Installation of sound ceiling in home cinema

Sound ceiling is the next step in my home theater.
Have calculated that 48 × 98 holds for 2 layers of plaster on the light opening I have.
According to a table I found at byggforsk, I am completely on the border with a 4m light opening.
But now I will not load the ceiling with anything more than a projector in addition to the plasterboard.
Bet it holds plenty.
Have not been able to do much this weekend due to family visits,
but took me a little construction session tonight.

Sound ceiling in home cinema.

Sound ceiling of 2 × 4 and then there will be 2 layers of plaster.

Installation of sound ceiling in home cinema

Insulation of home theater.

Then I started preparing for the isolation of home theater.
Must bend the string behind the postwork to keep the insulation in place and prevent it from seeping into the outer walls.
For this, I chose to use a regular red masonry cord that can be bought at most building material chains. Bought a reel of 150m which of course was exactly 1m too short.

mursnor

Put the reel in on a large nail so that you could pull off the string without having to hold it.

Insulation of home theater.

Ventilation in the home cinema.

Trying to think of the best way to get ventilation in the home theater without compromising the noise reduction in the room.
Has a horizontal guide into the room from the balanced ventilation in the house.
Had intended to put extra sound traps on this so that the sound from the home theater is not carried out to other rooms in the house via the ventilation system. Ventilation in the home cinema.