Short answer: the Anker Soundcore Liberty 4 NC, though neither ranks well in its class. It ranks #1082 of 1291 in-ear headphones by sound quality, rated 2.6/5, at $79.99; the KZ ZAS ranks #1104, rated 2.4/5, at $75.99. Close enough in price that the sound-quality gap is the deciding factor. Both are rated below 3.0/5 among the 1291 in-ear headphones, and the Intuaura Reference 2019, ranked #7 at $34.99, is a better place to start if sound quality matters.
The case for the Anker Soundcore Liberty 4 NC: These true wireless earbuds pack active noise cancelling, LDAC for higher bitrate streaming from Android phones, and IPX4 splash resistance. Watch for: A peak of 8.6 dB near 8.7 kHz adds sharpness to cymbals and sibilance, while the upper mids and presence region sit about 2 dB low, so vocals sound recessed behind the bass and treble.
The case for the KZ ZAS: Bass is lifted about 2 to 3 dB from 20 to 200 Hz, so bass-heavy genres have plenty of weight, and listeners with a bassy or warm taste are the best match. The catch: In hobbyist measurements on squig.link the presence range sits about 5.4 dB below target with a 7.5 dB dip near 3.4 kHz, which pushes vocals back and blurs detail.
Buy the Anker Soundcore Liberty 4 NC. It is rated higher for sound quality, and saving $4 with the KZ ZAS does not make up for the sound-quality gap.
Looking for alternatives? See the complete Headphones rankings.
These true wireless earbuds pack active noise cancelling, LDAC for higher bitrate streaming from Android phones, and IPX4 splash resistance.
Amazon $79.99 eBay
Bass is lifted about 2 to 3 dB from 20 to 200 Hz, so bass-heavy genres have plenty of weight, and listeners with a bassy or warm taste are the best match.
Amazon $75.99 eBayPrices on this page were last checked October 16, 2026 at 5:46 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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Specifications Side By Side
| Anker Soundcore Liberty 4 NC | KZ ZAS | |
|---|---|---|
| Price | $79.99 | $75.99 |
| Ranked | #1082 of 1291 in In-Ear Headphones | #1104 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 56 (median of 7 squig.link measurements, calibrated to AutoEQ) | 54 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 3.15 dB standard deviation | 3.18 dB standard deviation |
| Tonal Tilt | -0.90 (negative is warmer, positive brighter) | -1.30 (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 (+2.9 dB at 30 Hz) |
| Connection | True wireless | Wired |
| Drivers | 1 x 11mm driver | 1 x 10mm dynamic + 7 x balanced armature |
| Weight | 0 lbs (5.2 g) per earbud | - |
| Active Noise Cancelling | Yes | - |
| Battery Life | 10 hours (50 with case, Manufacturer specified) | - |
| Bluetooth Version | 5.3 | - |
| Bluetooth Codecs | SBC, AAC, LDAC | - |
| Built-in Microphone | Yes | - |
| IP Rating | IPX4 | - |
| Driver Type | - | Hybrid (1 dynamic + 7 balanced armature) |
| Impedance | - | 24 ohms |
| Sensitivity | - | 109 dB |
| Frequency Response | - | 10Hz - 40kHz (Manufacturer specified) |
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 Anker Soundcore Liberty 4 NC from aftersound, dhrme, fernandagunsan, flare, jaraba, regancipher and soundignity; the KZ ZAS from ducbloke, eplv, hbb, ianfann, melatonin, precog, pw and vortexreviews, all via squig.link.
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