Short answer: the ThieAudio Legacy 2. It ranks #320 of 1291 in-ear headphones by sound quality, rated 4.1/5, at $99; the NF Audio NM2 ranks #411, rated 4.0/5, at $99. The price gap is small enough that the sound-quality ranking should decide it.
Why pick the ThieAudio Legacy 2: A hybrid in-ear pairing a 10mm dynamic driver with a balanced armature, with a clean, correctly weighted sound and a 75 preference score. The catch: Presence runs about 2.9 dB and air about 3.4 dB below target, with a 6.8 dB dip near 11.9 kHz, so cymbals lack some sparkle and the top end feels slightly reserved.
Why pick the NF Audio NM2: The median of 14 hobbyist measurements gives it a solid Harman preference score of 74 with a 2.18 dB spread, and its mids sit within about 0.8 dB of target, so vocals and instruments sound natural. Watch for: A 6.2 dB peak near 8.2 kHz can make cymbals and sibilance sound sharp.
Buy the ThieAudio Legacy 2. It is rated higher for sound quality than the NF Audio NM2 at the same price, which makes it the one to get unless you need something the other one does better.
Still deciding? The full Headphones rankings cover every ranked option.
A hybrid in-ear pairing a 10mm dynamic driver with a balanced armature, with a clean, correctly weighted sound and a 75 preference score.
AliExpress $99.00 eBay
The median of 14 hobbyist measurements gives it a solid Harman preference score of 74 with a 2.18 dB spread, and its mids sit within about 0.8 dB of target, so vocals and instruments sound natural.
Shenzhenaudio $99.00 eBayPrices on this page were last checked October 16, 2026 at 5:46 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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Specifications Side By Side
| ThieAudio Legacy 2 | NF Audio NM2 | |
|---|---|---|
| Price | $99.00 | $99.00 |
| Ranked | #320 of 1291 in In-Ear Headphones | #411 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 75 (measured by crinacle, via AutoEQ) | 74 (median of 14 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.10 dB standard deviation | 2.18 dB standard deviation |
| Tonal Tilt | +0.11 (negative is warmer, positive brighter) | -0.00 (negative is warmer, positive brighter) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 1 balanced armature) | Dynamic |
| Drivers | 1 x 10mm dynamic + 1 x balanced armature | 1 x dynamic (dual cavity) |
| Impedance | 32 ohms | 18 ohms |
| Sensitivity | 108 dB | 108 dB/mW |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 10Hz - 40kHz (Manufacturer specified) |
| 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 (-1.9 dB at 30 Hz) |
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 ThieAudio Legacy 2 from achoreviews, audioamigo, bedrock, csi-zone, dchpgall, dentreviews, ducbloke, gadgetrytech, hbb, precog, pw, soundignity, superreview and vsg; the NF Audio NM2 from achoreviews, aftersound, atechreviews, bukanaudiophile, cqtek, hu-fi, ianfann, kazi, melatonin, mmagtech, pw, superreview, tgx78 and vortexreviews, all via squig.link.
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