Both devices feature hands-free calling and support for high-res Bluetooth codecs although the BTR3 goes a step further by adding aptX-LL (Low Latency). The EQ supplements the nearly-missing EQ functionality of the iPhone's Music app nicely. The interface is intuitive and easy to use.

EarStudio ES100 MK2-24bit Portable High-Resolution Bluetooth

At 26ohm, the Neo are very easy to drive so ES100 have no problem making them shine. I feel the bass was more tigh even if punch gain in authority, the spacious soundstage was perfectly layered without any harshness, it was a warm but more energic presentation that give Meze extra life and faster presentation than with smoother DAP like X3II. Very engaging sound experience and now i'm curious to know how it could sound with balanced output....need to find a cable ASAP! In terms of audio quality, the Ampio performs well. Compared to the Earstudio’s AK4375a, the Ampio uses the DAC function embedded in the Qualcomm CSR8675. The quality doesn’t differ all that much but the ES100 has a higher output power and lower noise floor. All in all, ES100Mk2 is perfect for its price, and if you’re looking for a high-quality Bluetooth receiver, I fully recommend considering ES100Mk2 for its sonic performance, reliable connection and light weight. The ES100 has almost completely replaced my other portable headphone amps (Walnut F1 and Auglamour GR-1). Not only does it sound better regardless of how you're opting to connect to your device, but its also smaller, lighter, and has a vastly longer battery life. Provided the codec is supported at both ends, the ES100 allows the user to force use of a particular BT codec.Let’s face it: making small devices output large quantities of power is a difficult task. Somehow, though, Radsone managed to create a device that’s really compact but which features large output power in balanced mode. In fact the power output in unbalanced mode is quite modest, but in balanced mode it’s enough to drive even relatively demanding headphones. It won’t be able to drive super-demanding headphones (e.g. 300+ Ω) and it will probably struggle with some planars, too, but it’s going to be more than good with anything else. The ES100’s Advanced Hammer Action IV-F (AHA IV-F) keyboard action has been developed to represent the distinctive touch of an acoustic grand piano. Its springless technology and sturdy construction delivers consistent upward and downward motion for a smooth, natural, in the “analog volume” section one can set the volume and related things, such as per-channel volume reduction and max volume limit; there is also an estimation of the output level that requires one to input the impedance and sensitivity of the headphones in use (by the way, it confirms my previous estimates: I listen to music at a volume that’s between 65 dB and 70 dB, and anything louder than that becomes fatiguing to me);

ES100 MKII – Bluetooth Receiver Extends My EQ Earstudio ES100 MKII – Bluetooth Receiver Extends My EQ

I'm not a big EQ user, because must included with DAP did not work well, but this one take me by suprise and is fun to play with as well. It really can modulate sound rendering precisely and I solve some earbuds and iem sound issue with it, like earbuds that was bass anemic became more bassy without creating distortion or artificial rendering, wich was just incredible really. This EQ is a masterpiece IMO.

Sound

The bass if ES100MK2 is fairly deep and full, with a bit of warmth applied to the midrange too. The bass is not necessarily basshead, but it has good substance, and especially if you have a brighter, or neutral IEM, it should give them a bit more soul and life. Especially with Headphones like HIFIMAN HE400SE (review to come soon), I had an excellent overall experience, with good overall depth, good impact, and excellent overall dynamics. Featuring 88 grade-weighted keys, the ES100 keyboard responds just like a real grand piano, and is therefore an ideal choice for beginners seeking a starter instrument on which to learn. However, its realistic, acoustic-like touch will also appeal to more experienced players looking for a second piano for after-hours practise, or to simply enjoy a little music at the holiday home.

Focal | Focal Audio kit automobile K2 power EC 100 K - Focal | Focal

With 192 note polyphony, the Kawai ES100 beats other digital pianos that are in the same price range. This means that the keyboard can produce 192 polyphony notes without increasing the price of the piano, while other pianos in the same price range may only be able to produce 128. Sound technology The BT started to frequently disconnect after several weeks of use, and it only has use as a BT receiver so such is disappointing. It seems to disconnect less after being left off / ignored for several days..current mode and the 2.5mm 1x voltage mode now provide the same output level at a give analog volume. SO it make lot of reason why I decide to give a try to this wonderfull all-in-one bluetooth receiver. Its hard to understand how such a small portable device can hide that much features as well as having 3.5mm unbalanced and 2.5mm balanced phone out, a mic, usb-otg dac-amp fonction and BT decoding trough 2xAK4375a hifi dac. But thats not all, Earstudio have its own APP to control every features of its device, and this too suprise me alot, its not a basic app that just control volume, in fact it take the ES100 to a next audiophile level by letting him configure every aspect of dac potential. We will talk about this later. How come one of the more sceptical dude about bluetooth technology sound quality became so interested in a Bluetooth device? How is it possible that even if he still don't get intrigued by must BT iem or headphones and don't care to try them, Nymphono was ready to sell an arm (but not its soul) for having the chance to write a review of this Earstudio first creation? Well, for two reason really, one being the hype that never go out of breath and second being the fact sound is processed trough a dual AKM dac before it feed your headphones or iem. Perhaps a third one would be: its not BT earphones and you can use all your favorite one with the ES100. Fourth could be as well that its LG G6 phone sound like soul less crap. ETC!

KAWAI ES 100 Portable Piano

Now I can say that the output is at least as “fun” to listen to as standard iPhone 6 SE output. It is also more clear/detailed, especially in higher frequencies. In terms of pairings, you can literally drive pretty much anything below 500 USD with ES100MK2, and just like HUD100MK2, it is perfect for both IEMs and Headphones, but ES100MKii has a balanced output too, not just a single ended one. So even BQEYZ Spring 2, or NX Ears Baso, MAS X5i, FiiO FH5S, or headphones like Verum One and HarmonicDyne Zeus will be driveable from ES100mkii.

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The Kawai ES100 has been created with the intention of creating the sound of a Shigeru piano by using a new sound technology called SK-EX Rendering Kawai has been crafting musical instruments for over 85 years, maintaining traditional processes while embracing the latest technical innovations. These decades of experience afford our engineers a wealth of knowledge from which to create stunning digital instruments, in a quest to perfect the art of the piano. It’s really a question of priorities. The ES100 has many features that made very little audible difference when I used them—the jitter reducer, the choice of reconstruction filter, the DCT filter, the DAC oversampling rate, and the additional codecs beyond AptX and AAC (although it is nice to have them). The EQ, on the other hand, has a huge impact on the sound. If there is an ES100 Mk.II in the works, my vote is for a more capable EQ, if it is impossible to update the current model’s firmware with one. After reading this Kawai ES100 review, you should now be able to decide if the Kawai ES100 is the right digital piano for you. With all the benefits that come with this digital piano, you really can’t go wrong. You’ll be able to play the music you want as there are plenty of sounds to play with.