HarmonicDyne Devil Review

HarmonidDyne Devil review featured

This is my review of the HarmonicDyne Devil IEMs. The Devil features two 10mm dynamic drivers and aluminium shells. It’s priced at $199.

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

HarmonicDyne Devil Review
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Authoritative controlled bass
Detail retrieval
Build quality
Great unboxing experience
Bass might be too light for some
Long nozzle length not ideal for comfort
Our Score

HarmonicDyne Devil

  • Driver: dual 10mm dynamic driver
  • Impedance: 5Ω±20%
  • Earphone sensitivity: 123dB/Vrms@1KHz
  • Frequency range: 5-40000Hz
  • Distortion rate: 0.057%@1KHz 94dB SPL
  • Shell material: 7075 aluminium alloy
  • Connector: MMCX
What’s in the Box
  • HarmonicDyne Devil IEMs
  • Detachable MMCX cable
  • HarmonicDyne coin
  • Semi-rigid carrying case
  • 6.35mm adapter
  • 3x pairs of wide-bore silicone eartips
  • 3x pairs of narrow-bore silicone eartips


The HarmonicDyne Devil boasts sleek aluminium shells finished in a stylish matte grey. The raised faceplate features a vent on each of its three sides, while an additional pinhole vent is located near the nozzle’s base.

Unlike many of the latest Chinese IEMs, the Devil is equipped with MMCX sockets instead of the more common 2-pin type.

The shell bodies are of average size, but with fairly long nozzles. Personally, I found that using shallow wide-bore tips offered the best fit, and even during prolonged listening sessions, the Devil remained comfortable.

The cable has a braided fabric cover and is available with either a 3.5mm or 4.4mm termination. It handles fairly well in terms of comfort and microphonics but I found it gets tangled fairly easily.


The HarmonicDyne Devil has a finely tuned and balanced sound signature that leans towards neutrality with a subtle elevation in the upper midrange. The clarity is exemplary, imparting a natural, lifelike timbre that envelopes the listener in a richly detailed soundscape. The soundstage is expansive and remarkably stable, providing an immersive and engaging listening experience.

The Devil’s imaging is good, rendering every instrument and vocal with clarity and precise placement. Its remarkable instrument separation is impressive, creating a nicely delineated and dynamic audio canvas, with each sound occupying its own distinct space against a black backdrop.

HarmonicDyne Devil frequency response

The HarmonicDyne Devil’s dual dynamic drivers deliver a bass response that is both commanding and articulate, with impressive control and precision. The bass notes have a confident and authoritative presence, reaching deep into the sub-bass region with satisfying power and extension. The mid-bass is defined and layered, providing a solid foundation for the natural and well-balanced midrange and high frequencies.

The Devil’s bass remains nicely integrated with the overall sound signature, maintaining a distinct and defined presence without overpowering or overshadowing the mids and highs. This is a bass that stays true to its own zone while acting as a dynamic and supportive force that underpins the entire musical performance.

HarmonicDyne Devil with carrying case

The midrange of the HarmonicDyne Devil IEMs is characterized by neutral note weight and impressive clarity. Although there is a slight warmth carried over from the bass, the midrange is free of any smearing, ensuring that vocals and instruments remain clear and distinct. A noticeable boost in the upper midrange adds brightness and brings female vocals to the forefront. Despite the lift between 2kHz-4kHz, the Devil doesn’t sound shouty or harsh, at least to my ears.

Furthermore, the raised upper mids contribute to the sense of presence and air in the sound, creating a spacious and immersive listening experience. Overall, the midrange on the HarmonicDyne Devil IEMs is well-balanced and accurately reproduces the nuances and details of the music. Some might wish for a little extra warmth but others will appreciate the vibrancy here.


The treble is light and airy with a bit of sparkle. It helps add width to the soundstage and puts some vigour into the Devil’s transient attacks. The treble’s ability to emphasize these attacks can make the music sound more dynamic and engaging.

It reveals small nuances and provides positional cues that can make the music sound more lifelike. The treble is detailed and can bring out subtle textures and tones in the music, making it a nuanced and layered experience.


Olina SE design
Tripowin x HBB Olina SE
HarmonicDyne Devil vs Tripowin Olina SE
HarmonicDyne Devil (red) vs Tripowin x HBB Olina SE (black).

The Olina SE (review here) has a similar frequency response with a couple of notable differences. It has a little extra bass response, especially in the sub-bass region which gives it thicker notes. Despite having less bass quantity, the Devil’s bass feels more powerful but reserved at the same time.

Both IEMs are fairly similar in the midrange but the Olina SE has a little more body and warmth. Olina SE adds a focus on the lower treble and presence region while the Devil has more upper treble energy. The Devil has a slightly larger soundstage and better detail retrieval. Overall resolution is similar on both models.

I like both of these IEMs but considering how much cheaper the Olina SE is, the Devil starts to look overpriced. I think the HarmonicDyne has better technical performance but is it enough to warrant the extra cost?


In summary, the HarmonicDyne Devil IEMs are well-designed with sleek aluminium shells and solid build quality. The balanced sound signature with expansive soundstage and impressive stability offers an engaging listening experience.

The bass response is commanding, the midrange is neutral, and the treble is detailed. However, some listeners may prefer more warmth in the midrange. Overall, the HarmonicDyne Devil is a solid IEM but at its current price, few will be willing to take a gamble on it.

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