First floor plan single-family house 190m2

And how are the speakers accommodated there? For me, such a room layout always has a bit of the feel of the furniture boxes in furniture stores, where something different is furnished every 4 meters. It’s like a separation of the units. Have you ever considered the option of living with TV/home cinema as one room and cooking/eating as another room? It also has the advantage, if you have separate guests at times, that there are 2 areas to stay.

A attentive feedback from you. That is rare :)
Regarding your comments:

Our standard sitting/lying place is on the short part of the sofa. We fit comfortably there as a couple.

I remind you that you are planning for 2! children. Families sit together in front of the TV ;)

Is that to be understood as criticism or do you think that we are on a pretty good track with the draft?

Let me put it this way: if this speaker issue is so important to you, then the planning should also reflect that.
I can’t contribute anything on that... I once had those cable things (3D effect, stereo) and couldn’t get anything out of it in terms of audio or design.

Please only consider the living room, I haven’t adjusted the rest yet. We also actually find using the sofa as a room divider quite charming.

If you like that, then work on it. I don’t see speakers well living in the middle of a room. Can’t they be installed on the ceiling, inside the ceiling or something?

Well, if you have a plain kitchen unit, you’ll look at the wall. And you usually spend more time in front of the sink anyway, which is why the view out of the window is more important to us there.

I built to avoid having a plain kitchen unit :p
And no: I do stand at the sink several times, but only for a few minutes, while I do everything next to the stove. I look from my island into the garden, into the green. 20 meters away is my greenhouse, I can look into that <3 In between is my super cool dining table that I can’t get enough of. Also, you want the terrace connection when eating or grilling outside.
Window planning at the sink or vice versa originated from daylight so that you don’t need light during the day when doing dishes. Nowadays hardly anyone washes dishes by hand anymore because there’s a dishwasher ;)

Maybe I just don’t understand what you mean by "generous."

Well, seeing your house while living in it.
It’s often about sight lines that originate from a spot where you spend a lot of time, looking in one direction, and then a view extends into the distance in the garden. Rooms open up, nobody wants to look towards a wall. (Not even to the toilet!)
Preferably from the front door all the way to the end of the garden, with a great door with decoration in the hallway in between… or the cooking area with dining area, then terrace door, nicely decorated terrace and then in the background a nice flower bed…
You build a picture that you will see and that is visually pleasing. That’s how architecture works :)

Do you have examples of similar floor plans that you consider successful?

There are so many... I think you lack the vision to see rooms flexibly. For you, everything has to be assigned to one function where you can close the door then. But a home office can also be integrated with other functions, the trend was already 20 years ago to use rooms flexibly.
A kitchen is not only for cooking, but integrates into the living aspect, one of two offices can be openly accommodated in a living hallway for everyone etc.
… especially think about it if you realize you have too many rooms that are actually not necessary or a plan is overstretched by needing a very long hallway without any added use. Then I would at least simply consider whether you don’t get more value with a somewhat more open hallway in multi-use.

Our standard seat/reclining place is actually on the short part of the sofa.

If you lie there, the desired cinema sound will probably remain wishful thinking anyway. You are then shadowed from two or three sides (if you lie next to each other). For surround sound, you have to sit upright. Or are your ears in a different place than everyone else's? ;)

Have you alternatively ever thought about placing a half-height room divider? There are so many good solutions for that nowadays. Possibly combined with a gas fireplace - as a real eye-catcher. Just google “TV room divider freestanding.” I find it terribly uncomfortable to sit with your back to the dining table and stare at a wall instead of into the room and/or the garden. Especially when you have kids who play or do crafts at the table in the living-dining room, you want to keep an eye on the room. With kids, the sofa and the living room take on a whole different meaning! And the TV will probably lose them.
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If it were my house, I would probably favor the solution from kbt09, but relocate the windows. A huge lift-and-slide door and another north-facing window. That opens up the room best. Why the speakers can’t be hung on the wall behind the sofa (basically at its corners) is beyond my knowledge. We have it that way and the sound is great.

That is both even worse from an audio perspective, but actually this can't have such great importance here, otherwise the planning would have been different. In any case, speakers directly next to the ear on the wall are not recommended.

Especially when you have children who are playing in the living-dining room or doing crafts at the table, you want to keep an eye on the room.

I don't see why I would want that. When I am sitting/lying on the couch, I mostly don't want to watch the children. For me, this separation is welcome.

I can only recommend moving the couch away from the rear speakers. We implemented it that way and I test-wise placed the couch against the wall. The difference is definitely noticeable. Especially the back area of the room is more prone to humming from the sub. Our heads are about a meter away from the back wall. We are approximately 2 meters away from the speakers due to their arrangement.