| Agreed about not needing metal. I found heavey solid core wood doors at home cheapo. They are exterior doors almost 2" thick. Then build a frame with a door stop that goes all the way around including the bottom and use a good noeprene 3/8" seal. Also you can use the 3/8" seal between the 2 door frames. So you'll have a 2" solid door in it's own frame, a ~4" air space, then another 2" solid door - both sealed on all 4 sides.
Great idea about added mass to one door to change the resonant frequency - I'll have to try that for additional isolation - thanks.
Also a little absorbtion on the inside of the doors when closed is said to keep the air space from resonating - that might help as well. |