Short answer: a tie on sound quality. Both are rated 4.4/5 (#125 and #100 of 450 in-ear headphones) at nearly the same price ($55.99 vs $53.99), so choose on features and fit.
The case for the TRN Medusa: Thirteen hobbyist measurements on squig.link put the Medusa at a preference score of 78.7, with a single 12mm dynamic driver that holds bass almost exactly on target down to 30 Hz. The tradeoff: The air band runs about 6.5 dB above target and peaks 8.6 dB near 11.9 kHz, so it can sound hissy and fatiguing with bright mixes or at high volume.
Buy the KZ ZEX Pro or the TRN Medusa on features: they are rated the same for sound quality at close to the same price.
Still deciding? The full Headphones rankings cover every ranked option.
Specifications Side By Side
| KZ ZEX Pro | TRN Medusa | |
|---|---|---|
| Price | $55.99 | $53.99 |
| Ranked | #125 of 450 in In-Ear Headphones | #100 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 78 (median of 19 squig.link measurements, calibrated to AutoEQ) | 79 (median of 13 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.58 dB standard deviation | 1.55 dB standard deviation |
| Tonal Tilt | -0.26 (negative is warmer, positive brighter) | +0.10 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.5 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.2 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 1 balanced armature + 1 electrostatic) | Dynamic |
| Drivers | 1 x 10mm dynamic + 1 x balanced armature + 1 x electrostatic | 1 x 12mm dynamic |
| Impedance | 25 ohms | 30 ohms |
| Sensitivity | 104 dB | 108 dB |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 20Hz - 20kHz (Manufacturer specified) |
| Weight | - | 0 lbs (5.1 g) per earbud |
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Prices on this page were last checked October 11, 2026 at 4:59 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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The Two Headphones In Full
KZ ZEX Pro: $55.99 Amazon eBay
Full KZ ZEX Pro review and specifications →
| Released | 2021 (5 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 1.58 dB standard deviation |
| Driver Type | Hybrid (1 dynamic + 1 balanced armature + 1 electrostatic) |
| Drivers | 1 x 10mm dynamic + 1 x balanced armature + 1 x electrostatic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 78 (median of 19 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 25 ohms |
| Sensitivity | 104 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.5 dB at 30 Hz) |
| Tonal Tilt | -0.26 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
TRN Medusa: $53.99 Amazon eBay
Pros: Thirteen hobbyist measurements on squig.link put the Medusa at a preference score of 78.7, with a single 12mm dynamic driver that holds bass almost exactly on target down to 30 Hz. Midbass sits 1.7 dB above target for punchy drums, while vocals in the 1 to 3 kHz range come through clearly. It weighs 5.1 g per earbud and its 30 ohm, 108 dB load is easy for any phone.
Cons: The air band runs about 6.5 dB above target and peaks 8.6 dB near 11.9 kHz, so it can sound hissy and fatiguing with bright mixes or at high volume. It costs a little more than the equally rated KBEAR KB02 and CCA Pianist.
Full TRN Medusa review and specifications →
| Released | 2024 (2 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 1.55 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 12mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 79 (median of 13 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 30 ohms |
| Sensitivity | 108 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.2 dB at 30 Hz) |
| Tonal Tilt | +0.10 (negative is warmer, positive brighter) |
| Weight | 0 lbs (5.1 g) per earbud |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons