The 4.Ai, a hand crafted In Ear Monitor (IEM) utilizing the same internal design and components in the 4.A Custom In Ear Monitors (CIEM). The 4.Ai requires the same painstaking hand craftsmanship that all Heir Audio CIEMs require. The 4.Ai offers all the advantages of an IEM, built with the same exacting standards of all Heir Audio products. The 4.Ai, like its cousin the 4.A, offers a clean...
“ Comparing the new Energy Sistem E214 vs SoundMagic PL-30 vs Meelectronics M6-Clear (Westone UM3x also commented on) According to the company's website, this new IEM comes in various colors. The Black model is the E212, Blue is the E214 and so on. All the Energy Sistem models in this line look to have the same components, just made with different color bodies, and different colored...” --willyc32