When I first tried the ISN NEO 1, I wasn’t expecting it to leave such a lasting impression. In a crowded market filled with budget-friendly IEMs, this one stands out - not just because of the price, but because it delivers an experience that feels far beyond its cost. This little in-ear monitor isn’t just good for its price bracket; it’s genuinely excellent. Balanced tuning, organic sound, and a premium build make it a compelling option even when stacked against models that cost significantly more.
ISN NEO 1
First Impressions and Unboxing
The ISN NEO 1 arrives in a compact box with a neat presentation. Inside, you’ll find:
- The IEMs themselves with gorgeous stabilized wood faceplates
- A silver-plated OFC cable with 2-pin 0.78mm connectors and a 3.5mm plug
- A clamshell-style carrying case
- Six pairs of silicone eartips (three green and three orange, in small, medium, and large sizes)
- A shirt clip
- A set of tuning filters (metal mesh, damping mesh, and cotton mesh)
At $39, this is a generous accessory pack. But none of it would matter if the IEMs didn’t sound good. Thankfully, they do-and then some.
ISN NEO 1 Accessories
Craftsmanship and Comfort
Despite being ultra-light at just 4 grams each, the ISN NEO 1 feels anything but cheap. The resin shell is smooth and ergonomically contoured, and the stabilized wood faceplate adds a classy, artisan-like touch. You can barely see the dynamic driver through the translucent housing, but the minimalist look is part of the charm.
Fit and comfort are absolutely top-tier. These IEMs sit securely in my ears with a deep seal, providing excellent passive isolation. I can wear them for hours without fatigue, making them an ideal companion for long listening sessions or commutes.
The included cable is serviceable-light and flexible-but not exceptional. If you have a favorite aftermarket cable, this might be the time to upgrade, especially if you want balanced termination. Still, for the price, I can’t complain.
Sound Performance That Exceeds Expectations
Let’s get to the heart of the ISN NEO 1: its sound.
Bass: Refined and Textured
The first thing that struck me was the bass. The 10mm carbon nanotube driver delivers low-end that’s tactile, punchy, and clean. The sub-bass digs deep and creates a strong foundation without overwhelming the mids. It never feels bloated or slow; instead, it’s articulate and rich in texture.
What I love most is the control and airiness. Even with bass-heavy tracks, it doesn’t bleed into the midrange. Drums feel alive, with clear separation between kicks, toms, and bass guitars. This isn’t bass for bassheads-it’s musical bass, designed to support rather than dominate.
Mids: Natural, Expressive, and Detailed
The midrange is where the NEO 1 truly shines. There’s a slight warmth that gives male vocals a smooth, rich quality, and female vocals come across as emotional and expressive. Instruments like guitars and pianos are rendered with natural timbre and good note weight.
Unlike many budget IEMs, the mids are neither recessed nor overly forward. It’s a balanced presentation that gives the entire mix room to breathe. On well-recorded tracks, the NEO 1 brings out subtle textures and micro-details that I didn’t expect at this price point.
Treble: Airy but Controlled
Treble can often make or break an IEM, especially for those sensitive to upper frequencies. Out of the box, the NEO 1 has a lively top end, with a noticeable presence around 4.5kHz. On some tracks, this peak can sound shouty or sibilant, particularly for treble-sensitive ears.
But here’s the great part: ISN includes a tuning filter kit that lets you adjust the sound signature. Swapping in the damping or cotton mesh filters softens the treble, reducing any potential harshness without dulling the detail. With the cotton filter in place, I was able to enjoy long listening sessions without fatigue.
Custom Tuning with Filters
The NEO 1 comes with three sets of tuning filters:
- Metal Mesh: Adds energy, enhances dynamics and treble sparkle
- Damping Mesh: Balances the sound, improves midrange clarity, and slightly tames treble
- Cotton Mesh: Smooths the top end and warms the entire signature
You can even stack filters (for example, metal on top of cotton) to further tweak the sound. This level of customization is rare in this price range and makes the NEO 1 a great playground for tuning enthusiasts.
Soundstage and Technicalities
The soundstage is surprisingly wide for a single dynamic driver. It never feels artificial but instead expands naturally with the recording. Imaging is clean and layered, with accurate instrument placement and good front-to-back depth.
Resolution and detail retrieval won’t compete with $500 IEMs, of course, but for $39, the performance is impressive. The NEO 1 handles fast, complex passages with surprising grace, maintaining separation and coherence across the spectrum.
Coherency is another strength. Because it’s a single dynamic driver, the tuning feels unified and organic. There are no jarring transitions between frequencies, just a smooth, lifelike presentation that draws me into the music.
Comparison with Other Budget IEMs
To give the NEO 1 context, I compared it to some popular budget sets:
- SIMGOT EW200: More technically proficient with a neutral-bright tuning. The EW200 offers better detail retrieval but lacks the musical warmth of the NEO 1.
- Truthear Zero: Dual-driver setup offers punchy bass, but the tuning can feel thinner and less natural in the mids compared to the NEO 1.
- KZ D-Fi: More V-shaped and clinical. The NEO 1 offers better coherency and a more enjoyable midrange.
- SIMGOT EA500: Better technicalities, but not as engaging. The NEO 1 feels more organic and emotionally resonant.
Overall, the NEO 1 holds its ground against all of these, especially when considering comfort, build, and tuning flexibility.
Who Should Try the ISN NEO 1?
This IEM is not for those chasing ultimate technicalities or a reference tuning. But if you’re looking for:
- A warm, musical, and detailed sound
- Fantastic bass with texture and control
- Expressive vocals and a coherent signature
- Comfort for hours of use
- The flexibility to tune the sound to your liking
Then the NEO 1 is for you.
It’s particularly well-suited for classic rock, pop, EDM, jazz, and any genre where musicality matters more than micro-detail. Treble-sensitive listeners will appreciate the ability to tone down the upper mids with filters. Those who already own ISN’s higher-end IEMs like the Neo5 will find this a brighter, more forward complement.
Final Verdict
The ISN NEO 1 has become one of my favorite budget IEMs-not because it does everything perfectly, but because it nails the things that matter most to me: musicality, comfort, and value.
At $39, it feels like a steal. The tuning is refined, the design is premium, and the extras like the filter kit make it even more appealing. Whether you’re new to the hobby or a seasoned enthusiast looking for something fun and versatile, the NEO 1 deserves a spot in your collection.
It’s rare to find an IEM that makes me reach for it just to enjoy the music-not to evaluate, not to critique, but to simply listen. That’s the highest praise I can give.
Where to Buy
You can find the ISN Neo1 on:
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