Short answer: the Letshuoer S15. It ranks #946 of 1291 in-ear headphones by sound quality, rated 3.2/5, at $329; the Punch Audio Martilo ranks #967, rated 3.1/5, at $329. The price gap is small enough that the sound-quality ranking should decide it.
What the Letshuoer S15 does well: Its 14.8 mm planar driver keeps bass full, about 2 dB above target, and the lower mids accurate across 26 measurements. Watch for: The presence region is about 6 dB low with a 7.1 dB dip near 3.6 kHz, so vocals sound distant.
What the Punch Audio Martilo does well: Bass is lifted about 2.5 dB with extension to 20 Hz, giving kick drums and bass lines extra weight. The catch: A 5 dB peak near 11.9 kHz can make cymbals and sibilance sound sharp.
Buy the Letshuoer S15. It is rated higher for sound quality than the Punch Audio Martilo at the same price, which makes it the one to get unless you need something the other one does better.
Looking for alternatives? See the complete Headphones rankings.
Its 14.8 mm planar driver keeps bass full, about 2 dB above target, and the lower mids accurate across 26 measurements.
Linsoul $329.00 eBay
Bass is lifted about 2.5 dB with extension to 20 Hz, giving kick drums and bass lines extra weight.
Linsoul $329 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
| Letshuoer S15 | Punch Audio Martilo | |
|---|---|---|
| Price | $329.00 | $329 |
| Ranked | #946 of 1291 in In-Ear Headphones | #967 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Planar | Tribrid |
| Drivers | 1 x 14.8mm planar magnetic + passive radiator | 2 x 8mm dynamic + 2 x balanced armature + 1 x planar |
| Impedance | 30 ohms | 9 ohms |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 10Hz - 22kHz (Manufacturer specified) |
| Harman Preference Score | 64 (median of 26 squig.link measurements, calibrated to AutoEQ) | 63 (median of 24 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.74 dB standard deviation | 2.49 dB standard deviation |
| Tonal Tilt | -0.63 (negative is warmer, positive brighter) | -1.30 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.8 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+4.4 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 Letshuoer S15 from achoreviews, aden, aftersound, ankramutt, arn, atechreviews, audioamigo, cqtek, csi-zone, dchpgall, digaoreviews, eliseaudio, hbb, jaytiss, koi, mmagtech, obodio, practiphile, precog, pw, recode, soundcheck39, soundignity, superreview, therollo9 and tonedeafmonk; the Punch Audio Martilo from aden, aftersound, arn, atechreviews, avishai, bassyalexander, csi-zone, dl, ducbloke, iemocean, jaytiss, joycesreview, lestat, pw, silicagel, sl0the, soundcheck39, soundignity, superreview, takeitslow7, theaudiostore, timmyv, tonedeafmonk and treblewellxtended, all via squig.link.
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