Room Mode + Speaker Anechoic Measurement Correction

[cristoo]

And I moved sub from the corner towards left speaker like it was before and little bit far from back wall like 20-30 cm.



All seetings the same

 

[lempogi]

Perhaps you'll be interested to try this - today I wanted to see if there's any way to workaround the current limitation of RoomFit where we target level isn't set optimally due to the fact that the correcting range is also used to calculate the target curve level.

So while normally I'd suggest to set the RoomFit correction range upper frequency to about 400Hz, I wanted to see what happens if I set the upper limit to a much higher frequency - in the below test I chose to use 20Hz to 8000kHz range in RoomFit.

With this setting the target level was correct in both channels (as expected), but I was very pleasantly surprised to see that RoomFit still chose to assign all of its filter bands at frequencies under 500Hz:
View attachment 26154

Note that this will only work in some cases, mainly those where bass level is significantly higher than the mids and treble (so mids and highs stay below the target), and where a calibrated measurement microphone is used to measure. So it might work in your case, but we can't be sure without testing.

In case you decide to test it out I'd be interested to see your results. If you see RoomFit assigns any filters with significant gains above about 500Hz I'd advise to use the previous calibration instead. At least until WiiM improve their RoomFit algorithms.

In my case this RoomFit profile ("no boost mode") compares very favorably to a correction I created with REW (with only negative gain filters used):
View attachment 26162
Note that I used a slightly different target for the REW correction, which explains most of the differences.

Ok I'll try and test this tonight, thank you! I admire your dedication about it. Wiim should hire you like a test engineer for their products. Mutually they are also benefiting from your efforts.

 

[dominikz]

And I moved sub from the corner towards left speaker like it was before and little bit far from back wall like 20-30 cm.

View attachment 26185View attachment 26186View attachment 26187

All seetings the same

Did you change any settings on the sub compared to your initial attempts? The sub level in this latest attempt seems about 10dB lower than it was e.g. here:

I'd suggest to use the higher level for the sub because that helps with the dip.

Ok I'll try and test this tonight, thank you! I admire your dedication about it. Wiim should hire you like a test engineer for their products. Mutually they are also benefiting from your efforts.

Thanks! My motivation is mainly to learn more myself, but it is also a pleasure to share knowledge and help fellow members along the way.

We can only hope that WiiM will use some of our collective findings and suggestions to further improve their products!

 

[cristoo]

Did you change any settings on the sub compared to your initial attempts? The sub level in this latest attempt seems about 10dB lower than it was e.g. here:

I'd suggest to use the higher level for the sub because that helps with the dip.

Initially like 2-3 days ago when we started all this attempts sub level on unit was on 11 o’clock, than like yesterday after suggestion of one of users I lowered it to 10 o’clock and left so several latest trials are with these seeting. Today I only played with phase 0/180 and moved the sub. Should I increase sub level on unit or in WHA app? Or it doesn’t matter ?

One more thing - when moved the sub I changed the plug i used for mono connection form Ultra (from
right to left just for curiosity). It should not matter but just for info. I can replug like it was before.

I highly appreciate your and all community help. Thanks a lot.

 

[cristoo]

Ok I found one change, I had after switching off for a while my amp, smsl sdb eq setting on instead of direct. I switch to direct and increased the sub level. And we are back to what I had. I think I will give up coz I am losing this me vs acoustic battle even armed with Wiim equipment….

 

[dominikz]

Ok I found one change, I had after switching off for a while my amp, smsl sdb eq setting on instead of direct. I switch to direct and increased the sub level. And we are back to what I had. I think I will give up coz I am losing this me vs acoustic battle even armed with Wiim equipment….
View attachment 26199View attachment 26200View attachment 26201

This looks like a much better baseline for RoomFit compared to before - good work!
Now your response above 100Hz is already pretty good, and there's a healthy level of bass below it without severe dips.

Now we just need to fine-tune RoomFit parameters a bit. I'd suggest to try these:
Freq range = 25Hz-200Hz,
"No Boost Mode" = disabled,
Min Gain = -12dB,
Max Gain = +6dB,
Max Q = 10,
Individual Channel RoomFit

 

[cristoo]

This looks like a much better baseline for RoomFit compared to before - good work!
Now your response above 100Hz is already pretty good, and there's a healthy level of bass below it without severe dips.

Now we just need to fine-tune RoomFit parameters a bit. I'd suggest to try these:
Freq range = 25Hz-200Hz,
"No Boost Mode" = disabled,
Min Gain = -12dB,
Max Gain = +6dB,
Max Q = 10,
Individual Channel RoomFit

So we’re keep on fighting. Me or room acoustics. @dominikz lead towards victory.

Did RF as instructed, rest of setting including sub the same

 

[harkpabst]

That's what I had guessed back here. The dip is mainly caused by the listening position, so very hard to fix.

In this latest iteration the dip is a lot deeper again than it was before. Given that RoomFit is working hard to reduce the level from below 30 Hz up to above 100 Hz (up to -25 dB!) I'm still not convinced that a higher subwoofer level is the way to go in this very particular case. I'd go back to the setting where the 70 Hz dip is as narrow as as possible and as small in level as possible.

I was a bit surprised how much lowering the crossover frequency did improve the frequency response further up. This is definitely something you'll want to keep.

Maybe (and just maybe) this could be one of the rare cases where experimenting with overlapping crossover frequencies and/or asymmetric filter slopes could potentially improve the response in one exact listening position. But I don't think I'd want to follow this line of attack. Not without the help or REW and maybe not at all.