Short answer: the Tin HiFi P2 Ultra. Both are rated 3.5/5 for sound quality (#797 and #810 of 1291 in-ear headphones), and the Tin HiFi P2 Ultra costs $599 against $619 for the DUNU SA6 EST, and with sound quality even, the cheaper one is the better buy.
Why pick the DUNU SA6 EST: A broadly balanced tuning with a preference score of 68 against the Harman target. The tradeoff: Treble about 6 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
The case for the Tin HiFi P2 Ultra: A 12mm planar IEM in a gold plated shell with bass right on the Harman target, scoring 68 across five measurements. The tradeoff: Treble sits about 4.7 dB below target, a dark, relaxed balance.
Buy the Tin HiFi P2 Ultra. Both are rated the same for sound quality, and it costs $20 less than the DUNU SA6 EST.
Looking for alternatives? See the complete Headphones rankings.
A broadly balanced tuning with a preference score of 68 against the Harman target.
Amazon $619 eBay
A 12mm planar IEM in a gold plated shell with bass right on the Harman target, scoring 68 across five measurements.
Amazon $599.00 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
| DUNU SA6 EST | Tin HiFi P2 Ultra | |
|---|---|---|
| Price | $619 | $599.00 |
| Ranked | #810 of 1291 in In-Ear Headphones | #797 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 68 (median of 7 squig.link measurements, calibrated to AutoEQ) | 68 (median of 5 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.55 dB standard deviation | 2.47 dB standard deviation |
| Tonal Tilt | -0.41 (negative is warmer, positive brighter) | -0.51 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.5 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-2.5 dB at 30 Hz) |
| Connection | Wired (3.5mm / 4.4mm modular) | Wired |
| Driver Type | Tribrid | Planar Magnetic |
| Drivers | 6 Balanced Armature, 2 Electrostatic | 1 x 12mm planar |
| Impedance | - | 32 ohms |
| Sensitivity | - | 98 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 DUNU SA6 EST from atechreviews, ducbloke, eliseaudio, kazi, precog, soundignity and superreview; the Tin HiFi P2 Ultra from atechreviews, audioamigo, csi-zone, ducbloke and soundignity, all via squig.link.
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