless the WiiM device is in your listening position.

 

[dominikz]

Hi dominikz, team

Our team is currently evaluating both the feasibility and performance of this solution. Stay tuned—we’ll share updates soon!

That's great to hear!

While an external calibrated measurement mic should normally give the best RC results, being able to use the WiiM Voice Remote would give a reliable alternative for people who don't own a calibrated measurement microphone. Or in irregular cases like from post #1 where a phone seems to be invoking some kind of processing function on audio input so even a calibrated external microphone doesn't seem to help.

 

[Wiimer]

Tested again.

Measurements were taken on a subwoofer connected to the Pro.
In the WiiM RC, only the Xiaomi 13T is still unusual.










I tried turning off noise reduction in the 13T phone app. However, the result is the same.







I then tried the Audio Tool app.
All phones were put in Airplane mode and the app settings were standardised.
IMM-6C is calibrated.

Again, the 13T has up to 5 dB less low frequency.










Sound Analyser Pro was then tested under the same conditions.
(No calibrated)

Curiously, no anomalies are found here on the 13T pro.











This may be a problem that can be addressed on the WiiM app side, as the results may vary depending on the app used.

@WiiM Support, @WiiM Team,
Would it be possible to obtain a Xiaomi phone to investigate?
(But if you plan to move fully to measuring using a remote, this may not be necessary.)




The IMM-6C was fixed and I operated it from the next room.


My dog was unusually quiet today.

 

[Vladetz]

fixed

Very nice construction of mic handle
Thank for your tests
Maybe Sound Analyser Pro uses some kind of exclusive usb audio mode to bypass android audio mixer?

 

[dominikz]

(But if you plan to move fully to measuring using a remote, this may not be necessary.)

IMHO, even if the WiiM Voice Remote mic can be used in the future, using an external measurement microphone should still be preferred as it will definitely result in more precise measurements.
So if there is a general way to ensure bypassing phone-internal processing of audio input in Android that should definitely be investigated.

BTW - great analysis, thanks for taking the time to do and share these measurements!

 

[Wiimer]

Thanks.
I have looked into the Xiaomi phone and there doesn't seem to be anything the user can do about it; Gemini says it is likely that there is a noise cancelling filter working inside the phone, but they don't seem confident.

Although there are reports that may be relevant...

Microphone / Noise cancellation issue in call

Recently bought a Mi Note 10, we have a problem with the noise cancellation in Calls, and Voip apps like What's app and Zoom. Testing the mic in CIT is fine, and recording in Videos is ok, but in calls I find the noise cancellation filters out a lot of frequencies. e.g. trying to play Piano...

xiaomi.eu

IMHO, even if the WiiM Voice Remote mic can be used in the future, using an external measurement microphone should still be preferred as it will definitely result in more precise measurements.

The 2nd remote may have an ultra-high-performance mic .
But yes, I agree .