Aerated concrete wall between living room and bedroom is too sound-transmitting, so should a double wall be used?

Hello everyone.

We have an 11.5 cm Ytong wall between the bedroom and the living room, but it is so acoustically transparent that you can hear everything from the living room in the bedroom, for example when someone is watching TV at a low volume.

Now we are considering adding a second wall in front of the existing wall in the living room with some distance in between. The idea is a solid heavy sand-lime brick wall (but then masonry connectors would have to be installed between the aerated concrete and the sand-lime brick wall, which means there would be no decoupling of the two walls, right?) or a lightweight construction wall with CW/UW profiles, mineral wool insulation, and double-layered, or even triple-layered gypsum fiberboard.

How would you do it?

Best regards

I would prefer the stud frame for several reasons: - many easier to realize - use additional soundproof insulation - use decoupled profiles / no contact with the existing wall - Rigips Silentboard for cladding - double layer possible if necessary