Short answer: the Artpical Blue Planet. Both are rated 3.5/5 for sound quality (#839 and #810 of 1291 in-ear headphones), and the Artpical Blue Planet costs $570 against $619 for the DUNU SA6 EST, and with sound quality even, the cheaper one is the better buy.
Why pick the Artpical Blue Planet: A 12mm planar IEM with treble right on the Harman target and full sub-bass to 20 Hz, scoring 67 across four measurements. The tradeoff: A 2.45 dB spread from the target shows peaks and dips that better tuned sets avoid.
What the DUNU SA6 EST does well: A broadly balanced tuning with a preference score of 68 against the Harman target. The catch: Treble about 6 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
Buy the Artpical Blue Planet. Both are rated the same for sound quality, and it costs $49 less than the DUNU SA6 EST.
Looking for alternatives? See the complete Headphones rankings.
A 12mm planar IEM with treble right on the Harman target and full sub-bass to 20 Hz, scoring 67 across four measurements.
e-earphone (JP) eBay
A broadly balanced tuning with a preference score of 68 against the Harman target.
Amazon $619 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
| Artpical Blue Planet | DUNU SA6 EST | |
|---|---|---|
| Price | $570 | $619 |
| Ranked | #839 of 1291 in In-Ear Headphones | #810 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired (3.5mm / 4.4mm modular) |
| Driver Type | Planar Magnetic | Tribrid |
| Drivers | 1 x 12mm planar magnetic | 6 Balanced Armature, 2 Electrostatic |
| Impedance | 16 ohms | - |
| Sensitivity | 98 dB/mW @ 1kHz | - |
| Harman Preference Score | 67 (median of 4 squig.link measurements, calibrated to AutoEQ) | 68 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.45 dB standard deviation | 2.55 dB standard deviation |
| Tonal Tilt | -0.47 (negative is warmer, positive brighter) | -0.41 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.3 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-2.5 dB at 30 Hz) |
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 Artpical Blue Planet from aftersound, dchpgall, hu-fi and soundignity; the DUNU SA6 EST from atechreviews, ducbloke, eliseaudio, kazi, precog, soundignity and superreview, all via squig.link.
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