Astell & Kern A&norma A&K SR25

Design.

You can’t start talking about the design of SR25 without mentioning the tilted screen.  A&K created quite a stir when they introduced the original SR15.  The idea behind it was based on the analysis of how we hold the DAP in our hand, especially as small and compact as SR15.  It is different when it comes to balancing a bigger and heavier DAP, but A&K design team decided that a tilted screen will be aligned “straight” when we naturally tilt our wrist holding SR15.  SR15 display does look straight in my hand, and it was less noticeable when looking at the DAP due to a darker color of SR15 body.  With a silver color of SR25, the tilted angle of the black screen is a lot more noticeable, though it still works similar to SR15 – relative to the angle of my wrist the display was aligned straight.

ak_sr25-20

From the exterior perspective, the design went through a lot of changes between SR15 and SR25.  The chassis are wider and longer, now measuring 63.5mm x 16.1mm x 108.3mm to accommodate a bigger upgraded HD touchscreen, from 3.3” (SR15) to 3.6” (SR25).  The display is not just bigger, but also has a higher resolution and deeper and more vibrant colors.  The difference here is really night’n’day going from original 480×800 display to higher resolution 720×1280 WVGA TFT LCD touchscreen.  And with a bigger screen and slightly bigger size, the weight went up as well, 178g (SR25) from 160g (SR15).

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The body is still metal (aluminum) with an asymmetric tilted screen in the middle.  The color of SR25 is moon silver, and like the original SR15, the back has carbon fiber glass inlay.  The bottom of the chassis has usb-c port for charging and data, and next to it is a spring-loaded microSD slot for a flash card, so you can expand its 64GB internal memory with up to 1TB of external.  Right side at the top has the volume wheel, taller/deeper than original SR15, and with a new watch-crown design.  The top has 3.5mm SE headphone output, 2.5mm BAL headphone output, and a power button with a typical long press to turn power on/off and short press to turn screen on/off functionality.  On the left you will find 3 identical playback control buttons with play in the middle and skip above/below it.  The shape of the buttons is now similar to their upper end models.

The overall design of SR25 has a more premium look to align it better with futura and ultima series, including all these angled asymmetric lines on the front, back, and all around.  SR25 really does look like mini-me version of their upper end models.

Under the hood.

While a few things haven’t changed moving from SR15 to SR25, like dual CS43198, or 64GB internal storage, or the headphone output voltage with 3.5mm SE (2.0Vrms) and 2.5mm BAL (4.0Vrms), a lot of others things have been updated.  Still get playback of all the popular formats of WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF, MQA, with sampling rates of PCM (8kHz-384kHz), DSD64 (2.8MHz), DSD128 (5.6MHz), plus SR25 now also adds native support of DSD256 (11.2MHz).

As already mentioned, low res 3.3” 480×800 screen has been upgraded to 3.6” 720×1280.  No more micro-usb port, SR25 now up to date with USB Type-C.  Bluetooth also saw a big update with SR25 now supporting LDAC codec in addition to aptX HD.  Still OpenApp and MQA support, and SR25 fw is based on Android 9.0 with additional sound optimization, including Performance Mode to optimize playback of high res audio files.

ak_sr25-11

And despite using the same size battery (3,150mAh 3.7V Li-Po), A&K managed to double the playback of SR25 in comparison to SR15.  As a matter of fact, while playing 24b/48k high res FLAC, 2.5mm balanced output, using average sensitivity/impedance IEMs at normal listening volume level of v50 and with wifi/BT off, I was getting a solid 22hrs 25min of playback time!

ak_sr25-09

Page 3 – GUI overview, and Open APP Service.
Page 4 – Sound Analysis and Comparison to other DAPs.
Page 5 – Pair up, Wired & wireless connections, and Conclusion.

37 thoughts on “Astell & Kern A&norma A&K SR25

  1. Nice review as always. Good work!
    I’m debating between Cayin Ni6II e02/t01 bundle and SR25. Currently own andromeda and ier-m9. My taste of music is pretty diverse, I listen to pretty much every genre. Would love to hear your thoughts on these two DAPs. Since you have tried both, which one would you prefer? Looking forward to your reply. Best.

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    1. these are in a totally different categories, your typical apples/oranges 😉 SR25 is a nice little compact dap for IEMs, BT pair up, and streaming of a handful of popular app. N6ii is a full android modular design dap (2x the price, and more if you add dac/amp cards) where you have full access to Google Play to install anything like on a phone, and also the cards are more powerful to drive demanding headphones (E02 is Class AB amp). For Andro and M9, SR25 will be plenty, and AK daps are very quiet with sensitive iems, while N6ii will have some hissing and might be an overkill for you. So, as long as you are not planning to get some high impedance Senns cans or current-hungry planar magnetic headphones, you are OK with SR25 🙂

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      1. Thanks a lot! I will order for SR25 then. Really appreciate your insights.

        Take care and stay safe 🙂

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    1. You will be surprised, considering every week I’m flooded with questions from people asking me which $2k-$3k earphone they should get and then which $1k-$2k earphone cable they should complement it with.

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  2. Bought a Sr25 a, couple of weeks ago and really disappointed with the WiFi. I use Tidal a lot and the WiFi drops out when 3 meters from my router.
    Also major issue with Bluetooth, hard to connect to devices and suffers also from drop outs.
    Sent back to supplier and waiting for their feedback.
    PJA

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    1. Sounds like something is off with your device. Usually, A&K daps have one of the best wifi performance. SR25 Bluetooth signal is not as powerful, I mentioned that in my review. And I think it is due to battery life, they extended it to 22+ hrs (something gotta give). But worth a shot if your replacement will work better.

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  3. I bought one, and am happy with it except for one glaring issue, one that doesn’t seem to come up in any reviews I’ve read so far and its a borderline dealbreaker.
    If you have a MacBook Pro, you have to download Android File Transfer in order to move your music on to the device. This is my first Android device so I’ve never used AFT. It’s buggy, and crashes / disconnects during transfers, to the point it’s unusable. I’ve seen this issue mentioned many times in forums, but not in any reviews. I’m guessing no one reviewing it is using a Mac, so just a caveat to think twice about buying one if you’re using a Mac. Cheers.

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    1. Sorry, I don’t use Mac, Android/Win only, but I heard from many of my readers they use *only* Commander One for MAC to manage their android based devices. It’s a more advance and mature program. Try it.

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    1. In terms of the sound quality they are close when it comes to iems or any easy to drive headphones, but with harder to drive headphones and some iems with EST drivers dtr1 will have an advantage. And of course, in terms of usability, these are night and day.

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  4. Hi

    I just got the SR25 today and I’m having issues with the GUI. Whenever it’s turned on it scans the media which results in lag and when I try to browse music it jumps in and out of the menu and to the main screen. Have you experienced similar issues?

    Regards
    Casper.

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    1. (since your comment got posted 3 times, I only keeping one ;)). No, I haven’t experienced this issue. Did you copy your files to internal storage or micro SD? If micro SD, could be an issue with reading a card? Is your screen wiped clean, just make sure no oil fingerprints causing “ghost” touch screen effects where GUI does random thing. Doing factory reset and also verifying to make sure you have the latest fw – always a good idea. And after you update the fw, do another fw reset. If everything else fails, post this question on Head-fi, A&K rep (Jason) is always there.

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      1. I’m sorry it got posted three times! Haven’t used this WordPress thing before 🙂

        I took my microSD card from my iBasso DX120 and put it in the SR25. It has always worked on the iBasso.

        I have tried to clean the screen and I even took off the protective thingy and it the issue is still there.

        I’ve downloaded the latest fw and I did a factory reset when I encountered the problem first but it still jumps in and out of the menus.

        I’ll try Head-fi, thanks for the answer!

        Regards

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      2. I just put in my 256 GB card and the issues seem to be gone. I’ll try to format the 512 GB card,

        Thanks.

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  5. Thanks for the review.
    And now I’m making decision between SR25 and Lotoo PAW6K.
    I use streaming often but I think the BT DAC will work for me.
    My IEM is 64audio Trio and I prefer a relax sound with wider stage, any advice of the choice? Or any other DAPs to recommend?

    Thanks.

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    1. Paw6k will have more relaxed sound, and overall more refined technical performance. But you are paying 2x for it. SR25 is a better value due to its outstanding battery performance and streaming support.

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      1. Thank you for the quick yet useful reply.

        Here in Chinese market, brand new P6K will “only” cost about 1.5x SR25. Anyway, SR25 seems to be a decent choice. A rarely used one will cost even less.

        If I extend the choice to PGT and SP1000M, do you think the combination can produce the so called “holographic soundstage expansion” with the Trio?

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      2. I just tested side by side trio with PAW6k and SR25, just to refresh my mind. SR25 soundstage is wider and more holographic from 3.5mm output vs 3.5mm PAW6k output (I’m using stock 64audio cable). If you go to balanced, it will be even wider. So, my suggestion to you, go with SR25 and update Trio cable to balanced termination.

        Liked by 1 person

    1. any DAP that supports MQA hardware decoding and has android to run Tidal app. All the latest A&K DAPs (SR, SE, SP) support that. And you also got Hiby and iBasso daps and some Cayin daps (N6ii doesn’t support yet, but N8 does).

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      1. different, not better. In terms of tonality, N6ii with T01 will be closer to SR25. E02 has a more natural analog tonality with a punchier bass, and its Class AB amplifier can drive some very demanding headphones and earphones.

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      2. Ahh… thank you SO much. Just got the MEST and LeonidesII today, and I’m blown away! Using it with SR-25 and loving it, and just wondering if I should take advantage of Musiktek’s 4th of July sale on the N6 w/EO2 MB…

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