Short answer: the ThieAudio Legacy 4. It ranks #19 of 450 in-ear headphones by sound quality, rated 4.8/5, at $50.99; the Ooopusx OP24 ranks #68, rated 4.5/5, at $49.99. Close enough in price that the sound-quality gap is the deciding factor.
Why pick the ThieAudio Legacy 4: 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.
The case for the Ooopusx OP24: Its six-driver hybrid scores 80.0 across 11 hobbyist measurements on squig.link, and sub-bass and bass both sit nearly 2 dB above target, giving electronic and hip hop tracks a full, rumbling low end. The catch: A 5.8 dB peak near 8.1 kHz can make cymbals and esses sound splashy on bright recordings.
Buy the ThieAudio Legacy 4. It is rated higher for sound quality, and the $1 you would save on the Ooopusx OP24 does not close the gap.
Looking for alternatives? See the complete Headphones rankings.
Specifications Side By Side
| ThieAudio Legacy 4 | Ooopusx OP24 | |
|---|---|---|
| Price | $50.99 | $49.99 |
| Ranked | #19 of 450 in In-Ear Headphones | #68 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 84 (median of 12 squig.link measurements, calibrated to AutoEQ) | 80 (median of 12 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.19 dB standard deviation | 1.42 dB standard deviation |
| Tonal Tilt | -0.10 (negative is warmer, positive brighter) | -0.32 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+1.3 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 3 balanced armature) | Hybrid (2 dynamic + 4 balanced armature) |
| Drivers | 1 x 8mm dynamic + 3 x balanced armature | 2 x dynamic + 4 x balanced armature |
| Impedance | 9.4 ohms | 15 ohms (27 ohms in mode 2) |
| Sensitivity | 108 dB | 127 dB/Vrms |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 10Hz - 40kHz (Manufacturer specified) |
| Built-in Microphone | No | - |
Related Headphone Comparisons
How ThieAudio Legacy 4 compares with other leading options:
- EPZ G20 vs ThieAudio Legacy 4
- ThieAudio Legacy 4 vs CCA Rhapsody
- ThieAudio Legacy 2 vs ThieAudio Legacy 4
- CCA Rhapsody vs Ooopusx OP24
- Ooopusx OP24 vs TANGZU Wan’er SG Studio Edition
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
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
Ooopusx OP24: $49.99 Amazon eBay
Pros: Its six-driver hybrid scores 80.0 across 11 hobbyist measurements on squig.link, and sub-bass and bass both sit nearly 2 dB above target, giving electronic and hip hop tracks a full, rumbling low end. Treble from 6 to 10 kHz is lifted about 1.9 dB for crisp detail, a lively v-shaped balance. A second impedance mode (15 or 27 ohms) gives a tuning option, and 127 dB/Vrms sensitivity makes it easy to drive.
Cons: A 5.8 dB peak near 8.1 kHz can make cymbals and esses sound splashy on bright recordings. The 4.7 dB dip that follows near 10.2 kHz makes the top end uneven rather than smoothly extended.
Full Ooopusx OP24 review and specifications →
| Released | Aug 2025 (1 year ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 1.42 dB standard deviation |
| Driver Type | Hybrid (2 dynamic + 4 balanced armature) |
| Drivers | 2 x dynamic + 4 x balanced armature |
| Form Factor | In-ear |
| Frequency Response | 10Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 80 (median of 12 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 15 ohms (27 ohms in mode 2) |
| Sensitivity | 127 dB/Vrms |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.3 dB at 30 Hz) |
| Tonal Tilt | -0.32 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons