Wired IEMs
7Hz Salnotes Zero
75Great
$20
Full review data7Hz Salnotes Zero vs TRN Earphone 4: which should you buy?
On aggregated review scores the 7Hz Salnotes Zero comes out ahead with a HearWiki score of 75. The full breakdown - sub-scores, specs and what reviewers actually said - is below.
Our pick: 7Hz Salnotes Zero - Great overall at around $20.
Wired IEMs
TRN Earphone 4
70Good
$11
Full review dataScore breakdown
Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.
7Hz Salnotes Zero leads on 3 of 4 measures.
- 7Hz Salnotes Zero
- TRN Earphone 4
HearWiki score
75
70
Sound
7.4
7.0
Value
8.8
6.5
Price (USD)
$20
$11
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 7Hz Salnotes Zero 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.
- Salnotes Zero20223 yr newer
- Earphone 42019
Specifications
Salnotes ZeroEarphone 4
- Type
- Wired IEMs
- Wired IEMs
- Price (USD)
- $20
- $11
- HearWiki score
- 75
- 70
- Released
- 2022
- 2019
- Availability
- Still sold new
- Still sold new
- Driver
- 1DD
- 4-driver hybrid
- Driver type
- dynamic
- hybrid
- Driver configuration
- 1DD
- -
- Driver size
- 10 mm
- 10 mm
- Drivers per side
- 1
- 4
- Frequency response
- -
- 20 Hz - 40 kHz
- Impedance
- 32 Ω
- 22 Ω
- Sensitivity
- -
- 105 dB/mW
- Active noise cancelling
- No
- No
- ANC type
- -
- none
- Transparency mode
- -
- No
- Companion app
- -
- No
- Custom EQ
- -
- No
- Wear detection
- -
- No
- Weight
- 5.8 g
- 7 g
- Detachable cable
- Yes
- -
- USB-C
- -
- No
- Connector
- 2-pin 0.78 mm
- -
- Model code
- -
- TRN MT4
What reviewers said
7Hz Salnotes Zero
The 7Hz Salnotes Zero is a wired, ultra-budget IEM that delivers a clean, balanced sound signature well beyond its price point. With a lightweight build and easy-to-drive 10mm dynamic driver, it’s a strong entry-level choice for listeners seeking neutral-leaning audio. Its main limitations are the lack of wireless features and any formal water-resistance rating, but for the cost, the tuning and value are exceptional.
- Pro:Excellent neutral tuning for the price
- Pro:Very lightweight and comfortable
- Pro:Easy to drive from any source
- Con:No wireless or ANC capabilities
- Con:No official water-resistance rating
- Con:Build feels basic compared to pricier models
TRN Earphone 4
The TRN Earphone 4 is an affordable wired in-ear monitor featuring a hybrid 4-driver setup that combines two balanced armatures and two dynamic drivers for a detailed, spacious sound. Its lightweight build and comfortable fit make it a solid budget pick for listeners who value technical performance and clarity over heavy bass. The earphone is best suited for those who prioritize resolution and airiness in their music.
- Pro:Hybrid 4-driver configuration for clear, detailed sound
- Pro:Very lightweight at 7g, comfortable for long sessions
- Pro:Wide frequency response up to 40 kHz
- Con:No noise cancellation or isolation features
- Con:Lacks app support and custom EQ options
- Con:Sound leans technical rather than warm or bass-heavy
Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.
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