Tech Tuesday: Deep Dive into Room Correction

harkpabst · 2025-02-20T01:50:12-0800

Vignus said:
I have followed all the good advises I received on this forum, but my RC still looks weird to me and I really hope I can get some extra help here.
To recap, I'm now using a Dayton iMM-6C external mic with the calibration file, connected to my tablet or to my phone.

I've set B&K Target Curve, Freq 30.0 to 4000.0 Hz, Smoothing 1/6 Octave and measured with stereo, one or 3 swipes. Given that my room has bad audio peakes up to around 100Hz, I would expect everything below that range to be reduced. But below's what I get. I wander if I'm doing something wrong... any help?

View attachment 17441

If this is weird or not depends on what the evaluation measurement shows, if you try to correct beyond the capabilities of your speakers and what mic you are using.

The PEQ filters alone don't tell the whole story.

Vignus · 2025-02-20T01:55:06-0800

harkpabst said:
If this is weird or not depends on what the evaluation measurement shows, if you try to correct beyond the capabilities of your speakers and what mic you are using.

The PEQ filters alone don't tell the whole story.

Could you be a bit less macchiavellian, please? There's nothing wrong with my speakers (Sonus Faber Lumina II) and the mic has always received very positive reviews on the forum

slartibartfast · 2025-02-20T02:23:25-0800

Vignus said:
Could you be a bit less macchiavellian, please? There's nothing wrong with my speakers (Sonus Faber Lumina II) and the mic has always received very positive reviews on the forum

Show us a screenshot showing the measured response, target response and predicted response. Then we can see the whole picture.
Also just to compare try another measurement with no calibration file selected (you have selected the calibration file rather than just adding it haven't you?)

harkpabst · 2025-02-20T02:39:01-0800

Vignus said:
Could you be a bit less macchiavellian, please? There's nothing wrong with my speakers (Sonus Faber Lumina II) and the mic has always received very positive reviews on the forum

I was just trying to point you into the right direction, not criticising your perfect speakers.

The Lumina II are small speakers, still, and trying to "correct" them down to 30 Hz may cause exactly the giant >10 dB EQ hump that you got, depending on your room and speaker placement.

I missed the part about the iMM-6C, otherwise I wouldn't have mentioned the mic.

Vignus · 2025-02-20T02:44:07-0800

Here's the measured/target/predicted response. I know my speakers are small but they go down to 55hz. I wonder if that's the issue, but event when I select 50-4000 the result doesn't change much. And, I was non trying to be offensive, apologies if I came out that way.

slartibartfast · 2025-02-20T02:59:57-0800

Vignus said:
Here's the measured/target/predicted response. I know my speakers are small but they go down to 55hz. I wonder if that's the issue, but event when I select 50-4000 the result doesn't change much. And, I was non trying to be offensive, apologies if I came out that way.

View attachment 17442

20dB down at 50Hz then. Are the speakers far from the back wall? You could try placing them much closer to the wall.

Vignus · 2025-02-20T03:02:57-0800

slartibartfast said:
20dB down at 50Hz then. Are the speakers far from the back wall? You could try placing them much closer to the wall.

They are actually quite close to the back wall, about 60 cm, measuring from the speaker's front

slartibartfast · 2025-02-20T03:06:49-0800

Vignus said:
They are actually quite close to the back wall, about 60 cm, measuring from the speaker's front

My small floor standers are only 33cm away from the wall.

Vignus · 2025-02-20T03:17:43-0800

Actually I measured again: they are 45 cm from the wall, can't push them back more, due to my speaker cables.
So, do you have more advise on how to set a proper RC?

slartibartfast · 2025-02-20T03:29:16-0800

Vignus said:
Actually I measured again: they are 45 cm from the wall, can't push them back more, due to my speaker cables.
So, do you have more advise on how to set a proper RC?

I have no idea why the response is so low at 50Hz

Sonus Faber Lumina II - Review & Measurements by Erin

Text data: https://www.erinsaudiocorner.com/loudspeakers/sonus_faber_lumina_ii/ PS: A very coloured speaker line indeed, according to these measurements and ones from Stereophile. It confirms what I've personally heard in this Lumina family: just treble heavy, even off-axis.

www.audiosciencereview.com

I use a subwoofer.

Wiimer · 2025-02-20T03:44:29-0800

Vignus said:
Actually I measured again: they are 45 cm from the wall, can't push them back more, due to my speaker cables.
So, do you have more advise on how to set a proper RC?

Can you show us the L/R RC results?

slartibartfast · 2025-02-20T03:59:12-0800

Vignus said:
Actually I measured again: they are 45 cm from the wall, can't push them back more, due to my speaker cables.
So, do you have more advise on how to set a proper RC?

This response from Erin's review paints a different picture to your measurements.

Vignus · 2025-02-20T08:09:20-0800

slartibartfast said:
This response from Erin's review paints a different picture to your measurements.

Too bad I'm not Erin LOL

slartibartfast · 2025-02-20T08:18:00-0800

Vignus said:
Too bad I'm not Erin LOL

They aren't wired out of phase are they

Vignus · 2025-02-20T08:29:06-0800

slartibartfast said:
They aren't wired out of phase are they

Mmmmm... they are bi-wired but in the proper way, I think...
How do I check that, other then looking at cables colors?

Vignus · 2025-02-20T08:30:53-0800

Wiimer said:
Can you show us the L/R RC results?

slartibartfast · 2025-02-20T08:46:12-0800

Vignus said:
Mmmmm... they are bi-wired but in the proper way, I think...
How do I check that, other then looking at cables colors?

You are getting the same roll off measuring left and right separately so they can't be out of phase. Does it sound like the bass is missing?

Vignus · 2025-02-20T08:49:47-0800

slartibartfast said:
You are getting the same roll off measuring left and right separately so they can't be out of phase. Does it sound like the bass is missing?

It never sounds like the bass is missing, it sounds like there's too much bass even after RC. The only way to get rid of too much boomy bass so far, has been using DSPeaker, but I'd really love to achieve a good result with Wiim RC and drop DSPeaker

slartibartfast · 2025-02-20T08:55:40-0800

Vignus said:
It never sounds like the bass is missing, it sounds like there's too much bass even after RC. The only way to get rid of too much boomy bass so far, has been using DSPeaker, but I'd really love to achieve a good result with Wiim RC and drop DSPeaker

When you measure with DSPeaker do you see the same roll off. I always associate DSPeaker with subwoofers. Do you have a subwoofer?

harkpabst · 2025-02-20T09:09:59-0800

This almost looks as if the subwoofer setting is on, but no sub is connected.

The slope of the resulting effective acoustic high pass looks way too steep, even for a ported speaker. Between 20 Hz and 40 Hz it appears to be more than 40 dB per octave. This almost resembles the natural roll-off of a reflex box (24 dB/octave) plus an electrical 4th order high pass filter.

Edit:
This OTOH would not explain why there is rather too much perceived bass ...

Tech Tuesday: Deep Dive into Room Correction

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