SYLLABLE D900S Mini Wireless Bluetooth Earphone Waterproof Invisible Auriculares Noise Canceling Earbuds Micro Stereo Headset (black)

General Information

Product technologies: Brand: Syllable Model: D900S Bluetooth version: V4.0 CSR8670 Supported protocols: ACRCP A2DP HSP HFP APTX Battery capacity: 65mA Charging Voltage: 5V Connection distance: 10M Speaker diameter: 8mm Microphone Sensitivity: -42dB ± 3dB Frequency range: 20-20,000HZ Impedance: 16 OHM Waterproof grade: IPX4 Main features: call, listening to music The main material: PC + ABS Packing size: 11 * 15.5 * 5.2cm Life time: 4 hours (battery box can provide 6 charge) Standby time: 90 hours Charge time: 1 hour (including battery box) Talk time: 4 hours Music Time: 4 hours Weight: 8g (single earphone) Products include: 1x D900S Bluetooth Headset 1x Intelligent Charging Box 1x USB charging cable 1x String 1x User manual 1x Ear buds

Latest reviews

Pros: Massive bass energy. Not a wire in sight. Potent bass.
Cons: No wires at all costs. Very bass heavy, flavoured sound.
Syllable D900 Mini Bluetooth Earphone Quick Review by mark2410
Thanks to Syllable UK link US link for the sample.
Full review here
Brief:  If ever there were Uhura earphones, it is these.
Price:  £40 or US$50
Specifications:  Brand: Syllable, Model: D900MINI, Color: Black, Bluetooth version: V4.1, Impedance: 16 ohms, Power level: CLASS II, Working Voltage: 3.2V - 4.2V, Sensitivity: -42dB±2dB, Frequency Range: 2.4-2.48Ghz, Talk/Listening time: Up to 120 minutes listen or talk, Standby time: Up to 8 days, Auto Power-Off technology: Power off when no connectivity for 5 minutes., Operating distance(range): Up to 10m/33 feet, Headphones weight: 5 grams per earbud, Noise reduction: Full duplex echo cancellation; Real time noise reduction; Voice clarity, Moisture protection: Design for sweat and moisture protection, Charge connector: Micro USB charging, Battery type: Rechargeable, non-replaceable lithium-ion polymer, Bluetooth 4.1 + EDR: Advanced Audio Distribution Profile (A2DP), Audio Video Remote Control Profile (AVRCP), Hands-free Profile (HFP) and Headset Profile (HSP)
Accessories:  3 x Eartips, 1 x Charging Station, 1 x Micro USB charge cable, 1 x User Manual
Build Quality:  Sweat resistant and seem mostly fine, though the mesh filter disappeared on one of mine.
Isolation:  Not very much.  They are rather open backed so they don’t isolate a lot.  So not one I’d want for noisy commutes, Tube or flights and I’m not sure I’d love for bus use either.  Still if you’re out for a run with music playing you won’t hear traffic so please do use your eyes, or get a donor card.
Comfort/Fit:  Well it’s a little odd at first, nothing to go over the ear at all, was strange.  However once they are in and in a few minutes you pretty much forget they are there at all.  They are a bit bass heavy tiring on the ear but physically, even shaking my head about to the point I had to sit down on the floor, they never moved or needed tweaking.  Cool.
Aesthetics:  Hmm not sure they are the best lookers ever but the whole, zero wire thing, anywhere that does certainly look cool.  I like them.
Sound:  All about that bass.  Yep these are big old bass cannons.  No ifs no buts, bass, seriously big bass, heavy thumping, powerful, grrrrrrr, crushing bass.  So I wasn’t super pleased as it was too much for me but for you, well many people like tons of bass.  It’s very big, weighty stuff.  The mids are fine, a bit over thick and warmed but fine.  The treble, its over thick and warmed too.  Still if you’re playing mainstream pop, rhythmic thumping tunes then it’s not like you need revealing nuanced treble to point out that you’re listening to badly mastered stuff.  These are really bass heavy, thumping party, energy cannons that is meant to power you through a gym session, huge, vast power driving the music and you ever onward.
Value:  Good, you pay for having zero wires anywhere but many more for a month of gym membership so it’s not exactly bank breaking.
Pro’s:  Massive bass energy.  Not a wire in sight.  Potent bass.
Con’s:  No wires at all costs.  Very bass heavy, flavoured sound.


Reviewer for The Headphone List
ryanjsoo's Reviews
Pros: Lightweight, Fully wireless, End to end extension, Accessories and dock are of high quality, IPX4 water resistance
Cons: Harsh high end, thin midrange, Impossible to get a proper fit or seal, Enormous housings, Constant wireless dropouts, Hiss, Clanking buttons, Eartips

[size=17.03px]Introduction – [/size]


The original d900 from Syllable made quite a splash when it first arrived on the market. It was one of the very first fully wireless earphones ever produced. Furthermore, it was pretty cost effective, retailing for just $90 USD, cheaper than most semi-wireless sets. The earphones were pretty popular, featured on Unbox Therapy, PC Mag and a few other review sites. However if there`s one link between all of these articles, it`s probably their lukewarm reception and complaints of average sound quality and connection drops. Recently, Syllable have updated the d900, the new model bearing the d900s moniker. Bringing additional features such as apt-x and vastly improved batterylife, the new “s” model seeks to address the weaknesses of its progenitor at the same tempting RRP.


Disclaimer – 

I would like to thank George from Gearbest for providing me with a review unit in exchange for my honest opinion. I am not affiliated with Syllable or Gearbest, nor it there any monetary incentive for a positive review. I will be as objective as possible about the d900s and provide an honest evaluation of the product.


Accessories – 

The d900s have a pretty impressive un-boxing experience on a whole. They come within a small box that displays a nice promo image of the d900s on the front and a small diagram explaining the various features on the back accompanied by text description in a few different languages. The print was a little washed out but otherwise the box presents well.


The top lid slides off to reveal the d900s housed within their dock and a smaller box that contains the accessories and manual. The d900s are outfitted with a variety of accessories, in addition to the included dock/case, Syllable includes a soft pouch, adjoining band and micro-b charging cable. Syllable also include a quick start card which lists a few steps to quickly start and connect the d900s. The d900s come with two pairs of silicone tips including those installed on the earphones, a medium and large sized set.

They`re a double flange tip with small stabilizer fins. Unfortunately I found them to be thin and flimsy and I couldn`t get a proper fit with the either size. The fins are also pretty thin, they`re not shaped correctly and don`t contribute much to stability at all.


But apart from the tips, the included accessories are all of good quality. The cables are flat and moderately thick and the pouch seems to be hard wearing too. The star of the show is undoubtedly the dock.

The bottom has a tactile matte finish whilst the top is transparent to display the d900s themselves. The dock has two cradles that charge the earpieces via charge a minute two prong connector. The earpieces are firmly lodged within the cradle once the transparent lid is closed. As such, they don`t rattle around during travel and, despite the small connectors, the d900s charged reliably in my testing. There`s a cutout at the top that allows for the use of larger tips and 4 blue LEDs just below that display remaining charge of the dock itself.


The plastics used are very thick and the dock feels well put together. Perhaps the clipping mechanism that holds the top cover down is a little stiff and it could also do with some small rubber feet as it tends to slide around on the table and scratch. Otherwise, it`s a really neat looking piece of kit that adds another dimension to the d900s usage and looks. Syllable well equip users with all the accessories they`ll need to confidently use their d900s.


Design – 

It`s here that the d900s begin to lose some some of their appeal. As a fully wireless earphone, the d900s have no external battery pack or receiver module. Instead, each earpiece contains all of the circuitry within. Whilst great in theory, this does make the d900s quite enormous for an “in-ear”. Syllable have tried to balance the size through a very smooth, tapered design that sits mainly in the outer ear.

It works to some extent, helped in part by the very light weight of the housings, but the d900s are simply too bulky to achieve a stable fit. No matter what angle I tried I simply couldn`t get a proper seal and thus bass response. Eventually I found that wearing them backwards achieved a decent fit. It`s not ideal since the nozzles are slightly angled and the buttons face backwards but this fit allows the body of the earphone to lodge under the outer ear, providing stability.

My struggles to achieve a decent fit were only exacerbated by the rubbish included tips, short nozzle and limited insertion depth which prevents the use of many aftermarket tips too. The d900s have a 200 size bore with a slightly oval nozzle that keeps the included tips in the correct orientation. Using an inverted fitment, I did manage to use the d900s with Sony hybrids, the oval nozzle wasn`t a problem and noise isolation was pretty good. The stock tips gave an unreliable fitment. When I did manage to achieve a stable fit, they produced only a partial seal and minimal noise isolation. I was expecting a pretty decent fitment, perhaps something similar to that of Bose`s earphones, sadly that`s not the case.


The housings themselves are gloss, available in black and white. They`re a little slippery, especially with their very rounded features, but their large size makes them easy to handle. As aforementioned, they`re also very lightweight, they don`t disappear in the ear, but considering their size, they`re not as cumbersome as you would imagine. The d900s is not the most sturdy or premium feeling earbud, the plastic feels thin and visible seams run the perimeter, the inner and outer housings don`t quite marry up leaving some rough edges. In addition, the buttons feel pretty average, with a mushy click and limited travel. They loosely fit within the housings, causing them to rattle during any kind of movement. This noise is amplified when the earphones are inserted within your ears and the constant clanking of the buttons gets quite obtrusive over longer sessions. Despite this, buttons worked reliably, registering every click in my testing. On a more positive note, the housings have an IPX4 water ingress rating. They should withstand sweat and getting splashed with water, but you can`t submerge them nor would I try to wash them under running water. I can see that the d900s were designed for sport use, as these wireless buds generally are, but the fitment was not nearly stable enough for my usual 6K run or even weight training. The most the d900`s could handle was general commuting and walking which, apart from the occasional dropout and wind noise, they were quite practical for.

Being a fully wireless earphone, a common complaint may be that the earpieces are easy to lose. Syllable include a rubber band to adjoin the two earpieces which some users may prefer. It`s well molded and a more matte over tacky rubber. The loops that connect to the d900s are slightly triangular to maintain correct orientation. The band is a nice and simple way of dealing with a potential problems associated with completely wireless buds, the band has saved my set from a few tall drops at the very least.


So the word frustration probably sums up my experiences with the design. I can`t comment on whether the d900s is superior to the original d900, but I was expecting a much more stable fit considering that there`s no cable to hold the earbuds in place. Perhaps the d900s just need a memory wire ear loop, but a smaller, more ergonomically shaped housing would go a long way to improve comfort and fitment. This also made it very difficult to evaluate the d900s audio performance as achieving a proper seal was pretty much impossible. Unless you have abnormally large ears, the d900s are unlikely to fit or seal properly. Of all my immediate family and friends, only one or two could get a decent fitment, the rest had an experience similar to mine.


Usage – 

The buttons on the outer faces of both earpieces handle power with just the right one controlling pairing and media controls. The perimeter illuminates to display various statuses; they glow red whilst charging (and turn off when finished) and alternate red/blue when in pairing mode. The earphones also produce various audio cues to make the process of power and pairing easier. Initial setup and usage is relatively simple, rather than pairing to both earpieces from the source, you simply pair with the right earpiece which then relays a stereo signal to the left driver. Both earpieces come paired to each other from factory to save you some hassle, but they can be easily re-paired if an error occurs.


As far as pairing goes, simply hold down the button on the right earpiece for 4 seconds, the LED alternates red and blue and the d900s enter pairing mode. Pair the d900s with your device (they appear as SYLLABLE TIP) and turn on the left earpiece. It should promptly connect to the right one and audio will play through both. In actual use, I found that pairing and connecting each earpiece was simple and reliable. Sometimes audio played only through the right earpiece, but simply pausing and un-pausing the source allowed the left earpiece to establish a connection.


If you`ve read about the d900 or even read a few d900s reviews, you will probably hear a lot about dropouts. In my uses, dropouts were unfortunately very common regardless of source. Some sources were more reliable than others, my apt-x enabled HTC M8 for instance provided a more reliable signal than my laptop (Windows 10) and iPod Nano 7G, but even listening from my phone, dropouts occurred every 1-2 minutes. It is a quick dropout, lasting about a second, and I did appreciate how the sound gently fades in and out rather than just cutting out abruptly, but these frequent dropouts easily become distracting, especially when listening to dialogue in a video/movie. This was more of an issue with the left driver than the right one but the right earpiece still cut out a few times too (which in turn led to audio loss in the left driver). Any obstruction, such as placing my hand over the earpiece would cause a complete loss of signal and wireless range was similarly poor; any distance over ~2m would cause either very intermittent or a complete loss of audio. It`s very unfortunate really and dropouts occurred even when holding my phone to my ear, it makes for a very jarring listen. It would be interesting if Syllable could include a cable instead of a  band to connect both earpieces, as the most frequent dropout I experienced was between the left and right earpieces. A cable connecting each would be less cumbersome than a traditional wireless earphone and would solve the majority of dropout issues users are reporting whilst retaining the option to go fully wireless.

Due to the nature of a fully wireless earphone, the d900s can be used in mono. Both the left and right will pair to a phone and play in isolation, but only the right will pass through remote commands from the button. I can see a few users finding this useful.

The right button also acts somewhat like a multi-function button. A single press controls the play/pause function, but a double press phones the last caller instead of skipping tracks. This behavior occurred on both my HTC M8 and Galaxy S6 Edge, only the single press function worked on my Windows laptop and iPods. Triple clicking the button had no function. It`s an odd choice, but play/pause is more than sufficient and, in culmination with the built-in microphone, allows the d900s to function as a pretty decent hands-free set as well.


Each earpiece houses an internal battery that can only be recharged via the included dock. The dock doubles as a case to protect the d900s during travel and charges the earpieces from its inbuilt 1000mah battery. it`s recharged through the micro-b port on the right side and is activated through the power button on the front (single press activates charging).


Pressing the button illuminates the 4 LEDs at the front of the dock that display the remaining charge of the dock itself. Syllable claim 4 hours of playback from the d900s. At low volume, I managed to get around 3 and a half, perhaps you`ll be able to reach the 4hr mark when connected over a regular Bluetooth 4.o connection (not apt-x), but I couldn`t get reliable sound from any other source. Each earpiece has a 65mah that takes 2 hrs to charge from empty, you can expect around 6 charges from the dock`s internal cell.


Sound –

Quickly perusing some reviews of the original d900, many complained about the “flat” sound. I doubt those who achieve a decent seal with the d900s will have any such complaints. The 8mm dynamic driver d900s have a V-shaped sound in general, bass has an overall emphasis, there`s a dip in lower mids and increasing prevalence heading into the upper midrange. Treble is slightly accentuated avoiding fatigue. The sound has a thinner character to it in general.

The soundstage is mediocre at best. Of course since I had difficulties achieving a proper seal this might affect my experience, but in general, the sound was congested and diffuse. There`s not a great sense of separation to the sound and imaging is inaccurate with sound being pushed to the sides with little in the centre. It`s a very unorthodox presentation, at least the soundstage has decent width if limited depth.

There`s a constant hiss that`s quite evident when the earphones are in use. Considering the price and size constraints of the earphones, the hiss is hardly distracting, but it`s almost always noticeable for those more sensitive to white noise. The d900s have no volume controls, volume can only be changed from the source. I found them to offer a good mix of adjust-ability with plenty of volume for louder listeners.


Bass – 

Bass is very full and pretty well extended when you have an adequate seal. Sub-bass has the greatest boost with decreasing emphasis as the sound moves onto the midrange. I`m assuming this is to combat the loose seal of the stock tips, as they sound relatively flat with a partial seal. As a result of this tuning, there is no bass spill but rather the contrary, lower mids are left a bit thin without adequate body. This grants a lot of slam and impact to the sound whilst retaining a clearer sound and the d900s avoid overly warming the low end. Sub-bass has too much emphasis for my tastes, it sounds great for pop but other genres tend to sound muddy and off balanced. There`s definite detail and definition loss due to the sub/mid-bass boost. Buyers coming from consumer earphones might not enjoy the recessed upper-bass which saps body and warmth from the sound.

Mids – 

Despite the low-end emphasis, the midrange on the d900s has quite a bit of presence and clarity. Lower mids are slightly over shadowed by the bass but there is minimal spillage. I found the lower midrange to sound slightly thin, even hollow with certain tracks. Male vocals and acoustic are pushed back in the mix whilst upper mids are actually quite forward. This is unfortunate since upper mids tend to sound harsh and peaky. The majority of music I tested the d900s with sounded slightly metallic, female vocals in particular sounded thin and strangely nasal. There is some benefit to this tuning however, as the upper midrange somewhat balances out the bass emphasis and upper mids do have quite a bit of clarity. With some songs, namely K-pop where female vocals are already quite forwards, the upper midrange of the d900s can be excessive, overwhelming other frequencies. Despite this character, there`s an absence of detail to the midrange on a whole whether connected over apt-x or not. They`re not terrible and completely listenable, but for $100, considering the feature set, I would hope that they would compete with earphone that cost even half the price, sadly many better options can be easily found.

Highs – 

Treble has great extension but the quality of the treble is only average. Treble has a slight roll off at the very top, high-hats are pushed more into the background, but sound quite accurate. That describes the treble in general really, cymbals, effects and higher vocals all sound accurate just pushed either forwards or backwards in the mix. The treble isn`t particularly well detailed but it`s also relatively un-fatiguing and inoffensive especially considering the harsh upper midrange of the d900s. Perhaps the more sedated upper treble adds to the general congestion of the soundstage, there`s little separation to the sound and a lot of details are lost.

Comparisons – 


To make things more interesting, I`ll compare the d900`s to another earphone that costs around the same amount, the Klipsch X10 (~$100 online). The X10`s immediately impress over the d900s with a far more comfortable, stable and isolating design. The housings are absolutely dwarfed by the d900s, I believe the x10`s were once the smallest earphone on the market. The machined copper housings also feel nicer than the plastic bulbs of the d900s. So despite being wired, the x10`s are far more comfortable and the level of seal produced is simply not viable from the bulkier d900s. There are downsides to this level of seal, for instance, there`s a lot more cable noise on the x10`s, that`s a given since the d900s have no cables, but the d900s rattling buttons are arguably just as intrusive. In terms of sound, the differences are just as pronounced. The X10`s are much smoother with a more sedated high end and a lusher low end. The dynamic driver d900s actually possess more end to end extension, I feel they have more treble extension and similar if ever so slightly more sub-bass extension. The d900s have a lot more sub-bass, similar mid-bass but less upper-bass. So while the d900s sound thin throughout the midrange, the x10`s instead sound fuller than neutral which flatters more genres of music and applications in general. Such tuning is not always beneficial, it`s very easy to overly warm the midrange and create a muddy mess, but in this instance, the x10`s undoubtedly have the upper hand. It`s really the high end where the x10`s outshine the d900s. The d900s, while reasonably clear, sound artificial and thin. Female vocals, piano and strings all come through as harsh and at times, metallic, the treble having a similarly thin character, but not to the same extent. The x10`s are much smoother and more laid-back, with a nice vocal presence that avoids being overly forwards and peaky. Vocals have more body, instruments more accurate timbre and on a whole, the sound is so much more invigorating.

Gearbest currently have a special on, if you use the code “LHSY”, the d900s can be had for a $40 discount, bringing them down to $50. At this price, the sound is quite good, and the feature set is all the more impressive. But again, I have a hard time recommending them simply due to the ergonomics and wireless dropouts; It really doesn`t help that Shozy`s $60 Zero in-ears sounds subjectively better than the Klipsch X10`s which, in turn, make mince meat of the d900s.


Verdict – 

In all honesty, the d900s are not a bad sounding earphone, my initial impressions were rather pretty positive. But over time the character of the upper midrange, the sub-bass bloat and other small niggles did add up. From the aforementioned comparisons, it`s clear that the d900s lack the audio finesse that most other earphones possess in this price range. I`m not saying that you should ditch the d900s and buy the Klipsch x10`s or Sozy Zero`s instead, they were just earphones I had on hand that were in a similar price range; this comparison was purely intended to illuminate the performance cost of wireless technologies. Whether the additional features of the d900s are worth it is is up to the buyer, but the compromises in ergonomics and sound make them a hard product to recommend.


As for the d900 vs the d900s, the addition of new accessories, new features and apt-x support all promise a genuinely improved experience. But theory and application are completely separate and at the end of the day, I have a hard time quantifying whether the additions within the new “s” model bring any real life improvements. There`s more to a wireless earphone than just slapping together a generic driver, an apt-x enabled Bluetooth receiver and building an awkward housing around it. As much as I wanted to like the d900s, neither the wireless nor audio performance really deliver and the ergonomic difficulties don`t help Syllable`s case either. It`s unfortunate really because you can see some genuine thought went into the original d900, but Syllable have failed to address key concerns from its preceding model and the d900s arrives ill-equipped in an even more competitive environment. For $100, many earphones both wired or wireless will best the d900s. Although a fully wireless design such as this is very uncommon at this price point, there`s a reason why most of the competition are priced so much higher, the d900s simply have too many compromises and few redeeming talents.

Accessories – 8/10, Nice un-boxing, great set of accessories. The included case is fantastic, the adjoining band is thoughtful and the pouch is a nice touch. Syllable really cheaped out on the eartips, they`re flimsy  and lacking in general.

Design – 2.5/10, The d900s look unique but feel cheap. The housings are ridiculously large and achieving a proper fit is almost impossible. Both buttons rattle with a mushy feel and the earphones are poorly designed in general. IP4X water resistance is a nice addition, but the earphones are too unstable for any kind of activity anyway. At least the pairing process is simple because the wireless connection frequently cuts out.

Bass – 4/10, Good extension but too much sub-bass emphasis creates bloat. Mid-bass is punchy but recessed upper-bass creates a thin sound. Decent texturing with a little definition loss. More balanced with a weak/partial seal at the cost of extension.

Mids – 3/10, Lower mids are thin, upper mids sound harsh and hollow with older tracks. Peaky and lacking detail but with a nice sense of clarity.

Highs – 4/10, Slightly accentuated lower treble grants some excitement but a slight roll-off pushes certain sounds into the background. Again, not too much detail and a thinner character, but otherwise, everything sounds quite accurate.

Soundstage, Imaging and Instrument Separation – 2/10,Not really a soundstage to speak of, decent width but no depth creates congestion. Sound diffuses to the sides creating inaccurate imaging and a loss of separation.

Verdict – 3/10, I wanted to love the d900s, they`re innovative and I like that. There`s something strangely liberating about a fully wireless earphone, but in use, there`s just too many compromises. The fit is impossible, the wireless connection has frequent dropouts and the sound quality when you finally get everything else working is average at best. The packaging experience and included dock is pretty nifty but everything else feels half baked. I must reiterate that for the $90 USD RRP, many far better options can be found if you`re willing to sacrifice fully wireless functionality.

Thanks for reading! If you enjoyed this article please see my blog for more reviews like this and guides:

Excellent photos as always. I'm still on the fence about the GIFs, then again, I generally use them for entertainment purposes, so good on you for doing something more substantial.
Did you try other tips than the stock tips? I found I got a better, more secure fit, but that it didn't solve any of the usability issues.
Thanks, still experimenting with the GIFs, made cinemagraphs back in the day but we`ll see.
I tried a few different tips, Spinfits, Complies and Sony hybrids being the standouts. The hybrids and foams seemed to give a decent seal but it was the large housings that prevented a proper fitment, yet alone a comfortable one. I wanted to like the d900s, I`ll will gladly buy a d1000 if they can fix up the housing and wireless issues in particular, the sound is alright I guess. 
Pros: Good sound when it is stable, charging case is really cool
Cons: Unstable Bluetooth performance, problematic fit with stock tips, constant Bluetooth drop-outs (especially left earpiece), ginormous shell, look cheap


Thanks @George-gearbest of Gearbest, for the opportunity to participate in this review tour.  The Syllable D900S was provided to me as a review sample in exchange for my honest opinion. Thanks also for the understanding when I let you know that my review would not be positive.



I’ve reviewed a few Bluetooth headphones with mixed results, but none of those headphones was completely wireless, with a charging case—shiny shiny. The Syllable D900S represents what seems to be a growing consumer demand for a totally wireless Bluetooth solution. There are a couple totally wireless headphones out there, like the Bragi Dash ($300), and there are more to come like the Trinity Phantom Air—I have great hopes for the Phantom Air. Preceding this model was the Syllable D900, which didn’t have aptX codec capabilities could only be used for 1-2 hours and had a meagre standby time of 2-4 hours. It appears that the D900S gives something more usable. The purpose of the headset is advertised as being for sport or mobile phone use, so coming into this I was expecting a bassy, non-audiophile signature. The product is the only one of it’s kind in it’s price range, so my views will be couched in what the product is trying to do at it’s price point.
Like most sensible people I started falling in love with music as a child. My first portable audio device was a Sony Walkman (the cassette kind) that I got when I was 10 years old (24 years ago).  I listened with the cheap Sony on ears that came with the Walkman until I bought a Koss CD boombox and started listening to UAF College Radio and 103.9 (alternative rock at the time) in Fairbanks, Alaska. I once listened to Louie Louie for 3 days straight, and I’m not insane. My musical tastes started out with listening to what my friends liked (Dr. Dre and Green Day) and what my parents liked (The Beatles, Rolling Stones, Bob Dylan) and I only really discovered my own musical tastes and sonic preferences in my late teens to early 20s. What I discovered is that I have very eclectic and some would say weird tastes. I could be listening to gay punk rock, Japanese dream garble pop, 8-bit chiptune, Scandinavian black metal, Latin guitar, the Mariinsky Orchestra, or Miles Davis, but I mostly listen to Classic Rock and Indie/Alternative. I’m a big fan of intelligent hip-hop like Metermaids, Kendrick Lamar and Aesop Rock, also.
I tend to like headphones and gear that are all-around performers, this generally means a balanced or neutral sound. If I have to choose between warm and bright, I’ll choose bright almost every time. A few screechy high notes are preferable to me than a foggy unfocused bass guitar. I somehow never manage to have much money, so I don’t want to buy infinity headphones to switch between my myriad genres that I play. I can hear all the way down to 10hz and all the way up to 23Khz—these are what I’ve heard doing test tones on headphones. It has been a long time since I had a test with an audiologist. I’m sensitive to peaky treble but do enjoy smooth extended treble. I like deep rich tight bass and impactful drums, and dislike upper midbass emphasis.  I like my vocals crisp, so stay away from Josh Tillman’s voice you nasty upper midbass hump.  I hear soundstage better than just about anything I identify in music, but my words haven’t caught up to my ears. I listen at volume levels that others consider loud (75 - 80 dB), but I just set it to where the dynamics peak. I’m not here to shatter my eardrums. I like them just how they are.
I generally don’t believe in using EQ, not even for inexpensive headphones, especially in reviews. I won’t claim that I haven’t done it, but I generally try to avoid it.
I’m a firm believer that cables can make a difference, but I don’t think they always do. When I tried out Toxic Cables line, none of them had labels and the cheapest looking one was the one I liked the best. I was excited that I wouldn’t have to spend much to improve my sound. It turned out that the cheapest looking one was the Silver/Gold top of the line cable. I’ve heard the difference that USB cables can make, from upgrading from the crappy cable that came with my Geek Out 1000 to a Supra USB, and then again when upgrading to the LH Labs Lightspeed 2G with the iUSB3.0. When I picked up a cheap shielded power lead from Mains Cables R Us (who also sell iFi gear) to replace my standard kettle lead on my amplifier, I heard more crunchy and clearer treble. I switched the leads with my wife blinded and she heard the same difference. I didn’t tell her what I heard and let her describe it herself. But cables don’t always make a difference. When I switched from my standard HD650 cable to a custom balanced cable (Custom Cans UK, very affordable), the sound stayed exactly the same when hooked up via a top tier (custom made by @dill3000 silver/gold) 4-pin XLR to 6.3mm converter. Balanced mode made a difference in clarity and blackness of background. Your mileage may vary and you may not hear a difference, but I have.


Vital Statistics (specs from manufacturers and distributors)

In this section of my reviews I try to let the manufacturer’s story about their product be told. Manufacturers and retailers always have something to say about their products, some of the time it’s accurate. The review sections will tell whether that is the case here.
This is what Gearbest had to say:
D900S wireless earbuds adopts the exclusive Multiplex Link composite connection technology of Syllable for absolutely wireless connection. Without limit of cable, just enjoy the music freely while doing sports.

Main Features:
Syllable D900S Bluetooth wireless earbuds for music and calls
The updated version of D900, provides more stable signal and longer standby time
Supports apt-x sound effect, offer the Hi-Fi tone quality
IPX4 waterproof, impervious to sweat and rain
Come with intelligent charging box for continuous use
Compact size, easy to carry

Not really a whole load of bull there. I appreciate a straight to the facts statement about what the product does. That means I don’t have any fabulous claims to repudiate, which removes a little of the fun of conscientious reviewing—also known as being a disillusioned skeptic.
For those who find themselves dying to try this at this point or after this review, Gearbest have provided a coupon code for your convenience. Get $40 off with the code LHSY.
8mm dynamic
Frequency response
20Hz - 20kHz
Bluetooth 4.0: A2DP, Apt-X, AVRCP, HFP, HSP
Bluetooth Range
10m without obstacles
Sensitivity: -42db±3db
Talk time
4 hours
Music time
4 hours
Standby time
90 hours
Charging time
2 hours
Micro-usb for charging
Intelligent charging case, micro-usb cable
Battery capacity
65 mAh
Music controls
No music controls

Form & Function

The packaging was functional with a sexy man bun model on the front. My wife commented that the man-bun is really in right now, she’s seeing it everywhere. Apparently Asia’s love of foreign looking models extends to Swiss-looking dudes with stubble beards and man-buns. The picture on the box is real, at least. Online there are obviously photoshopped pictures with athletic people in tight fitting athletic gear smiling with their luminescent bright bleached pearl chompers.
Obviously photoshopped HeadFi product descriptor pictures
Real box pictures
In addition to the IEMs, inside the box you get a micro USB cable, a silicone lanyard for connecting the earbuds, a cloth bag for carting ‘em off to the gym—go to the GYM commandeth the D900S, and the charging case. The specs don’t tell you how long the charging case takes to charge, but it seemed longer than two hours for me. The headphones gave less than 4 hours of playtime for me. I would guess this was due to the weakness of the signal. It’s like what happens when you take your phone into a low reception area: the constant searching for signal drains the battery. Bluetooth pairing isn’t terribly difficult. First pair the right earphone using standard hold the button till you get some rapid flashing methodology, then press the same button on the left earphone by holding it till you hear sound. All this pairing only takes a few seconds. I’ve tried pairing these with 6 transmitter/DAC combinations, some with aptX and some without, here are the results:
  • GO V2 with Avantree BTTC-200 (not aptX, Bluetooth 2.1, but was my best sounding Bluetooth transmitter on previous pairings): it’s plagued with dropouts of the left channel. I think the latency may be too high for the processing capability on the Bluetooth receiver and transmitter in the right earphone.
  • Dell Vostro laptop (not aptX): dropouts were less frequent, sound a bit thin.
  • GO V2 with Avantree BTTC-200 (not aptX, Bluetooth 2.1): unlistenable, inconsistent signal with dropouts with any movement of the head. Sound lacked body, sounding like a crushed tin box and not in a good Radiohead kind of way.
  • GO V2 with Aukey BTTC transmitter (aptX low latency): connection strength varies greatly, one day whilst listening to Adele on Tidal I had good sound and infrequent dropouts, another day whilst listening to Bandcamp it was constantly dropping out and near unlistenable
  • Samsung Galaxy Note 2 (not aptX, Bluetooth 3.0, haven’t previously liked how it sounds in Bluetooth): constant connection dropouts, unlistenable
  • Samsung Galaxy Note 2 with Aukey BTTC (aptX low latency): constant connection dropouts, unlistenable
There is an interesting article by LJokerL up on his blog “the headphone list.” I think I would put this article in required reading for anyone considering getting a Bluetooth headphone. The following sentences provide a summary. A2DP is the profile that is used to play music. Without aptX, the maximum quality will be similar to a 320kbps mp3 using the SBC codec that is included in all Bluetooth devices. There are also headset and hands-free profiles, but these default to low quality mono. After Bluetooth 2.1, audio quality on SBC is exactly the same, so some older transmitters and receivers may sound better than newer ones, it is all down to SBC implementation. This is why my Avantree Bluetooth device usually sounds better than my Aukey even when the Aukey is using aptX and the Avantree is using SBC. AptX streams in near CD quality sound, and has versions that improve latency, which can lead to better lipsyncing in movie and game functions.
I found that the better the amplification my source had, the less chance of dropouts I had. The GO V2 consistently had the most stable stream, and also had the highest power headphone out. The worst connection I had was with my Galaxy Note 2 (with or without aptX dongle) which has a weak headphone out, and generally poor Bluetooth performance. When I took the Note 2 out for a walk with the Syllable D900S, it was unlistenable. I had constant signal dropouts, especially on the left earphone. The signal was so poor the wind blowing in anything more than the gentlest of breezes was causing dropouts. After 15 minutes of this on two separate walks running errands for my daughter’s 1st birthday party I gave up and put the headphones back in my bag. The sound of the high street traffic was more pleasant than the constant cut-outs I was getting. When I switched to using the aptX dongle from the Note 2 headphone out on my second walk, there was no improvement.
The Syllable D900S only comes with two sets of floppy weird shaped silicone triple flange tips. The nozzle on the headphones is oval, but I found that using other tips did work, so make sure you have some other tips on hand that fit your ears well. I couldn’t get a perfect fit for the gym-rat purpose of these headphones with the stock tips. The smaller set of tips don’t give me a good seal, so the sound is thin, with hollowed out mids and a lack of impact, but I can jump up and down and shake my head from side to side pretending that I’m in Flashdance—What a FEELING! When I switch over to the bigger tips, the seal improves, but the fit is less secure. If I move full on Footloose, my left earbud will be flying out this joint. No Kenny Loggins for me. Everyone will have different shaped ear canals, but given the limited number of options on these, fit may be a problem for many users. If you just want to take these for a walk, you may be fine, given a very good Bluetooth source, but going for a vigorous up and downhill run, or playing a game of tennis and you’ll be picking up the plastic shells off the ground in no time. I think lateral movement will be more of a problem with the stock tips.
Speaking of those shells, they are ginormous! They are very light, but because of their size simple leverage makes the tips prone to loosening in my ears—this ascribes to the fit issues I’ve been experiencing. The size of the IEMs is understandable, as within the right shell there has to be a battery a Bluetooth receiver, a Bluetooth transmitter, and some form of signal amplification, which is one more component than most Bluetooth headphones require in that they use a cable to connect the individual earphones. Many Bluetooth in-ear headphones are large, but these are larger than large. They are robotic suits in a boy band music video large. They are Bill Murray with an elephant buddy large.
Laser Time Podcast​
Google Images​
The Syllable D900S is at the bottom,
The 1MORE EO323 [size=inherit]is [/size][size=inherit]at the top. [/size]
[size=inherit]In between is the quite large 64 Audio X2[/size]
[size=inherit]The Syllable clearly dwarfs the competition.[/size]
[size=inherit]As can be seen below, the Syllable is comically[/size]
[size=inherit]large in ear also.[/size]
One thing that is sadly lacking on these is volume controls. Not all tracks are at the same volume, and if you are running on a treadmill you really don’t want to have to change settings on your phone or Bluetooth enabled DAP. Depending on where you have your audio player, this might not even be possible. I'm not convinced of the benefits of completely doing away with wires, if you do away with all the advantages they present.
I would say that the 10m range listed on these is an utter fabrication or just a repetition of what CSR says on their chip specification. I had problems with drop-outs at less than 1 metre away from my source, walking a five meters away with the door open from my office gave me consistent drop-outs. The 10m range is likely ideal and not real world performance.
Overall, the headphone gives the impression of a headphone that had some testing in ideal circumstances, and insufficient beta testing out on the street. How can a sports headphone be unable to take movement or a gust of wind without drop-outs with the included tips?
After reading @B9Scramblers's review, I tried using different tips. I took the tips off of the 1MORE EO323 and to my surprise they fit fine, and the oval nozzle wasn't a problem. In fact, different tips appeared to increase stability of the headphone. Version three of these needs to use standard tips and a more ear shaped earpiece, as @B9Scrambler says in his review. I think that these headphones are incredibly sensitive to movement of the headphone. If the headphone shakes around much, like when they weren't very secure outside in the wind, they drop signal. When the headphone is secure, it doesn't vibrate much in the ear, and is less likely to drop. Better fit improves the sound a little bit too, the mids are more present, but the signature is still lacking in detail. Watch out when you remove them from your ears, though, as using non-stock tips, the tip is more likely to come off. I found that the 1MORE tips loosened and pulled to the end of the nozzle. In the next version of this, the nozzle needs to be round to allow easier use of tips.
An improvement that I would make to the design is to distribute some of the internal machinery into a pair of built-in ear-hooks. Move the Bluetooth receiver for each headphone into a robust earhook. The wires of the earhook could have data transmission functions as well as form functions. This would reduce the bulk of the IEM that is in the ear, and would enhance stability. These changes would change how the charging port would need to be arranged and force redesign of the charging case. I think the benefits would outweigh the costs, though. Another option would be to just shrink the shell. I think some of the size is to make manufacturing easier. I'd rather have a little bit harder manufacturing and a lot more stable product.

Audio quality

The audio quality is hard to define. It ranges from pretty good to bag of dead cats. I would think that a bag of dead cats would be considered universally bad. The problem is that I can’t keep a constant enough signal in most usage to get to hear the sound well.
When I have strong signal, the sound is a bit thin in the mids, and lacking emphasis in the bass. There are rare bits of treble harshness on some sharper violins, but it is minor. In general, these sound pretty balanced, but they probably would have benefitted from better amplification at the IEM. Overall, these sound good, with an average soundstage and fairly neutral presentation. Many folks will want more bass for a sport IEM, so the tuning might not fit the market these are aiming for. As I had difficulty establishing signal much of the time, I didn’t give these as much listening time as I do for most of my reviews.
When compared to the Ausdom M05, these are worse in every way. The Ausdom sounds engaging and full-bodied. The Syllable D900S is thin. The Ausdom fits me comfortably, the Syllable is hard to get a secure fit with stock tips and inflexible. The Ausdom has excellent Bluetooth range and had no problems with dropouts on the same transmitters. Sound out of the Ausdom sounds CD quality, sound out of the Syllable does not. The Ausdom M05 are very lively with a 3-dimensional soundstage, more bass, and more treble. I prefer the sound of the Ausdom M05 and it has rock solid Bluetooth performance, and controls on the headphone. If choosing between the two, I’d buy the M05 every time. The M05 is also more stable on the head, so you might actually be able to go for a run with it. In fact, I know a reviewer who did.



If the signal and fit issues weren’t so terrible for me, I would still be a bit torn on recommending these on sound quality. They have a mostly neutral presentation. Mids sound a bit thin, and bass and drums could use a more impact, but for $50 with the coupon code LHSY on Gearbest, these would be considered, if the signal wasn’t terrible. These are a decent sounding Bluetooth in-ear.
However, I struggled to get a good signal on these headphones, and the shells are so huge that they had to design custom tips that only come in two sizes and will likely not fit many people. I had trouble keeping these stable in ear and constantly felt like they were going to come out. My ear canal size is likely in between the two tip sizes provided, as I didn’t get enough bass and the mids sounded hollowed out with the small tips, but the headphones weren’t secure with the larger tips. I’m not going to be alone on this.
Overall, I found these very disappointing, which is why I’ve given them such a low rating. Most of the time I rate about 70% sound and 30% everything else, but in the case of these the everything else was bad enough that I couldn’t enjoy the audio quality from these. This problem has made the rating flip for me. I feel like I might be rating a bit generous at 2 stars. Other folks may not have the fit or signal issues that I did. I imagine that it will vary by your ear canal size and by the capabilities of your Bluetooth transmitter, but I will say this is the first time that I’ve experienced problems with my transmitters in 4 reviews of Bluetooth headphones. Maybe your fruit laden or confectionary themed cellular device will have better luck than my dongles and DAPs, but I wouldn’t bet heavily on that outcome.
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Reactions: B9Scrambler
I don't even know if I can review my pair. I can't get a fit with the stock ear tips. When I try aftermarket tips they cause so much driver flex that the sound will be muted and muffled until I am able to equalize the pressure on the Driver. I had a hell of a time getting them to connect to my LG V10 phone. For some reason the phone wouldn't recognize them. When it finally did, the sound kept doing this weird cutting out/clipping thing (really annoying). I love the concept of these but there's very little in terms of nice things I can say about them. 
When I wear them it looks like I stuffed black decorative eggs in my ears. They would make a cool gift for someone who is a tech geek and could care less about sound.
@Hifisound Glad I'm not the only one with driver flex issue. They do stick out :p Hence the Cyberman title, haha. Neat product. Needs some work.


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