We (not me, a friend (professional ) ) were doing painting last weekend,
so the living (40 sqm) was nearly empty.
When talking there, it was like in a cathedral. kind of echo,
though some furniture was still left there,
I tested speakers : Whoow!
Totally different sound.
Now I am wondering what the reason is.
I really suppose the curtains are.
There are a lot in that room.
Those will swallow the sound.
I will do more research!
PS: My daughter liked to sing there!
She is a good singer so it was first fine, but it had to be stopped after a while!