7Hz x Crinacle Zero 2 Review

7Hz Crinacle Zero 2 review featured

In this review, I’m looking at the 7Hz x Crinacle Zero 2 IEM. The Zero 2 is an evolution of the original Salnotes Zero. Zero 2 features an updated 10mm dynamic driver and a new sound signature. It’s priced at $25.

Disclaimer: This sample was provided by Linsoul for an honest review. All observations and opinions here are my own, based on my experience with the product.

7Hz x Crinacle Zero 2 Review
The 7Hz x Crinacle Zero 2 is a great follow-up to the original model.
Add your rating here!5 Votes
Enhanced, physical bass response
Good tonal balance
Non-fatiguing treble
New cable handles better
Not as resolving or detailed as the original
Our Score

7Hz x Crinacle Zero 2


Impedance: 32 ohms
Sensitivity: 108dB/V@1KHz.
Frequency response range: 10-20000Hz
Total Harmonic Distortion (THD): <1% at 1KHz
Driver: 10mm dynamic driver
Interface: 0.78 dual-pin interface for connection


The 7Hz Zero 2 has the same shape as the previous model with acrylic shells and aluminium faceplates. However, this time the shells are transparent and there are some new colourways.

I found the original Zero to be comfortable so the Zero 2 also suits my ears well. I can wear the IEMs all day long without any discomfort. Passive noise isolation is average, making the Zero 2 suitable for most everyday environments.

7Hz Zero 2 stock cable

We still get the same 0.78mm 2-pin connectors but the Zero 2 comes with an upgraded silver-plated-copper (SPC) cable. This new cable is more supple than the old one and handles a bit better.


Gear used for testing includes the Audalytic AH90, HiBy M300 and Shanling UP4. Zero 2 is an efficient IEM so it doesn’t need any special source or extra amplification.

7Hz Zero 2 has a warmer, more fun sound signature compared to the original Zero. I think this new tuning will appeal more to general consumers but might leave fans of the original feeling sullied (unless they wished for more fullness).

7Hz x Crinacle Zero 2 freqeuncy response graph

With the 7Hz Zero 2, the bass takes centre stage, embodying a newfound depth and resonance. Its expansion in both sub-bass and mid-bass regions crafts a warmer, more enveloping sound signature. The sub-bass, now richer and more pronounced, lends weight to lower frequencies without overpowering the overall balance. As a result, Zero 2 is now capable of some powerful sub-bass rumble.

Simultaneously, the mid-bass asserts itself with a confident thump that’s controlled and articulate, contributing to a rounder, fuller-bodied rendition. This augmentation in bass quantity doesn’t compromise its poise; instead, it establishes a meaty foundation, underpinning the musicality with a satisfying note weight and depth. Listening to Devin The Dude’s “Briarpatch” (explicit), the Zero 2 goes into party mode as the bass thumps and rumbles.


Amidst the symphony of sonic elements, the midrange of the 7Hz Zero 2 maintains its demeanour while accommodating the bass’s newfound richness. There’s a warmth that permeates through instrumental and vocal timbres, resulting in a natural tonality. The enhanced bass presence seeps into the lower midrange, lending instruments a weightier, more organic resonance.

Vocals are assertive and clear. While they’re not the main focus, they feel real without taking attention away from the instruments playing behind them. This symbiotic relationship between the bass and midrange engenders a warm and emotional presentation.

Zero 2 with stock cable

In the treble, the 7Hz Zero 2 charts a different course, diverging from its predecessor’s emphasis. The treble, characterized by a gentle and smooth demeanour, treads lightly with a moderated presence in the 4kHz to 8kHz spectrum. This results in a more laid-back treble, stepping back from the limelight while still unravelling sufficient details.

Its reserved nature brings forth a mellower, less forward and fatigue-free presentation, without sacrificing clarity. Despite this, the treble shines through, giving tracks some airiness and a hint of sparkle.

Soundstage & Technicalities

Zero 2’s soundstage has moderate dimensions, not particularly wide but offering commendable depth. It performs well in terms of layering and imaging, allowing for good instrument separation and overall resolution. It might not compete with more expensive models in terms of expansiveness, but it’s impressive considering its price point.


7Hz Salnotes Zero
7Hz Zero 2 vs 7Hz Salnotes Zero

The 7Hz Salnotes Zero (review here) has less bass presence and more lift in the 4kHz to 8kHz range. The result is a thinner but more detailed and high-fidelity sound compared to the Zero 2. Salnotes Zero sounds cleaner and more spacious but is also potentially more fatiguing.

The original Zero has less bass depth and more emphasis on vocals. This gives it a more intimate sound and diminished soundstage dimensions. As a result of its reserved bass and added treble, the original Zero has better detail retrieval.

Those looking for fidelity and a more pristine sound will appreciate the original Zero while people looking for some fun and strong bass impact will get a kick (no pun intended) from the Zero 2’s boosted low frequencies.

Moondrop Chu 2
7Hz Zero 2 vs Chu 2

The Moondrop Chu 2 (review here) shares some similarities with the Zero 2 but ultimately sounds quite different. Several factors contribute to these distinctions: a slight reduction in sub-bass presence coupled with added richness in the lower midrange, alongside increased prominence in the 3kHz to 8kHz range.

The result? Chu 2 doesn’t hit as hard in the sub-bass, nor does its metal shells facilitate the same amount of physical rumble. Moreover, Chu 2 has more forward and vibrant vocals while the Zero 2 maintains a more even tonal balance.

These are both great value IEMs. I personally prefer the Zero 2 for its tangible bass impact. However, others might favour the Chu 2 for its more forward vocals, compact metal shells and lower price.

7Hz Crinacle Zero 2 shells


The 7Hz x Crinacle Zero 2 IEM emerges as a delightful addition, offering a more vibrant and engaging sound profile compared to its predecessor. With its tangible bass and added warmth, it delivers a dynamic listening experience that captivates. Much like its predecessor, the Zero 2 is an exceptional value proposition, making it a standout choice for anyone shopping for a budget IEM.

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5 months ago

I wonder how these earphones sound compared to the Venture Electronics Monk Plus.

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