Short answer: a tie on sound quality. Both are rated 4.1/5 (#339 and #320 of 1291 in-ear headphones) at nearly the same price ($99.99 vs $99), so choose on features and fit.
Why pick the Moondrop Aria 2: In squig.link measurements it reaches a preference score of 75 with a smooth response, deviating only about 2 dB on average from the Harman target. The catch: A 4.8 dB dip near 6 kHz and presence about 2.8 dB below target take some bite and detail off snares and consonants.
What the ThieAudio Legacy 2 does well: A hybrid in-ear pairing a 10mm dynamic driver with a balanced armature, with a clean, correctly weighted sound and a 75 preference score. Watch for: 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.
Buy the Moondrop Aria 2 or the ThieAudio Legacy 2 on features: they are rated the same for sound quality at close to the same price.
Still deciding? The full Headphones rankings cover every ranked option.
In squig.link measurements it reaches a preference score of 75 with a smooth response, deviating only about 2 dB on average from the Harman target.
Amazon $99.99 eBay
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 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
| Moondrop Aria 2 | ThieAudio Legacy 2 | |
|---|---|---|
| Price | $99.99 | $99.00 |
| Ranked | #339 of 1291 in In-Ear Headphones | #320 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 75 (median of 22 squig.link measurements, calibrated to AutoEQ) | 75 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 1.97 dB standard deviation | 2.10 dB standard deviation |
| Tonal Tilt | -0.13 (negative is warmer, positive brighter) | +0.11 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.7 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.5 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid (1 dynamic + 1 balanced armature) |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic + 1 x balanced armature |
| Impedance | 33 ohms | 32 ohms |
| Sensitivity | 122 dB/Vrms | 108 dB |
| Frequency Response | 16Hz - 22kHz (Manufacturer specified) | 20Hz - 20kHz (Manufacturer specified) |
| Built-in Microphone | No | - |
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 Moondrop Aria 2 from aftersound, arn, atechreviews, audioamigo, awsmdanny, csi-zone, gadgetrytech, harpo, hu-fi, ianfann, jaytiss, lown-fi, mmagtech, pw, sl0the, soundignity, superreview, theaudiostore, therollo9, timmyv, treblewellxtended and vortexreviews; the ThieAudio Legacy 2 from achoreviews, audioamigo, bedrock, csi-zone, dchpgall, dentreviews, ducbloke, gadgetrytech, hbb, precog, pw, soundignity, superreview and vsg, all via squig.link.
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