Short answer: the Dita Project M. It ranks #912 of 1291 in-ear headphones by sound quality, rated 3.3/5, at $325; the Letshuoer S15 ranks #946, rated 3.2/5, and costs $329, so there is not much of a tradeoff to weigh.
The case for the Dita Project M: Bass sits close to target and holds down to 20 Hz, so low end sounds full without bloat. The catch: Presence sits about 7 dB low with a 9.2 dB dip near 3.9 kHz, so vocals and instruments lose some bite.
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.
Buy the Dita Project M. It is rated higher for sound quality than the Letshuoer S15 and costs less, so only choose the other one for a particular feature it does better.
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Bass sits close to target and holds down to 20 Hz, so low end sounds full without bloat.
Bloom Audio $325 eBay
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 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
| Dita Project M | Letshuoer S15 | |
|---|---|---|
| Price | $325 | $329.00 |
| Ranked | #912 of 1291 in In-Ear Headphones | #946 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Hybrid | Planar |
| Drivers | 1 x 9.8mm dynamic + 1 x balanced armature | 1 x 14.8mm planar magnetic + passive radiator |
| Impedance | 32 ohms | 30 ohms |
| Sensitivity | 107 dB/Vrms | - |
| Harman Preference Score | 65 (median of 11 squig.link measurements, calibrated to AutoEQ) | 64 (median of 26 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.86 dB standard deviation | 2.74 dB standard deviation |
| Tonal Tilt | -0.34 (negative is warmer, positive brighter) | -0.63 (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 (-1.8 dB at 30 Hz) |
| Frequency Response | - | 20Hz - 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 Dita Project M from aftersound, bloomaudio, csi-zone, ducbloke, eliseaudio, fahryst, gadgetgenerations, iemocean, jaytiss, kazi, lumerion, obodio, sl0the, soundignity, theaudiostore, therollo9, tonedeafmonk and treblewellxtended; 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, all via squig.link.
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