Short answer: the FiiO FH7S. Both are rated 3.2/5 for sound quality (#939 and #946 of 1291 in-ear headphones), and the FiiO FH7S costs $299.99 against $329 for the Letshuoer S15, so with nothing between them on sound quality, price settles it.
What the FiiO FH7S does well: Oratory1990 measured bass about 4.6 dB above the Harman target, so kick drums and bass lines hit with real weight for a hybrid built around a 13.6mm dynamic driver and four balanced armatures. The catch: Low mids run 2.4 dB hot on top of the bass lift, which can make male vocals and bass instruments thick.
Why pick the Letshuoer S15: 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 FiiO FH7S. Both are rated the same for sound quality, and it costs $29.01 less than the Letshuoer S15.
Want more options? Browse the full Headphones rankings.
Oratory1990 measured bass about 4.6 dB above the Harman target, so kick drums and bass lines hit with real weight for a hybrid built around a 13.6mm dynamic driver and four balanced armatures.
Amazon $299.99 Lowest AliExpress $363.17 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| FiiO FH7S | Letshuoer S15 | |
|---|---|---|
| Price | $299.99 | $329.00 |
| Ranked | #939 of 1291 in In-Ear Headphones | #946 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 64 (measured by oratory1990, via AutoEQ) | 64 (median of 26 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.76 dB standard deviation | 2.74 dB standard deviation |
| Tonal Tilt | -0.63 (negative is warmer, positive brighter) | -0.63 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.9 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-1.8 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 4 balanced armature) | Planar |
| Drivers | 1 x 13.6mm dynamic + 4 x balanced armature | 1 x 14.8mm planar magnetic + passive radiator |
| Impedance | 18 ohms | 30 ohms |
| Sensitivity | 104 dB/mW | - |
| Weight | 0 lbs (9 g) per earbud | - |
| Frequency Response | 10Hz - 40kHz (Manufacturer specified) | 20Hz - 40kHz (Manufacturer specified) |
| Back | Closed | Closed |
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 FiiO FH7S from ekaudio, jaytiss, precog, superreview and vsg; 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.
Related Headphone Comparisons
How FiiO FH7S compares with other leading options: