Short answer: the 7Hz Aero. It ranks #627 of 1291 in-ear headphones by sound quality, rated 3.7/5, at $14.99; the TRN MT1 ranks #687, rated 3.6/5, at $13.95. With prices this close, go by the sound-quality ranking rather than the cost.
What the 7Hz Aero does well: Across eight hobbyist measurements on squig.link it earns a Harman preference score of 70.6 with a smooth 1.97 dB deviation, an unusually even response for such an inexpensive single 9.2mm dynamic earphone. The catch: The 10 to 16 kHz air region runs about 5.3 dB above target, and a 5.3 dB peak near 8.4 kHz can make cymbals and sibilance a little splashy on bright recordings.
What the TRN MT1 does well: A preference score of 69 in crinacle’s measurement is a strong result for one of the cheapest in-ears around. The catch: A 10.4 dB peak near 11.9 kHz in hobbyist measurements on squig.link can make cymbals sound tizzy and fatiguing at volume, with a 6 dB dip at 6.5 kHz just below it.
Buy the 7Hz Aero. It is rated higher for sound quality, and saving $1.04 with the TRN MT1 does not make up for the sound-quality gap.
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Across eight hobbyist measurements on squig.link it earns a Harman preference score of 70.6 with a smooth 1.97 dB deviation, an unusually even response for such an inexpensive single 9.2mm dynamic earphone.
Amazon $14.99 eBay
A preference score of 69 in crinacle’s measurement is a strong result for one of the cheapest in-ears around.
Amazon $13.95 AliExpress $14.37 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 Aero | TRN MT1 | |
|---|---|---|
| Price | $14.99 | $13.95 |
| Ranked | #627 of 1291 in In-Ear Headphones | #687 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 71 (median of 8 squig.link measurements, calibrated to AutoEQ) | 69 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 1.97 dB standard deviation | 2.46 dB standard deviation |
| Tonal Tilt | -0.81 (negative is warmer, positive brighter) | -0.34 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+2.8 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.4 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 9.2mm dynamic | 1 x 10mm dynamic |
| Impedance | - | 22 ohms |
| Sensitivity | - | 106 dB |
| Frequency Response | - | 20Hz - 20kHz (Manufacturer specified) |
| Built-in Microphone | - | Yes |
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 Aero from achoreviews, aftersound, bassyalexander, musicafe, pw, silicagel, soundcheck39 and vortexreviews; the TRN MT1 from achoreviews, aftersound, ankramutt, bryaudioreviews, dchpgall, hbb, hoods, jacstone, lown-fi, melatonin, musicafe, pw and vortexreviews, all via squig.link.
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