Wired IEMs
Cozoy D2
81Outstanding
$55
Full review dataCozoy D2 vs Sennheiser CX 300S: 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
Sennheiser CX 300S
57Average
$61
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 5 measures.
- Cozoy D2
- Sennheiser CX 300S
HearWiki score
81
57
Sound
8.5
6.2
Calls
-
5.8
Value
9.0
5.6
Price (USD)
$55
$61
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
- CX 300S2026
Specifications
D2CX 300S
- Type
- Wired IEMs
- Wired IEMs
- Price (USD)
- $55
- $61
- HearWiki score
- 81
- 57
- Released
- 2026
- 2026
- Availability
- Sold new
- Sold new
- Driver
- 2DD
- dynamic
- Driver type
- dynamic
- dynamic
- Driver configuration
- 2DD
- -
- Drivers per side
- 2
- 1
- Frequency response
- -
- 17 Hz - 21 kHz
- Impedance
- 20 Ω
- 18 Ω
- Sensitivity
- -
- 118 dB/mW
- Active noise cancelling
- -
- No
- Controls
- -
- buttons
- Weight
- -
- 12 g
- Detachable cable
- -
- No
- USB-C
- -
- No
- Connector
- 2-pin 0.78 mm
- 3.5 mm
- Microphones
- -
- 1
- Microphone type
- -
- MEMS
- Mic sensitivity
- -
- -44 dBV
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
Sennheiser CX 300S
The Sennheiser CX 300S is a budget-friendly wired in-ear headphone with a dynamic driver, offering a bass-heavy yet versatile sound signature with clear vocals. It's a practical, lightweight choice for everyday music and calls via a 3.5mm connection, though it lacks advanced features like noise cancellation or a detachable cable.
- Pro:Strong bass presence
- Pro:Clear and distinct vocal reproduction
- Pro:Lightweight and comfortable fit
- Con:Microphonics (cable noise) can be noticeable
- Con:Bass control and treble presence are limited
- Con:Build durability is a concern
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.