SYMPHONIUM X SUBTONIC
"Representing a generational leap for us, Helios was designed to disprove the stereotypes associated with multi-driver balanced armature earphones. Utilising newly developed technologies, our balanced armature subwoofers produce exceptionally clean sub-bass punch that hits hard, yet does not colour vocal presentation. Tuned for a smooth and detailed midrange, the Helios also features class-leading treble extension that pushes the limits of what balanced armature tweeters are capable of. We combined the best features of different monitors into a single product.
Powered by an integrated 4-Way crossover, the Helios is sure to impress with its dynamism and vigour. We never fail to push the limits." —Symphonium Audio
It has a tonality very similar to Hifiman HE1000SE, it out-resolves a HD800, 7hz timeless, pretty sweet overall for the price. Luckily i got ears of an elephant, so i have no comfort issues, but be warned: this thing is huge. The part that goes in the ear canal is really thick and long. Will certainly not make everybody happy. However if it fits it is pretty great. I do enjoy micro-details/resolution and aggressive (macro-dynamics, slam, sharp transitions) headphones. This is certainly not as aggressive as a HE1000SE, but surprisingly close for an IEM and for 1/4 of the price. Works great for rock/metal/synthetic-electronica tracks. Hard to drive, needs proper Amp or decent DAP.