KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

Knowledge Zenith (KZ) should already be familiar with one or the other reader of my blog. KZ is an Asian manufacturer of earphones that specializes in cheap and good earphones.

Of course, many manufacturers are always promoting “cheap and good”, but in the case of a Hybrid earphone, this really applies. Many earphones from this manufacturer fight in much higher price ranges than their purchase price suggests.

So, of course, I was also looking forward to the new KZ ES4 HiFi Hybrid earphone. The KZ ES4 in our review is the current top model of KZ. For this top model, the manufacturer has come up with something new, several drivers.

KZ ES4 HiFi Hybrid In-ear Earphone Wired Earbuds

Price: $17.00 until the end of June 4th

Cable length: 1.23m, Frequency response: 20-40KHz, Impedance: 25ohms, Sensitivity: 104dB, Plug Type: 3.5mm

KZ ES4 HiFi Hybrid In-ear Earphone Wired Earbuds

Price: $17.00 until the end of June 4th

Cable length: 1.23m, Frequency response: 20-40KHz, Impedance: 25ohms, Sensitivity: 104dB, Plug Type: 3.5mm

It’s not uncommon for earphones to have multiple drivers, but with the ES4, KZ equals four drivers per earphone! Two of these drivers are also a bit more exotic Balanced Armature drivers, which are otherwise primarily found in extremely expensive earphones.

I think, but I forgot to mention the best, the HiFi Hybrid earphone KZ ES4 price is just $17! Let’s take a look at the test to see if the KZ ES4 are convincing and how well they beat themselves compared to the competition!

KZ ES4: Specifications

KZ ES4: Specs
Impedance: 25 ohms
Cable Length: 1.23m
Driver unit: 10mm
Sensitivity: 104dB
Connections: 3.5mm audio jack
Weight: 40 grams
Function: HiFi
Price: $17

KZ ES4: Design and Appearance

At first glance, the KZ ES4 in the analisis look very appealing! The earphones have a relatively large housing, which has a very edgy and I think modern shape.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

Based on the product images, I was not sure at first whether the case might not even be made of aluminum, but this is not the case!

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

KZ uses aluminum cases on many of its earphones, but not on the ES4.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

Qualitatively the housing of the earphones is “Okay”. It looks functional but is also not a high craftsmanship.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

The cable of the KZ ES4 is interchangeable. Here, KZ even uses a “standard” plug, so getting a spare cable should be possible. KZ Audio also offers a Bluetooth Upgrade Kit for just $10.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

The enclosed cable offers a good standard quality. I already had some KZ earphones and the cables were always unproblematically.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

Depending on which version you have chosen, the KZ ES4 also have a wired remote control and a microphone. I saved myself the extra charge here.

KZ ES4: Comfort to Use

The KZ ES4 in our test are quite large earphones, so the wearing comfort can be a bit “tricky”.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

In itself, the ES4 is at least for my ears quite well and ergonomically shaped. For a better grip, KZ also relies on a “cable over ear” design. The ends of the cable of the earphones are reinforced with wire, so they can bend over the ear in shape.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

I found this a bit annoying with the KZ ES4. Although the ES4 are sitting quite well and also firmly in the ears, nevertheless I would rate the wearing comfort for 4.

KZ ES4: Sound

Before we come to the sound a few words to build. KZ uses a whopping eight driver units in the KZ ES4!

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

Here, however, KZ seems to be a bit tricky, it seems to be four drivers per earphone and not 2x eight. Marketing material is always referred to as “Four Dynamic and Four Balanced Armature Driver Units”.

These drivers are 2x10mm dynamic drivers, 2×6.4mm dynamic drivers, 2×30095 Tenor Armature drivers and 2×1205 Tenor Armature drivers.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

Overall, KZ ES4 in our analisis has four dynamic drivers and four Armature drivers. Dynamic drivers are the classic driver units found in speakers and in 99.9% of all headphone/earphones.

Armature drivers are exotic. These drivers have a completely different structure and rely on a vibrating metal armature for sound generation.

Here is a picture of the structure of such an Armature driver:

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

These drivers are much more complex and expensive to manufacture and therefore only $200+ earphones reserved until a few years ago.

Are Armature drivers better? Yes, these are different and generally can represent heights better and more precisely. Basses are not the strength of these drivers.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

Therefore, a hybrid model of KZ ES4 in the test is often used in which normal dynamic hybrid drives earphone are coupled with Armature drivers. The Armature drivers take care of the treble and dynamic drivers around basses and mids.

Something similar here, KZ earphones writes best specifically that the 10mm is used for the bass.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

Let’s put it that way the KZ ES4 hybrid electrostatic headphones sound fantastic, but I think the four drivers are a little over the top.

Let’s start at the beginning, the heights. The ES4 has very clear and brilliant highs, which are also very well resolved. Although the earphones here and there tend a little too “hiss”, especially with sharp S-sounds, that’s already criticism on a very high level.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

In general, the heights are insanely good for earphones under $100 price range. Especially if you like brilliant and clear heights.

The mids are good and natural. I notice no noticeable emphasis or subsidence here. The KZ ES4 is almost completely neutral here. Positive, the ES4 are incredibly well resolved right in the middle!

The same applies to the bass. This may be slightly raised, but otherwise behaves quite naturally. Of course, this does not mean it’s weak, that’s not the case, but there’s no unnatural boost to artificially thicken the “beat”. If the song requires it, but the ES4 provides a strong bass! If the song does not require strong bass, it will not try to create one artificially.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

The bass offers a high degree of precision and a high degree of detail. However, the bass has a small weakness, the volume and depth are rather mediocre. My tip, the case of the KZ ES4 of hybrid earphone driver is just so crammed with drivers, that the individual drivers have a relatively small body.

Although it is always something “easy” to refer to the price of just $20, quite honestly I heard more than enough $100+ earphones with a MUCH worse sound.

At the same time, we have not even talked about the true strength of the KZ ES4! These still have an ace up their sleeve, namely the resolution and the stage.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

The sound of the KZ ES4 is not only generated by a driver and you can hear it in a certain way.

The sound is simply “different” and if you do not know why it’s hard to interpret what’s different with your finger. Between voices, beat and various instruments there is a high separation in the ES4.

I mean that positively! You can hear many songs that not all sounds/instruments come from the same driver. Especially when individual instruments are located in different frequency ranges, this is noticeable.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

This gives the sound a certain naturalness and plasticity since even at a concert not all sounds come from an instrument.

The same effect gives the KZ ES4 an incredibly deep and quite wide stage.

As a result, you can lose a great deal of the KZ ES4 sound, especially when you enjoy high-quality music.

KZ ES4: Conclusions and Reviews

To buy! Otherwise, my recommendation for the KZ ES4 cannot be canceled in our review. Although the processing quality of the earphones is worse than many other KZ earphones, this more than compensates for the sound.

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

The KZ ES4 sounds fantastic! And I do not mean that only in relation to the price. The ES4 offer a natural to a slightly fun suit, which also has a large stage and great resolution thanks to four driver units per earphone.

Although the ES4 may not be the optimum for “bass heads”, but for all users who value a particularly detailed and high-quality sound, the ES4 is pretty much the best I’ve heard in a long time!

KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?

I also like the KZ ES4 better than the Xiaomi Hybrid Pro in terms of sound and even compared to the $100 1MORE Triple Driver is not a clear winner.

The KZ ES4 HiFi Hybrid earphone definitely fights in the $100+ price range and this with a purchase price of just $17. Simply impressive!

KZ ES4: Price and Where to buy cheaper?

At the moment you can buy KZ ES4 HiFi Hybrid earphone at the low price for only $17 until the end of June 4th. In fact, this is a good offer for quality headphones in 2018.

KZ ES4 HiFi Hybrid In-ear Earphone Wired Earbuds

Price: $17.00 until the end of June 4th

Cable length: 1.23m, Frequency response: 20-40KHz, Impedance: 25ohms, Sensitivity: 104dB, Plug Type: 3.5mm

KZ ES4 HiFi Hybrid In-ear Earphone Wired Earbuds

Price: $17.00 until the end of June 4th

Cable length: 1.23m, Frequency response: 20-40KHz, Impedance: 25ohms, Sensitivity: 104dB, Plug Type: 3.5mm

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KZ ES4 Review: Reliability is it about earphones Knowledge Zenith? was last modified: May 28th, 2018 by Boby Sanburn

3 thoughts on “KZ ES4 Review: Reliability is it about earphones Knowledge Zenith?”

  1. I dont understand “you can lose a great deal KZ ES4 Sound especially when you enjoy high quality music.” So if i enjoy high quality music shouldnt i buy these?

    1. They are supposedly really good – this is just nonsensical English. Check out some other reviews, notably the phonograph

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