Short answer: the Unique Melody MEXT. Both are rated 3.9/5 for sound quality (#300 and #316 of 450 in-ear headphones), and the Unique Melody MEXT costs $999 against $1,199 for the 64 Audio U4s, with sound quality a draw, the lower price decides it.
The case for the Unique Melody MEXT: Bass is full and well extended, sitting about 1 dB above target from 20 Hz to 200 Hz in squig.link measurements, which gives electronic music and film scores solid low end weight. The tradeoff: Across hobbyist measurements the presence region sits 4.5 dB low with a 7.6 dB dip near 3.5 kHz, so vocals and guitars can sound recessed and lack bite.
Buy the Unique Melody MEXT. Both are rated the same for sound quality, and it costs $200 less than the 64 Audio U4s.
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Specifications Side By Side
| 64 Audio U4s | Unique Melody MEXT | |
|---|---|---|
| Price | $1,199.00 | $999.00 |
| Ranked | #316 of 450 in In-Ear Headphones | #300 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 72 (median of 4 squig.link measurements, calibrated to AutoEQ) | 72 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 2.23 dB standard deviation | 2.23 dB standard deviation |
| Tonal Tilt | -0.30 (negative is warmer, positive brighter) | -0.48 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+0.3 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 3 balanced armature) | Hybrid (1 dynamic + 4 balanced armature + 1 bone conduction) |
| Drivers | 1 x dynamic + 3 x balanced armature | 1 x dynamic + 4 x balanced armature + 1 x bone conduction |
| Impedance | 11 ohms | 16 ohms |
| Sensitivity | 107 dB/mW | 108 dB @ 1kHz |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) | 20Hz - 23kHz (Manufacturer specified) |
| Built-in Microphone | - | No |
Related Headphone Comparisons
How Unique Melody MEXT compares with other leading options:
- Letshuoer Conductor vs Unique Melody MEXT
- Unique Melody MEXT vs SoftEars Twilight
- Kinera Verdandi vs 64 Audio U4s
- Aful Dawn X vs 64 Audio U4s
- 64 Audio U4s vs ThieAudio V16 Divinity
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
64 Audio U4s: $1,199.00 64 Audio eBay
Full 64 Audio U4s review and specifications →
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.23 dB standard deviation |
| Driver Type | Hybrid (1 dynamic + 3 balanced armature) |
| Drivers | 1 x dynamic + 3 x balanced armature |
| Form Factor | In-ear |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 72 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 11 ohms |
| Sensitivity | 107 dB/mW |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.4 dB at 30 Hz) |
| Tonal Tilt | -0.30 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Unique Melody MEXT: $999.00 HiFiGo eBay
Pros: Bass is full and well extended, sitting about 1 dB above target from 20 Hz to 200 Hz in squig.link measurements, which gives electronic music and film scores solid low end weight. The hybrid design pairs a dynamic woofer and four balanced armatures with a bone conduction driver, and the tuning fits warm and bass-loving listeners. With 16 ohms and 108 dB sensitivity it runs easily from a phone.
Cons: Across hobbyist measurements the presence region sits 4.5 dB low with a 7.6 dB dip near 3.5 kHz, so vocals and guitars can sound recessed and lack bite. Crinacle’s preference score of 72 is modest for its price, and it rates the same as the DUNU Zen, which costs less.
Full Unique Melody MEXT review and specifications →
| Released | 2022 (4 years ago) |
|---|---|
| Back | Closed |
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 2.23 dB standard deviation |
| Driver Type | Hybrid (1 dynamic + 4 balanced armature + 1 bone conduction) |
| Drivers | 1 x dynamic + 4 x balanced armature + 1 x bone conduction |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 23kHz (Manufacturer specified) |
| Harman Preference Score | 72 (measured by crinacle, via AutoEQ) |
| Impedance | 16 ohms |
| Sensitivity | 108 dB @ 1kHz |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.3 dB at 30 Hz) |
| Tonal Tilt | -0.48 (negative is warmer, positive brighter) |
EQ preset to match the Harman target
Set a preamp of -5.8 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -2.3 dB | 0.70 |
| Peak | 3,446 Hz | +6.7 dB | 1.41 |
| Peak | 5,898 Hz | -6.1 dB | 2.52 |
| Peak | 394 Hz | -1.1 dB | 0.18 |
| Peak | 66 Hz | +2.6 dB | 1.11 |
| High shelf | 10,000 Hz | -1.8 dB | 0.70 |
| Peak | 199 Hz | -0.5 dB | 1.11 |
| Peak | 1,420 Hz | -0.6 dB | 3.01 |
| Peak | 433 Hz | +1.8 dB | 6.00 |
| Peak | 100 Hz | +0.3 dB | 2.47 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons