Short answer: the EPZ G20. It ranks #9 of 450 in-ear headphones by sound quality, rated 4.9/5, at $49.99; the ThieAudio Legacy 4 ranks #19, rated 4.8/5, and costs $50.99, so there is little reason to consider the other one.
Why pick the EPZ G20: The G20 is one of the most accurate inexpensive in-ears measured, with a preference score of 86 and under 1 dB of unevenness in the median of twelve hobbyist measurements on squig.link. The tradeoff: A 6.3 dB peak near 11.9 kHz adds extra air that can make some recordings sound a little hissy or splashy.
What the ThieAudio Legacy 4 does well: The Legacy 4 pairs one dynamic driver with three balanced armatures, and the median of twelve hobbyist measurements on squig.link shows bass essentially on target, slightly above it at 30 Hz. The tradeoff: A 4.3 dB dip near 3.75 kHz and a presence band about 2.3 dB low can push vocals back and soften the attack of guitars and snares.
Buy the EPZ G20. It is rated higher for sound quality than the ThieAudio Legacy 4 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Still deciding? The full Headphones rankings cover every ranked option.
Specifications Side By Side
| EPZ G20 | ThieAudio Legacy 4 | |
|---|---|---|
| Price | $49.99 | $50.99 |
| Ranked | #9 of 450 in In-Ear Headphones | #19 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 86 (median of 12 squig.link measurements, calibrated to AutoEQ) | 84 (median of 12 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 0.99 dB standard deviation | 1.19 dB standard deviation |
| Tonal Tilt | +0.10 (negative is warmer, positive brighter) | -0.10 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.7 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+0.4 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid (1 dynamic + 3 balanced armature) |
| Drivers | 1 x 10mm dynamic | 1 x 8mm dynamic + 3 x balanced armature |
| Sensitivity | 100 dB | 108 dB |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 20Hz - 20kHz (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| Impedance | - | 9.4 ohms |
Related Headphone Comparisons
More worthwhile head-to-heads for EPZ G20:
- EPZ G20 vs Truthear x Crinacle Zero RED
- EPZ G10 vs EPZ G20
- EPZ G20 vs EPZ Q1 Pro
- EPZ G20 vs Truthear Zero Blue 2
- EPZ G20 vs EPZ G30
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
EPZ G20: $49.99 Amazon eBay
Pros: The G20 is one of the most accurate inexpensive in-ears measured, with a preference score of 86 and under 1 dB of unevenness in the median of twelve hobbyist measurements on squig.link. Bass, midrange and lower treble all land within about 1 dB of target, and sub-bass stays full down to 20 Hz. It matches the rating of the costlier Truthear Zero Blue 2 and includes an inline microphone.
Cons: A 6.3 dB peak near 11.9 kHz adds extra air that can make some recordings sound a little hissy or splashy. The EPZ Q1 Pro earns the same rating for a bit less money, and the 100 dB sensitivity figure is unremarkable, though still fine for a phone.
Full EPZ G20 review and specifications →
| Back | Closed |
|---|---|
| Built-in Microphone | Yes |
| Connection | Wired |
| Deviation From Target | 0.99 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 86 (median of 12 squig.link measurements, calibrated to AutoEQ) |
| Sensitivity | 100 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.7 dB at 30 Hz) |
| Tonal Tilt | +0.10 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
ThieAudio Legacy 4: $50.99 Amazon eBay
Pros: The Legacy 4 pairs one dynamic driver with three balanced armatures, and the median of twelve hobbyist measurements on squig.link shows bass essentially on target, slightly above it at 30 Hz. With about 1.2 dB of unevenness and a preference score of 84, its bass, mids and treble sit within half a dB of target on average. It rates higher than the less expensive CCA Phoenix, and 108 dB sensitivity makes it easy to drive.
Cons: A 4.3 dB dip near 3.75 kHz and a presence band about 2.3 dB low can push vocals back and soften the attack of guitars and snares. There is no microphone, and the EPZ G20 and EPZ Q1 Pro both rate higher while costing a little less.
Full ThieAudio Legacy 4 review and specifications →
| Back | Closed |
|---|---|
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 1.19 dB standard deviation |
| Driver Type | Hybrid (1 dynamic + 3 balanced armature) |
| Drivers | 1 x 8mm dynamic + 3 x balanced armature |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 84 (median of 12 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 9.4 ohms |
| Sensitivity | 108 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.4 dB at 30 Hz) |
| Tonal Tilt | -0.10 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons