Ahí atrás hice unas consultas a GIK Acoustics y en referencia a esas trampas me respondieron esto:
"...then you could go the tuned trap way (although they are a little too narrow for the application here) but they would need to sit in the high-pressure points. To find these you need to run the sines in those frequencies and these the room back to front, corners ceiling etc with an SPL metre to find the high-pressure points".