Some ask me why I go into so much details describing the GUI. I review a lot of products, including many DAPs, and often being asked numerous questions after the review, days, weeks, and many months later. Sometimes I don’t have DAP in front of me at that moment, and it’s easier to reference my review if I don’t remember off top of my head. Also, you can think of this GUI section as a user guide, to make sure you didn’t miss any hidden gems.
Once you press the Power and after waiting for about 20sec as you are greeted with “A” symbol, you arrive at the Main Playback screen of SR25 which is identical to SPK and SP2k, and also accessible by pressing a touch Home button at the bottom of the screen. What is interesting, SR15 with a smaller screen had a slightly different playback screen layout, but thanks to a large display of SR25, there is more room now to have the same familiar layout as SP flagship models. The embedded artwork (with cover art) window occupies top half of the screen, tapping on it expands the view and shows lyrics if one is available. Swiping artwork window left/right skips to prev/next song in your playlist. Above it you get a summary of song format (file type, bit depth, and sampling rate), with a link to Now Playing (where you can edit/modify from within) in the upper right corner and a link to Navigation Menu in the upper left corner.
Right under the artwork window there is a thin strip of transport control to fast forward/back by swiping through the song. Of course, you can also do that by holding Next/Prev touch buttons or physical playback control buttons, but I have a feeling majority of users will probably prefer to take advantage of touch-swiping through the song. While this control strip is narrow and requires user to be careful where you tap, A&K came up with a clever way for you to see the current song position as you swipe by turning the whole artwork window into semi-transparent transport control and literally expanding the swipe area to the entire screen when you touch and hold it.
In the lower half of the screen you have a row of controls with a left arrow (taking you back to the current folder you are in, along with a storage info), ‘+’ to add to the playlist, ‘…’ with a link to a detailed ID tag song info, and two right-most icons to control the playback by selecting play all, repeat, repeat one, play through and random. The playback section also gets reflected in notification bar area of the DAP, all the way at the top. Below this row of controls, you have a song name with an artist and album name, and 3 playback touch buttons with Play/Pause in the middle and Skip Next/Prev on the sides. The buttons are large and adequately spaced so it’s easier to tap them.
The Navigation menu, accessible by pressing “A” in the upper left corner, takes you to a list with various Sorting option (song, album, artist, genre), Playlist, Folder view, MQS, CD library, Services, and Settings. You can also access this screen by swiping display to the right from the main Playback screen, where you can also swipe to the left and get into Now Playing screen. Under every sorting option you have other options to add songs to playback queue, different layout to view album (single, double, or triple columns), view artist with every album under each name, genres according to id tags, and my favorite Folder browsing which also gives you extra info about internal storage.
Settings menu is very important, but you can also access some of the shortcuts by swiping the screen down to see what’s available in Notification area where you can toggle Wi-Fi, Bluetooth, EQ, USB mode, external usb, AK connect, Line Out, Car Mode, Wheel lock, and shortcut to the main Settings menu. Many of these toggle options don’t just enable the functionality, but if you long press on it – will take you to the menu of that functionality. In the main Settings screen you have Wi-fi, Bluetooth, AK Connect, then Equalizer, Gapless, Line Out, L/R Balance, Playback setting (location where you add the songs in now playing and other options to add a song), Notification Panel (to customize shortcuts in notification bar), CD ripping (for external AK unit), usb mode (MTP or USB DAC input), usb audio (DSD converted to PCM or DoP), S/PDIF conversion (upon connection, enabling selection of bit depth and sample rate), and Car Mode (enabling). Other options are DAP related, like brightness setting, date & time, device name, language, keyboard, Power settings (power, screen, sleep setting). And of course, Update, System Info, and Default settings reset.
Typical of all A&K models, access to DAC filters is not enabled. Would have been nice, but A&K is very specific about sound tuning of their DAPs. Another thing is EQ. One Normal EQ preset is available and no other genre specific presets, but you can create your own ones. EQ interface is very polished and has two modes, Main and Advance. In the main mode you have standard Paragraphic EQ sliders covering 20 bands (30, 45, 60, 90, 120, 180, 250, 380, 500, 750, 1k, 1.5k, 2k, 3k, 4k, 6k, 8k, 12k, 14k, and 18k) where you can either slide the bar or use a more precise 0.1 adjustment of the gain, as well as scrolling through available frequencies. And as you adjust, it gets reflected in the lower right corner, showing you overall shape of the EQ. Switching to Advance, turns EQ adjustment into Parametric EQ with a full GUI view of the EQ shape where underneath you have FREQ band selection (a choice of 20), Gain selection in 0.1 and even 0.01 micro adjustments, and Q bandwidth selection in 0.1 increment adjustments.
This PEQ interface looks great and has a perfect layout, AND the actual adjustment has a more noticeable effect on the sound. I can only speak of SPK and SP2k where PEQ still had a subtle effect, so I was very pleasantly surprised that in SR25 the parametric equalizer actually more usable!!!
The whole interface is intuitive, and very easy to read and to navigate. I like the bigger display of SR25 (vs SR15) with its intuitive touch control buttons and easy to read menus. I like Home touch screen button which always takes you back to the main playback screen, and I like the notification bar at the top with all the available info (volume setting, playback setting, enabled controls, battery icon with percentage indicator and time display), and I like shortcuts to the main controls once you swipe the notification bar down.
And of course, the Floating Back button is another plus, though it can be easily disabled by dragging it to the middle of the display or enabled/disabled in the Settings menu under Input Method. The button itself is floating and could be moved to anywhere along the left/right sides of the screen. You still have a Home touch button in the center under the visible part of the display, and when browsing A&K menus and settings you will find Back button at the top to go to the previous screen.
Open APP Service.
Since Open APP Service is now implemented in all of their Android based DAPs, such as SP1000 SS/CU, SP1000M, SE100, SR15, and SP2000 SS/CU, SR25 is no exception. More info could be found here where Astell & Kern goes into details about how to install and to use it.
When you start dealing with Android apps, in many cases you do need a Back button for navigation, and now you have one which going to come in handy when dealing with streaming apps. While Astell & Kern offers a built-in Tidal service (without off-line storage support), for a long time their customers been asking to add Spotify, Qobuz and other streaming services. A&K latest DAPs do run on Android, but it’s a heavily modified closed OS without access to Google Play. In a way, it’s a blessing for a manufacturer to keep DAP performance optimized since you don’t have to worry about customers installing and running other unstable apps.
Now with Open APP Service you have more freedom, but the list of allowed apps is reasonably limited to about 21 apps now. And when you decide to install a non-blacklisted app, you need to download APK file (use a site like https://apkpure.com/), copy it to Open Service Folder located on internal storage, go to Services on the DAP, and when you see the app being recognized and listed in there – click to install it. Keep in mind, for example, you will have to install Tidal apk if you want off-line downloads. Also, installed apps will not be updated automatically since you are not running Google Play. You will have to keep track of app updates and manually download and install new versions.
I installed and used without a problem Qobuz streaming app and was able to download off-line content in Qobuz just like I would on my smartphone.