KZ ZSX: hybrid in-ear monitors for bass players and drummers
The KZ ZSX are wired hybrid in-ear monitors: each earpiece combines a 10 mm dual-magnet dynamic driver with five balanced armatures in a resin shell with a zinc alloy faceplate. Available in cyan and black, with or without a microphone.
They are designed for musicians who want to hear themselves clearly in rehearsal and on stage. They combine balanced armatures with a dynamic driver that gives body to the bass guitar and kick drum, so they are a good option if you play bass or drums.
They are worn with the cable over the ear so they stay put while you play, and the 2-pin cable is detachable: if it breaks, you replace the cable, not the earphones. By sealing the ear canal with the ear tips they reduce the noise of the rehearsal room, so you don't have to turn the volume up as much to hear your part. They plug into an IEM bodypack, the headphone output of the mixing desk or your phone through a 3.5 mm jack.
- 6drivers per earpiece: 1 dynamic and 5 armatures
- 24 Ωimpedance
- 111 dBsensitivity
- 7 Hzto 40 kHz frequency response
Sound
Sound: 1 dynamic driver and 5 balanced armatures
Each earpiece houses a 10 mm dual-magnet dynamic driver for the bass and five balanced armatures for the mids and treble. KZ highlights deep bass and plenty of high-frequency detail.
With an impedance of 24 Ω and a sensitivity of 111 dB, they run straight from a phone, laptop or music player, with no amplifier needed.
Design
Design and fit
The shell is resin, with a zinc alloy faceplate and an aluminum nozzle. The pair weighs about 31 g.
Three sizes of silicone ear tips (S, M and L) are included to get the right seal for each ear.
Connection
Detachable cable and microphone version
The cable measures about 125 cm.
It attaches to each earpiece with a standard gold-plated 0.75 mm 2-pin connector, so it can be replaced if damaged or swapped for another cable. The same connector lets you go wireless with a KZ Bluetooth adapter that is compatible.
Wireless mode with a Bluetooth adapter is for listening to music; to monitor yourself while you play, use the cable, which has no latency.
The microphone version adds an in-line remote to play or pause, skip tracks and take calls.
KZ ZSX technical specifications
| Drivers | 1 × 10 mm dual-magnet dynamic + 5 balanced armatures per side |
|---|---|
| Impedance | 24 Ω |
| Sensitivity | 111 dB |
| Frequency response | 7 Hz – 40 kHz |
| Earphone connector | 0.75 mm 2-pin, gold-plated |
| Plug | 3.5 mm jack |
| Cable | Detachable |
| Cable length | 125 cm |
| Shell | Resin with zinc alloy faceplate |
| Weight | 31 g |
| Microphone | Optional |
| Colors | Cyan and black |
What's in the box
- 1 pair of KZ ZSX earphones
- 1 detachable 2-pin cable
- 3 pairs of silicone ear tips (S, M and L)
- 1 user manual
KZ ZSX frequently asked questions
Can they be used as in-ear monitors for playing live or in the rehearsal room?
Yes. Worn with the cable over the ear and with the right ear tip size, they reduce the noise of the rehearsal room. The usual setup is to plug them into an IEM bodypack that receives a send from the mixing desk, so each musician gets their own mix; you can also plug them into the headphone output of the desk.
And for listening to music or gaming?
Yes. Although we recommend them mainly for playing, they work just as well for listening to music on your phone or computer and for gaming. Wired, there is no latency.
Do the KZ ZSX have noise cancellation?
They have no active noise cancellation. They are in-ear earphones with silicone ear tips, which passively block outside noise by sealing the ear canal.
Do they work with phones that have no headphone jack?
Yes, with a USB-C or Lightning to 3.5 mm jack adapter, or with a 0.75 mm 2-pin Bluetooth adapter.
Can the cable be replaced?
Yes. The cable is detachable and uses a standard 0.75 mm 2-pin connector.
What warranty do they come with?
3-year warranty against manufacturing defects, handled from Spain.
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