Audiophilepure

https://www.innerfidelity.com/content/astell-kern-sr15-anorma-review

“If you’re looking for something pocket-friendly that can take advantage of digital audio in both a wireless and wired world and replace your mobile phone as your main music experience that does streaming services like TIDAL, Qobuz, Deezer or Spotify via wi-fi, has gobs of internal storage, can handle every file type imaginable, and won’t break the bank, then the Astell&Kern SR15 at $699 USD is a no-brainer. The increase in SQ over the iPhone/Lightning/Buetooth pairing is obvious, and the fact you don’t get interrupted by a call or text while listening is a huge bonus for me personally. When I’m listening to music, I’d rather not be distracted with social media, the Internet, etc. That said, the fact that the A&norma is a separate unit, it allows unhindered listening while you work on your laptop or scroll Instagram on your phone, so it’s a bit of a win-win from either angle. For the level of SQ, wired and wireless feature set, and future-fi that the SR15 has built-in at its price point, I can only highly recommend it.

“The DX160 will operate as both a transmitter and a receiver and connect to multiple wireless devices using Bluetooth 5.0. You can also access some app control features though this will largely depend on the apps you are using.

I found it relatively easy to connect my Samsung Note 9 to the DX160 and by simply switching on the ‘Bluetooth DAC+AMP Mode’ in the Bluetooth menu after doing the initial BT pairing process. I was able to automatically stream audio from the Note 9 to the DX160 using any music app. That also included streaming apps such as TIDAL which sound excellent on the DX160 via the Note 9 BT connection.

Because BT5.0 allows Bi-Directional support you can also flip the audio experience and stream your audio from the DX220 to a receiver of your choice such as a smartphone or another DAP since it is backward compatible with BT4.2. I had no issues streaming from the DX160 to the R2R200 Black, for example, or any Bluetooth active wireless speaker within range.”

https://hometheaterhifi.com/reviews/audio-player/portable-audio/astellkern-kann-cube-digital-audio-player-and-billie-jean-iem-review/

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There are no user-selectable digital filter options for the Astell&Kern KANN CUBE. The above digital filter test is based on a protocol suggested by Jurgen Reis of MBL Audio. This noise test shows the characteristics of a sharp filter that is flat to 22 kHz (with a 44k sample/sec input) with a steep roll-off thereafter. The reconstruction tone of a 19KHz signal is down 65dB. This is as it should be. Some products have filters that can produce a high-end droop and minimal rejection of the 19kHz reconstruction tone.

All in all, from an objective standpoint, the Astell&Kern KANN CUBE produces impressively low THD+N numbers and has excellent linearity characteristics. One should have no qualms using it as a source component in a high-end stereo system let alone in its intended portable use.”

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“The phrase that keeps sticking in my head is “an everyman sound with dollops of detail”. Make sense? It does if you enjoy a wide range of genres and it most certainly applies if you err towards the slightly smoother, euphonic or even-harmonic tone in playback. If you enjoy the wetter side of things, hate the dry, the splashy or the analytical then the A01 motherboard will appeal.

But before you lie back and dream of colorful lush overtones, let me shake you from that potential aural meme by telling you that the A01’s dynamic range performance is strong. The amplification stage in the N6ii’s motherboard is an excellent performer and produces enough power and clarity to dispel any notion that the N6ii/A01 combo is a leisurely romantic stroll. It is forgiving with a ‘bit of soul’ but not without some excellent levels of detail.”

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“The FiiO M11 came in an attractive black magnetic clasp box with a slip-on black outer picture sleeve. Inside was the M11 in a heavy clear plastic skin with a 7H tempered glass screen protector pre-applied at the factory. The unit is black with a gold-colored tactile volume control and a faux carbon-fiber textured glass back. Size-wise, it is the same as the X7 Mark II and X5III though it is shaped slightly different so it might not fit in the same cases. (It is beveled on both edges, making it a slight challenge to get in and out of the plastic skin.)

There are two tactile buttons along with the volume control (pause/play switch and FF/RW toggle) on the left edge and the two micro-SD card slot on the right. On the bottom, you will find the 4.4mm and 2.5mm balanced outputs next to each other on the left, the USB Type-C connection in the middle and the 3.5mm (single-ended/coaxial digital/line output) output on the right. The power button is on the right top.”