KZ D-Fi Review

KZ D-Fi review featured

In this review, I’m looking at the KZ D-Fi earphones. The D-Fi features metal alloy shells and 10mm dynamic drivers. There are 2 versions: 1 with tuning switches and one without. I received the switch version. The price is $21.

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

KZ D-Fi Review
The KZ D-Fi is yet another great budget IEM from the well-known brand.
Add your rating here!8 Votes
Mature, balanced sound signature
Tight bass control
Good detail retrieval
Angled 2-pin connectors may cause some fit issues (depends on your ear shape)
Not for bassheads
Our Score



Driver: 10mm dynamic driver
Impedance: 29Ω-48Ω
Sensitivity: 110±3dB
Frequency response: 7-45000Hz


The D-Fi boasts polished metal alloy shells, exuding a premium feel for a $20 IEM. The faceplates feature a striking divot shape, adding a touch of visual flair. Additionally, vents on the lower part of the faceplate and near the nozzle base aid in sound optimization.

For the tuning version, KZ has incorporated four tuning switches at the back of the shells. Although KZ claims there are 16 sound profiles, it’s important to note that these switches primarily adjust the bass level, offering a range of approximately 4dB variation in the bass response.

In terms of comfort, the shells proved to be quite accommodating for my ears. However, I did encounter an issue with the stock cable. The angled connector housings on the cable pushed the IEMs forward, compromising the fit’s stability. Thankfully, this was resolved by switching to a different cable, though results may vary for others.


Gear used for testing includes the xDuoo XP-2Bal, Shanling M5s and Hidizs XO. D-Fi is an efficient IEM and doesn’t have any special power requirements to perform optimally.

In the realm of sound, the KZ D-Fi IEM carves its path with a gentle touch of warmth, subtly veering away from absolute neutrality. Let’s delve into its sonic profile, unveiling its prowess across three pivotal sections: bass, midrange, and treble.

KZ D-Fi frequency response graph

D-Fi boasts a commendable full-bodied bass that resonates with depth, reaching into the heart of each note. However, unlike some bass-centric offerings, the D-Fi maintains an air of neutrality in its quantity, abstaining from overwhelming the overall balance.

This restraint grants the low-end a sense of control and precision, making it an ideal companion for various genres, whether it be the pulsating rhythms of electronic beats or the rhythmic thumps of acoustic melodies.


Stepping into the midrange domain, the D-Fi takes centre stage, with the vocals and instruments occupying a forward and prominent position. This forwardness injects an intimacy to the sound, rendering each vocal nuance and instrument’s timbre with richness. The midrange’s captivating presence captures the listener’s attention, making for an immersive and emotionally-engaging sonic experience.


In the upper frequencies, the D-Fi displays a certain smoothness, with a gentle roll-off in its treble presentation. This characteristic imparts a sense of ease to the overall sound signature, ensuring the listener’s ears remain unburdened by sharp peaks or harsh sibilance. The treble’s softer touch takes away any hint of sharpness, allowing for hours of fatigue-free listening without sacrificing the essence of the musical details.

Soundstage and Technical Performance

The KZ D-Fi showcases a reasonably large soundstage, particularly excelling in height, with a naturally rounded shape. Instrument separation is commendable, aided by its near-neutral tone. However, imaging falls within average standards.


7Hz Salnotes Zero
KZ D-Fi vs 7Hz Zero
KZ D-Fi (red) vs 7Hz Salnotes Zero (black).

The 7Hz Salnotes Zero (review here) is another single dynamic driver IEM. It has a very similar tuning to the D-Fi but there are a couple of subtle differences. Zero has just a tiny bit less weight in its bass, giving it leaner notes.

The Zero has a more subdued upper midrange but vocals still sound just as forward as they do on the D-Fi, due to Zero’s bass attenuation. Zero also has just a hint more treble energy, giving it a slight edge in detail retrieval, while the D-Fi sounds a tad warmer and more relaxed. Both of these IEMs offer outstanding performance for the price.

KZ D-Fi (red) vs KZ ZVX (black).

The KZ ZVX (review here) is also a single dynamic driver IEM. It has more bass and treble energy than the D-Fi, resulting in a more dynamic and fun presentation. The extra bass gives it extra sub-bass rumble and more body in the lower midrange.

The ZVX’s mids are not as forward, opening up its stage and creating larger dimensions than the D-Fi. The ZVX has some added treble presence which gives it a similar level of detail retrieval as the D-Fi, despite of its extra bass girth.

Both of these IEMs are excellent value for money. The ZVX will suit those who crave a bit more meat on the bass bones and a spacious stage while those who prefer upfront and intimate vocals might prefer the D-Fi.


In conclusion, the KZ D-Fi IEM delivers a refined and mature tuning, showcasing commendable bass depth and control while maintaining a sense of neutrality. Its forward midrange and captivating vocals create an immersive and emotionally-engaging listening experience.

The smooth treble with a gentle roll-off ensures fatigue-free listening without compromising musical details. Its reasonably large soundstage and commendable instrument separation, make it a worthy companion for various genres and a compelling choice for music enthusiasts seeking an engaging and balanced sonic experience. Overall, I think the D-Fi is another excellent budget option from KZ and I would readily recommend it.

Stay in the Loop with the Latest News and Updates!

We don’t spam! Read our privacy policy for more info.

Founder of Prime Audio
Notify of

Oldest Most Voted
Inline Feedbacks
View all comments
Cássio Fernando Brito de Souza
Cássio Fernando Brito de Souza
9 months ago

Really an awesome value, just bought mine!

Cássio Fernando Brito de Souza
Cássio Fernando Brito de Souza
9 months ago
Reply to  David Becker

I saw your 7hz zero review too and bought it, I really like the reviews and tuning graphs!
You also did some reviews on some fosi dacs, what do you think of fosi audio k5 pro?

Subscribe to Our Newsletter

Stay in the Loop with the Latest News and Updates!

We don’t spam! Read our privacy policy for more info.