Short answer: the Sennheiser IE 40 Pro. It ranks #817 of 1291 in-ear headphones by sound quality, rated 3.5/5, at $109; the Letshuoer DX1 ranks #850, rated 3.4/5, at $109. The price gap is small enough that the sound-quality ranking should decide it.
The case for the Sennheiser IE 40 Pro: Oratory1990’s measurement shows bass 1.0 dB and low mids 1.4 dB above target, a gentle warmth that suits relaxed listening, and the preference score of 67 is acceptable. Watch for: Presence is 4.5 dB under target across 3 to 6 kHz, with a 6.4 dB dip near 3.1 kHz, so vocals and guitars sound recessed and detail is dulled.
Why pick the Letshuoer DX1: Lower mids sit within about 0.5 dB of target, keeping voices and guitars natural. Watch for: Presence sits about 6.2 dB low with an 8.9 dB dip near 10.3 kHz, so vocals and instruments lose some bite.
Buy the Sennheiser IE 40 Pro. It is rated higher for sound quality than the Letshuoer DX1 at the same price, which makes it the one to get unless you need something the other one does better.
Looking for alternatives? See the complete Headphones rankings.
Oratory1990’s measurement shows bass 1.0 dB and low mids 1.4 dB above target, a gentle warmth that suits relaxed listening, and the preference score of 67 is acceptable.
Amazon $109.00 eBay
Lower mids sit within about 0.5 dB of target, keeping voices and guitars natural.
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Specifications Side By Side
| Sennheiser IE 40 Pro | Letshuoer DX1 | |
|---|---|---|
| Price | $109.00 | $109.00 |
| Ranked | #817 of 1291 in In-Ear Headphones | #850 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 67 (measured by oratory1990, via AutoEQ) | 67 (median of 18 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.94 dB standard deviation | 2.51 dB standard deviation |
| Tonal Tilt | +0.03 (negative is warmer, positive brighter) | -0.40 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-5.1 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-2.5 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 1 x 11mm dynamic |
| Impedance | 20 ohms | 30 ohms |
| Sensitivity | 115 dB SPL/V | - |
| Frequency Response | 20Hz - 18kHz (Manufacturer specified) | 20Hz - 40kHz (Manufacturer specified) |
| Back | Closed | Closed |
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