Heir Audi review units will arrive at end of this week
includes the 3.Ai, 4.Ai, Tzar 90, and Tzar 350, along with cases and 3 sets of Magnus 1 cables (and accessories like tips and rubber bands). Wow, lots of stuff to play with.
The Tzars are the new IEM amplifiers from Heir Audio.
Aren't the Tzars universal IEMs that are meant to be used with amplifiers? Not amplifiers themselves.