Great let us know how it runs. I am wondering if you will hear a difference. I just tested (extended inverted drop) my DP Edge with a DA 50 inverted at about 2000 RPM idle and had no change and no dead stick. So far I get solid RPM no matter what I am doing. So far the box has not caused a problem.

I also think I have a test setup to test the effects of +/- pressure on the diaphragm. I need to get a set of springs so I can measure the effects of +/- spring tension. I have a Digital pressure tester and should have pictures of the setup and data by next week.