Despite having the XIAOMI (or MI) branding is actually design and manufactured by 1More, a well known audiophile company with their own line up of IEMs and Headphones. This products comes in few different name depending on your region (to CON-fuse users), namely; Mi Capsule Earphones or Mi Capsule Piston Air. All are the same no worries.

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The characteristic of this audio hardware is semi-in-ear with a sound characteristic of an earphone (an IEM with little sound isolation, thus the open back nature). The sound isolation is minimal as you can hear your surrounding more, great for commuting to and back from work as you do not want to get run down by a bus.

The package doesn’t include additional eartips since its non-removable and is an one size fits all, well suited for smaller ear size. The sound tube is angled at 45 degree for in-ear comfort and the external silicon capsule fits well with the outer ear easily. The grip is good for light workout activities. I wish the tube was longer so it can reach deeper into the ear canal to provide better sealing (sound isolation) which can help with bass pressure felt.

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The spiral part that Mi claim’s to help with audio quality…….

Each side house a 7mm dynamic driver, tho XIAOMI say that the external spiral design helps with the sound signature. I don’t think is true but I can say the the bigger the air chamber, the better the bass pressure would be, by theory.

The cable does not touch the face, the control center is located near the mouth which is a good thing. The buttons are nice and clicky (easy to accurate). It has buttons to control the volume, media playback and call control. For the microphone test do check out our video review.

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Technical Specification

  • Model: E1009
  • Type: Hybrid/Semi In-Ear
  • Frequency Range: 20Hz – 20,000 Hz
  • Impedance: 32 Ohms
  • Sensitivity: 100 dB/mW
  • Rated Power: 5 mW
  • Length: 1.25m
  • Weight: 14g
  • Color: Space Gray / Silver / Pink / Green

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Audio quality

Now for audio quality test we use the Iphone 6 at 50% volume with the portable AMP/DAC Cozoy TAKT

Pop/EDM:

Tiaan – Be Ok

  • Low bass frequency pressure can be felt, decent energy but not the best. Again if the sealing was better, it will sound much more powerful.
  • Bass body is good, however the bass vibrations is loss due to the semi-open-back.

Pia Mia – Do It Again

  • Bass pressure is decent, not powerful but good tho.
  • Bass doesn’t eat into the vocal clear separation between the two.
  • Bass subtle vibration at 2.05 is missing because of the semi-open-back.

Vocals/Instrumentals:

Pentatonix – See Through

  • Vocal perform well, leaning towards the warm sounding rather the crystal clear sound type, which is very nice especially listening to acapella songs.
  • Not muffling sound, each singer in the group can be identified.
  • Vocal beatboxing, humming, echo is good overall.
  • Mitch Grassi hi-pitched/hi frequency male tenor vocal is do-able, lacks shine at highs.

Violinder – Raindrops

  • Violin/piano overpowers bass/drums the tones, which I favor and prefer.
  • Violin/Piano sound very good, more toward the warm sounding rather than the crystal type.
  • Clear separation between Bass/Drums and Violin/Piano.

Despite being a budget Semi-open back IEM, which is usually dominated by bass heavy IEMs. I would say this Hybrid IEM performs from the mids to the upper-mid range, in short for vocals like acapella songs. This is not for bass heads.

Purchase the Xiaomi Mi Piston Air Here

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