This is a picture of the iso cab that I built. It is a 22 mm woodbord box first then stuffing that is 30 mm that i bought from a carpart shop and then another 7 mm box on the outside. It works very good. I made it without the 22 mm box in the lid first but then it was louder and there was a lot of problems with high bass sounds. When I added the 22 mm box in the lid it was all that I wanted.
