New windows are very sound-permeable - what else can be changed?

We bought a house last year with a construction year 1991 and renovated it. Including new triple-glazed plastic windows and (thermal) insulated roller shutter boxes.

Now, however, the windows are very noisy and you hear wind and street noise booming and humming. Not super loud but annoying. Now I am trying to locate the weak points, which I have not clearly succeeded in. Maybe there are several spots?

- The roller shutter box has only 2 cm insulation at the bottom and on the front side. Regarding thermal insulation it seems sufficient but concerning sound probably too little?
- The window reveal (here I see significant heat loss, but maybe a 6-degree difference is still normal?)
- The glass panes themselves?
- Or even the 36 cm brick masonry?

Where can or even must the window installer still make improvements? What is generally still possible afterwards at manageable costs?

Thank you very much!

Now the windows are very thin-walled and you can hear the wind and street noise roaring and humming.

I suspect that it is not the windows themselves, but the installation. Perhaps the windows are a bit smaller than necessary, then only as much foam as needed and that's it. The sound then comes "around the window." Do you have overview photos from outside and inside or of the installation? Then maybe more can be said.

Thank you. Unfortunately not from the installation. Attached are more pictures.

Now I am trying to locate the weak points, which I am not clearly successful in.

It may also be that you are simply exposed to different ambient noises and perceive it as unusually loud, although it is normal. Wind according to the weather direction, traffic noise that you did not have before.

I found an old picture. You can see expanding foam oozing out at the bottom.