Short answer: the Sony WF-1000XM6. It ranks #104 of 1291 in-ear headphones by sound quality, rated 4.5/5, at $328; the Melody Wings Neptune ranks #140, rated 4.4/5, at $328. With prices this close, go by the sound-quality ranking rather than the cost.
Why pick the Sony WF-1000XM6: These true wireless earbuds score 79.6 for preference in the median of 4 squig.link measurements, with a 1.37 dB deviation that tracks the target closely. The catch: Presence from 3 to 6 kHz runs about 2.3 dB low and a 3.6 dB dip near 10.9 kHz trims air, so vocals and cymbals sound slightly reserved.
The case for the Melody Wings Neptune: Across 6 squig.link measurements it scores 78.9 with a 1.48 dB spread, and its bass and mids stay within about 1 dB of target, so voices and instruments keep a natural balance. Watch for: The 5.6 dB peak near 8.2 kHz can make sibilance and bright recordings sound edgy at higher volumes.
Buy the Sony WF-1000XM6. It is rated higher for sound quality than the Melody Wings Neptune at the same price, so only choose the other one for a particular feature it does better.
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These true wireless earbuds score 79.6 for preference in the median of 4 squig.link measurements, with a 1.37 dB deviation that tracks the target closely.
Amazon $328.00 Lowest Sony $329.99 eBay
Across 6 squig.link measurements it scores 78.9 with a 1.48 dB spread, and its bass and mids stay within about 1 dB of target, so voices and instruments keep a natural balance.
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Specifications Side By Side
| Sony WF-1000XM6 | Melody Wings Neptune | |
|---|---|---|
| Price | $328.00 | $328.00 |
| Ranked | #104 of 1291 in In-Ear Headphones | #140 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 80 (median of 4 squig.link measurements, calibrated to AutoEQ) | 79 (median of 6 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.37 dB standard deviation | 1.48 dB standard deviation |
| Tonal Tilt | -0.06 (negative is warmer, positive brighter) | +0.07 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.6 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-1.2 dB at 30 Hz) |
| Connection | True wireless | Wired |
| Driver Type | Dynamic | Hybrid (1 dynamic + 4 balanced armature + 1 bone conduction) |
| Drivers | 1 x 8.4mm dynamic | 1 x 10mm dynamic + 4 x balanced armature + 1 x bone conduction |
| Weight | 0 lbs (6.5 g) per earbud | - |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 20Hz - 20kHz (Manufacturer specified) |
| Active Noise Cancelling | Yes | - |
| Battery Life | 8 hours (24 with case, Manufacturer specified) | - |
| Bluetooth Version | 5.3 | - |
| Bluetooth Codecs | SBC, AAC, LDAC, LC3 | - |
| Built-in Microphone | Yes | No |
| IP Rating | IPX4 | - |
| Impedance | - | 19 ohms |
| Sensitivity | - | 108 dB/mW |
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 Sony WF-1000XM6 from boizoff, dhrme, fernandagunsan and hbb; the Melody Wings Neptune from aftersound, fernandagunsan, jaytiss, superreview, takeitslow7 and tonedeafmonk, all via squig.link.
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