Our take

 

FatFreq's signature sub-bass, in a shell you can wear all day. Enormous low end — and mids and highs that don't get buried.

 

This is for you if: You love bass and you've been let down by sets that turn it to mush. Bass-driven music is your daily listening.

Look at other IEMs if: You want flat, neutral or vocal-first. The low end is the headline here, by a wide margin.

How it's designed

  • Build: Small blue resin shell with 2-pin connectors; the stock cable is weak for the price.
  • Comfort: Compact and light — very comfortable, suits smaller ears and long listens.
  • The specs:
    Drivers: 1DD + 2BA
    Impedance: Not published
    Sensitivity: Not published

What we hear

  • Bass: Colossal and deep — a subwoofer-like sub-bass shelf you feel, kept tight under ~200 Hz.
  • Instruments: Take a back seat to the bass; lower mids sit slightly recessed.
  • Vocals: Clear and well-defined — stay intelligible even under all that bass.
  • Treble: Rolled off and smooth — non-fatiguing.
  • Details: Average for the price — competent, not a detail specialist; the bass is the point.