Short answer: the Tanchjim Bunny. It ranks #312 of 1291 in-ear headphones by sound quality, rated 4.1/5, at $23.99; the KZ ZSN Pro X ranks #388, rated 4.0/5, at $23.99. Close enough in price that the sound-quality gap is the deciding factor.
What the Tanchjim Bunny does well: A very affordable single dynamic in-ear with a built in microphone that reaches a preference score of 75 in squig.link hobbyist measurements. Watch for: Sub-bass falls about 2.5 dB below target and is down 3.2 dB at 30 Hz, so the deepest synth notes have less rumble than the mid bass suggests.
The case for the KZ ZSN Pro X: The hybrid design with a 10mm dynamic driver and a balanced armature gives bass about 3.6 dB above target at 60 to 200 Hz, which adds punch and warmth for pop and hip hop. The tradeoff: A 7.2 dB peak near 8.1 kHz and an air band about 5.8 dB above target can make cymbals and s sounds sharp or hissy at higher volume.
Buy the Tanchjim Bunny. It is rated higher for sound quality than the KZ ZSN Pro X at the same price, which makes it the one to get unless you need something the other one does better.
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A very affordable single dynamic in-ear with a built in microphone that reaches a preference score of 75 in squig.link hobbyist measurements.
Amazon $23.99 eBay
The hybrid design with a 10mm dynamic driver and a balanced armature gives bass about 3.6 dB above target at 60 to 200 Hz, which adds punch and warmth for pop and hip hop.
Amazon $23.99 eBayPrices on this page were last checked October 16, 2026 at 5:46 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| Tanchjim Bunny | KZ ZSN Pro X | |
|---|---|---|
| Price | $23.99 | $23.99 |
| Ranked | #312 of 1291 in In-Ear Headphones | #388 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 75 (median of 18 squig.link measurements, calibrated to AutoEQ) | 74 (measured by oratory1990, via AutoEQ) |
| Deviation From Target | 1.98 dB standard deviation | 2.09 dB standard deviation |
| Tonal Tilt | -0.05 (negative is warmer, positive brighter) | -0.17 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.2 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.1 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid (1 dynamic + 1 balanced armature) |
| Drivers | 1 x dynamic | 1 x 10mm dynamic + 1 x balanced armature |
| Impedance | 30 ohms | 25 ohms |
| Sensitivity | 123 dB/Vrms | 112 dB/mW |
| Frequency Response | 8Hz - 48kHz (Manufacturer specified) | 7Hz - 40kHz (Manufacturer specified) |
| Built-in Microphone | Yes | - |
Frequency Response Compared
Both headphones’ measurements overlaid on the Harman target. Above the target sounds louder in that range, below it quieter. Each curve is the median of several independent measurements, shifted so its 500 Hz to 2 kHz average sits at 0 dB, so only the tuning is compared.
Measurement data: the Tanchjim Bunny from aftersound, atechreviews, audioamigo, banzai1122, boizoff, csi-zone, digaoreviews, eplv, fernandagunsan, jaytiss, lumerion, samreviews, soundignity, superreview, therollo9, tonedeafmonk, treblewellxtended and vortexreviews; the KZ ZSN Pro X from achoreviews, aftersound, audioamigo, bryaudioreviews, dchpgall, eplv, gadgetrytech, melatonin, nymz, pw, ragnarok, riz, tdl and therollo9, all via squig.link.
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