UiiSii US90
Ø9mm Dynamic Driver

UiiSii US90 is identical to UiiSii HM7 in every aspect, from build quality to nozzle diameter and tips, The sound signature is the same since it also contains the same exact drivers the HM7 has. US90 has lost a point just because, as you can also see by the graphs, the quality assurance wasn't great on this one, even if it's barely noticeable. Still, if you're going for these, I'd recommend going for the HM7 instead, they just look more mature.

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Pros
Cons
  • Extreme level of detail with a bright sound signature, and enough bass to keep things warm.
  • The build quality is superb.
  • These earphones smell amazing!
  • In my opinion, the package is very nicely designed, just like ROCK's products.
  • There is basically no sub-bass, but I bet it's the intended sound signature.
Package & Accessories
Package:

Paperboard + soft plastic (clear)

Ear Tips - Single-Flange:

M, white (translucent), Ø6mm grey bores

S+L, white (translucent), Ø6mm bores

Build & Materials
Housing:

Metal, Ø6mm nozzles (Ø5mm openings), soft strain reliefs

Remote:

Plastic (matte), single-button

Y-Split:

Metal, no strain reliefs

Cable*:

Silicone (rugged), 130cm, soft, straight

Plug:

Metal, straight, short, soft strain relief

  • The cable has an extremely pleasant bubblegum-like smell.
Comfort & Fit

The earphones are tiny, light and comfortable. They have an orb-like shape, and fit in a very specific way into your ears and stay there firmly.

Lows / Bass

These earphones still don't have a superb bass, but it's less flat than the previous HM6, which makes HM7 more fun to listen to. There is enough bass to fill the mids with pleasant warmth.

Mids / Vocals

Extremely clear and vivid vocals, and are also pretty loud. Mesmerizing channel separation. The high-mids and highs were indeed improved in clarity.

Highs / Treble

The treble has improved significantly, and the sound has a pleasing brilliance to it.

Frequency Response
UiiSii
GT500
HM6
HM7
i1
US90