Ok, obviously is not something that you will not sleep with , I just wanted to point how that works.
Anyway you can make a simple test, remove the plastic case, close the hull and record the sound, then replace the case and do the same ( talking about an uncut speaker box).
Play both sounds using some audio amplifier with graphic equalizer and you will realize the function of the box.
There is not a problem if you made the cut, still this is a hobby, I just wanted to tell you how the thing works, there was not a bad intention or ridicule your work.
Well now we were talking about sound I'm going to enjoy the one of my T55 Hooben [:@]