Short answer: the NF Acous NM20. It ranks #649 of 1291 in-ear headphones by sound quality, rated 3.7/5, at $119; the NF Acous NA20 ranks #711, rated 3.6/5, at $119. The price gap is small enough that the sound-quality ranking should decide it.
What the NF Acous NM20 does well: The median of 10 hobbyist measurements gives it a solid Harman preference score of 70 with a 2.19 dB spread, and its mids sit within about 0.8 dB of target, so vocals and instruments sound natural. The catch: An 11.6 dB peak near 11.5 kHz can make cymbals and sibilance sound sharp.
The case for 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 catch: A 9.2 dB peak near 11.5 kHz can make cymbals and sibilance sound sharp.
Buy the NF Acous NM20. It is rated higher for sound quality than the NF Acous NA20 at the same price, so only choose the other one for a particular feature it does better.
Still deciding? The full Headphones rankings cover every ranked option.
The median of 10 hobbyist measurements gives it a solid Harman preference score of 70 with a 2.19 dB spread, and its mids sit within about 0.8 dB of target, so vocals and instruments sound natural.
Amazon $119.00 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
| NF Acous NM20 | NF Acous NA20 | |
|---|---|---|
| Price | $119.00 | $119.00 |
| Ranked | #649 of 1291 in In-Ear Headphones | #711 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x beryllium-plated dynamic | 1 x dynamic |
| Impedance | 32 ohms | 32 ohms |
| Frequency Response | 20Hz - 40kHz | 9Hz - 40kHz |
| Harman Preference Score | 70 (median of 10 squig.link measurements, calibrated to AutoEQ) | 69 (median of 11 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.19 dB standard deviation | 2.31 dB standard deviation |
| Tonal Tilt | +0.22 (negative is warmer, positive brighter) | -0.25 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+2.1 dB at 30 Hz) |
| Sensitivity | - | 109 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 NF Acous NM20 from arn, cqtek, hu-fi, joycesreview, koi, musicafe, obodio, pw, soundcheck39, suporsalad, tonedeafmonk and treblewellxtended; 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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