Short answer: the TRN MT3. Both are rated 4.8/5 for sound quality (#38 and #26 of 1291 in-ear headphones), and the TRN MT3 costs $17.99 against $22.99 for the 7Hz Salnotes Zero, and with sound quality even, the cheaper one is the better buy.
What the 7Hz Salnotes Zero does well: 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.
What the TRN MT3 does well: The MT3 scores 83.4 for preference in the median of eight hobbyist measurements on squig.link, with a smooth 1.18 dB deviation from target. The tradeoff: Treble is lifted, about 2 dB high from 6 to 10 kHz and 3.6 dB high above 10 kHz, with a 5.1 dB peak near 8.4 kHz that can make sibilance and cymbals sound splashy.
Buy the TRN MT3. Both are rated the same for sound quality, and it costs $5 less than the 7Hz Salnotes Zero.
Looking for alternatives? See the complete Headphones rankings.
A Harman score of 84 from a single 10 mm dynamic driver at a bargain price is remarkable.
Amazon $22.99 eBay
The MT3 scores 83.4 for preference in the median of eight hobbyist measurements on squig.link, with a smooth 1.18 dB deviation from target.
Amazon $17.99 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
| 7Hz Salnotes Zero | TRN MT3 | |
|---|---|---|
| Price | $22.99 | $17.99 |
| Ranked | #26 of 1291 in In-Ear Headphones | #38 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 84 (measured by oratory1990, via AutoEQ) | 83 (median of 8 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.31 dB standard deviation | 1.18 dB standard deviation |
| Tonal Tilt | -0.16 (negative is warmer, positive brighter) | -0.09 (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 (+0.2 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic |
| Impedance | 32 ohms | 28 ohms |
| Sensitivity | 108 dB SPL/V | 114 dB |
| Frequency Response | 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 TRN MT3 from aftersound, ankramutt, eplv, harpo, hbb, ianfann, iemworld and vortexreviews, all via squig.link.
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