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7Hz Sonus vs Cozoy D2: which should you buy?

On aggregated review scores the Cozoy D2 comes out ahead with a HearWiki score of 81. The full breakdown - sub-scores, specs and what reviewers actually said - is below.

Our pick: Cozoy D2 - Outstanding overall at around $55.

Score breakdown

Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.

Cozoy D2 leads on 4 of 4 measures.

  • 7Hz Sonus
  • Cozoy D2
HearWiki score
73
81
Sound
7.4
8.5
Value
8.0
9.0
Price (USD)
$60
$55

Generation & platform

The scores rank quality. This is the other question: is the newer one actually newer technology, or the same platform in a new shell?

Same generation

The Cozoy D2 is 3 years newer, but it is the same generation of hardware: nothing in the radio, the codecs or the noise cancelling separates them. Nothing separates them on convenience features either, so the choice comes down to tuning and price. For 3 years between them, that is a thin return - treat this as a restyle rather than a new platform.

  • Sonus2023
  • D220263 yr newer

Specifications

SonusD2
Type
Wired IEMs
Wired IEMs
Price (USD)
$60
$55
HearWiki score
73
81
Released
2023
2026
Availability
Still sold new
Sold new
Driver
1DD + 1BA hybrid
2DD
Driver type
hybrid
dynamic
Driver configuration
1DD + 1BA
2DD
Drivers per side
2
2
Impedance
30 Ω
20 Ω
Detachable cable
Yes
-
Connector
2-pin 0.78 mm
2-pin 0.78 mm

What reviewers said

7Hz Sonus

The 7Hz Sonus is a budget-friendly hybrid IEM that delivers a balanced, detailed sound with controlled bass and articulate treble, punching well above its price point. Its neutral tuning with a sub-bass lift and forward mids suits analytical listeners, though its average build quality and occasionally bright treble may not appeal to everyone.

  • Pro:Excellent detail retrieval and technical performance for the price
  • Pro:Balanced, genre-versatile tuning with clean bass
  • Pro:Strong value in the sub-$100 IEM market
  • Con:Treble can be sibilant or fatiguing for sensitive ears
  • Con:Build and included cable quality feel average
  • Con:Shell design may cause fit discomfort for some users

Cozoy D2

The Cozoy D2 is a budget-friendly wired IEM that pairs a 6 mm beryllium driver with a 10 mm graphene-composite driver for a dual-dynamic setup. It offers a flexible connection via a 2-pin 0.78 mm cable that includes swappable 3.5 mm and 4.4 mm plugs, catering to both standard and balanced sources. With a 20-ohm impedance, it's easy to drive from most devices.

  • Pro:Dual-driver hybrid design for detailed sound
  • Pro:Interchangeable 3.5 mm and 4.4 mm plugs
  • Pro:Low impedance (20 ohms) for easy pairing
  • Con:No active noise cancellation
  • Con:Wired only, limiting portability
  • Con:Budget build may not suit all users

Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.

Compare something else

Swap either side out, or start again from the picker.

New comparison7Hz SonusCozoy D2