Short answer: the 7Hz Salnotes Zero. It ranks #26 of 1368 in-ear headphones by sound quality, rated 4.8/5, at $22.99. The KZ EDX Pro ranks #1134, rated 2.7/5, at $17.99, $5 cheaper, which does not close the gap in sound quality.
The 7Hz Salnotes Zero is the better-sounding choice. A Harman score of 84 from a single 10 mm dynamic driver at a bargain price is remarkable. The catch: Presence and treble run about 2.1 to 2.2 dB under target, and a 6.2 dB dip near 10 kHz leaves cymbals and breath detail muted.
The case for the KZ EDX Pro: It costs very little and is easy to drive, with 24 ohm impedance and a 112 dB sensitivity rating that suit a phone. Watch for: Crinacle’s measurement gives it a preference score of 58, well short of what most listeners prefer.
Buy the 7Hz Salnotes Zero. It is rated higher for sound quality, and saving $5 with the KZ EDX Pro does not make up for the sound-quality gap.
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A Harman score of 84 from a single 10 mm dynamic driver at a bargain price is remarkable.
Amazon $22.99 eBay
It costs very little and is easy to drive, with 24 ohm impedance and a 112 dB sensitivity rating that suit a phone.
Amazon $17.99 eBayPrices on this page were last checked October 19, 2026 at 10:32 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
| 7Hz Salnotes Zero | KZ EDX Pro | |
|---|---|---|
| Price | $22.99 | $17.99 |
| Ranked | #26 of 1368 in In-Ear Headphones | #1134 of 1368 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 84 (measured by oratory1990, via AutoEQ) | 58 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 1.31 dB standard deviation | 2.91 dB standard deviation |
| Tonal Tilt | -0.16 (negative is warmer, positive brighter) | -1.10 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+2.7 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic |
| Impedance | 32 ohms | 24 ohms |
| Sensitivity | 108 dB SPL/V | 112 dB |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) | 10Hz - 20kHz (Manufacturer specified) |
| Back | Closed | Closed |
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 7Hz Salnotes Zero from achoreviews, aftersound, ankramutt, arn, audioamigo, bassaudio, bedrock, cammyfi, dentreviews, dvewlsh, eplv, flare, gadgetrytech, harpo, harutohiroki, hbb, hobbytalk, ianfann, iemocean, iemworld, jaytiss, lown-fi, lumerion, mmagtech, musicafe, nymz, precog, pw, sl0the, soundcheck39, superreview, tedthepraimortis, theaudiostore, therollo9, timmyv, treblewellxtended, vortexreviews and yoshiultra; the KZ EDX Pro from achoreviews, aden, aftersound, ankramutt, bassyalexander, eplv, hbb, jacstone, lown-fi, melatonin, obodio, precog, pw, rg, superreview and vortexreviews, all via squig.link.
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