Short answer: a tie on sound quality. Both are rated 3.6/5 (#722 and #711 of 1291 in-ear headphones) at nearly the same price ($119.99 vs $119), so choose on features and fit.
The case for the Hidizs MS3: Eight hobbyist measurements give it a preference score of 69 with a lively V-shaped tuning that suits fans of punchy bass and crisp detail. Watch for: A 10.1 dB peak near 8 kHz and air about 5 dB above target make cymbals, hi hats and sibilance hot, which can tire the ears at higher volume.
Why pick the NF Acous NA20: The median of 11 hobbyist measurements gives it a solid Harman preference score of 69 with a 2.31 dB spread, and its mids sit within about 0.8 dB of target, so vocals and instruments sound natural. The tradeoff: A 9.2 dB peak near 11.5 kHz can make cymbals and sibilance sound sharp.
Buy the Hidizs MS3 or the NF Acous NA20 on features: they are rated the same for sound quality at close to the same price.
Looking for alternatives? See the complete Headphones rankings.
Eight hobbyist measurements give it a preference score of 69 with a lively V-shaped tuning that suits fans of punchy bass and crisp detail.
Amazon $119.99 eBay
The median of 11 hobbyist measurements gives it a solid Harman preference score of 69 with a 2.31 dB spread, and its mids sit within about 0.8 dB of target, so vocals and instruments sound natural.
Amazon $119.00 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
| Hidizs MS3 | NF Acous NA20 | |
|---|---|---|
| Price | $119.99 | $119.00 |
| Ranked | #722 of 1291 in In-Ear Headphones | #711 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 69 (median of 8 squig.link measurements, calibrated to AutoEQ) | 69 (median of 11 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.48 dB standard deviation | 2.31 dB standard deviation |
| Tonal Tilt | +0.31 (negative is warmer, positive brighter) | -0.25 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.2 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+2.1 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 2 balanced armature) | Dynamic |
| Drivers | 1 x 10.2mm dynamic + 2 x balanced armature | 1 x dynamic |
| Impedance | 18 ohms | 32 ohms |
| Sensitivity | 112 dB | 109 dB/mW |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 9Hz - 40kHz |
| 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 Hidizs MS3 from dchpgall, fahryst, jaytiss, mmagtech, practiphile, regancipher, silicagel and soundignity; the NF Acous NA20 from arn, audioamigo, cqtek, ducbloke, joycesreview, koi, lumerion, obodio, practiphile, pw, theaudiostore, tonedeafmonk and treblewellxtended, all via squig.link.
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