Will BC Place still be NOISY under a Retractable Roof? Certainly with the Roof open, it will likely NOT be NOISY.
But how about with the Roof Closed? Compare the NOISE level to the dome. The acoustic properties will no doubt be different and regrettably the new Stadium may be slightly quieter.
The top of the new Retractable roof (note the position of the top of the center crane) will be at 200 feet which is the height of the apex of the old dome. The sides as you can see in the pic will be higher. Each of those masts is 270 feet above the ground and glass will surround the top rim.
Glass is an excellent reflector of sound so that part is promising. However the volume of the new Stadium will be greater than that of the dome ( 90 million cubic feet ) due to the higher sides and this will create more echo.
An analysis is welcome