Short answer: a tie on sound quality. Both are rated 3.6/5 (#746 and #770 of 1291 in-ear headphones) at nearly the same price ($22.99 vs $20.99), so choose on features and fit.
What the AGASound AGA One does well: A broadly balanced tuning with a preference score of 69 against the Harman target. Watch for: An uneven response, 2.1 dB standard deviation from target.
What the TRN MT4 does well: A very cheap 10mm dynamic IEM that measures close to the Harman target, with full sub-bass to 20 Hz (score 68 across six measurements). The catch: A 2.27 dB spread from the target still leaves some peaks and dips.
Buy the AGASound AGA One or the TRN MT4 on features: they are rated the same for sound quality at close to the same price.
Still deciding? The full Headphones rankings cover every ranked option.
A broadly balanced tuning with a preference score of 69 against the Harman target.
Amazon $22.99 eBay
A very cheap 10mm dynamic IEM that measures close to the Harman target, with full sub-bass to 20 Hz (score 68 across six measurements).
Amazon $20.99 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
| AGASound AGA One | TRN MT4 | |
|---|---|---|
| Price | $22.99 | $20.99 |
| Ranked | #746 of 1291 in In-Ear Headphones | #770 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 69 (median of 6 squig.link measurements, calibrated to AutoEQ) | 68 (median of 6 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.13 dB standard deviation | 2.27 dB standard deviation |
| Tonal Tilt | -0.61 (negative is warmer, positive brighter) | -0.67 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.7 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.1 dB at 30 Hz) |
| Connection | Wired (3.5mm) | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 Dynamic (10mm) | 1 x 10mm dynamic |
| Impedance | - | 22 ohms |
| Sensitivity | - | 115 dB |
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 AGASound AGA One from audioamigo, kuping-sensi, pw, soundignity, tdl and tonedeafmonk; the TRN MT4 from hbb, hore, ianfann, pw, timmyv and tonedeafmonk, all via squig.link.
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