KZ Castor: dual-dynamic in-ear monitors to start playing with IEMs
The KZ Castor are wired in-ear monitors with two dynamic drivers per side and four tuning switches. They come in two versions: one tuned to the Harman curve and one with boosted bass, both with or without a microphone.
They are designed for musicians who want to hear themselves clearly in rehearsal and on stage. They are an affordable way to start using in-ear monitors in the rehearsal room, and their switches let you adjust the tuning to what you play.
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.
- 2dynamic drivers per earpiece, 8 and 10 mm
- 2versions: Harman and bass-enhanced
- 4tuning switches per earpiece
- 2-pinflat silver-plated cable, 120 cm
Sound
Sound: two stacked dynamic drivers
Each earpiece houses two stacked dynamic drivers: an 8 mm unit for the bass (20 to 200 Hz) and a 10 mm dual-magnet unit for the mids and treble.
Impedance varies with the version: 31 to 35 Ω on the Harman and 16 to 20 Ω on the bass-boosted one. Either way, they run straight from a phone, laptop or music player.
Versions
Two versions and four tuning switches
The Harman version follows the Harman reference curve; the “Improved Bass” version boosts the bass.
Each earpiece also has four switches: two levels for the bass and two for the mids and treble, giving up to 16 sound profiles. They are set with the tuning pin included in the box.
Design
Design and fit
The shell is precision injection-molded and houses the two stacked drivers.
Three sizes of silicone ear tips (S, M and L) are included to get the right seal for each ear.
Connection
Detachable flat cable and microphone version
The cable is flat and silver-plated, and measures 120 cm (±5 cm).
It attaches to each earpiece with a standard 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.
Also available with an in-line microphone.
KZ Castor technical specifications
| Drivers | 2 dynamic per side: 8 mm and 10 mm dual-magnet |
|---|---|
| Impedance | 31–35 Ω (Harman) / 16–20 Ω (bass-boosted) |
| Sensitivity | 105 ± 3 dB (Harman) / 103 ± 3 dB (bass-boosted) |
| Frequency response | 20 Hz – 40 kHz |
| Earphone connector | 0.75 mm 2-pin |
| Plug | 3.5 mm jack |
| Cable | Flat, silver-plated, detachable |
| Cable length | 120 ± 5 cm |
| Switches | 4 per earpiece |
| Microphone | Optional |
| Versions | Harman and bass-boosted |
What's in the box
- 1 pair of KZ Castor earphones
- 1 detachable silver-plated 2-pin cable
- 3 pairs of silicone ear tips (S, M and L)
- 1 tuning pin
- 1 user manual
KZ Castor 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 Castor 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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