The Marshall-in-a-box (MIAB) is a burgeoning stompbox genre. These days there are even pedals built to emulate performance characteristics of more modern Marshalls, like the 2204, JCM800, and hot-rodded versions of those amps. But because the golden-age plexis are such near-perfect amps, there is never a shortage of ambitious builders eager to have a go at building a box just a bit closer to the real thing.