Short answer: the QoA Martini. Both are rated 3.5/5 for sound quality (#795 and #839 of 1291 in-ear headphones), and the QoA Martini costs $539.10 against $570 for the Artpical Blue Planet, and with sound quality even, the cheaper one is the better buy.
The case for 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.
The case for the QoA Martini: A six driver tribrid with a bone conduction driver, a dynamic driver and four balanced armatures. Watch for: Treble sits about 4.7 dB below target, a dark, relaxed balance.
Buy the QoA Martini. Both are rated the same for sound quality, and it costs $30.90 less than the Artpical Blue Planet.
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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 six driver tribrid with a bone conduction driver, a dynamic driver and four balanced armatures.
Linsoul $539.10 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 | QoA Martini | |
|---|---|---|
| Price | $570 | $539.10 |
| Ranked | #839 of 1291 in In-Ear Headphones | #795 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Planar Magnetic | Tribrid |
| Drivers | 1 x 12mm planar magnetic | 1 x bone conduction + 1 x dynamic + 4 x balanced armature |
| Impedance | 16 ohms | - |
| Sensitivity | 98 dB/mW @ 1kHz | - |
| Harman Preference Score | 67 (median of 4 squig.link measurements, calibrated to AutoEQ) | 68 (median of 5 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.45 dB standard deviation | 2.32 dB standard deviation |
| Tonal Tilt | -0.47 (negative is warmer, positive brighter) | -0.65 (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 (+0.3 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 QoA Martini from bassaudio, hu-fi, joycesreview, pw, soundcheck39 and soundignity, all via squig.link.
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