The Crunch Box Distortion MI Audio's take on the high gain British. The history of the Crunch Box actually goes back a few years. They came up with the design after careful study of the way that modern British style amps get their overdrive and found that there was a very big concentration of the frequency information in the midrange. So they started to experiment with different prototype ideas, and settled on a design in late 2003. Since then, various prototypes were sent out for serious road testing, and the final design was released in early 2006.