ES100 MK2-24bit Portable High-Resolution Bluetooth Receiver/USB DAC/Headphone Amp with LDAC, aptX HD, aptX, AAC (3.5mm Unbalanced & 2.5mm Balanced Output)

Updates on the Bottom I just wanted to add a quick review for now because I think this little device is fantastic and it’s a shame that more people don’t know about it. I will give it 5 stars for my first impression but will continue to update this review as I spend more time testing it. I have been looking for a Bluetooth solution like this for a while now and I had never heard of this company or this product before. Even after finding it on Amazon and seeing the impressive spec sheet, I was very skeptical that it was legitimate. What finally convinced me to give it a try was finding forums on it and seeing people’s experiences with it as well as seeing a strong presence from the company in the form of a representative from the company thoroughly answering questions. Although I’ve seen many pictures and the promotional video about this I wasn’t prepared for how small and lightweight this would be. The device looks very nice and has a simple but functional layout. One button to power on, power off, put into pairing, play, and pause. It also has a volume rocker and a back/next track rocker that is also used to turn on ambient mode. It was very easy to connect to my iPhone and get it up and running straight out of the box in a minute. I don’t want to get too much into sound, battery life, or the app because I haven’t had enough time to test any of them very much. I will say that it does sound great using the 3.5mm jack and AAC codec and I threw a wide variety of music at it. Previously the V-Moda Bluetooth was some of the best I’ve ever heard but I would say so far that this is noticeably better for me. The unit had 75% battery and while I haven’t tested to see if any firmware updates fix a battery issue, the app seems to show the battery life while the battery notification on my iPhone always shows 100%. I used it for an hour on 3.5mm high performance and it took me to 70%. I don’t think this is any real indication of battery life but will try to test it going forward in an update to this review. The app so far is fully featured and I added pictures of the app in this review. With only limited time in the app I will say that I really like the equalizer and the fact that it has a healthy amount of presets as well as what looks like customizable and savable presets but I will test this out more soon. I also briefly tried out the ambient mode and thought it was a very neat feature with a surprising amount of features. I don’t know how much I would personally use it but enjoyed playing with it and found the implementation well done. So far I have only tried it on two of my many headphones but it was a pretty wide range with the IE80S and the HD800S. While I expected it to drive the IE80S without a problem I didn’t expect it to drive the HD800S so well. To think I got that sound quality out of Bluetooth from my iPhone is just amazing and I do see a lot of potential to use my headphones with the ES100. It is a little too early to give any recommendation other than people should take notice of this little device because so far it is very impressive. I will continue to test the ES100 and update my review after a lot more use but if it holds up, I can definitely say it will be a deal at $100. [UPDATE] I’ve still only used this for a couple of days but I am very impressed with the sound this puts out. I’m using the balanced output now and it is hard to believe that this is Bluetooth. I’ve also tried to test the battery and although the battery indicator seems to be buggy, if it is anywhere near accurate the 14 hour estimation of battery life could be very accurate and that is with EQ on, volume at 50%, and using the 2.5 balanced output. [UPDATE 2} There has been a firmware update that seems to have addressed the battery life indicator issue. The ES100 has been working amazingly and it is still impressive how good the quality of the audio is. If I had to change anything about the ES100 it would be with the placement and style of the controls. They do work well but they could be a little better and easier to locate and press without looking. Overall this is a great device and is a must have for people looking for something like this.

Tldr? Buy it! Seriously... I had/have the Hidizs Sonata HD II USB DAC, but it kept detaching in my pocket. and it made the phone unwieldy to use, as I had the DAC connecting to my Little Bear B4-X tube amp, and the phones connected to that. Now I have the phones connecting to the tube, but the tube connects to the E100Mk2, (Mk2) which connects via the Bluetooth LDAC codec to my Phone. OnePlus 7t running Android 10. On which I run USB Audio Player Pro (UAPP) which I have route audio to Bluetooth, which allegedly makes the signal cleaner before being sent to the Bluetooth receiver. I'm running in BitPerfect mode. Set Android volume to full to use the Analogue volume of the MK2 On ease of use alone, this is a winner, I can use my phone as normal. It has a phone pass through with a mic built into the Mk2, you can speak and be heard with the MK2 in your pocket. Functionally, it has twin DAC's and balanced output via 2.5" it drives the Tin HiFi P1 (Planar Magnetic) easily, and that is difficult to drive. I'm currently running 3.5" SE but some balanced 2.5" cables have just arrived from China. It also has a great full featured app. Allows you to tweak the roll off of the DAC live with music playing. So you can switch until you find one you like. It has a full EQ, (might be fixed parametric, not sure, not used it.) The battery charges fast by Mini USB. Lasts about two days of medium use. There is a little icon on the Android notification bar, that turns read when it needs to be charged at about 15-20% The button layout is good, with volume under the 3.5" output and power/action FF & RW under the 2.5" output. USB is on the bottom. Bluetooth wise it functions well with my Withings Steel Series HR smartwatch which is also always connected. Supports gapless playback, etc. It also integrates as a default headphone out, so it works with other Apps like Amazon Music HD, etc. All that aside, where it really shines is in how it renders music. With my Hidizs USB DAC, (which was an upgrade over my old Dragonfly Black, now plugged into my PC) the Mk2 renders a large sound stage with excellent imaging. The Tin HiFi P1 was a very intimate experience via USB, and required a good 85-95% volume to sound good. The Mk2, is night and day. So much so that the P! is now my daily driver instead of being carried in case I wanted to listen to Adelle's "21" It pretty much excels at anything else you plug into it, I've tried the Tin T4, the QKZ VK4, the Shuoer Tape (electrostatic) the BLON bl03, the VIE Bonus earbuds and the ikko OH10 all of them sound better than they did on the Hidizs USB DAC. However it's the P1 that has changed the most. I really love what it does in the way of detail retrieval and vocal reproduction. I simply hear things with the P1 I don't hear with anything else. A minor note about the Little Bear Tube amp. Essentially the tubes are microphonic. This means that they will pick up local radio broadcasts, ( by local I mean "hyper local." GSM and Bluetooth in your pocket. etc.) You can get past some of this by keeping you phone in a different pocket.and getting a longer interconnect, from the Mk2 to the tube. Otherwise you get a constant low level intermittent tone during silence. It doesn't affect music, since any music drowns it out. However if you tube it, that's what you have to put up with. Why tube? It make the sound warmer, wider with more "air". If you're using a tube, just make sure Android and the Mk2 volumes are at max, then use the tube as the final volume control. This allows you to drive pretty much anything. With balanced, (the Little Bear is a balanced tube) giving you even more power if you need it. As you can no doubt tell, I'm really impressed with the Mk2. It's a truly fantastic bit of kit. Well worth the asking price, and if you're using a USB DAC, or you just want to make your phones Bluetooth enabled then this is the device to buy. Seriously good.

Would rate 6-Stars if I could. If you're here because you REALLY love your wired headphones and don't want any of the current BT garbage, you're not alone and you've found your solution. If you want to get right to the advice, buy this BT-DAC right now and start enjoying full, beautiful sound, no artifacts, and a truly usable GEq and DSP. If you want more of the review, read on: First, I'm a...erm..."intermediate" audiophile. I'd never pay $100k for a pair of speakers nor $1k for interconnects, but my listening system is expensive and high-resolution and I know what that sounds like. In the past, I've used Shure IEMs exclusively. Apple decided to turn off ("it's a hardware issue" - is the BS line to get me to "upgrade") audio transmission to my lightning port, so I've been hunting for something satisfying for the better part of 6 months. I have AirPods - they're utter garbage if you like hearing the music you're playing. I have Bose 35s and they're passable, especially in the isolation department on aircraft or noisy locations, but the low and punchy-bass extension is anemic and if pushed, they distort (more on one ear cup, making it intensely annoying). The Bose 35s also lose effectiveness the moment you wear a baseball cap, sunglasses, or eyeglasses (an issue that IEMs don't summer in any way), they're clunky, and they're decidedly not sweat or water-resistant. Enter the EarStudio ES-100 to literally put my world back to normal. THE BAD: Me, personally: I can't find any major detractors currently - it's flawless so far as I can tell. The build materials might not be the very best, but it's $99, so I wasn't expecting aircraft aluminum. Others: The BT calling is not the best, but this thing isn't designed for that - it's for music and it's completely usable and clear - just some little artifacts on certain calls. THE GOOD: [Everything] Sound Quality = Excellent. It's probably not the most transparent device available, but it is damn good, rivaling my DragonFly Red with far more to offer in terms of control (see below) Power = Excellent. The amplifier(s) are powerful and offer punch that the iPhone simply doesn't have. DSP = Amazing. Companion App = Amazing. Control = Amazing. There's control over nearly everything, with clear explanations below the controls as to how they work and why. GEq = Amazing. The GEq allows you to save [at least 4] preset curves to match your different headphones or different musical genres. It's artifact-free so far as I can tell, and I've not gotten any clipping at all. This is HUGE, as different headsets have different sound signatures, even from the same manufacturer, and this is a one-touch solution to those differences, once configured (which is very easy). Bonus 1: The biggest issue with the iPhone is that you cannot apply an equalizer curve across all of your music services - it works for Apple Music, but not, for example, Pandora. The EarStudio's GEq completely fixes this issue, applying your chosen curve(s) across all outputs. Truly amazing the difference it makes. Bonus 2: The one detractor to IEMs and closed-back circumaurals (big "can" headphones) is that the isolation from the outside sounds might not be ideal due to safety reasons (work environment or driving in a car) or concern for children (whose voices you might need to hear). The DSP engine allows you to pull as much or as little ambient sound and integrate it to your sound stream! What does this mean? It means you can enjoy all of the isolation features of IEMs or closed-back headphones whenever you want but then make it so traffic noise, kids, or other environmental sounds come through - only when you want and only to the extent you want. Even better? There's a hot-button for this, allowing you to turn it on and off instantly. Imagine this: You're on an airplane enjoying music without engine whine. Someone taps you to talk, but your isolation is so good, you can't hear them. With the hot button (both a physical one on the body of the EarStudio and a virtual on on the companion app), you can instantly mix in the outside sound (one-touch) to hear it and then re-isolate again with another touch. You need not have less-isolating headphones or IEMs in order to safely or effectively (or selectively) hear outside sounds. Even on my Bose 35s you have to tap the isolation button twice to get this. In short, the sound is awesome, the controls amazing, and the thinking about usability and functionality are amazing. I thought I was going to get a bunch of chopped up Chinglish and a passable device, but...man, they got it so right. Bravo to the people at Radsone - this is one of the very best audio products I own.

I will first say that I was suspicious of this item because the many gushing reviews seemed to describe the impossible: a near high-fidelity experience over Bluetooth. Still, I was looking for a solution to the problems I had due to a poor OEM DAC and lack of Bluetooth media in my car, which has a reasonably good amp and high-end after-market speakers. I was even more suspicious because of the "F" grade the product reviews received on a popular and generally pretty reliable website that assists in spotting fake Amazon reviews. It came up as a daily deal for twenty bucks off, so I went ahead and bought it anyway because I was out of options with my car stereo The short version is that the reviews are not fake. It really does sound fantastic -- way beyond my expectation. In terms of performance, this has completely changed my listening in the car and saved me the expense and bother of trying to upgrade (or purchase a different car, as I was close to doing). Part of the magic for this is the options for AptX and for LDAC. The short explanation is that these two options allow for much, much better fidelity over Bluetooth than with past standards. My Galaxy S8 is capable of transmitting both, so I am able to take advantage of it, so check and see if your phone is capable. The DAC on this seemingly impossibly small piece of gear is a marvel to hear. No exaggeration -- it's just fantastic. (I would most certainly be happy using it on my hi-fi in the house, but I don't have a need for it there). The accompanying app that you download adds very useful options to equalize the sound and make adjustments to the DAC that are probably way beyond the interest of the average user, but are of interest to me. I have it set to come on automatically when the USG outlet it's plugged into in my center console comes on, which is a simple but great idea. That is, you don't need to turn it on or off each time you use it because it powers on only when the car is on. Connections to my phone is automatic. From there, I usually play through the Spotify app with downloads at the highest possible quality. I also have used it for playing my classical FLAC files (through LDAC), including 24 bit files. LDAC is a very clever bit of code, and I like having the album art, etc. Performance is very good, although I generally find the CD a better option in terms of dynamic range and soundstage. Still, if you are looking for this as a way to play FLAC files, you will be pleased. It simply is capable of dynamic range and fidelity I never thought possible through Bluetooth, coming very to what you would get from CD or if your system has the ability to play FLAC natively. The fact that you can adjust the sound through the app might make it a better option for you in fact. Just up to taste, really. Now the not-so-great and why I cannot give it five stars. I hesitated to even give it the "4.5" in the headline of this review. Mine came with an older and apparently inferior, early version of the firmware. I was eager to update based on what I read. The process for updating the firmware is atrocious and nearly had me packing it up to send back. You will be required to download a zip package of instruction and executable files. The instructions gloss over many important but minor details that I guess they assume you know. The English version of the instructions lacks the necessary precision in description of steps to do this by simply following the instructions, requiring a certain level of experience on running command through a command line prompt. I tried on both Windows and Mac and could never get the Windows file to run. I switch to Mac and finally got it to run correctly after a few tries. (If you've never used "Terminal" program on your Mac, read up a bit ahead of time for general instructions.) The problem wasn't entirely due to the clumsy software interface, but the fact that you have to place the device itself in a certain state by holding a combination of buttons to run the update on it. The instructions do not offer a clear enough description of the combination of sequences of green, red, and blue led flashes to really understand what state it's in. I ended up doing a factory reset several times (both intentionally and accidentally) before I stumbled on the right way to do it. I still cannot tell you what that combination of steps were. The accompanying app is now prompting for another update of the firmware, which I would like to have, but can't get myself to a state of mind to try. My message to EarStudio is that you need to get this fixed. There's no reason to make this so difficult and cumbersome. Why can't we update through the app or through a piece of software for your computer? I understand that this is a product that just came to market, but it requires updates just to get it to perform optimally, so you're doing your brand and your customers a real disservice by putting this down the priority list. It should have been done prior to it market. I assume an easier update will someday be an option, but I don't actually know. Your milage may vary, but I'm a reasonably experienced computer operator, so it's not just me. OK, that's my rant on the firmware update process. What I want to leave you with is that this little item (once up and running) performs far beyond my expectations and is a real gem. It's just amazing sounding and has completely reinvigorated my music listening while in the car. Hope this is helpful.

As all of the other reviewers have noted, this is an exceptional product, and very reasonably priced. I highly recommend the ES100 for anyone who loves audio and has expensive wired headsets, or in-ear-monitors, and especially for owners of the IE800. For anyone who owns the Sennheiser IE800 or IE800-S, I wanted to encourage you to enjoy this product making use of the Sennheiser "Y" connector feature. IE800: For the Sennheiser IE800, this is very direct, since the IE800 wires the 3 pole 2.5mm TRS connector in standard audio connections. I use a short, 6 inch 3-Pole 3.5mm Male to 2.5mm Female Headset Audio Adapter Cable Extender to connect to the EarStudio ES100. Amazon sells several of these. This replaces the long kevlar Sennheiser cable with the short 6" cable. This produces a comfortable cable length that is easy to manage the ES100 controls, while easily fitting the ES100 into a shirt pocket or clipping it to the collar of your shirt for good access to the microphone if you use the call features of the ES100. IE800S: For long cables, the IE800S works great with the ES100 using the Sennheiser cables with no changes. So, you can use the Sennheiser supplied 1 meter long 2.5mm connector balanced cable directly into the ES100, or the Sennheiser supplied 1 meter long 3.5 mm connector unbalanced cable because inside the Sennheiser extension cables, Sennheiser re-orders the wires on the plug to match the required ES100 configuration for either the balanced 2.5mm socket, or the unbalanced 3.5mm socket. If you want to use a short cable with the IE800S with the ES100, the situation is a bit more difficult. The wiring on the IE800S "Y" connector is different than the ES100 requires, which wouldn't hurt the ES100, but would switch left and right and make the right 180 degrees out of phase with the left signal. You would certainly notice the Left/Right swap. ES100 shows that the plug wiring from the tip forward should be Tip -> R-, Ring1 -> R+, Ring2->L+, Sleeve-> L-) (R-, R+, L+,L- ) (ES100 Manual or App Diagram) whereas the IE800S "Y" connector is (L+,L-,R+,R- ). (IE800S Manual) If you want to use the IE800S with the ES100 with just a short cable, then ... There are short 2.5mm balanced (4 pole) to 3.5 mm unbalanced (3 pole) adapter cables on amazon, and these would be safe, but again it would be best to check the actual wiring to be sure the L and R are not swapped or phase inverted with each other in the cable adapter. Ideally the wiring for the 4 pole socket receiving the Sennheiser Y connector 2.5 mm plug to the 3 pole adapter would be: 3.5mm tip -> Sennheiser Y socket receiving tip, 3.5mm Ring -> Sennheiser Ring 2, 3.5mm sleeve ->(Sennheiser Ring 1 and Sleeve) Probably the most fun to own would be a short, 6", balanced cable, which replicates the Sennheiser wiring crossover in their 1 meter cable. This would be easy to make on your own with a soldering iron, a 2.5mm 4 pole socket, a 2.5mm 4 pole plug, and some light wire. (L+,L-,R+,R-) connects inside a crosswired cable to create (R-, R+, L+,L- ) If we name the 2.5mm female socket (S) pins: receiving TipS, RingS1, RingS2, SleeveS .. and the 2.5mm plug (P) pins: TipP, RingP1, RingP2, SleeveP then we would wire the cable... 2.5mm female to male plug crosswire (L+,L-,R+,R-) connects inside a crosswired cable to create (R-, R+, L+,L- ) RingS1--SleeveP, TipS-- RingP2, RingS2--RingP1, sleeveS--TipP Or you can have an outside company make one for you (such as customcans). There are electrical noise benefits for balanced operation, especially for long cables, and there are theoretical benefits from cancelling even harmonic distortion, but I have to admit that for a 6" cable, you are not likely to notice any benefits. However, if you are making your own cable, it's more fun to make a balanced cable which has the best possible results (even if not all of those results are necessarily noticeable from an audio perspective).

I was surfing Head-Fi.org forums to see if there were any aptx HD Bluetooth receivers making news. I nearly picked another brand.. but was steered to the Radsone ES100 unit by an industry pro. For less coin, the ES100 delivers better specs, including 2 independent DACs, a dedicated app with 10-band EQ, and a boatload of technology. Spend a few minutes on their website, read the white papers. Specs look great on paper; so how does the unit perform? Let’s just say I was blown away at the clarity and power this unit offers. I tested with IEMs, on ear, and over ear headphones. ALL were sufficiently powered and sounded incredible. I’m talking sound rivaling that of my Hi-Res 24-bit sound card and tube style headphone amp. Plus, the latest Bluetooth codecs and aptX HD which my LG V30 supports. Plenty of power and an insane level of sound customization available through the EarStudio app. It’s true folks, this little gem will power your IEMs and over ear units with ease. For those wanting good sound AND power, the EarStudio app is for you. Upon initial pairing, you select the output. I’d say most will be using the 3.5mm output. After selecting, you’re presented a normal mode, and a high performance mode (2x current output). This screen is not pictured in the manual so I wanted to highlight (see pics). That high performance mode kicks butt! Want more crystal clear power? Crank up the Analog Volume on the Home screen, and the Preamp slider on the EQ screen. Both affect gain and add serious punch which can then be tuned using the 10-band EQ. I tuned and saved a preset for my IEMs, on ear, and over ear. The 3.5 jack and Quad DAC on my LG V30 made it hard for me to justify spending money on this thing. Trust me, it was worth it. The ES100 is small, light, and powerful. I do most house activities wearing only boxer shorts. 😊 I can clip this thing onto my boxers and keep moving! The gym, the yard, all the possibilities, with crystal clear, powerful sound. I’m sold..

My earlier review still reflects my feelings on the ES100's sound and convenience: the sound is phenomenal for a portable DAC/Amp (with a chip more often seen in ~$3k desktop DACs), and it's tiny, lightweight, and easy to use. The only problem is, after about six months, I'm again having the same problem I had with my previous device, where it will restart seemingly at random. On good days this only happens once or twice, but I've had it happen multiple times in 15 minutes. I'm the kind of person who listens to music more or less constantly and does *not* appreciate having songs interrupted, so that issue alone is kind of a dealbreaker—as I'd imagine it would be for much of the ES100's target audience. I have done a factory reset a couple of times and upgraded the firmware, but the problem has persisted. I haven't tried to do anything clever with it, and while I have used my current ES100 daily for the past six months, I've only ever run it in the recommended mode for my headphones, which is 2x current mode locked to the 3.5mm jack in order to avoid damage if the cable gets unplugged accidentally. Overall, this issue has been a huge bummer for me, as I really do love this little thing; it's been my constant companion for a year now and has rarely left my pocket. I will say, though, that I'm glad that others with this problem have mentioned it here as well, as hopefully that might help RADSONE improve their product. On that note, if you're reading this at RADSONE, I would be more than happy to ship both my old and current unit to you if that would help debug whatever issue it's having. For now, I've switched to using a slightly inferior product from another manufacturer, but if and when RADSONE definitively fixes this problem, I will gladly buy a new ES100. ----- Previous review: I bought my ES100 about six months ago, and it has quickly become indispensable as my main audio device; the USB support means that I can plug it into my laptop and seamlessly transition from phone audio to laptop audio, and the sound is noticeably better than either the default Pixel 2 USB-C dongle or even the fairly decent DAC in my Macbook. The unit itself is super compact and the buttons are small as a result, but the controls are intuitive and easy to use, and the buttons have "rollover protection," which means that accidentally hitting multiple buttons at once won't cause annoying or weird behavior. The mobile app is also fantastic, though YMMV as the options it has are definitely geared toward audio nerds; most people probably won't need to bother with most of them. I started experiencing issues with mine recently, but I contacted Radsone support, and after the usual back and forth to make sure it wasn't something software-related (factory reset, firmware update, etc.), they gave me a code for a replacement unit. Overall a great support experience.

Here's the short version - if you spent good money to get a good set of in-ear monitors and want to use Bluetooth, buy the ES100 and a set of balanced cables. First off, to be fair, Bluetooth audio was never supposed to be a high-resolution audio interface connection. It works well enough for most people that it just doesn't matter most of the time. That being said, I'm a bit spoiled by a home audio setup that's pretty much a recording studio without the actual act of recording anything. My everyday listening earphones are a pair of Shure SE315 with either the bundled hardwired cord into (cringe) my Phone, a Pixel XL that's been recently retired, or using the (double-cringe) the Shure BT1 cable for wireless convenience. The SE315's notorious for sounding very mid-heavy and, with those two connections, that's never been more true. No mass-market phone can drive headphones with the power they need to sound their best and the BT1 Bluetooth cable doesn't support anything beyond the basic AVRCP/A2DP profiles. That means no AptX, AAC, or LDAC. They don't sound BAD like this, particularly when I'm doing anything remotely active like mowing the lawn or out for a hike/walk. But they don't sound nearly as good as I know they can be with a proper headphone amp driving them. Enter the EarStudio ES100. It's a tiny little wonder that really opened up the audio capabilities of my earphones. It's not a full-fledged audiophile solution but they get more out of the SE315s than any on-board and non-HD Bluetooth audio solution I've tried thus far. Physically, the unit is about 1 inch wide, 2 inches tall, and about half an inch thick. It's got a pair of outputs depending on how you want to connect your earphones - one is the standard 3.5mm headphone jack everyone is familiar with already. The other is a 2.5mm *balanced* output for a better output signal. There's also a microUSB port on the bottom of the unit so it can charge and/or connect to a computer for use as a straight-up DAC. It'll show up as a new sound device on both Mac and Windows computers. I wound up getting the ES100 with a set of balanced MMCX cables for my SE315s and it made a HUGE difference in sound quality. While the audio is still quite mid-heavy, the lows and highs are coming through more clearly, even over Bluetooth (LDAC profile). And this is before I even get into the EarStudio app to tweak things with the equalizer and other settings. Similarly, the AAC profile from iOS devices makes audio more enjoyable. Audio from a PC/Mac with the USB connection is similarly improved over most on-board sound solutions but I haven't spent a lot of time testing this as the ES100 is intended for my everyday (read: portable) listening needs.

Das wichtigste zuerst. Der Sound ist top. Ich konnte mit einem HifiMan Edition XS keinen Unterschied in der Klangqualität zwischen direkten USB-C Anschluss über einen Standard DAC sowie ebenfalls Earstudio 100 im Vergleich mit Bluetooth Übertragung durch Earstudio von einem IpadAir 4 feststellen. Einziger Unterschied ist die maximal erreichbare Lautstärke. Die ist mit dem EarStudio ausreichend hoch. Beim direkten Anschluss über einen einfachen USB-DAC ist die maximale Lautstärke mit dem HifiMan doch etwas eingeschränkt, was auch zu vermindertem Druck im Tieftonbereich führt. Darüber hinaus ist die App sehr gurt gemacht und intutiv zu bedienen. Der dort einstellbare Equalizer ist brauchbar und lässt sich auf gut die eigenen Bedürfnisse einstellen. Die Akkulaufzeit des Geräts ist gut, ich schaffe damit mehr als 10 Stunden Bluetooth Hörzeit. Schön ist, dass das Gerät sowohl über Bluetooth als auch über USB an das Mobile Device gekoppelt werden kann (und dann auch mit Strom versorgt wird). Ich nutze es nur noch per Bluetooth, da ich keinen Unterschied wahrnehme (siehe oben). Über die Haltbarkeit kann ich nach 2 Wochen Einsatz noch nicht so viel sagen aber bisher macht sich das Gerät gut und der Clip zum Befestigen an der Kleidung, etc. ist gut. Die Bedienung über die Tasten am Gerät ist ok. Man muss sich die Lage und Funktion der Tasten am besten einprägen, sonst ist es etwas hakelig. Der Preis ist für dieses Gerät angemessen, insbesondere, da der Sound gut ist sowie die App und die Bluetoothkopplung gut funktionieren. Läuft bei mir mit iPhone 12 (Bluetooth) und IpadAir 4 (Bluetooth + USB).

Mi è piaciuto immensamente, da non credere..! E' vero, è di plastica, piccino piccino, costa sui cento euro, ma la resa sonora che restituisce non ha eguali, nemmeno con cell ultima generazione...Ha potenza da vendere, sui cell e su tablet, te la sogni, durata batteria minimo minimo sette otto ore (dipende in gran parte dal volume) ha il plus di avere due uscite cuffia, tradizionale da 3,5 e bilanciata da 2,5 per chi ha cuffie idonee, o ha cuffie o IEM con cavo staccabile, per ottenere un suono di qualità superiore! (mi sto attrezzando) Ha i soliti comandi, anche se tasti piccoli, commisurati alle dimensioni del corpo "macchina"...power, volume, salta traccia, e un mic dalle prestazioni quasi pro. Mic che si può utilizzare, volendo, per non isolarsi completamente dall'esterno; modalità surviver in città! E non è finita qui, la vera chicca è la sua app, completissima, per qualsiasi tipo di regolazione, dal bilanciamento dei due canali, al tipo di uso che se ne vuole fare; ampli, o solo pre (io lo uso così, avendo due Cmoy , non quelli delle pasticche americane, evoluti e modificati, con doppio AD 797N single, montati su browndog, e OPA 823), o avere il doppio di potenza per cuffie "difficili", ma non si spaventa nemmeno con le mie "880" da 600 ohm! E poi equalizzatore, BT, quasi tutti, dac doppio per prestazioni superiori ecc. ecc. Tutto un mondo da scoprire, ci vorrebbero ore per descrivere tutte le opzioni..! E' leggerissimo (e vorrei vedere) ha una clip per agganciarla a...dove volete! Si carica velocemente, con la possibilità di non caricarlo al 100%, secondo il produttore può allungare la vita utile della batteria, e via dicendo. Insomma, una vera scoperta, piacevole. Ha scardinato l'opinione comune che il BT è inferiore al cavo, sarà, ma in questo caso la differenza è davvero inudibile! E poi suona, suona veramente...la musica scorre via facilmente, è trasparente, non si intuiscono i dettagli, si sentono, eccome , ha una estensione di frequenza eccellente, bassi stretti, potenti e profondi, gli alti sono dolci, ma dettagliati, i medi presenti, lucidi, dulcis in fundo, presenta un palcoscenico ampio e profondo quanto basta, ma anche di più! insomma una vera ...goduria! Chi vuole provarlo e se lo può permettere, non resterà deluso...Attenzione, non è un lettore, per questo c'è altro, ma abbinatelo con uno di buona qualità, e ne sentirete delle belle! Consigliato? Dopo tutta questa "tiritera", certo che si. Amazon, grazie, anche se viene spedito dalla divisione europea Radsone, che è il produttore. Buon ascolto.

Enjoy your headphones to their full glory with this amazing DAC. Near perfection for wireless high-end HiFi. Powerful amplifier let's you wireless enjoy your studio headphones anywhere, all day. Bought this DAC especially for testing various modified Koss KSC75's and Koss HP30's that require that extra dB output this EarStudio hides under the hood. Priced at around $100, this gem turns the $20 Koss KSC75 into the league of audiophile headphones of $ 500 plus. But no USB C, so charging and operating as USB DAC is like Russian Roulette. ( As goes with mobile equipment with USB connection ) . After three weeks of daily usage, the USB connector was moved a few millimeters and the case surrounding the USB connector shows damage and reveals the white plastic of the case. The case is painted in aluminium look with very thick layer of paint. This makes the icons on the buttons hard to see and caused the track selection button to stay pressed inwards. I returned mine and wait for new one, falling back to my second choice, the comparable FIIO BTR3K that lacks the extra stamina and output power of the EarStudio but is build around the same chipsets in a very durable casing. For my new EarStudio i will only use a decent USB cable (from my Jabra Evolve 40 headset) and have to handle it with some extra care when on the move as I am hooked to the vast customization options that give me the most deep felt music experience outside a studio.

Great value item with good sound quality. Companion app has a lot of useful features and allows for high degree of customization.

I purchase this for providing amps to my beyerdynamic studio headphones and it supplies amps exceptionally well. Only problem is battery its not working more than 2 hours.