Audiophilepure

https://www.whathifi.com/us/reviews/astell-and-kern-sp1000m

“The screen looks great. Sharp, colourful and clear, and a long way removed from the old digital player experience of years past. It’s still not a flagship smartphone experience, though, so if you’re used to expansive screens where you can swipe to your heart’s content, this is not that. The keyboard is a little fiddly for our fingers and it’s not always instantaneous in its response. 

Inside, the CPU and DAC are the same as the previous model. So that means two AK4497EQ DACs, one for each stereo channel, and an Exynos 7420 octa-core CPU. What is new is an upgraded audio block layout, which aims to shorten the signal path and deliver better sound thanks to reduced noise and improved output level.”

https://www.headfonia.com/fiio-m15/

“The DAP is pretty to me, though that of course depends on your personal preference. On top you have the perfectly finished headphone and LO outputs as well as the volume dial. The positioning of the volume wheel is a bit weird depending on what you’re used to. Where we very often see the volume dial on the right, Fiio has placed it on the left. It’s special, but once you’re used to it, no problem.

All the M15’s button can be found on the left side. They’re rather plastic like but the design is nice and they fit perfectly in the case. On the right side? Nothing! On the bottom you’ll find the USB-C connector and the MicroSD slot. Almost forgot, the M15 has one button you can program yourself. Extra points!”

“The only glitch I experienced during playback was on DSD DFF 5.6 files played from a 128GB card. Every 30 seconds (or so) there occurred an extremely short drop out. IRIVER could not duplicate the bug when I sent them the file, but it occurred on two different CT10 players, so I suspect it was something to do with the card since these same tracks played correctly when the card was loaded into a A&K A&futura SE100. Overall the operational efficacy of the CT10 was on par with Astell&Kern’s other players. Its touchscreen responded with alacrity, and its menu options were well laid out.”

https://positive-feedback.com/reviews/hardware-reviews/fiio-m11-pro-android-based-digital-audio-player/

O”verall, Fiio have created a strong contender within the realm of digital audio players. The M-series of DAPs takes it a step further with an even more cohesive UI, beautiful aesthetics, and strong sound profile. Many users such as myself are happy with the inclusion of streaming services like Tidal and Spotify, which not all DAPs have the functionality to offer. Coupled with the powerful amplifiers and neutral but refined sonic presentation, the M11 Pro is an all-in-one solution equipped to service the modern audiophile’s needs. It will be intriguing to see what the Chinese audio firm will be next to release. Do stay tuned”

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.