Brand: KZ
Category: Audio
  • 1: 5 units of balanced armature earphones
  • 2: Solid ergonomic wear experience
  • 3: Independent sound channel
  • 4: Treble are rich and energetic
  • 5: 3.5mm plug

Our Rating

The overall rating is based on review by our experts

  • Design 9 / 10
  • Features 8 / 10
  • Connectivity 9 / 10
  • Performance 8 / 10

KZ ZS4 HiFi Stereo In-ear Earphone Music Earbuds

After getting acquainted with the products of the company Knowledge Zenith, you understand that we have been taken for many years by our nose. For a good sound is not necessary to spread hundreds of dollars!

We are sure that the name of the Chinese company Knowledge Zenith (or abbreviated KZ) is completely unknown to most of our readers. However, among the enthusiastic music lovers this name is gaining popularity.

Knowledge Zenith has become famous for the fact that its products consistently collect expert reviews, but at the same time it’s like ordinary Chinese peepers.

Packaging KZ ZS4 does not bode well. A small black box with a transparent plastic lid and an incomprehensible pattern on the back side. This is how the packaging of cheap Chinese headphones-plugs should look like.

The delivery package is also not happy with the variety. In addition to the headphones and the connecting cable, the manufacturer provided only a modest kulochek with two spare pairs of silicone ear cups of different sizes.

Materials and assembly

Look KZ ZS4 strange. It’s strange for those people who are used to the traditional streamlined forms of earbuds. The case of the headphones seems too large and angular, even somewhat brutal.

However, the size of the headphones is due to their quality stuffing. The fact is that the KZ ZS4 is a hybrid four-driver headset with two reinforcing and two dynamic drivers. We will not delve into all the subtleties of sound reproduction within the framework of a short review, we only note that this is very cool. Such a system is often used in high-quality professional headphones of a high price category.

Although from the side it may seem that the body is made of metal, in fact it is plastic. And this is correct – excess weight in the ears is useless. By the way, each earphone weighs 4.5 grams.

The cable in this model is detachable. If the wire is damaged, which is known to be the main cause of the failure of portable headphones, it can simply be replaced . Or, if you want, buy a special cable with Bluetooth-module and turn these headphones into wireless ones.

However, the cable looks quite reliable, so it will take a while to replace it. The angled plug is comfortable and durable, the braid is strong, the place of separation of the wires is reinforced with a plastic tee. Everything is simple, convenient and high-quality.

Despite the angular shape, sit in the ears of the KZ ZS4 well. The earpiece is reliably located in the auricle and additionally adheres to a semi-rigid wire that remembers the shape. Therefore, you can use the KZ ZS4 not only in a relaxed environment, but also during walking, running and other sports activities.

Nevertheless, the size of the KZ ZS4 is not suitable for everyone. People with a small ear can experience discomfort or even pain when wearing headphones. Therefore, we do not recommend this model to children.

Sound quality

Headphones KZ ZS4 sound unexpectedly good. And if you look again at the price tag, the hand goes by itself to fix “good” to “excellent.”

The multi-driver scheme used in this model allows to create a bright sound picture with a smooth deep bass, elaborated middle frequencies and correct ones that are not at all rattling high.

Each instrument sounds separate, clean and balanced. The sound remains pleasant even at the highest volume level. The music performed by KZ ZS4 is so transformed that I want to listen to my entire music library for a new one. This, we think, is the best praise for headphones.


After testing the KZ ZS4, it seems that we are confronted with some phenomenon. Well, headphones for 20 dollars can not sound like that! Nevertheless, this is a fact. Under the unattractive packaging and ambiguous appearance, there is a high-quality professional filling, which produces an unmatched sound for this price category.

Model KZ ZS4 – this is an unequivocal must-have for all fans of good sounding, who are not ready to pay hundreds of dollars for the products of advertised competitors.


Product Details

Features ● HiFi earphone, provides a perfect sound effect
● Double unit independent pronunciation, provides you a high-quality music experience
● Lightweight design, wearing more comfortable
● Solid ergonomic wear experience, durable, providing a locked-in fit
● The midbass and treble driver unit have a rich, vigorous performance at bass, midrange and treble, bass, mids and treble are rich and energetic
● Use 3.5mm plug and 0.75mm gold plated 2 pin, with the stylish design and high-end sound quality, designed for iPhone and other smartphones
● Pluggable earphone cable design, replace the KZ original Bluetooth cable to change the Bluetooth headset, Bluetooth cable needs to be purchased separately
Specification Brand: KZ
Function: Answering Phone,HiFi,Song Switching
Material: Metal,PC
Model: ZS4
Type: In-Ear
Wearing type: In-Ear

Application: Sport
Cable Length (m): 1.2m
Compatible with: Computer
Connectivity: Wired
Driver unit: 8mm
Frequency response: 7Hz - 40KHz
Driver type: Hybrid
Impedance: 18ohms
Sensitivity: 101dB

Package size (L x W x H): 10.20 x 7.20 x 3.20 cm / 4.02 x 2.83 x 1.26 inches
Package weight: 0.0800 kg
Product size (L x W x H): 120.00 x 5.00 x 2.00 cm / 47.24 x 1.97 x 0.79 inches
Product weight: 0.0200 kg


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