“*Please ignore the audio quality / comfort / design / isolation / value sliders for this review. As far as I can tell, they seem broken* This is a universal in-ear monitor with a two balanced armature drivers and a dynamic driver. This earphone costs $1250 IEM with a cable that costs about $800, or as a package together, about $1400. I'm part of an Australian listening tour for this...” --a_recording
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...