Acoustic ceiling for reducing reverberation

Topic Acoustic Ceiling: Many people know these wood/felt panels from the hardware store and similar places. It is clearly visible here that the felt reduces the reverberation in the room. However, I find the appearance of the system from "Ligno" better. From the room side, I do not see any surface here that could absorb sound, only wood. Is anyone more familiar with this and can tell me to what extent this can reduce the reverberation in a room (in my case a living room with hard walls + very large windows)? Would additional insulation wool under the panels result in higher sound absorption?

Does anyone here know more about this and can tell me to what extent the reverberation in a room (in my case a living room with hard walls + very large windows) can be reduced by this?

The first question I have is why you think you will have so much reverberation in the small living space?
In a normal house there are furniture, carpets, decorations, lamps, pictures, plants, etc.
It is rather rare to have such a problem there.

Or will you furnish in a very minimalist way including tiled floors?

In the room, there will actually not be much absorbing material present. The biggest point here would be the sofa and that’s roughly it. Neither the parquet floor, the thin curtain, nor the few plants will help much. Instead, there are large glass and hard wall surfaces. And a living room is also the room where you want to listen to music properly sometimes.

You can achieve something with fabric curtains, acoustic absorbers, and ceiling sails, as well as rugs. Ideally, thick carpet on the floor, walls, and ceiling :) but usually ugly for a living room… but somehow practical if you can just vacuum your walls and ceiling haha

And a living room is also the room where you sometimes want to listen to music properly.

We have a larger open space,
with reverberation in the room,
the receiver's calibration system perfectly calculated and corrected it.
Tip: no bass box, that causes interference and cancellations,
2 large speakers down to 20Hz and 2 surround speakers down to 50Hz, that gives good sound

Yes, correct.

Although I would have rather recommended 5 bookshelf speakers and two subwoofers.
With two subs in the room, room modes can be well minimized and you get the pressure that you would otherwise miss in some films.

Alternatively, you could simply buy powerful active 2.0 floorstanding speakers, from Schwäbisch Gmünd €1,895 each.

Better good 2.0 than "quite okay" 5.1