Short answer: a tie on sound quality. Both are rated 3.4/5 (#899 and #901 of 1369 in-ear headphones) at nearly the same price ($2.49 vs $2), so choose on features and fit.
What the BLON Shu does well: A broadly balanced tuning with a preference score of 66 against the Harman target. Watch for: Treble about 4 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
What the KZ Libra does well: A broadly balanced tuning with a preference score of 66 against the Harman target. The catch: An uneven response, 2.3 dB standard deviation from target.
Buy the BLON Shu or the KZ Libra on features: they are rated the same for sound quality at close to the same price.
Still deciding? The full Headphones rankings cover every ranked option.
A broadly balanced tuning with a preference score of 66 against the Harman target.
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A broadly balanced tuning with a preference score of 66 against the Harman target.
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Specifications Side By Side
| BLON Shu | KZ Libra | |
|---|---|---|
| Price | 2.49 | 2.00 |
| Ranked | #899 of 1369 in In-Ear Headphones | #901 of 1369 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 66 (median of 3 squig.link measurements, calibrated to AutoEQ) | 66 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.73 dB standard deviation | 2.28 dB standard deviation |
| Tonal Tilt | -0.33 (negative is warmer, positive brighter) | -0.86 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.3 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+1.9 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | Dual dynamic driver (1 x 10mm + 1 x 6mm composite diaphragm) | 1 x 10mm ultra-wideband dynamic driver |
| Impedance | 16 ohms | 25 ohms |
| Sensitivity | 118 dB/Vrms | 108 dB |
| Frequency Response | 20Hz - 20,000Hz | 20Hz - 40kHz |
Frequency Response Compared
Both headphones’ measurements overlaid on the Harman target. Above the target sounds louder in that range, below it quieter. Each curve is the median of several independent measurements, shifted so its 500 Hz to 2 kHz average sits at 0 dB, so only the tuning is compared.
Measurement data: the BLON Shu from audioamigo, kuping-sensi and soundignity; the KZ Libra from boizoff, eplv, obodio, soundcheck39, theaudiostore and treblewellxtended, all via squig.link.
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