Review: KZ ZSX 1DD+5BA Hybrid HiFi Stereo Earphones - Perfect for Musicians

Published on May 6, 2023, 7:55 p.m.

The market for headphones and earbuds is more competitive than ever, with countless options at every price point. In the budget segment, the erjigo KZ ZSX aims to stand out by offering a hybrid driver setup and detachable cables at an affordable price. In this review, we’ll take a close look at the design, features, sound quality and value of these intriguing wired in-ear monitors (IEMs).
 KZ ZSX 1DD+5BA Hybrid HiFi Stereo Noise Isolating Sport IEM Earphones


The KZ ZSX is a 1DD+5BA hybrid IEM featuring one dynamic driver and five balanced armature drivers per earbud. The shell is made of zinc alloy with a resin interior, giving it a lightweight yet durable feel. The detachable cables allow for easy replacement and upgrading. Key features include:

  • Hybrid 1DD+5BA driver configuration
  • Detachable 0.75mm 2-pin cables
  • Sensitivity: 111dB/mW
  • Impedance: 24Ω
  • Frequency Response: 7Hz-40kHz

Design and Comfort

The angular, faceted design stands out from typical earbud shapes. An over-ear wire helps secure the ZSX in place. The nozzle angle and selection of included eartips allow the IEMs to fit comfortably and securely for most ears. The compact, ergonomic shape makes them suitable for sports and active use.

Build quality feels solid thanks to the metal shells. The detachable cables use sturdy connectors and relieve strain well. The included cable doesn’t transmit much noise. Overall, the design enables all-day listening comfort.
 KZ ZSX 1DD+5BA Hybrid HiFi Stereo Noise Isolating Sport IEM Earphones

Sound Quality

With its hybrid driver setup, the ZSX delivers highly detailed and balanced sound with emphasized treble and bass. The dynamic driver handles low frequencies while the balanced armatures reproduce mids and highs.

Bass has good depth and punch but not overpowering. Mids are clear and vocals sound natural. Highs are crisp and airy. Soundstage has nice width. Imaging lets you pinpoint instrument positions.

Overall, the ZSX performs well above its price range, providing engaging, hi-fi sound. It’s a noticeable upgrade over cheaper earbuds.


The ZSX has standard wired headphone functionality. Playback controls are handled by the audio source device. The optional microphone cable adds call handling but may affect sound quality slightly.

While missing modern features like Bluetooth and active noise cancelling, the ZSX focuses solely on delivering great wired sound. The replaceable cables enhance durability and customization ability.

Use Cases

The ZSX is ideal for:

  • Music listening - The engaging sound brings out details in your favorite tunes.
  • Podcast/audiobook listening - Vocals come through clearly. Good noise isolation.
  • Commuting and travel - Secure fit blocks ambient noise on trains, planes.
  • Workouts - Sweat resistant design and over-ear hooks keep the ZSX in place.

User Feedback Analysis

Reviews for the KZ ZSX are overwhelmingly positive, with most users rating them 4 or 5 stars out of 5. Here are some key points that emerge from hundreds of customer reviews:

  • Sound quality - The most frequent praise is for the excellent sound with impactful bass, clear mids and crisp treble. Many describe the sound as “amazing” and “impressive”. Even audiophiles agree the ZSX performs above its price range.

  • Comfort - Users find the ergonomic shape and selection of eartips allow the IEMs to fit securely and stay in place. They can be worn comfortably for hours. The compact size makes them ideal for active use.

  • Value - Reviewers universally agree these headphones provide incredible value. The advanced hybrid driver design and detachable cables rival much more expensive earphones.

  • Cables - Having detachable, replaceable cables earns praise for making the ZSX more durable and future-proof. Users appreciate being able to upgrade cables.

  • Noise Isolation - Many mention the good seal and snug fit block out ambient noise effectively, making the ZSX suitable for travel and commuting.

While a small minority had issues with harsh treble or poorly fitting eartips, most describe the ZSX as the best earphones they’ve used in this price range. It receives outstanding reviews as a budget headset that punches far above its weight.


  • Great value for a hybrid IEM
  • Impressive soundstage and imaging
  • Good noise isolation
  • Secure and comfortable fit


  • No Bluetooth or noise cancelling
  • Non-removable cables lack modern features
  • Treble may be harsh for some


The ZSX’s sophisticated hybrid driver design provides audiophile-level sound that competitors can’t match at this price point. The replaceable cables and metal alloy housing only add more long-term value.

Reviewers looking for the absolute best sound quality under $100 will be hard pressed to find a better option than the ZSX. The combination of stellar performance, premium materials and useful features creates tremendous value unmatched by other budget earphones. For shoppers prioritizing sound over features, the ZSX is a steal.


With excellent sound, stylish design and replaceable cables, the erjigo KZ ZSX punches far above its budget-friendly price point. Audiophiles will be impressed by the detailed, balanced sound showcasing this hybrid IEM’s technical capabilities. For those seeking wired earbuds with hi-fi performance and quality, the ZSX should be on your shortlist.


  • Driver Configuration: 1DD + 5BA per earbud
  • DD Driver: 10mm dynamic driver
  • BA Drivers: Knowles 33518 for lows, 29689 for mids, 30017 for highs
  • Sensitivity: 111dB/mW
  • Impedance: 24ohms
  • Frequency Response: 7Hz - 40kHz
  • Distortion: ≤1% @ 1kHz
  • Rated Power: 5mW
  • Max Input Power: 20mW
  • Cable Length: 1.2m
  • Plug Type: Gold-plated 3.5mm unbalanced
  • Weight: 5.6g per earbud
  • Included Eartips: 3 pairs (S/M/L) silicone tips
  • Waterproof Rating: IPX4 sweat resistant
  • Warranty: 1 year

Box Contents

  • KZ ZSX earphones
  • 3 sizes of silicone eartips
  • 2-pin 0.75mm detachable cable
  • Manual and warranty card


  1. Select appropriate eartips for fit and seal
  2. Insert IEMs with over-ear hooks going around ears
  3. Attach cable to IEMs firmly until it clicks
  4. Plug 3.5mm connector into audio source
  5. Adjust volume and enjoy your music!
Erjigo KZ ZSX 1DD+5BA Hybrid HiFi Stereo Earphones