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...
“ I would personally like flat colors on the design but hey ts just me. Noise Isolation is really great (and I regularly commute home here in Manila, which is really loud at peak hours) Would I recommend it? Well Sure if you really are on a tight budget, but if you can add $10 to $15 dollars more you can get a sweeter pair. ” --PLsg08