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LETSHUOER S15 features a 14.8mm third generation dual chamber planar driver.
The configuration gives the S15 a broad sound stage, excellent transient response, and accurate sound reproduction.

To ensure smooth transitions between the octaves, LETSHUOER S15 employs a dual acoustic tubes structure with filter crossover scheme.
In short, an excellent sonic balance.

LETSHUOER S15 adds a 6mm passive filtering module outside the planar driver.
The passive filtering module is LETSHUOER's in-house R-Sonic Dynamic Harmonic Technology. Positive filtering of sound energy through proprietary filters.

LETSHUOER S15 cavity has been ergonomically polished to fit most people's ear shapes, providing both stability and comfort.
The internal structure of the cavity has been precisely optimized, contributing to the precise acoustic configuration and extremely low distortion.

S15 adopts standard flush-mounted 0.78mm dual-pin receptacle.
Detachable 2.5mm, 3.5mm, 4.4mm 90-degree angle connectors come standard with the unit, making S15 compatible with various device.

LETSHUOER emerges from the meticulous craftsmanship and technical exploration of planar driver earphones.
Through engineers' countless iterations of plan revision and continuous optimization, it pays homage to the art of sound and earphone aesthetics.
I only have the S15’s for a couple of days but I can say that the S15 sounds different, warmer perhaps than the S12. More organic maybe, where the S12 is more ‘rough’ . For both IEM’s I use a Fiio KA17 dac/amp. The packaging of the S15 is excelent! But I miss foam tips. The built quality seems fine although I can’t really judge that after a fee days. But in all I am very pleased with these IEM’s.
Super
The headphones are well-built, appearing refined, sturdy, and durable. The sound is sweet and smooth, not harsh on the ears. The bass is of good quality, the vocals are sweet and rounded without being piercing, and the treble extends quite far with a noticeable sparkle, though not entirely on the same plane. The sound is comfortable and easy on the ears, suitable for extended listening. It's not the kind of sound that will immediately excite or thrill you, but if this is your preference, you've come to the right place.
exceeded expectations!
I've had the S15's for about a week now, and even without much break-in time they sound incredible. I've used earbuds throughout my life but have typically been a headphone listener, specifically open back headphones. I love my planar headphones and wanted to get some good IEM's, so a planar IEM made sense. I'm very impressed by the soundstage coming from these. Not quite as wide as you get in a traditional open back headphone, but MUCH wider than any earbuds I've ever owned. The detail and clarity is of course fantastic as planar's always are, but you don't lose any warmth. There is plenty of bass presence in the sound without being boomy. Without messing with any kind of EQ, I really love the sound signature coming from these.
The build quality of these is awesome, including the cord. I really don't feel any need to upgrade from the cord in any way, it is very well made. I love the design and fit/finish of the monitors themselves. The earbuds provided were nice, and after experimenting a bit I settled on the small size. They are taking a little bit of getting used to and my ears initially were a bit sore after listening for more than an hour at a time, but changing to the smaller size earbuds has helped.
I've tested mine using jazz (Bill Evans, Sonny Rollins, Charles Mingus, Miles Davis, Pat Metheny) orchestral (Arvo Part, Mahler Symphony No. 6 and 2) rock (Yes, Pink Floyd, Alice In Chains, Frank Zappa, Rush) and some acoustic country (Tony Rice) and everything I throw at them sounds fantastic.
The shipping took a little time coming straight from China, but really wasn't too bad and the tracking worked fine. The packaging is nice, though I plan to get a carrier for my DAP and earbuds in the future.
Highly recommended!