Short answer: the NF Audio NA2 Plus. It ranks #869 of 1291 in-ear headphones by sound quality, rated 3.4/5, at $169; the KZ Sonata ranks #933, rated 3.3/5, and costs $179.99, which makes this an easy call rather than a real tradeoff.
What the NF Audio NA2 Plus does well: Lower mids sit within about 0.5 dB of target, keeping voices and guitars natural. The tradeoff: An 8 dB peak near 11.5 kHz can make cymbals and sibilance sound sharp.
What the KZ Sonata does well: A broadly balanced tuning with a preference score of 65 against the Harman target. Watch for: An uneven response, 2.9 dB standard deviation from target.
Buy the NF Audio NA2 Plus. It is rated higher for sound quality than the KZ Sonata and costs less, so only choose the other one for a particular feature it does better.
Want more options? Browse the full Headphones rankings.
Lower mids sit within about 0.5 dB of target, keeping voices and guitars natural.
Shenzhen Audio $169.00 eBay
A broadly balanced tuning with a preference score of 65 against the Harman target.
Linsoul $179.99 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 Audio NA2 Plus | KZ Sonata | |
|---|---|---|
| Price | $169.00 | $179.99 |
| Ranked | #869 of 1291 in In-Ear Headphones | #933 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Balanced Armature |
| Drivers | 1 x 10mm dynamic | 14 Balanced Armature drivers per side (28 BA total) |
| Impedance | 32 ohms | 24 - 28 ohms (standard 22 ohms) |
| Sensitivity | 107 dB/mW | 111 dB |
| Frequency Response | 9Hz - 40kHz (Manufacturer specified) | 20Hz - 40kHz |
| Harman Preference Score | 66 (median of 15 squig.link measurements, calibrated to AutoEQ) | 65 (median of 5 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.58 dB standard deviation | 2.86 dB standard deviation |
| Tonal Tilt | +0.75 (negative is warmer, positive brighter) | +0.47 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-5.0 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-5.7 dB at 30 Hz) |
| Weight | - | Not specified |
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 Audio NA2 Plus from aftersound, ankramutt, arn, bukanaudiophile, cammyfi, cqtek, dentreviews, hbb, jaytiss, kazi, koi, melatonin, musicafe, obodio, practiphile, precog, soundignity, superreview, suporsalad, theaudiostore and treblewellxtended; the KZ Sonata from audioamigo, hbb, jaytiss, koi and pw, all via squig.link.
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