If don't know about Symphonium Audio or Subtonic by the time of this writing, then I don't blame you - until I got the tour unit I don't either. Though by chance if you know Toranku @ Head-Fi, then you might know a bit about Subtonic, though that's as far as I can say.
The Symphonium Helios is a collaboration IEM between Subtonic and Symphonium. If anything, this work also marks the first appearance of Subtonic in the market. Incidentally, with its pricing of ~1000$, both brands are showing their confidence in this collaboration by challenging the renowned top dog of the IEM chamber as well.
Will this be a triumph of the underdog or just a show-off like someone who all barks with no bites, let's find out.