Short answer: a tie on sound quality. Both are rated 3.2/5 (#942 and #954 of 1291 in-ear headphones) at nearly the same price ($199 vs $199), so choose on features and fit.
The case for the Muse HiFi Power: A 14.5mm planar magnetic driver with about 2.3 dB of extra bass and sub-bass that stays within 6 dB of target down to 20 Hz, for a full, warm low end. The tradeoff: Squig.link measurements show a 12.7 dB peak near 11.9 kHz on top of a 6.5 dB dip near 6.5 kHz, so the lower treble sounds dim while the very top can add a hissy sheen.
The case for the NF Acous NM25: 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 catch: 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.
Buy the Muse HiFi Power or the NF Acous NM25 on features: they are rated the same for sound quality at close to the same price.
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A 14.5mm planar magnetic driver with about 2.3 dB of extra bass and sub-bass that stays within 6 dB of target down to 20 Hz, for a full, warm low end.
Audio46 $199.00 eBay
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.
Amazon $199.00 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
| Muse HiFi Power | NF Acous NM25 | |
|---|---|---|
| Price | $199.00 | $199.00 |
| Ranked | #942 of 1291 in In-Ear Headphones | #954 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 64 (measured by crinacle, via AutoEQ) | 64 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.99 dB standard deviation | 2.42 dB standard deviation |
| Tonal Tilt | -0.51 (negative is warmer, positive brighter) | +0.93 (negative is warmer, positive brighter) |
| Connection | Wired | Wired |
| Driver Type | Planar magnetic | Dynamic |
| Drivers | 1 x 14.5mm planar magnetic | 1 x dynamic |
| Impedance | 32 ohms | 32 ohms |
| Sensitivity | 106 dB/mW | 108 dB/mW |
| Frequency Response | 10Hz - 40kHz (Manufacturer specified) | - |
| Built-in Microphone | No | - |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.6 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-1.5 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 Muse HiFi Power from aftersound, dchpgall, hbb, musicafe and vsg; the NF Acous NM25 from cqtek, digaoreviews, faxepremium, musicafe, practiphile, pw, tonedeafmonk and treblewellxtended, all via squig.link.
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