Short answer: the KZ ASX, though neither ranks well in its class. It ranks #1158 of 1291 in-ear headphones by sound quality, rated 2.0/5, at $131.99. The 7Hz Legato ranks #1183, rated 1.8/5, at $109, $22.99 cheaper, not enough of a saving to outweigh the sound-quality gap. Both are rated below 3.0/5 among the 1291 in-ear headphones, so if sound quality matters, consider the Intuaura Reference 2019 instead, ranked #7 at $34.99.
What the KZ ASX does well: Ten balanced armature drivers per side run easily from a phone thanks to 20 ohm impedance and 106 dB/mW sensitivity. The catch: A deep 13.2 dB dip near 7.3 kHz and treble about 5.9 dB below target leave cymbals and detail dull, while a 5.1 dB peak near 1.7 kHz can make vocals sound pushy and nasal.
Why pick the 7Hz Legato: Bass is lifted about 5.1 dB with extension to 20 Hz, giving kick drums and bass lines extra weight. The catch: Presence sits about 5.2 dB low with a 6.8 dB dip near 4.3 kHz, so vocals and instruments lose some bite.
Buy the KZ ASX. It is rated higher for sound quality, and the $22.99 saving on the 7Hz Legato is not enough to make up the difference.
Looking for alternatives? See the complete Headphones rankings.
Ten balanced armature drivers per side run easily from a phone thanks to 20 ohm impedance and 106 dB/mW sensitivity.
Amazon $131.99 eBay
Bass is lifted about 5.1 dB with extension to 20 Hz, giving kick drums and bass lines extra weight.
Linsoul $109 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
| KZ ASX | 7Hz Legato | |
|---|---|---|
| Price | $131.99 | $109 |
| Ranked | #1158 of 1291 in In-Ear Headphones | #1183 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 49 (measured by crinacle, via AutoEQ) | 47 (median of 25 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 3.75 dB standard deviation | 3.63 dB standard deviation |
| Tonal Tilt | -1.04 (negative is warmer, positive brighter) | -1.61 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.5 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+4.6 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Balanced armature | Dynamic |
| Drivers | 10 x balanced armature | 1 x 12mm dynamic + 1 x 6mm dynamic |
| Impedance | 20 ohms | 26 ohms |
| Sensitivity | 106 dB/mW | - |
| Frequency Response | - | 10Hz - 20kHz (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 KZ ASX from eplv, hbb, melatonin, pw, superreview and vortexreviews; the 7Hz Legato from achoreviews, aftersound, ankramutt, audioamigo, bassyalexander, cammyfi, cqtek, csi-zone, fahryst, gadgetrytech, harpo, hbb, ianfann, mmagtech, musicafe, nymz, precog, pw, rg, soundcheck39, soundignity, theaudiostore, timmyv, tonedeafmonk, treblewellxtended, vortexreviews and vsg, all via squig.link.
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