I designed and cut a assembled a classic looking Radio Box. It has faux knobs and a cutout and cradle to direct the speaker sound from my iPhone into the box and out through the grill. The cuts were nearly identical and I had a slip when I glued to front on, (so it rocks a bit on it’s feet). I am going to make a jig to hold the parts in place when I glue next time. It’s a prototype and it really works! It is like the idea of a guitar box.
No testing. Just thinking of space, and wanted a chamber about the size of a guitar box for sound reverb. What is great about the software is that you can cut as many or as little as you want. See what works good for you. I did 5 spacers and it works awesome.
That’s the way audio works, the bigger the amplitude the louder it is.
Old style AM radio had a 40 to 5000 Hz (CPS in those days) frequency response, plus throw in some static and fade, and maybe some extra distortion for authentic tube sound