Short answer: the Tanchjim Oxygen. It ranks #146 of 450 in-ear headphones by sound quality, rated 4.3/5, at $279.99; the Tanchjim x Effect Audio Force ranks #209, rated 4.2/5, at $279.99. The price gap is small enough that the sound-quality ranking should decide it.
The case for the Tanchjim Oxygen: 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 catch: 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 Tanchjim Oxygen. It is rated higher for sound quality than the Tanchjim x Effect Audio Force at the same price, so only choose the other one for a particular feature it does better.
Still deciding? The full Headphones rankings cover every ranked option.
Specifications Side By Side
| Tanchjim Oxygen | Tanchjim x Effect Audio Force | |
|---|---|---|
| Price | $279.99 | $279.99 |
| Ranked | #146 of 450 in In-Ear Headphones | #209 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 77 (measured by crinacle, via AutoEQ) | 76 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.08 dB standard deviation | 1.95 dB standard deviation |
| Tonal Tilt | -0.01 (negative is warmer, positive brighter) | +0.10 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.0 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-3.9 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 9.2mm dynamic | 1 x 10mm dynamic + 1 x 8.2mm dynamic |
| Impedance | 32 ohms | 17 ohms |
| Sensitivity | 110 dB | 120 dB/Vrms |
| Frequency Response | 10Hz - 40kHz (Manufacturer specified) | 8Hz - 48kHz (Manufacturer specified) |
| Built-in Microphone | - | No |
Related Headphone Comparisons
More worthwhile head-to-heads for Tanchjim Oxygen:
- Myer Audio SLIIVO SL-41 Pro vs Tanchjim Oxygen
- DUNU PRS6 vs Tanchjim Oxygen
- Binary EP321 vs Tanchjim x Effect Audio Force
- Kiwi Ears Orchestra Lite vs Tanchjim x Effect Audio Force
- Yanyin Canon II vs Xenns Mangird Tea Pro
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
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
Tanchjim x Effect Audio Force: $279.99 Amazon eBay
Full Tanchjim x Effect Audio Force review and specifications →
| Back | Closed |
|---|---|
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 1.95 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic + 1 x 8.2mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 8Hz - 48kHz (Manufacturer specified) |
| Harman Preference Score | 76 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 17 ohms |
| Sensitivity | 120 dB/Vrms |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.9 dB at 30 Hz) |
| Tonal Tilt | +0.10 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons