Short answer: the Astrotec GX100. It ranks #861 of 1369 in-ear headphones by sound quality, rated 3.4/5, at $49.90; the HeartField Blanc ranks #957, rated 3.3/5, at $49. With prices this close, go by the sound-quality ranking rather than the cost.
What the Astrotec GX100 does well: A broadly balanced tuning with a preference score of 67 against the Harman target. Watch for: Treble about 2 dB above target from 3 to 10 kHz, which can sound sharp or tiring at higher volume.
Why pick the HeartField Blanc: A published AutoEQ preset corrects its response toward the Harman target, so a few minutes of EQ setup closes most of the gap. The catch: An uneven response, 2.8 dB standard deviation from target.
Buy the Astrotec GX100. It is rated higher for sound quality, and saving $0.90 with the HeartField Blanc does not make up for the sound-quality gap.
Still deciding? The full Headphones rankings cover every ranked option.
A broadly balanced tuning with a preference score of 67 against the Harman target.
Astrotec $49.90 eBay
A published AutoEQ preset corrects its response toward the Harman target, so a few minutes of EQ setup closes most of the gap.
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Specifications Side By Side
| Astrotec GX100 | HeartField Blanc | |
|---|---|---|
| Price | $49.90 | 49.00 |
| Ranked | #861 of 1369 in In-Ear Headphones | #957 of 1369 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 67 (median of 4 squig.link measurements, calibrated to AutoEQ) | 65 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.39 dB standard deviation | 2.83 dB standard deviation |
| Tonal Tilt | +0.98 (negative is warmer, positive brighter) | +0.22 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-4.3 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-3.5 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid | Balanced Armature |
| Drivers | 1 DD + 1 PZT (1 x 10mm LCP dynamic driver + 1 x 10.6mm piezoelectric ceramic driver) | 5 balanced armature drivers per side |
| Impedance | 32 ohms | 15 ohms |
| Sensitivity | 108 dB | - |
| Frequency Response | 5Hz - 40kHz | - |
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 Astrotec GX100 from audioamigo, pw, soundcheck39 and tonedeafmonk; the HeartField Blanc from dl, gadgetrytech, jaytiss and silicagel, all via squig.link.
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