Under the hood.
While we can argue that it’s not the chipset but how you implement it that makes a difference, at the time of its release SP1000 was one of the first manufacturers to introduce the latest flagship AKM AK4497EQ DAC, using 2 separate DACs for the left and the right channels. A&K didn’t share any further details about the design of the internal headphone amp section, but certainly it’s more powerful from the balanced output in comparison to their previous flagships. While single ended output is still 2.2Vrms, balanced output almost doubled to 3.9Vrms, which roughly translates under 32ohm load to about 475mW of power. This is plenty of juice to drive even some of more demanding headphones which I’m going to cover in the pair up section of my review. I was also impressed with SNR spec of 122dB in balanced output which certainly reflects in improved dynamics of the sound.
The touch display is a very responsive 5” high definition (720 x 1280 resolution) screen. By smartphone standards this resolution is average, but considering this is audio only playback device, it’s more than adequate. The interface is very fast, thanks to octa-core CPU. I didn’t notice any lag, and the navigation and audio decoding was a breeze. You need this processing power to be able to get flawlessly through audio decoding while supporting all the popular lossy and lossless formats of WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, and DSF, with PCM rates up to 32bit/384kHz and DSD rates up to 11.2MHz (DSD256).
And for high resolution files you have plenty of storage with internal 256GB of NAND flash storage and microSD external memory expansion up to the latest largest capacity card. Furthermore, USB-C OTG supports external hard drive storage or usb stick expansion. You also get a decent battery life, thanks to 3,400 mAh li-po battery where I verified 11hrs 45min playback time of mp3/flac files in a loop with a screen off using IEMs connected to 2.5mm balanced output. Of course, this is a best-case scenario, but that’s what I use in DAP comparison. Also, when you need to charge it back up, SP1000 now supports a Fast Charge which takes under 2hrs to get it from empty to 100%. You can either use a regular 5V/2A charger or a Fast 9V/1.67A charger.
To support fast charging and to speed up data transfer, SP1000 also features USB 3.0 Type-C interface for charging, data transfer, and USB DAC functionality. You still have WiFi 802.11 b/g/n (2.4GHz) support for OTA firmware updates and TIDAL streaming, and Bluetooth v4.1 Wireless supporting A2DP and AVRCP profiles, and aptX and aptX HD protocols. Also, in addition to 2.5mm BAL output, 3.5mm SE port is multifunctional for headphone out, line out, and optical digital out.
But probably the most impressive part of this spec is that A&K went from their previous AK380 flagship to SP1000 with an upgraded DAC (from dual AK4490 to dual AK4497EQ), higher balanced output power (from 2.2Vrms to 3.9Vrms), bigger display (from 4” 480×800 to 5” 720×1280), faster CPU (from dual-core to octa-core), faster USB data bus (from USB2.0 to USB3.0), and even faster charging (from general 5V @2A to fast charge 9V @1.67A), while the price remained the same. True, the price is still at a premium level, but this was a HUGE upgrade while the price didn’t change.
I’m often being asked why I go into so much details describing the GUI. I review a lot of products, including many DAPs, and often 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 “reach out” to my review if I don’t remember the answer 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-crown and after waiting for about 10sec as you are greeted with “A” symbol, you arrive at the Main Playback screen of the SP1000, also accessible by pressing a touch Home button at the bottom of the screen. Thanks to a large 5” display, there is plenty of room for a clear view of the interface with all the controls out in the open. 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, Store access (Groovers+ and TIDAL), 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, Gapless, 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), CD ripping (for external ak unit), usb mode (MTP or USB DAC output), usb audio (DSD converted to PCM or DoP), S/PDIF conversion (upon connection, enabling selection of bit depth and sample rate). 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.
Despite AK4497EQ DAC support, 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 Pro EQ preset is available and it makes the sound smoother, making it more natural and more organic. Otherwise, there are no 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 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 semi-Parametric with a full GUI view of the EQ shape where underneath you have FREQ band selection (a choice of only 20, thus it’s not fully parametric), Gain selection in 0.1 and even 0.01 micro adjustments, and Q bandwidth selection in 0.1 increment adjustments.
This semi-PEQ interface looks great and has a perfect layout, but the actual adjustment has a very subtle effect on the sound. I was a little puzzled by this, because +/- 5dB adjustment of any band (the slider range) should be more audible, but not in this case. I personally don’t use EQ, so it’s not a big deal for me, but if you are a frequent EQ user – please be aware.
The whole interface is very intuitive, has a very logical layout, and very easy to read and to navigate. I like the big display with its big control touch 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.