Short answer: the KBEAR Voyages SR-8. It ranks #741 of 1291 in-ear headphones by sound quality, rated 3.6/5, at $109; the Sennheiser IE 40 Pro ranks #817, rated 3.5/5, at $109. Close enough in price that the sound-quality gap is the deciding factor.
The case for the KBEAR Voyages SR-8: A hybrid with a liquid silicone dynamic driver and three balanced armatures. The catch: Bass sits about 2.6 dB above target, a bass heavy balance.
What the Sennheiser IE 40 Pro does well: 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.
Buy the KBEAR Voyages SR-8. It is rated higher for sound quality than the Sennheiser IE 40 Pro at the same price, so only choose the other one for a particular feature it does better.
Looking for alternatives? See the complete Headphones rankings.
A hybrid with a liquid silicone dynamic driver and three balanced armatures.
Amazon $109.00 eBay
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.
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Specifications Side By Side
| KBEAR Voyages SR-8 | Sennheiser IE 40 Pro | |
|---|---|---|
| Price | $109.00 | $109.00 |
| Ranked | #741 of 1291 in In-Ear Headphones | #817 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Hybrid | Dynamic |
| Drivers | 1 x 8mm dynamic + 3 x balanced armature | 1 x 10mm dynamic |
| Sensitivity | 107 dB +/-1 dB/mW @1kHz | 115 dB SPL/V |
| Harman Preference Score | 69 (median of 4 squig.link measurements, calibrated to AutoEQ) | 67 (measured by oratory1990, via AutoEQ) |
| Deviation From Target | 2.18 dB standard deviation | 2.94 dB standard deviation |
| Tonal Tilt | -0.62 (negative is warmer, positive brighter) | +0.03 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.3 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-5.1 dB at 30 Hz) |
| Impedance | - | 20 ohms |
| Frequency Response | - | 20Hz - 18kHz (Manufacturer specified) |
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