Wired IEMs
Cozoy D2
81Outstanding
$55
Full review dataCozoy D2 vs KZ ZAS: 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.
Wired IEMs
KZ ZAS
62Good
$68
Full review dataScore 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
- KZ ZAS
HearWiki score
81
62
Sound
8.5
6.4
Value
9.0
4.4
Price (USD)
$55
$68
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 5 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 5 years between them, that is a thin return - treat this as a restyle rather than a new platform.
- D220265 yr newer
- ZAS2021
Specifications
D2ZAS
- Type
- Wired IEMs
- Wired IEMs
- Price (USD)
- $55
- $68
- HearWiki score
- 81
- 62
- Released
- 2026
- 2021
- Availability
- Sold new
- Still sold new
- Driver
- 2DD
- 1DD + 7BA hybrid
- Driver type
- dynamic
- hybrid
- Driver configuration
- 2DD
- 1DD + 7BA
- Driver size
- -
- 10 mm
- Drivers per side
- 2
- 8
- Frequency response
- -
- 10 Hz - 40 kHz
- Impedance
- 20 Ω
- 24 Ω
- Sensitivity
- -
- 109 dB/mW
- Active noise cancelling
- -
- No
- ANC type
- -
- none
- Transparency mode
- -
- No
- Companion app
- -
- No
- Custom EQ
- -
- No
- Wear detection
- -
- No
- Controls
- -
- buttons
- Weight
- -
- 11 g
- Detachable cable
- -
- Yes
- USB-C
- -
- No
- Connector
- 2-pin 0.78 mm
- 3.5 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
KZ ZAS
The KZ ZAS is a budget-friendly hybrid IEM that pairs a dynamic driver with seven balanced armatures for a lively, detailed sound. It offers a fun, bass-forward tuning that many will enjoy straight out of the box, with a comfortable and well-constructed shell. While its stock tuning may not suit everyone, it remains a versatile performer for the price.
- Pro:Energetic and engaging bass response
- Pro:Clear and detailed mids and treble
- Pro:Comfortable, lightweight build
- Con:Stock tuning may be too V-shaped for purists
- Con:Lacks active noise cancellation
- Con:No app support or custom EQ options
Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.
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