The NF Acous NM25 ranks #627 out of 946 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: NF Acous
Prices on this page were last checked October 13, 2026 at 3:17 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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#627 NF Acous NM25: $199.00 Amazon $199.00 eBay
Pros: A single dynamic driver earphone with a bright, detailed character that suits V-shaped and neutral listeners, with a low end that stays within 6 dB of target down to 20 Hz. The response never dips below target anywhere between 1.5 and 12 kHz, so vocals sound present and forward. At 32 ohms and 108 dB/mW it runs comfortably from a phone or dongle.
Cons: Treble runs about 6 dB above target from 6 to 16 kHz, peaking 12.3 dB near 11.2 kHz in the median of 7 hobbyist measurements on squig.link, so cymbals, hi-hats and sibilance can sound hot and fatiguing at higher volume. Sub-bass sits slightly under target, which leaves bass-heavy genres feeling lean, and the preference score of 64 reflects that brightness.
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.42 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x dynamic |
| Form Factor | In-ear |
| Harman Preference Score | 64 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 108 dB/mW |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.5 dB at 30 Hz) |
| Tonal Tilt | +0.93 (negative is warmer, positive brighter) |
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