Short answer
The 7Hz x Crinacle Zero:2 is a single 10 mm dynamic driver IEM, 32 ohm, with a detachable 0.78 mm 2-pin cable. It was listed around $25 when it reached stores in late 2023. It suits anyone who wants a balanced, research-target style first IEM for very little money.
Specs
7Hz Zero:2 at a glance
| Spec | Zero:2 | Source |
|---|---|---|
| Driver | 1 dynamic, 10 mm, PU and metal composite diaphragm (maker claim) | Hangout.Audio |
| Impedance | 32 ohm | Hangout.Audio |
| Frequency range (listed) | 10 Hz to 20 kHz | Hangout.Audio |
| Cable | Detachable, 0.78 mm 2-pin | Hangout.Audio |
| List price | About $25 | IEM Ranking |
Who it suits
- First-time IEM buyers who want to hear a research-target style tuning cheaply.
- A spare pair for travel or the gym, where losing it would not hurt.
- Not ideal if you want a mic out of the box or a deep, heavy bass.
Check the Zero:2 price on Amazon
Alternatives at the same price
-
01Alternative
Moondrop Chu II
Best for: a similar single dynamic from Moondrop
- Driver
- 1 dynamic, 10 mm
- Impedance
- 18 ohm
- Cable
- 0.78 mm 2-pin
- Specs from Audiophonics
- A DSP version adds USB-C and a mic
-
02Cheaper
Truthear Gate
Best for: an even smaller budget, brighter sound
- Driver
- 1 dynamic, 10 mm
- Cable
- Detachable 2-pin
- Impedance
- 28 ohm
- $18.99 list per Pragmatic Audio
- Reviewers praise its cable
Curves on this site are illustrative shapes drawn to explain an idea. They are not measurements of any product. For real measurements, see squig.link and Crinacle.
More picks in best IEMs under $50. For 7Hz’s planar, see best IEMs under $300.
Questions people ask
What is the difference between the Salnotes Zero and Zero:2?
The Zero:2 is the successor, tuned with Crinacle, with a composite diaphragm and revised internals per the maker. IEM Ranking lists the Zero at about $20 and the Zero:2 at about $25. Check which one a listing actually sells.
Is the 7Hz Zero:2 good for gaming?
It can be for casual play. It has no mic on the standard cable, so add a 2-pin mic cable or a desk mic for chat.
Does the Zero:2 need an amp?
No. At 32 ohm it plays loud enough from a phone or a basic USB-C adapter for most listeners.
What is 7Hz known for besides the Zero line?
7Hz also makes the Timeless line of planar IEMs. The Timeless II uses a 14.5 mm planar driver and sits in the under $300 tier.
Sources
Last reviewed October 12, 2026. Models, versions and listings change; check the product details before you buy, and keep the volume sensible.