"Jo - the girl" wrote

I don't expect for a typical house to be soundproof, but is it normal
to be able to hear a TV through a floor?

It can be. Odd acoustics. If you can move the TV a bit, try that?

If not possible, the suggestion of a heavy carpet and an undercarpet will
help alot. It can even just be layered old carpets, say 2 or even 3.