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Cozoy D2 vs Tanchjim OLA II: which should you buy?

Specs, scores and condensed review verdicts for the Cozoy D2 vs Tanchjim OLA II, side by side. Where a product has no HearWiki score yet, not enough reviews have been aggregated to rate it.

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.

  • Cozoy D2
  • Tanchjim OLA II
HearWiki score
81
-
Sound
8.5
-
Value
9.0
-
Price (USD)
$55
$57

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

Both shipped in 2026. These are 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.

  • D22026
  • OLA II2026

Specifications

D2OLA II
Type
Wired IEMs
Wired IEMs
Price (USD)
$55
$57
HearWiki score
81
Not scored
Released
2026
2026
Availability
Sold new
Sold new
Driver
2DD
2-driver hybrid
Driver type
dynamic
hybrid
Driver configuration
2DD
-
Driver size
-
10 mm
Drivers per side
2
2
Frequency response
-
8 Hz - 48 kHz
Impedance
20 Ω
30 Ω
Sensitivity (dB/Vrms)
-
121
Active noise cancelling
-
No
Connector
2-pin 0.78 mm
2-pin 0.78 mm

What reviewers said

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

Tanchjim OLA II

The Tanchjim OLA II is a hybrid wired in-ear monitor that pairs a 10mm dynamic driver with a balanced armature in a coaxial layout for clear, low-distortion sound. It offers a wide frequency range and comes with versatile cable connectivity options, including a standard 3.5mm, balanced 4.4mm, and DSP USB-C. Priced around $57, it's an approachable entry into high-quality hybrid IEMs.

  • Pro:Hybrid driver setup delivers detailed, balanced audio
  • Pro:Wide frequency response from 8 Hz to 48 kHz
  • Pro:Multiple cable options for different sources
  • Con:Requires a wired connection, no wireless or ANC
  • Con:May need a good source to fully drive its potential
  • Con:Balance armature can be sensitive to fit and seal

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

Compare something else

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New comparisonCozoy D2Tanchjim OLA II