Floor plan planning shortly before submitting the building application

But the big woofers don't really provide the dynamics that a 5.x system needs. I would consider cubes there, which might also be on the ceiling.

Could you please explain that in more detail? Because you actually read the opposite almost everywhere...

The dynamics of sound transducers is a broad field in itself. After all, amplifiers are "not entirely uninvolved," but size was never really decisive.

Attached is again briefly a section of the office including the north arrow.

The parapet height is no longer correct, unfortunately it has not been changed yet; it is now 90 cm.

I was thinking of turning the desk more to the right so that it stands in the upper corner facing plan right. This way you still have light from outside but can also keep an eye on the room or people at the door with a slight glance to the right instead of always having to turn around. I somehow don't like the idea of sitting with a view to the window and your back to the entire room. What do you think?

What we do about the supply shaft currently drawn there, we will have to see....

... if you have a floor plan for your office question, it would be good to share it. I definitely don't see any picture.

Sorry, I forgot the attachment.

Since somehow it no longer shows me any older attachments:

What finished room height do you have?

I'm asking because of the window size.
You write that the parapet height is no longer correct, that it is now 90cm.
I assume YOU mean measured from the finished floor.
In our plans, however, the parapet height was given in relation to the raw floor, since this measurement is important for the shell builder and they do not initially care how high the floor build-up is. I realize that your plans are still drafts and not execution plans, but still a risky game.

Besides, I think I once read that you are planning higher room heights than 2.50m, which makes sense for a house of this size. Since I don't know how high, I'll now assume 2.75m.
BUT:
Are you aware that although you have increased the room height, the windows and doors have not?!

According to your office picture above the window, you have a lintel of about ~49cm(!!!) height. 2.75m - 1.00m parapet - 1.26m window height = 0.49m.
In the end, it looks like you set the windows too low. The same goes for the interior doors.

Apart from the fact that even the obligatory 30cm lintels do not please me, that would be a real no-go for me...