UiiSii i1
ø9mm Dynamic Driver

After the great HM6 and HM7, I went on to test UiiSii's flagship - the i1, which is supposed to be their best. However, they are worse than HM6 and HM7, both in clarity and loudness. You should use an amplifier with these to push them to their limits.

Buy on
  • The bass is great and has a lot of impact, as long as you get a perfect seal.
  • The build quality is very good. The thick cable might actually be a good idea, durability-wise.
  • The design is very premium.
  • The sound is darker and less detailed than HM6 and HM7, and slight muddiness can be heard.
  • The cable is much thicker and stiffer than other UiiSii products I've tested, makes it heavier and harder to use.
Package & Accessories

Chipboard (bare)

Ear Tips - Single-Flange:

S+M+L, unordinary, black, ø4mm bores


Black, oval, branded

Build & Materials

Metal + plastic* (matte), ø5mm nozzles, soft strain reliefs


Metal, single-button


Metal, no strain reliefs


Silicone-coated (rugged), 117cm, thick, semi-soft, bend-retaining


Metal, straight, short, soft strain relief

  • The housings have plastic back caps.
Comfort & Fit

The earphones are tiny, light and comfortable. But the included oddly-shaped tips are just not staying in. ROCK Zircon's tips and my foam tips worked much better.

Lows / Bass

The bass is dark and emphasized, but also adds muddiness to the sound as it leaks to the mids and pushes them back.

Mids / Vocals

The vocals are quite muffled and pushed back by the peak in the low-end.

Highs / Treble

The highs are quite crisp and precise. Not piercing and are quite pleasant even if not especially detailed.

Frequency Response