Analyzing RoomFit correction results (KEF LSX II + Ultra)

[huyvoxyz]

Hello everyone,

I've been experimenting with RoomFit to correct the low-frequency issues in my room using my KEF LSX II speakers (with their internal EQ disabled) connected to a WiiM Ultra via optical cable. I don't use sub.

I ran three Individual Channel RoomFit sessions and would appreciate the community's analysis and comparison, as I'm not entirely confident in my RoomFit settings and in reading the results graphs and selecting the best profile.

RoomFit configuration:
- Type: Individual Channel RoomFit (my speakers are not placed in center of the room, the left is near the corner and wall layout behind them is also different)
- B&K target curve
- Min-max gain: -12 dB and +6 dB, https://faq.wiimhome.com/en/support/solutions/articles/72000647399 recommends max gain +3 dB but someone on this forum suggested +6 dB when used with non-boost mode, so I followed that
- Max Q: 10
- Non-boost mode: enabled
- Built-in mic compensation: enabled
- Smoothing: 1/12 octave
- Multiple measurements: enabled

First session (individual400Hz): target frequency is 50-400Hz
Second session (individual400Hz-2): same freq with first session
Third session (individual500Hz): target frequency is 50-500Hz

I am very new to this subject, and any advice is welcomed!

1. 400Hz vs 500Hz range: I am confused about the ideal correction limit. Some advice points to 400Hz as the maximum range for reliable room correction, while others suggest 500Hz is safe for low-frequency room mode correction. Which cutoff is technically more appropriate for this purpose?
2. How successful was Roomfit in correcting the Hz across all profiles? (I can't say which cyan curve is better than which)
3. Will an external microphone improve further the correction? I've been using the iphone 13 mic at 3 am for absolute silence lol

Thank you in advance!

 

[dominikz]

I ran a few multi-mic measurements at different times of the day and got mixed results. Profile 2 seems to be the worst, but I’m stuck between 1 and 3.

Profile 1
View attachment 32476

Profile 2
View attachment 32477

Profile 3
View attachment 32478

Honestly, I’m a bit lost on how to read these graphs. Should I be focusing on the cyan curve or the pink one? Does the cyan line shift every time I measure? Basically, should I just be looking at the pink curve to judge how well the bass is actually being handled?

Cyan curve tells you how the corrected loudspeaker response looks, so best to focus on that one.

Anyway, all 3 profiles look pretty similar to me, so I'd say any one of them should be fine.
Did you change anything between them, or are these just 3 attempts made with the same configuration and under the same conditions?

 

[huyvoxyz]

Cyan curve tells you how the corrected loudspeaker response looks, so best to focus on that one.

Anyway, all 3 profiles look pretty similar to me, so I'd say any one of them should be fine.
Did you change anything between them, or are these just 3 attempts made with the same configuration and under the same conditions?

The only difference was using line out for the first run, then switching to optical out for the second and third, but I don't think it should change anything? And with MMM, the way I move the phone is different each time, so that probably explains it.

 

[slartibartfast]

The only difference was using line out for the first run, then switching to optical out for the second and third, but I don't think it should change anything? And with MMM, the way I move the phone is different each time, so that probably explains it.

You didn't say you were using MMM. You said you were using multiple measurements which is different.

 

[dominikz]

The only difference was using line out for the first run, then switching to optical out for the second and third, but I don't think it should change anything? And with MMM, the way I move the phone is different each time, so that probably explains it.

Note that MMM is sensitive to environment noise (e.g. like fridge hum, or a truck passing by on the street outside your house).
This means that the response shape you measure with MMM can change as the noise changes, assuming noise level is sufficiently high to pollute the measurement.

Sweep measurements are much more resistant to environment noise.

Both sweep and MMM should give similar results at low frequencies (e.g. below 300Hz), but they will be different at higher frequencies.
Since we only apply RoomFit correction at low frequencies, either method (MMM or sweep) works well enough.