Short answer: the DUNU PRS6. Both are rated 4.3/5 for sound quality (#174 and #146 of 450 in-ear headphones), and the DUNU PRS6 costs $249 against $279.99 for the Tanchjim Oxygen, so with nothing between them on sound quality, price settles it.
What the Tanchjim Oxygen does well: Crinacle’s measurement gives it a preference score of 77, and across 22 hobbyist measurements its sub-bass lands right on target at 30 Hz, giving full, extended low end from a single 9.2 mm dynamic driver. The tradeoff: The presence band from 3 to 6 kHz falls about 2.2 dB short and a 4.7 dB dip near 10 kHz dulls cymbal edges and sibilants, in squig.link measurements.
Buy the DUNU PRS6. Both are rated the same for sound quality, and it costs $30.99 less than the Tanchjim Oxygen.
Still deciding? The full Headphones rankings cover every ranked option.
Specifications Side By Side
| DUNU PRS6 | Tanchjim Oxygen | |
|---|---|---|
| Price | $249.00 | $279.99 |
| Ranked | #174 of 450 in In-Ear Headphones | #146 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 77 (median of 3 squig.link measurements, calibrated to AutoEQ) | 77 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 1.78 dB standard deviation | 2.08 dB standard deviation |
| Tonal Tilt | -0.09 (negative is warmer, positive brighter) | -0.01 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.0 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+0.0 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 4 balanced armature + 1 MEMS) | Dynamic |
| Drivers | 1 x 10mm dynamic + 4 x balanced armature + 1 x MEMS | 1 x 9.2mm dynamic |
| Impedance | 43 ohms | 32 ohms |
| Sensitivity | 112 dB/mW | 110 dB |
| Frequency Response | 5Hz - 40kHz (Manufacturer specified) | 10Hz - 40kHz (Manufacturer specified) |
| Weight | 0 lbs (9 g) per earbud | - |
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More worthwhile head-to-heads for Tanchjim Oxygen:
- Myer Audio SLIIVO SL-41 Pro vs Tanchjim Oxygen
- Tanchjim Oxygen vs Tanchjim x Effect Audio Force
- DUNU PRS6 vs Kiwi Ears Orchestra Lite
- Aful Performer 5 vs DUNU PRS6
- Aful Performer 7 vs DUNU PRS6
Prices on this page were last checked October 11, 2026 at 4:59 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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The Two Headphones In Full
DUNU PRS6: $249.00 HiFiGo eBay
Full DUNU PRS6 review and specifications →
| Released | Sep 2026 (new) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 1.78 dB standard deviation |
| Driver Type | Hybrid (1 dynamic + 4 balanced armature + 1 MEMS) |
| Drivers | 1 x 10mm dynamic + 4 x balanced armature + 1 x MEMS |
| Form Factor | In-ear |
| Frequency Response | 5Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 77 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 43 ohms |
| Sensitivity | 112 dB/mW |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.0 dB at 30 Hz) |
| Tonal Tilt | -0.09 (negative is warmer, positive brighter) |
| Weight | 0 lbs (9 g) per earbud |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Tanchjim Oxygen: $279.99 Apos Audio eBay
Pros: Crinacle’s measurement gives it a preference score of 77, and across 22 hobbyist measurements its sub-bass lands right on target at 30 Hz, giving full, extended low end from a single 9.2 mm dynamic driver. Bass from 60 to 200 Hz sits about 1.9 dB above target for a warm, punchy balance that bass lovers will enjoy. At 32 ohms and 110 dB sensitivity it plays loud from a phone.
Cons: The presence band from 3 to 6 kHz falls about 2.2 dB short and a 4.7 dB dip near 10 kHz dulls cymbal edges and sibilants, in squig.link measurements. The response is less even than the best, at 2.08 dB standard deviation. The Etymotic EVO and Moondrop Blessing earn higher ratings for a little more money.
Full Tanchjim Oxygen review and specifications →
| Released | 2019 (7 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 2.08 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 9.2mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 10Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 77 (measured by crinacle, via AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 110 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.0 dB at 30 Hz) |
| Tonal Tilt | -0.01 (negative is warmer, positive brighter) |
EQ preset to match the Harman target
Set a preamp of -3.4 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +6.2 dB | 0.70 |
| Peak | 61 Hz | -4.2 dB | 0.27 |
| Peak | 7,413 Hz | +3.3 dB | 1.25 |
| Peak | 1,583 Hz | -3.2 dB | 1.12 |
| Peak | 932 Hz | +2.6 dB | 0.72 |
| High shelf | 10,000 Hz | -2.7 dB | 0.70 |
| Peak | 3,484 Hz | +1.0 dB | 3.64 |
| Peak | 4,684 Hz | -0.8 dB | 3.96 |
| Peak | 2,479 Hz | -0.6 dB | 3.43 |
| Peak | 3,964 Hz | +0.4 dB | 2.70 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons