RoomFit Moving Mic Measurement (beta) - improvements

[slartibartfast]

These were recent, yes, taken on the day I posted them. So far I don't believe I had a case where the response deviated from expectation when I remeasured in REW.

I have sent feedback but couldn't include all the images I intended to as the limit is 5. Let's see what happens next. The evaluation results from the WiiM app differ when sweep or Pink noise is used with the sweep being more similar to REW.

MMM pink noise


Sweep

 

[dominikz]

I have sent feedback but couldn't include all the images I intended to as the limit is 5. Let's see what happens next. The evaluation results from the WiiM app differ when sweep or Pink noise is used with the sweep being more similar to REW.

MMM pink noise
View attachment 31943

Sweep
View attachment 31944

Very surprising results, interested to hear what @WiiM Support say.

Usually MMM and sweep look almost identical below about 200Hz.

Except of course if there's any low-frequency ambient noise - sweep is resistent to that, but MMM isn't - so ambient noise can cause unexpected peaks in the MMM response.

 

[slartibartfast]

Very surprising results, interested to hear what @WiiM Support say.

Usually MMM and sweep look almost identical below about 200Hz.

Except of course if there's any low-frequency ambient noise - sweep is resistent to that, but MMM isn't - so ambient noise can cause unexpected peaks in the MMM response.

The mmm WiiM evaluation is consistently incorrect compared to the sweep evaluation from WiiM and both sweep and mmm results from REW. I wish you saw the same thing

 

[Wiimer]

The mmm WiiM evaluation is consistently incorrect compared to the sweep evaluation from WiiM and both sweep and mmm results from REW. I wish you saw the same thing

I verified whether I could reproduce your issue.

I fixed IMM-6C and ran RoomFit (25–300 Hz, L/R, MMM). I then evaluated the saved profile using pink noise and a sweep.

Pinknoise


Sweep


The results match, but is my approach incorrect?

 

[slartibartfast]

I verified whether I could reproduce your issue.

I fixed IMM-6C and ran RoomFit (25–300 Hz, L/R, MMM). I then evaluated the saved profile using pink noise and a sweep.

Pinknoise
View attachment 31959

Sweep
View attachment 31960

The results match, but is my approach incorrect?

That is what I would expect. Can you also check the response in REW? You saw my two completely different evaluation results.

 

[Wiimer]

That is what I would expect. Can you also check the response in REW? You saw my two completely different evaluation results.

I still don't know how to use REW sorry.
Would an Android analyzer app be okay?

 

[slartibartfast]

I still don't know how to use REW sorry.
Would an Android analyzer app be okay?

Yes indeed an Android app would be fine.

 

[Wiimer]

Yes indeed an Android app would be fine.

I performed evaluations using pink noise and sweep with the RoomFit profile I created earlier, and measured the results using the Android app (Sound Analyzer Pro).





No noticeable difference is found below 80Hz.

 

[Newzpix]

Is there an advantage to scanning the left spraker without the right, and then the right without the left? Just a transient thought.

 

[dominikz]

Is there an advantage to scanning the left spraker without the right, and then the right without the left? Just a transient thought.

This is what the "Individual Channel RoomFit" variant does.
It allows one to optimize the response of each channel, and usually translates well to the combined (L+R) response as well.

 

[slartibartfast]

I performed evaluations using pink noise and sweep with the RoomFit profile I created earlier, and measured the results using the Android app (Sound Analyzer Pro).

View attachment 31961

View attachment 31962

No noticeable difference is found below 80Hz.

Just me then. I wonder now when this started happening since I haven't checked the output with REW for a long time. I'm using a WiiM Amp. Which devices are you and @dominikz using?

 

[dominikz]

Just me then. I wonder now when this started happening since I haven't checked the output with REW for a long time. I'm using a WiiM Amp. Which devices are you and @dominikz using?

Currently I'm using WiiM Amp Ultra, WiiM Mini and a WiiM Sound. Haven't noticed this issue on any of those.

 

[slartibartfast]

Currently I'm using WiiM Amp Ultra, WiiM Mini and a WiiM Sound. Haven't noticed this issue on any of those.

Could be an Amp issue then. If even the WiiM sweep.amd pink noise evaluations don't agree there must be something wrong.

 

[Wiimer]

Just me then. I wonder now when this started happening since I haven't checked the output with REW for a long time. I'm using a WiiM Amp. Which devices are you and @dominikz using?

I tested it on the Amp Ultra. Has the latest firmware for the Amp already been delivered to you?

 

[slartibartfast]

No

I tested it on the Amp Ultra. Has the latest firmware for the Amp already been delivered to you?

No still waiting since Christmas Eve
@WiiM Support @WiiM Team @RyanWithWiiM Any news on the WiiM Amp firmware update from December 24th?

 

[Newzpix]

This is what the "Individual Channel RoomFit" variant does.
It allows one to optimize the response of each channel, and usually translates well to the combined (L+R) response as well.

Thanks, what mean is "turn off" the opposite speaker during the sweep.

 

[slartibartfast]

Thanks, what mean is "turn off" the opposite speaker during the sweep.

That is what individual channel correction does. There are two sweeps, first left then right.

 

[dominikz]

Thanks, what mean is "turn off" the opposite speaker during the sweep.

As @slartibartfast said, "Individual Channel RoomFit" already covers that case for the calibration step.

In case you are referring to the evaluation step (which always uses combined L+R measurement signal), then a potentially easier way (than physically disconnecting speakers) may be to use the L/R balance slider prior to evaluation - but note that in that case you need to do two separate evaluations to measure both channels.

 

[slartibartfast]

Very surprising results, interested to hear what @WiiM Support say.

Usually MMM and sweep look almost identical below about 200Hz.

Except of course if there's any low-frequency ambient noise - sweep is resistent to that, but MMM isn't - so ambient noise can cause unexpected peaks in the MMM response.

Well I got a response. Not sure what to think about it. I included evaluation results for sweep and mmm which were clearly different using the same RoomFit filters and REW results showing the correction wasn't working correctly. EQ settings should be fine but they clearly are not

"Our engineers have reviewed the issue, and the EQ settings should be fine.
It’s normal for actual measurement results and predicted results to differ slightly. If there’s a significant difference, we recommend checking if the EQ in REW matches the one imported into the WiiM.
Please upload the measurement results from both WiiM mmm/sweep and REW mmm/sweep for comparison.
To minimize measurement errors, we suggest keeping the microphone stationary during the mmm measurement, aligned with the direction of the sweep measurement."

 

[dominikz]

Well I got a response. Not sure what to think about it. I included evaluation results for sweep and mmm which were clearly different using the same RoomFit filters and REW results showing the correction wasn't working correctly. EQ settings should be fine but they clearly are not

"Our engineers have reviewed the issue, and the EQ settings should be fine.
It’s normal for actual measurement results and predicted results to differ slightly. If there’s a significant difference, we recommend checking if the EQ in REW matches the one imported into the WiiM.
Please upload the measurement results from both WiiM mmm/sweep and REW mmm/sweep for comparison.
To minimize measurement errors, we suggest keeping the microphone stationary during the mmm measurement, aligned with the direction of the sweep measurement."

I guess they just want to reduce the number of variables to see if that helps pin-point the cause of the issue you are seeing.

"It’s normal for actual measurement results and predicted results to differ slightly."

Regarding this part of their response - I agree that some small variability is expected, but not the amount you saw in your measurements.
In my experience the match between predicted and actual responses is generally very good (in both RoomFit and REW).