In terms of sound transmission and getting down to an NC rating of about 20 in a dedicated home theatre, the door/s are the weakest part of the room. A standard 36mm solid core door with seals has an STC of approximately 30. When you put an STC 30 door on a 10m2 (~100 square feet) wall with an STC of 55, the overall STC of the wall+door is reduced to 36.
So if one is spending the time and money to properly decouple the walls of their dedicated home theatre (or other such quiet space) a door like this is a 'sound' investment.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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In terms of sound transmission and getting down to an NC rating of about 20 in a dedicated home theatre, the door/s are the weakest part of the room. A standard 36mm solid core door with seals has an STC of approximately 30. When you put an STC 30 door on a 10m2 (~100 square feet) wall with an STC of 55, the overall STC of the wall+door is reduced to 36.
So if one is spending the time and money to properly decouple the walls of their dedicated home theatre (or other such quiet space) a door like this is a 'sound' investment.