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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-02 · 7 min read · Independent comparison
• G.K KZ Zax — biggest strength: a hybrid 1DD + 7BA driver setup with a 10mm PEK spring diaphragm and a 10Hz–40kHz frequency range, giving it genuine hi-fi ambitions at an in-ear monitor level.
• G.K KZ Zax — biggest trade-off: it is wired only, 3.5mm jack, no microphone, 27g of cast zinc alloy, so it is tethered and purely a listening tool.
• QYGCKJ ERAZER XF23 — biggest strength: 4-in-1 functionality — real-time translation across 165 languages, music, calls and a shared two-person conversation mode over Bluetooth 5.4.
• QYGCKJ ERAZER XF23 — biggest trade-off: the audio hardware is a single 16mm dynamic speaker in an open-ear format, so it prioritizes awareness and communication over isolation and detail.
• Who each is for: the KZ Zax is for listeners who care about sound quality and isolation; the ERAZER XF23 is for travelers, language learners and anyone who talks across languages daily.
The KZ Zax is unapologetically a listening device. Its whole design story is about squeezing detail out of a wired connection: one dynamic driver paired with seven balanced armature drivers, with a custom 50024 BA combination handling the mid and high frequencies and above. In practice, that kind of configuration is what gives an IEM its sense of separation — you get the low-end punch from the 10mm PEK spring diaphragm dynamic unit and the fine upper detail from the armatures. The 10Hz–40kHz frequency range is wide on paper, and 113dB sensitivity at 24 ohm impedance tells me it is easy to drive from a phone or a modest dongle, not something that demands a dedicated amplifier.
The build is the other half of the pitch. The shell is cast zinc alloy with pearl chrome plating, which the spec sheet says is there to resist oxidation and keep the finish looking right over long-term use. At 27g for the pair, these are substantial in the hand, not featherweight plastic. The included cable is a 4-strand, 25-core high-purity oxygen-free copper silver-plated design with a 100-wire core, and it is detachable — a real plus if a cable ever fails, since you can replace it rather than the whole earphone.
QYGCKJ ERAZER XF23: Who It's For
The ERAZER XF23 is a different species of product. QYGCKJ built it around translation first, audio second. The headline capability is real-time translation across 165 languages, with multiple translation modes including a binaural/free-talk setup and a headphones-plus-phone mode. The genuinely clever part is the shared design: two people can wear the same pair and converse in different languages, which is the scenario most travel and meeting use actually looks like. The stated accuracy is up to 98%, and the spec sheet also mentions encryption and security protocols to protect the conversation data — a reasonable concern when your earbuds are effectively a live microphone in a business meeting.
On the audio side, the XF23 uses an open-ear format with a single 16mm dynamic speaker per side, tuned for 360° stereo with balanced mids and clear highs. Open-ear means it does not seal your canal — you stay aware of your surroundings, which is the right call for travel, walking and sport, and the wrong call if you want to block out a noisy train. Connectivity is Bluetooth 5.4, which is the current generation and brings faster, more stable links and low-latency behaviour. Weight is listed at 6.7 ounces for the package, and the retail box is 7.6 x 5.63 x 2.13 inches.
Who should buy it: frequent travelers, people working across language barriers, students learning a language, and anyone who takes calls and listens to music on the move without wanting to be sealed off from the world. Who should skip it: critical listeners who want isolation and wired fidelity, and anyone who does not actually need translation — you would be paying for a feature you will never open. It is also worth noting the spec sheet leans on AI translation as the core value, so buy it for that, not as a pure music earphone.
Side-by-Side: Which Should You Choose?
• Best for sound quality and detail → G.K KZ Zax. One dynamic plus seven balanced armature drivers is a far more serious audio configuration than a single 16mm dynamic speaker.
• Best for travel and language barriers → QYGCKJ ERAZER XF23. 165 languages, real-time, with a shared two-person mode, is a feature no wired IEM can match.
• Best for phone calls → QYGCKJ ERAZER XF23. Bluetooth 5.4 wireless with call support versus a wired, no-mic earphone.
• Best for a replaceable, long-life build → G.K KZ Zax. Cast zinc alloy shell with anti-oxidation plating and a detachable cable means you can keep it running for years.
• Best for staying aware of your surroundings → QYGCKJ ERAZER XF23. Open-ear is safer for cycling, running and busy streets.
• Best for use with older gear or a laptop jack → G.K KZ Zax. A plain 3.5mm connection works with almost anything, no pairing, no battery.
• Best for a gift with an obvious "wow" factor → QYGCKJ ERAZER XF23. Real-time translation is the kind of thing people show off.
In my opinion, these are not interchangeable, so my recommendation splits cleanly. If I were buying for myself to actually listen to music — and I wanted isolation, a metal shell that survives daily abuse, and a detachable cable I can replace — I would buy the G.K KZ Zax. The 1DD+7BA hybrid setup and 10Hz–40kHz range simply promise more as an earphone. I would only pick the QYGCKJ ERAZER XF23 if real-time translation across 165 languages were a genuine part of my life, because that is what you are really paying for, and the open-ear 16mm sound is a supporting act. Decide which problem you have, then buy accordingly. Check the current price on Amazon before you commit, since both sit in very different budget brackets.
How to clean in ear headphones
For the G.K KZ Zax, wipe the zinc alloy shell with a dry or barely damp cloth and gently clear the nozzle of earwax with a soft brush — the metal body is the easy part to keep clean. Because the cable is detachable, you can unplug it before cleaning so nothing gets pulled. Never run the earphones under water; passive noise isolation comes from the seal, and moisture in the nozzle is what kills IEMs.
How to fit in ear headphones
The KZ Zax is an in-ear monitor, so fit is everything: insert the tip and twist slightly until you feel a seal, then check that the 113dB sensitivity is working for you at low volume. Try the different included eartip sizes until outside noise drops away — that seal is what gives you the isolation. The ERAZER XF23 is open-ear and sits outside the canal, so you simply hook it over the ear for a secure but unsealed fit.
How to open in ear headphones
If you mean the retail box, the KZ Zax ships in FFP packaging with the cable, eartips and a user manual, so open the flap and take out the accessories first. If you mean the earphone itself, you do not open an IEM — you swap the detachable cable and change the eartips, which is the only user-serviceable part. The XF23 is a sealed wireless earbud, so there is nothing to open beyond the charging case and box.
How to ear headphones
If you mean how to wear them for the best result: the KZ Zax goes in the canal with a sealed twist for isolation and detail, cable running down or over the ear as you prefer. The ERAZER XF23 rests over the ear and outside the canal so you keep ambient awareness while translating or taking calls. Match the wearing style to the job — sealed for listening, open for talking.
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See also: iClever BTH20 vs Paekole AI Translation Earbuds, CCA KZ ZSN Pro vs JiaSifu True: In Ear Headset, Xmenha Mini Invisible Earbuds vs dbsono Active Noise Cancelling, Tronsmart Q20S vs Hamwesh Clip