Yinyoo Hybrid Earphones KZ ZST Balanced Armature+Dynamic Dual Driver Stereo in Ear Headphone HiFi Bass Headset in-Ear Earphones (No mic, Black)
Want the best price and purchase timing?
Our AI advisor analyzes real-time pricing across all channels to find you the best deal.
AI Verdict
These 2.08-ounce hybrid dual-driver wired in-ear monitors deliver a V-shaped sound with punchy bass and clear highs for under $20.
The KZ ZST offers a lightweight, over-ear design that many find comfortable for shallow insertion. However, the included ear tips are a common point of contention, often failing to provide a secure fit or adequate seal, which directly impacts both comfort and sound quality.
If fit and isolation are paramount, look for IEMs that explicitly mention a wide range of included ear tip materials and sizes, or consider models known for excellent passive noise isolation.
Regret Score™
Very High RiskLower is better — measures purchase-regret risk from real buyer complaints, review credibility, and product maturity
Issues discovered after purchase
Critically weak dimension
Amazon rating vs actual quality
Chance this product isn't for you
Pros
- Features a hybrid driver design with a 10mm dynamic driver and a balanced armature driver for distinct frequency reproduction.
- Produces a V-shaped sound signature with elevated bass and bright, detailed highs.
- Offers good instrument separation, allowing individual elements in complex tracks to be heard clearly.
- Lightweight design and over-ear wearing style contribute to comfortable, shallow insertion for many users.
- Detachable 2-pin cable allows for easy replacement if damaged or for aesthetic upgrades.
Cons
- Stock ear tips are often described as flimsy, uncomfortable, and may not provide an adequate seal for all users.
- The included cable can be sticky and prone to tangling, with some users disliking its 'memory wire' style.
- Mids can sound slightly scooped, potentially reducing the body of certain instruments and vocals.
- Sound isolation is not exceptional, and audio bleed can occur at higher listening volumes.
- Plastic shells are susceptible to scratches and the metal screens on the bores have been reported as poorly glued in some units.
Dimension Scores
The hybrid driver design delivers a V-shaped sound with punchy bass, clear highs, and good instrument separation, which is above average for its price point.
Despite being 'sound isolation' type, user reports indicate less isolation than some competitors and noticeable sound bleed at higher volumes.
The lightweight, over-ear design is generally comfortable, but the frequently criticized stock ear tips often necessitate replacement for optimal fit and seal.
As wired earphones, this product has no battery and therefore no battery life to score.
Best For
- Budget-conscious listeners seeking a fun, energetic sound profile with emphasized bass and treble.
- Casual music enjoyment where a detailed, V-shaped sound is preferred over a neutral response.
- Users who appreciate the option to easily replace or upgrade their earphone cables.
Not Recommended For
- Critical listening or audio mixing where a flat, neutral frequency response is required.
- Environments requiring high levels of passive noise isolation or privacy due to sound bleed.
- Users prioritizing premium build materials and long-term scratch resistance.
Watch Out For
- The stock ear tips often fail to provide a secure or comfortable fit, leading many users to purchase aftermarket tips for better seal and comfort.
- Some units have reported issues with the metal screens in the earphone bores being poorly glued, raising concerns about long-term durability.
- Despite the 'sound isolation' feature, these earphones can bleed audio at high volumes, making them unsuitable for quiet shared spaces.
- The included cable is frequently criticized for being sticky and having an undesirable 'memory wire' characteristic.
Full Specifications
| UPC | 611517423161 |
| ASIN | B06WVFLYZF |
| Brand | YINYOO |
| Color | dark-black |
| Style | without mic |
| Material | Plastic |
| Impedance | 18 Ohms |
| Model Name | KZ ZST |
| Form Factor | In Ear |
| Item Weight | 2.08 ounces |
| Control Type | Media Control |
| Manufacturer | Yinyoo |
| Cable Feature | Detachable |
| Ear Placement | In Ear |
| Noise Control | Sound Isolation |
| Control Method | Touch |
| Earpiece Shape | Rounded tip |
| Headphones Jack | 3.5 mm Jack |
| Number of Items | 1 |
| Special Feature | Lightweight, Noise Cancellation, Sports & Exercise |
| Audio Driver Type | Hybrid Driver |
| Item model number | zst |
| Compatible Devices | Devices with a 3.5 mm jack |
| Frequency Response | 20000 Hz |
| Hardware Interface | 3.5mm Audio |
| Product Dimensions | 3.54 x 2.76 x 1.18 inches |
| Included Components | Cable, Eartip |
| Input Device Interface | Audio jack |
| Water Resistance Level | Not Water Resistant |
| Age Range (Description) | Adult |
| Connectivity Technology | Wired |
| Specific Uses For Product | listen to music |
| Recommended Uses For Product | Exercising |
| Supports Bluetooth Technology | No |
| Is Discontinued By Manufacturer | No |
| Wireless Communication Technology | Wi-Fi |
What Buyers Say
Users consistently highlight the KZ ZST's surprisingly detailed and energetic sound for its low price, often comparing it favorably to more expensive options. The V-shaped sound signature, with its emphasized bass and bright treble, is a recurring point of praise, especially for genres like rap and rock. However, the included ear tips are almost universally disliked for their poor fit and comfort, leading many to recommend immediate replacement. The detachable cable is a welcome feature, though the stock cable itself receives criticism for being sticky.
“Dude, for like twenty bucks, these things sound wild, way better than they should. But seriously, toss those ear tips they come with, they're garbage, and get some better ones, then you're set.”
Common Praise
- Sound is clear and detailed, especially for the price.
- Bass has satisfying weight, impact, and punch without excessive bleed into the mids.
- Highs are bright and sparkly, often without being fatiguing due to a dip in the sibilance range.
- Good instrument separation, making it easier to distinguish individual sounds in music.
- Lightweight design and over-ear wearing style contribute to comfortable use for many.
Common Complaints
- Stock ear tips are flimsy, uncomfortable, and often fail to provide a proper seal.
- Included cable is sticky, prone to tangling, and has an undesirable 'memory wire' effect.
- Mids can sound somewhat recessed or 'scooped,' impacting the body of certain instruments.
- Sound isolation is not strong, and audio can bleed out at higher volumes.
- Plastic build can feel cheap and is susceptible to scratches, with some reports of poorly glued metal screens.
Ownership Tips
- Expect to immediately replace the stock silicone ear tips for improved comfort and sound seal.
- The detachable cable means you can easily upgrade to a higher quality or more comfortable cable if the stock one bothers you.
- The V-shaped sound signature might require some EQ adjustment if you prefer a more neutral sound profile.
- Be mindful of listening volume in quiet environments, as sound bleed is a known characteristic.
- The plastic shells, while lightweight, will show scratches over time with regular use.
Frequently Asked Questions
Do these earphones have a microphone?
The product title specifies 'No mic', but the product description mentions 'with mic/without mic' options and details about an in-line mic. User reviews for the ZST line often mention a microphone, but its quality is generally reported as poor.
What kind of sound signature do these earphones have?
They have a V-shaped sound signature, meaning the bass and treble frequencies are emphasized, while the mid-range is slightly recessed. This results in a punchy bass and clear, bright highs.
Are the cables detachable?
Yes, the KZ ZST earphones feature a detachable 2-pin cable, allowing for easy replacement or upgrade.
Are these comfortable for long listening sessions?
Many users find them lightweight and comfortable due to their over-ear design and shallow insertion. However, comfort can be significantly improved by replacing the stock ear tips with aftermarket options.
Do these provide good noise isolation?
While they offer some sound isolation, it's not considered exceptional. They can also bleed sound at high volumes, so they might not be ideal for very noisy environments or quiet shared spaces.
Buying Guide
When you're looking at in-ear monitors like these, you're basically choosing how sound gets delivered directly into your ear canal. Unlike over-ear headphones, IEMs aim for a snug fit to block out external noise and deliver sound directly. The 'hybrid driver' thing means it's got two different types of speakers inside each earbud working together to handle different parts of the sound spectrum. This usually means you get a more detailed sound than with just one type of driver.
Hybrid Driver (Dynamic + Balanced Armature)
Think of it like a car with two engines, each optimized for a different task. The dynamic driver is usually better at producing deep, impactful bass, like a subwoofer. The balanced armature driver excels at clear, precise highs and mids, like a tweeter. Together, they try to give you the best of both worlds across the entire sound range.
Impedance (18ohm)
This number tells you how much electrical resistance the earphones have. A lower impedance (like 18 ohms) means they're easier to drive, so your phone or a basic music player can power them sufficiently without needing a dedicated amplifier. Higher impedance headphones usually need more power to sound their best.
Sensitivity (106dB/mW)
This spec indicates how loud the earphones will get with a given amount of power. A higher sensitivity number means they'll play louder at the same volume setting on your device. 106dB/mW is quite sensitive, meaning these will get plenty loud even from a smartphone.
Alternatives
If this model doesn't fit, look for IEMs with a more neutral sound signature if you prioritize accuracy, or models with a focus on passive noise isolation if you need to block out more external sound.
You Might Also Like
Beats Studio Pro - Wireless Bluetooth Noise Cancelling Headphones with USB-C Charging Cable (20 cm) - Jet Black
$150-$299A Bluetooth headphone with Active Noise Cancelling, USB-C lossless audio, and a 28-hour battery, but with reported comfort issues.
![Samsung Galaxy Buds 4 Pro (2026) AI True Wireless Bluetooth Earbuds, Hi-Res Audio, 2-Way Speaker, ANC 2.0, Optimized Comfort, IP57, Live Translation, Black [US Version, 2 Yr Warranty]](https://m.media-amazon.com/images/I/51QEHqsjzPL._AC_SL1500_.jpg)
Samsung Galaxy Buds 4 Pro (2026) AI True Wireless Bluetooth Earbuds, Hi-Res Audio, 2-Way Speaker, ANC 2.0, Optimized Comfort, IP57, Live Translation, Black [US Version, 2 Yr Warranty]
$150-$299These are 2.05-ounce true wireless earbuds with 2-way speakers and ANC 2.0, designed for Samsung ecosystem users prioritizing audio quality and adaptive noise cancellation.
Trucker Bluetooth Headset, Wireless Headsets with Noise Cancelling Microphone, Long Battery Life Bluetooth Headphones with Detachable Earpad/Single+Dual Mode for Office/Driving/Home
$0-$49A 50-hour battery life, passive noise-cancelling microphone, 13.7-ounce over-ear headset with detachable earpad for office or driving.
Logitech H390 Wired Headphones with Mic, USB-A Headset with Microphone for PC, Noise Cancelling Microphone for Video Meetings, Music, Gaming - Black
This is a 7-ounce, wired USB-A over-ear headset with a rotating noise-cancelling mic, built for basic PC communication.