RoomFit Moving Mic Measurement (beta) - improvements

[Shotgun Rico]

This is from Neumann MA-1 mic linearization page (link):

So I believe with REW you use the non-inverted file.

Ok but with RoomFit I use non-inverted one as well? I wasn’t planning on using REW. Thanks

 

[dominikz]

Ok but with RoomFit I use non-inverted one as well? I wasn’t planning on using REW. Thanks

Ah, I see what I missed there, sorry!
Yes, RoomFit and REW use the same kind of calibration files.

 

[Shotgun Rico]

Ah, I see what I missed there, sorry!
Yes, RoomFit and REW use the same kind of calibration files.

It’s all good! I will do some experimenting. Hopefully it goes smoothly Thanks lol I’ll post my results.

 

[EddNog]

...There is one potential problem, though - in my tests when MMM was enabled, RoomFit didn't apply any correction below 30Hh, even when lower bound of the correction range was set to 20Hz. Not sure if this is intentional (i.e. due to greater sensitivity of MMM to ambient noise compared to a sweep), or if it is a bug...

Is this still the case right now (start of Feb. 2026)? If so, I can't rely on this; my sub goes all the way down past 10Hz with room gain and normally I apply correction all the way down to 12.5Hz. I can probably get away with only correcting down to 20Hz, but that 20-30Hz band does need it for me!

-Ed

 

[EddNog]

I just pointed the mic towards the speakers. If you do point it upwards use the 90 degree cal file.

If correcting only 250Hz and down, does it really matter much if pointing forward with 0-degree calibration versus pointing up with 90-degree calibration?

-Ed

 

[canard]

except if you listen to a lot of symphonic , opera, or " big"acoustic music, or if room volume information is also present in these frequencies 20/30hz, you should still be aware that there isn't much below 30Hz. It might be fun to dedicate a subwoofer to frequencies below 35/40Hz, but if it's already handling everything above 40-45Hz, the poor subwoofers can already be under a lot of strain.
;-)

 

[Wiimer]

Is this still the case right now (start of Feb. 2026)? If so, I can't rely on this; my sub goes all the way down past 10Hz with room gain and normally I apply correction all the way down to 12.5Hz. I can probably get away with only correcting down to 20Hz, but that 20-30Hz band does need it for me!

-Ed

Please refer to @slartibartfast's post. (It has a 26Hz filter.)

S

Post in thread 'WiiM Home App v3.4.12 Update – Jan 26, 2026'

Friday at 4:28 AM

This could explain some of the differences you saw, I guess.
BTW, I'd say that most people aren't aware that you can configure PEQ attribute limits in REW to make it a better fit to WiiM PEQ implementation constraints.
Luckily, seems like @WiiM Team are considering requesting that WiiM PEQ profile be added to REW (link) which would help a lot with this, IMHO!

I repeated the measurements and this time REW gave me the expected flat response. I also made sure I moved the mic over an area centrally between the speakers. I made another WiiM variable measurement immediately...

• slartibartfast

• 

 

[dominikz]

Is this still the case right now (start of Feb. 2026)? If so, I can't rely on this; my sub goes all the way down past 10Hz with room gain and normally I apply correction all the way down to 12.5Hz. I can probably get away with only correcting down to 20Hz, but that 20-30Hz band does need it for me!

-Ed

It seems the issue in my case was caused by the fact that, due to a specific shape of the response, RoomFit seems to have assumed the response below 30Hz was caused by ambient noise (in reality it isn't). MMM is more sensitive to ambient noise, so it seems the algorithm is more careful about what it assumes is the actual response vs noise. But there appears to be no strict lower limit enforced by RoomFit.

In short, it may not be an issue at all in other environments. My ticket is still under analysis by WiiM.

If correcting only 250Hz and down, does it really matter much if pointing forward with 0-degree calibration versus pointing up with 90-degree calibration?

-Ed

The mic orientation doesn't matter much, no.
Have a look at this post and this post for some examples, and this post for a theoretical explanation.

 

[slartibartfast]

Is this still the case right now (start of Feb. 2026)? If so, I can't rely on this; my sub goes all the way down past 10Hz with room gain and normally I apply correction all the way down to 12.5Hz. I can probably get away with only correcting down to 20Hz, but that 20-30Hz band does need it for me!

-Ed

I see filters at 26Hz. I can't remember if I ever didn't.

 

[slartibartfast]

If correcting only 250Hz and down, does it really matter much if pointing forward with 0-degree calibration versus pointing up with 90-degree calibration?

-Ed

Probably not. I have started to point the mic up though. I also learned to not hold the mic body when doing MMM measurements. It's amazing how much low frequency garbage gets picked up when holding the mic body

 

[EddNog]

Probably not. I have started to point the mic up though. I also learned to not hold the mic body when doing MMM measurements. It's amazing how much low frequency garbage gets picked up when holding the mic body

Thanks; I have a mic boom/stand, so I will just be holding that with the mic at the far end, and I will stand way, way off to the side. Combining the length of the boom arm with the length of the feet extended, I can probably manage to be a full six feet away from the microphone assuming my arms can handle the weight/leverage. I feel as if it would be easier for me to pull off keeping the mic oriented upward than keeping it level/pointed straight forward.

-Ed

 

[dominikz]

Thanks; I have a mic boom/stand, so I will just be holding that with the mic at the far end, and I will stand way, way off to the side. Combining the length of the boom arm with the length of the feet extended, I can probably manage to be a full six feet away from the microphone assuming my arms can handle the weight/leverage. I feel as if it would be easier for me to pull off keeping the mic oriented upward than keeping it level/pointed straight forward.

-Ed

Upward mic orientation with the 90° cal file is a tiny bit more accurate at higher frequencies, so that's a plus (though largely irrelevant in practice).
And standing out of the way while holding the mic at the far end of a boom arm is ideal as you avoid any interference from your body.

Personally I just hold the mic at an arms length when doing room correction - with some care in execution the results can be very accurate so I don't bother with the boom arm anymore.

 

[canard]

Just a little reminder
;-)

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