Hidizs released a brand new multi-BA IEM, the Hidizs MD4 in late June. Designed with four custom-designed balanced armature drivers on each side. Hidizs has featured a precisely designed three-way frequency crossover, giving two BA drivers for the lower end, one BA driver for midrange, and one BA driver for the treble frequency region. The pair houses a 3D-printed acoustic tube structure. There are two tuning switches at the back of the ear shells. They allow the users to easily … Continue reading Hidizs MD4 4BA IEM Review