Astell & Kern A&norma A&K SR25

Pair up.

Here is how SR25 pairs up with various IEMs, earbuds, headphones.  For the reference, I indicated the volume level in (v).  Each one was tested with a balanced cable.

Empire Ears Legend X (v70) – wide soundstage expansion, not super wide, but decent.  The typical L-shaped sig of LX in this pair up becomes more V-shaped.  Mids are there, clear detailed natural, but bass is ear-shattering with a very powerful deep sub-bass rumble and strong rounded mid-bass punch.  The bass is complemented by sparkly clear treble.  Perhaps, the signature is more reversed J-shaped.  And that bass slams very hard, making LX woofers to rattle your brain.

VE Sun Dice (v92) – wasn’t sure how SR25 will be able to handling these 180ohm earbuds.  The sound is still open and nicely expanded since earbuds are sitting on top of my ears.  But the sound sig is a little different, not as balanced like in some other pair ups, but rather more mid-forward.  Bass is slightly attenuated here, not rolled off, but just attenuated.  Mids/vocals are clear, organic, soulful, smooth.  Treble has a nice well controlled sparkle as well.  Personally, I preferred Sun Dice pair up with sources where its signature is more balance, but if you want to focus more on vocals, this will be pretty good.

Campfire Audio Solaris OG (v43) – nicely expanded wide soundstage, with a little more out of your head expansion, giving it more depth than width.  Overall sound sig is balanced with a smoother tonality.  Bass has a nice analog flavor with a deep rumble and an average speed punch (attack is a little slower, typical for DD performance).  Mids are smooth, natural, detailed, not too revealing.  Treble is well controlled, not exaggerated or fatigue.

Campfire Audio Andromeda (v45) – there are a lot of similarities in this pair up with Solaris.  The soundstage has a similar width and depth, with more out of your head depth.  The signature is also balanced and the tonality is smooth, but a little more revealing.  Bass has a good rumble and decent punch, but the quantity feels closer to neutral here, definitely not as elevated as Solaris.  Mids/vocals are smooth, natural, and at the same time with a better retrieval of details than Solaris.  The same with treble, I hear more sparkle with Andro than Solaris.

64 Audio Trio (v66) – wide soundstage expansion, actually soundstage is a little more holographic in this pair up.  The signature is nicely balanced with a natural detailed tonality.  Bass is very powerful in this pair up, going deep with a textured rumble and faster mid-bass punch. Mids are natural, detailed, with an excellent clarity, but the presentation is pushed slightly out of your head.  Treble has nice sparkle, non-fatigue, and still with a good sense of airiness.

64 Audio U12t (v66) – I hear a wide soundstage expansion, with a little more out of your head depth.  The overall signature is balanced, with a slightly mid-forward presentation.  Bass has a good depth and mid-bass punch, but it’s closer to neutral in quantity.  Mids/vocals are clear, natural, detailed, with a little more forward presentation in comparison to Trio.  Treble is non-fatigue, well controlled, clear, and with less sparkle than Trio.  Actually, with SR25, Trio sounds more fun, while U12t is more laidback.

Beyerdynamic T5p 2nd (v79) – wide soundstage with more depth than width.  Nicely balanced signature with a clear detailed tonality.  Deep analog bass extension with a textured rumble and fast mid-bass punch.  A little thinner neutral-bright mids/vocals with a nice layering and separation of sounds.  Good treble extension with a nice well controlled sparkle and airiness.  Surprisingly good pair up, especially impressive bass extension.

Meze Audio Empyrean (v91) – wide soundstage expansion with a little more depth than width.  The overall sig is balanced and tonality is smooth, but the sound presentation is more laidback.  This pair up is not exactly what I’m used to hear with Empyrean, bass doesn’t extend as deep or punches as hard, and mids are a bit too smooth and laid back.  Treble is very good, detailed and sparkly.  SR25 has no problem driving these planar magnetic headphones loud enough, but not to their full potential.

The bottom line, can it drive earphones and headphones loud enough?  Without a doubt it can!  I was even able to drive my open back 470ohm impedance ATH-R70x at 124 (out of 150) volume.  But, with more demanding higher impedance headphones and some planar magnetics that need more current, I don’t think SR25 was able to push them to their full potential.


Wired and wireless connections.

Besides being a portable DAP, you can expand SR25 functionality as a transport to drive external DAC/amp, to use external AMP, or to turn the DAP into usb DAC.  And of course, you don’t have to be limited to wired headphones, and can take advantage of Wireless Bluetooth connection.


Tested Bluetooth Wireless with various headphones, SR25 paired up within seconds and had the acknowledgement message on the screen that it was connected using corresponding codec.  I was able to change volume from SR25 and from wireless headphones, as well as control the playback and skip tracks remotely.  Wireless connection worked about 20ft away from SR25 in open area.  This is not the strongest performance like in SPK or SP2k, most likely due to reduced power of BT transmitter to save battery life in SR25.

Line Out.

Connected to FiiO E12A, I had to select Line Out from notification bar and was able to control the volume from both external amp and SR25.  If you need to color your sound with an external amplifier or need to drive more demanding headphones, access to LO is convenient.

USB Audio Out.

Connected to Lotoo S1 USB DAC/amp using Lotoo’s provided cable.  In notification bar of SR25 have to be sure External USB is selected to enable USB Audio mode.  Volume was fixed on SR25 at 150, and I can adjust it from S1.  Very clean and transparent sound based on sound characteristics of S1 DAC/amp while using SR25 as a digital transport.


Recognized right away by my ThinkPad T480s (Win10Pro).  In notification bar of SR25 have to tap USB Mode to select DAC.  Volume can be adjusted from Laptop or SR25.  No need to install any additional drivers, and the sound was typical of SR25 headphone output.


Every time I get a chance to review A&K DAPs, I get reminded how loyal their fanbase is.  Often after receiving different DAPs for review purpose and mentioning about it on FB or in corresponding Head-fi thread, people ask me about comparison to other DAPs in the same class, including if the price difference is justified.  When I acknowledged about receiving SR25 for review, most of the questions I received were from existing SR15 owners, asking for comparison and if it makes sense to upgrade.  That was exactly the reason why I asked A&K for SR15 loaner in addition to SR25, to answer the burning question about side-by-side comparison.

Similar to SP1000 vs SP2000, price of SR25 remained the same as SR15.  But SP2k upgrade was more about the finetuning, while SR25 upgrade was a step forward.  SR15 and 25 share a similar sound sig, and that’s about it.  As it was mentioned in the review, technical sound performance of SR25 is superior to SR15.  And on top of that, you have a bigger higher resolution display that looks night’n’day in comparison to SR15, usb type-c (vs micro usb), addition of LDAC (not holding my breath for 4.4mm, but LDAC broke the ice), stepping up to DSD256 (vs DSD128), PMEQ with a more noticeable sound adjustment, and the battery which now lasts almost 22.5hrs (vs 10hrs).  For the same price as SR15, it is no-brainer!

56 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.


    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 🙂


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

        Take care and stay safe 🙂


    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.


  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.


    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.


  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.


    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.


    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.


  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?



    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.


      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!



      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,



  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?



    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.


      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?


      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).


      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.


      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…


  6. Hi, i want to buy the Sr25, but I’m concern about one thing: You have this big wheel to adjust the volume – It’s certainly nice, but I intend to put the unit in my front pocket when i will listening to music. I’m afraid that the knob for the volume could accidentally going up or down when i put it in my pocket and when I’m walking – Is it something that can happend frequently ?



      1. Even when inside the leather case like the new Dignis case? Wouldn’t that case design help with accidental button pressing or hitting the wheel?


  7. Hello,

    I’m contemplating to get a SR15 or DX160. Currently, there’s a promotion going on where SR15 is having a roughly 50% discount and it’s priced at a price point similar to DX160.

    In my situation, do you recommend me getting the SR15 or DX160?


      1. Hi. Speaking purely on audio and on power output. Which do you consider better the cowon plenue 2 or the astell & kern sr25. Thank you


  8. Does the UI for this allow for “favorite” songs or creating playlists from internal storage? my main use for music outside of personal listening at home where i can take my time is “Set and forget” playlists for work over a BT speaker.


  9. I am currently trying to decide between the SR25 or a used Cube. My old AK70 broke and can no longer drive power to earphones, and when plugged into the car it has become less engaging.

    The new device will be primarily used to drive music to my car. Into the Mark Levision system via 2.5mm.

    I have a few questions:

    1) is the sound stage for the cube much better than the SR25?

    2) as the Cube can physically push more power, will this be a better choice for the car.

    3) I heard the Cube is more focused on mids and low. I am a bit worried as that sounds like you will lose the dynamics of the music.

    Looking forward to your inputs.


    1. I haven’t heard Cube, but for your car you don’t need high power DAP output, especially since you will be “double amping” the sound. CUBE has higher output power to drive demanding headphones, not really for car audio system. I think you will be better off with SR25. and I guarantee, at some point you will decide to enjoy the sound at home as well, and SR25 is a great little compact DAP, big improvement in sound over your AK70.


      1. That is a very good point! Plus the Cube is gigantic to carry around. I will go with the SR25!

        I have the Arcam 850 for the home theather. I just need something for the car.

        Thanks Twister!


  10. Hi Twister,
    I recently bought a CFA Solaris and wanted to update my old AK 70 II.
    Can you advise whether SE200 /SA700 will be significantly better than SR 25? I originally wanted to get Cayin N6 II but concerned about the background hiss.

    I have a diverse music taste – pop, rock, piano, some classics and Jazz. I do enjoy solid bass but don’t consider myself a bass head.

    As you have tested many DAPs, I value your opinion .
    Thanks for your sharing your expertise with me.


    1. Sorry, zero experience with SE200/SA700, so I can’t tell you if it will sound better 😦 But SR25 is definitely a big step up from AK70ii and SR15. Just make sure you are using 2.5mm balanced output, it is noticeably better than 3.5mm, so I would advice upgrading Solaris cable to 2.5mm termination.


  11. Hello, very informative review.
    I have a doubt: I bought a FiiO M9 Pro headphones and I was intend to couple with a Fiio M11 or a M11 Pro. In terms of sound quality, Do I loss much if I go with the SR25 instead of some of those Fiio`s?
    In my country (Chile) the SR25 is USD 649 (offer price) and the FiiO M11 Pro is USD 779
    Thanks in advance!


    1. Not familiar with M9 Pro headphones, thus hard to tell how they will pair up. I prefer M11 pro sound over M11. I can only suggest to take a closer reading at my comparison of SR25 vs M11 Pro and see which one will match your M9 Pro headphones better.


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