Yinyoo Audio provides high quality products for our customers with a keen eye for design and performance. We strive to deliver the better sound quality possible no matter the cost.

KZ ES4 designed with Two Drivers,One dynamic driver and one balanced armarture hybrid to produce amazing treble and bass.

Sound:

• Full bass and slightly smoother treble. Vocals are a tad subdued, with its v-shaped nature.
• Low's, mid's and high's sound clear, good and crisp,well balanced.The bass is good and present.
• The sound is the a close-to-perfect combination of accuracy, fun, detail and power. Put them on and get immersed in music, movie or game!

Appearance:

The overall appearance looks fashionable thanks to the transparent shell combined with the bright colors of resin.

Sound Isolation:

Yinyoo kz es4 using patent technology silicon ear tips, Independent sound channel for each driver,the sound will not be distorted,Bring you a new kind of auditory sense.

Earphones Cable:

1.The es4 twisted cable is improvement over the older KZ cable,flexible and sturdy with a good strain relief and right angle plug.

2.Friendly design and free removable cable design, if the cord breaks you can just replace the cable!

Suitable Music:Good for EDM,popular musics.

Notice:The original appearance of es4 is upgraded,and the performance remains unchanged, During the upgrade period, new and old style will be send out by randomly. Thanks

When you read IEM reviews that when the reviewer gives his/her opinion regarding the sound that there are many factors that shape the final sound an IEM delivers to one's ear.

Those factors include:

1 - Shape and size of the reviewer's ear canals. (shallow or deep, wide or narrow)

2 - Shape and size of the eartips [round or cone, single, double or triple flange] & proper fit

3 - Materials of the eartips (silicone/foam)

4 - Shape of the IEM (and/or angle of the nozzle) can cause fitment issues for some.

5 - Source (quality of smartphone, laptop, digital audio player) is amplified/unamplified.

6 - The IEM itself (driver flex possible due to trapping air in canal causing muffled sound.

7 - The Reviewers ability to hear all frequency ranges (age plays a factor).

How to Wear?

Q&A

Complaint: These earphones have no BASS! I should have bought anything else.

Answer: 1.A proper seal is important to get good based from IEMs. Somebody were able to get a good seal with the rubber tips. If want to get more better isolation and bass response, you can try the foam tips on earbuds. (5mm Comply foam tips).

2. If you want more better sound, recommend running these headphones through some type EQ software or what have you.

Complain: These headphones won't stay in my ears.

Answer: Part of the cord is the "hold shape" type cord for a reason. if you have it "hanging" down from your ears you are wearing the earphones incorrectly. You probably need to swap the L and R cables... now get the cable so it exits the earphone "upwards" towards the top front of your ears. the "hold shape" cord will then wrap around the top of your ears. This is a very "stable" shape. and will hold even during rigorous activities.

Complain: Detaches from earbud

Answer: You probably can try to swap the L and R cables.