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Black in-ear earphones with L-shaped 3.5mm plug and 1.2m cable

KZ Earphone

KZ ZST Hybrid Dual Driver Earphones Black 3.5mm 1.2m 18Ω 108dB 20-20000Hz

SKU CH-ZYJ2-QBV65

Hybrid balanced-armature and dynamic drivers deliver 108 dB sensitivity across 20–20,000 Hz via a replaceable 1.2 m cable with 3.5 mm L-plug

  • Wearing styleIn the Ear
  • Product colorBlack
  • Product typeBluetooth Headset
  • Hybrid driver design delivers detailed sound with deep bass
  • 18 Ω impedance suits portable devices without extra power
  • 108 dB sensitivity provides loud, clear audio from low-power sources
  • 20–20 000 Hz range covers full audible spectrum
  • Detachable 1.2 m cable with gold-plated 3.5 mm plug allows easy replacement

What the KZ ZST delivers

The KZ ZST hybrid dual-driver earphones combine a balanced-armature and a dynamic unit in an in-ear shell. They connect through a gold-plated 3.5 mm L-shaped plug and a 1.2 m detachable cable. The 18 Ω impedance and 108 dB/mW sensitivity make them easy to drive from portable sources. Listeners who want a wired, replaceable-cable IEM for critical listening will find the specification a match.

Thermals noise and power in daily use

Passive operation means no battery, no active circuitry and no self-generated heat during normal listening. The in-ear seal provides physical isolation rather than electronic noise cancellation, so ambient sound is reduced without added hiss. Power draw is limited to the signal voltage from the source device, keeping the load negligible for smartphones or DAPs. The lightweight build stays comfortable for extended sessions.

Behaviour under sustained load

The hybrid driver handles continuous playback across the 20 Hz to 20000 Hz range without thermal compression because there is no active amplifier to overheat. The balanced-armature unit maintains clarity in the upper registers while the dynamic driver sustains low-frequency output during long tracks. Detachable cables allow quick replacement if a lead wears out, preserving long-term usability. The design has no duty-cycle limit beyond the source device battery life.

How it compares

Measured against everything we stock in Bluetooth Earbuds & Headsets, at today’s prices. Recalculated every night.

Price $43.99
Pricier than about 65% of the 870 comparable items (median $30.99).

Specifications

Product
Model name1-Bay
Product colorBlack
Product typeBluetooth Headset
Audio & video
Noise cancellationYes
Wearing styleIn the Ear

Questions about this item

How do I install the KZ ZST earphones and which step is often done incorrectly?

Insert the 3.5 mm gilded L-curved plug fully into the device jack; the common error is leaving it partially seated, which cuts one channel or adds noise.

What maintenance or replacement will the KZ ZST earphones need later?

The cable is user-replaceable; swap it when the 1.2 m lead shows wear or the connectors loosen, and clean the ear-tips regularly to maintain seal.

What limit appears first on the KZ ZST during sustained high-volume use?

The 18 Ω impedance draws more current from portable sources, so the player’s output stage typically hits its voltage limit before the drivers reach their 108 dB/mW sensitivity ceiling.

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