It's official - I now own more custom IEMs from Heir Audio than I ever have from any other company. Prior to this my record was two sets of Westones and two pair from Ultimate Ears. With the recent acquisition of the Heir Audo 4.A, I now have three sets of Heir Audio customs. Why so many? It's simple really: I'm a custom IEM nut, and Heir Audio makes excellent custom IEMs. See how that works?