Short answer: the Letshuoer S08. Both are rated 3.1/5 for sound quality (#966 and #978 of 1291 in-ear headphones), and the Letshuoer S08 costs $99 against $109 for the Kiwi Ears Quartet, so with nothing between them on sound quality, price settles it.
Why pick the Kiwi Ears Quartet: Bass is thick and punchy, sitting about 3.7 dB above target from 60 to 250 Hz with extension to 20 Hz, and tuning switches let you dial the low end up or down. The catch: The midbass lift makes some tracks sound boomy, presence dips about 4.3 dB with a 6.6 dB hole near 4.4 kHz, and a 6.3 dB treble peak near 8.2 kHz can sound splashy.
Why pick the Letshuoer S08: Its 13 mm planar driver keeps bass full and extended to 20 Hz across 29 measurements, with lower mids close to target. Watch for: The presence region is about 6 dB low with a 7.7 dB dip near 3.5 kHz, so vocals sound recessed and lack clarity.
Buy the Letshuoer S08. Both are rated the same for sound quality, and it costs $10 less than the Kiwi Ears Quartet.
Still deciding? The full Headphones rankings cover every ranked option.
Bass is thick and punchy, sitting about 3.7 dB above target from 60 to 250 Hz with extension to 20 Hz, and tuning switches let you dial the low end up or down.
Amazon $109.00 eBay
Its 13 mm planar driver keeps bass full and extended to 20 Hz across 29 measurements, with lower mids close to target.
Amazon $99.00 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
| Kiwi Ears Quartet | Letshuoer S08 | |
|---|---|---|
| Price | $109.00 | $99.00 |
| Ranked | #978 of 1291 in In-Ear Headphones | #966 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Hybrid | Planar |
| Drivers | 2 x 10mm dynamic + 2 x balanced armature | 1 x 13mm planar magnetic |
| Impedance | 32 ohms | 26 ohms |
| Sensitivity | 110 dB/mW | - |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 20Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 62 (median of 29 squig.link measurements, calibrated to AutoEQ) | 63 (median of 29 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.78 dB standard deviation | 2.73 dB standard deviation |
| Tonal Tilt | -0.75 (negative is warmer, positive brighter) | -0.75 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.4 dB at 30 Hz) |
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 Kiwi Ears Quartet from achoreviews, aden, adri-n, ankramutt, arc, atechreviews, audioamigo, bakkwatan, bassyalexander, bloomaudio, dentreviews, flare, hadoe, hbb, hobbytalk, joshtbvo, listener, mmagtech, musicafe, nymz, obodio, practiphile, precog, soundcheck39, superreview, suporsalad, tdl, therollo9 and tonedeafmonk; the Letshuoer S08 from achoreviews, aftersound, atechreviews, audioamigo, awsmdanny, banzai1122, breampike, cqtek, csi-zone, eplv, fahryst, flare, gadgetrytech, hadoe, hbb, jaytiss, koi, kuping-sensi, listener, lown-fi, lumerion, obodio, practiphile, pw, soundcheck39, soundignity, superreview, tonedeafmonk and vortexreviews, all via squig.link.
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