Short answer: a tie on sound quality. Both are rated 4.7/5 (#26 and #35 of 450 in-ear headphones) at nearly the same price ($22.99 vs $22.99), so choose on features and fit.
Why pick the Aoshida E20: Across six hobbyist measurements on squig.link, the E20 reaches a preference score of 82.6 with a smooth 1.13 dB deviation from target. Watch for: A 6 dB peak near 8.4 kHz and treble about 2.1 dB above target from 6 to 10 kHz can make sibilance and hi hats sound sharp on bright recordings.
What the DDHiFi Janus 3 does well: For a very low cost single dynamic in-ear, it measures a preference score of 82 in the median of four hobbyist measurements on squig.link. The catch: A 3.3 dB dip near 10.9 kHz dulls some cymbal shimmer, and the downward tilt toward bass makes it less suited to listeners who like a crisp, detailed top end.
Buy the Aoshida E20 or the DDHiFi Janus 3 on features: they are rated the same for sound quality at close to the same price.
Want more options? Browse the full Headphones rankings.
Specifications Side By Side
| Aoshida E20 | DDHiFi Janus 3 | |
|---|---|---|
| Price | $22.99 | $22.99 |
| Ranked | #26 of 450 in In-Ear Headphones | #35 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 83 (median of 6 squig.link measurements, calibrated to AutoEQ) | 82 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.13 dB standard deviation | 1.10 dB standard deviation |
| Tonal Tilt | +0.26 (negative is warmer, positive brighter) | -0.47 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.8 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+2.0 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic + 1 x 8mm dynamic | 1 x 10mm dynamic |
| Impedance | 12 ohms | 14 ohms |
| Sensitivity | 98 dB | 122 dB/Vrms |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 5Hz - 58kHz (Manufacturer specified) |
| Weight | - | 0 lbs (5.5 g) per earbud |
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- Aoshida E20 vs KZ Gale
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
Aoshida E20: $22.99 Amazon eBay
Pros: Across six hobbyist measurements on squig.link, the E20 reaches a preference score of 82.6 with a smooth 1.13 dB deviation from target. Sub-bass sits within a decibel of target down to 30 Hz, and the mids stay within about 1 dB, so vocals sound natural with solid bass underneath. Its dual dynamic driver design and budget price make it a sensible pick for warm or mildly V shaped tastes.
Cons: A 6 dB peak near 8.4 kHz and treble about 2.1 dB above target from 6 to 10 kHz can make sibilance and hi hats sound sharp on bright recordings. Bass from 60 to 200 Hz runs about 1 dB lean, so it has less punch than bass focused alternatives. It is rated level with similarly priced rivals such as the KZ EDZ and DDHiFi Janus 3 rather than above them.
Full Aoshida E20 review and specifications →
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 1.13 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic + 1 x 8mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 83 (median of 6 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 12 ohms |
| Sensitivity | 98 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.8 dB at 30 Hz) |
| Tonal Tilt | +0.26 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
DDHiFi Janus 3: $22.99 Amazon eBay
Pros: For a very low cost single dynamic in-ear, it measures a preference score of 82 in the median of four hobbyist measurements on squig.link. Sub-bass and bass sit about 1.5 to 2 dB above target, so it delivers a warm, bass rich sound that bass lovers will enjoy. At 14 ohms and 122 dB/Vrms it plays loudly from a phone, and each earbud weighs just 5.5 g.
Cons: A 3.3 dB dip near 10.9 kHz dulls some cymbal shimmer, and the downward tilt toward bass makes it less suited to listeners who like a crisp, detailed top end. Only four samples were measured, so the figures carry more uncertainty than for widely measured models.
Full DDHiFi Janus 3 review and specifications →
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 1.10 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 5Hz - 58kHz (Manufacturer specified) |
| Harman Preference Score | 82 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 14 ohms |
| Sensitivity | 122 dB/Vrms |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+2.0 dB at 30 Hz) |
| Tonal Tilt | -0.47 (negative is warmer, positive brighter) |
| Weight | 0 lbs (5.5 g) per earbud |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons