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Astell&Kern A&norma SR25

High-resolution portable music player with Wi-Fi® and Bluetooth® (Moon Silver)

Item # 838SR25

The Astell&Kern A&norma SR25 gives you an incredible level of performance for a reasonable price.

The Astell&Kern A&norma SR25 gives you an incredible level of performance for a reasonable price.

Discontinued item
4 questions - 18 answers

Item # 838SR25

Since 1974

Years of experience making people happy.

60-day returns

If you don't love it, send it back.

Hands-on research

We double check the details on each item.

About the Astell&Kern A&norma SR25

A great value for high-res music lovers

I had an opportunity to try out the Astell&Kern A&norma SR25 portable player. Its milled aluminum case felt pleasingly cool in my hand, and simultaneously lightweight and substantial. I liked the precise, responsive control of the analog volume wheel, and the elegant simplicity of the touchcreen. But what I really loved most was the sound.

A great value for high-res music lovers

I had an opportunity to try out the Astell&Kern A&norma SR25 portable player. Its milled aluminum case felt pleasingly cool in my hand, and simultaneously lightweight and substantial. I liked the precise, responsive control of the analog volume wheel, and the elegant simplicity of the touchcreen. But what I really loved most was the sound.

With the SR25, Astell&Kern aims to make a high level of audio performance available to the masses, and what I heard didn't disappoint. Regardless of genre, the music sounded both spacious and full, with an incredible level of detail. Music I had listened to for years suddenly sounded fresh. In some cases, I actually heard things in the music that I had never noticed before.

Firsthand listening impressions

I was impressed with the amount of detail the SR25 provided. Like when I listened to Janos Starker play the Bach Solo Cellos suites, for example. Though a vintage recording (albeit remastered for SACD), I heard fine details like the bow biting into the string, and the soft hum of the sympathetic vibrations in the cello's open strings.

And the sound was equally satisfying listening to Bruno Mars. I heard additional layers in the backing rhythms. The bass was solid, the vocals crystalline. And the soundfield felt spacious enough to "fill the room," even though I was listening through headphones.

Made for high-resolution audio

The SR25 has a quad-core processor for fast and accurate decoding. Dual built-in high-performance DACs — one for each stereo channel - give you bit-perfect playback of high-res files up to 32-bit/384kHz. You also get native playback for 1-bit high-res DSD files up to 11.2MHz. And the player is compatible with MQA, yet another high-resolution format.

Couple the SR25 with a set of high-performance headphones and you're in for a real listening experience. The player has both a standard 3.5mm stereo minijack and a 2.5mm balanced 4-pole output.

Outstanding sound quality

You can play high-resolution downloads from sites like HDtracks without any additional equipment. Even with CD-quality files or compressed formats like MP3, the SR25 can help your music sound its best.

The player's high signal-to-noise ratio and low distortion let the subtle details of your music come through. Plus, its high-fidelity, low-impedance output gives your headphones more power than most portable music players.

Bluetooth® compatible for wireless listening

For wireless listening, the SR25 features built-in Bluetooth. Stream music to your Bluetooth headphones or speakers. The SR25 offers Sony's LDAC high-fidelity wireless music streaming to compatible products, for better sound via a Bluetooth connection.

Expandable memory

The player comes with 64GB of internal memory. A microSD card slot lets you add memory cards up to 1TB, for ample storage. And of course, you can have more tunes on extra cards and bring them along for easy swapping.


Product highlights:

  • compact high-resolution portable music player
  • plays MP3, FLAC, WAV, WMA, ALAC, Ogg Vorbis, AAC, AIFF, MQA
    • supports files up to 32-bit/384kHz
  • native Direct Stream Digital (DSD) playback (.dff and .dsf formats up to 11.2MHz resolution)
  • dual high-performance Cirrus Logic DACs (one each for left and right channels)
  • powered by a fast quad-core CPU
  • frequency response: 20-20,000 Hz
  • an ultra-low-noise filter for better sound quality
  • Bluetooth-compatible with LDAC high-fidelity wireless music streaming
  • built-in Wi-Fi to access home wireless network and internet
  • 3.5mm unbalanced headphone output
  • 2.5mm balanced 4-pole output for compatible headphones
  • 64GB internal flash memory
    • microSD card slot for cards up to 1TB (up to 1088GB total memory)
  • angled 3.6" color touchscreen
  • analog volume wheel provides fine level adjustments
  • USB Type-C interface (cable included) for high-speed file transfer and battery charging
  • output impedance: 1.8 ohms (3.5mm headphone output), 1.6 ohm (2.5mm balanced output)
  • signal to noise ratio: 122dB @ 1kHz unbalanced, 123dB @ 1kHz balanced
  • milled aluminum casing
  • built-in rechargeable battery offers up to 21 hours of continuous operation
  • 2-1/2"W x 4-5/16"H x 5/8"D
  • weight: 6.27 oz.
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # 13PPS217C-CMSIN1

What's in the box:

  • Portable digital music player (Moon Silver)
  • 40" USB cable (Type A USB on one end and USB-C on other end)
  • MicroSD card slot cover
  • Protective film
  • Quick Start Guide
  • Warranty

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More details on the Astell&Kern A&norma SR25

Mark G.
The Astell&Kern A&norma SR25 replaces these items:

Product Research


Overview: The Astell&Kern SR25 is a portable high-resolution music player that delivers high quality playback. It is the second model in the A&norma standard line of devices from Astell&Kern, following the SR15. The SR25 features dual DACs (digital-to-audio converters) with balanced and unbalanced analog outputs. It has an internal memory for storing your high-resolution music files, plus a microSD slot for external memory. The SR25 has a large 3.6" LCD touchscreen display, plus built-in Wi-Fi and Bluetooth.

Construction: The compact SR25 is only 2-1/2"W x 4-1/4"H x 5/8"D, and weighs 6.3 ounces. It is made from silver aluminum, and features an angled LCD touch screen. The SR25 comes with a protective film to help prevent scratches. Analog controls include a rotary volume knob on the right side, and Play/pause, Previous/rewind, and Next/fast forward buttons along the left side.

Digital Storage: The SR25 has a built-in 64 GB internal memory. You can also insert a microSD card in the external memory card slot on the bottom of the device. The maximum capacity of the microSD card is 1 TB.

Dual DACs: Like its predecessor, the SR25 is equipped with two Cirrus Logic CS43198 Master Hi-Fi level DACs. The SR25 adds a new, faster Quad-Core CPU to make your digital files sound better by removing noise and reducing distortion, and provide a faster, more intuitive user interface. The device plays any resolution of digital files up to 32-bit/384kHz, bit-for-bit. In addition, the device supports native DSD256 playback. The SR25 supports the following Audio Formats and Bit Rates:

  • Audio Formats: WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF, MQA
  • Sampling Rates:
    • PCM: 8kHz - 384kHz (8/16/24/32 bits per sample)
    • DSD Native: DSD64 (1-bit/2.8MHz), Stereo / DSD128 (1-bit/5.6MHz) Stereo / DSD256 (1-bit 11.2MHz), Stereo

USB DAC Mode: The USB DAC function lets you connect the SR25 for use as a sound card for your computer for better sound quality, compared to the built-in sound card. Connect the unit via USB from your computer and listen to your stored digital music with headphones, powered speakers, or on your home stereo. The USB DAC is compatible with 32- and 64-bit versions of Windows 7, Windows 8, and Windows 10, and Mac OS X 10.7 (Lion) or later. In USB DAC mode, the device supports PCM 8-394kHz (8/16/24-bit) and DSD (2.8/5.6/11.2 MHz). Volume is controlled via the SR25's volume wheel. You may need to install a dedicated driver (available on Astell&Kern's website) to use the SR25 as a USB DAC.

Balanced/Unbalanced Outputs: The Astell&Kern SR25 offers both balanced and unbalanced outputs on the top of the device. Balanced outputs have an additional "cold" signal to compliment the hot signal, which reduces external noise and increases output. The balanced output is a 4-pole 2.5mm port. You can also connect an external audio device to the SR25 by connecting to both the earphones port (ground) and the balanced port (LR), using an optional balanced cable available from Astell&Kern. Output voltages: Balanced 4.0V, Unbalanced 2.0V (no load).

User Interface: The SR25 features a high-quality user interface to make it easy to find and select your music files, change the volume, and adjust the sound:

  • 3.6" LCD Touchscreen: The full-color 3.6" LCD touchscreen has a resolution of 720 x 1280 pixels. The screen displays the title and artist of the currently playing song, along with elapsed and remaining time, with the album art in the background. On the touchscreen, you can touch the Play/Pause, Previous/Rewind, or Next/Fast Forward icons to control playback. You can make adjustments to the EQ, set the repeat and random modes, and add the song to a playlist, all using the touchscreen interface.
  • Rotary Volume Knob: The SR25 has a side-mounted analog-style rotary volume knob. As you adjust the volume, you can feel and hear the detents in the rotary knob, and view the volume range numerically and graphically on the display (0 to 150). In the menu, you can change the output to "Line Out", which locks the volume level at maximum.
  • Hardware Control Buttons: There are four physical buttons on the unit: a top-mounted power button, along with side-mounted Play/Pause, Previous/Rewind, and Next/Fast Forward buttons. The power button turns off the screen with a short press, and turns the power on/off with a longer press.

Equalizer: The SR25's built-in 20-band equalizer that lets you adjust each band ±5.0dB in 0.1dB increments. In the advanced settings, you can adjust the bandwidth (Q) from 2.0 (wide) to 4.0 (narrow). You can save up to 20 User EQ curves.

Gapless Playback: Gapless Playback allows you to play one song after another without interruption. This is only supported when playing music files with identical bit rates, sample rates, and channels.

USB-C: The SR25 has a USB Type-C port on the bottom of the unit for connecting the unit to your computer for computer data transfer and for charging the battery. A Type-C to Type-C is recommended when connecting to a Mac that supports USB Type-C.

Wi-Fi Capability: The SR25 features built-in Wi-Fi (802.11 b/g/n--2.4GHz), allowing you to connect the device and your computer to the same network for streaming and downloading music. The device must also be connected to Wi-Fi to search the Gracenote database. With the MQS Streaming Server software installed on your PC or Mac, you can use the SR25 to access music files stored on your computer's hard drive or a connected HDD. In addition, the Wi-Fi connection allows you to receive notifications of new available firmware updates (OTA Upgrades), allowing you to download them on the spot.

Bluetooth: The SR25 also has built-in Bluetooth V4.2 with LDAC, AVRCP, A2DP and aptX HD profiles for connecting a Bluetooth device to listen to music wirelessly. The LDAC codec gives you more options for higher quality wireless audio. To pair the device, you must place the unit within 8" of the Bluetooth device. The connection and audio quality will degrade at longer distances, and may disconnect at distances of 6-1/2 feet or more.

AK Connect 2.0: The SR25 can stream or download music files stored on a computer on the same network. Using the AK Connect 2.0 app (available for Apple devices running iOS 8.0 or later or Android devices running version 4.2 and up), you can connect to a NAS or PC and control it with a smartphone or tablet. The app is compatible with DLNA and UPnP. (Streaming music from services such as TIDAL will be available soon.)

Power Requirements: The SR25 is equipped with a 3150 mAh 3.7V Lithium-Polymer battery. The battery charges via USB in about 2.5 hours via the included USB Type-C cable (5V-2A USB adapter). A fully charged battery can provide up to approximately 21 hours of continuous playback time (based on FLAC, 16-bit, 44.1kHz, unbalanced output, volume 50, EQ off, LCD off). The Auto Power Off feature helps save battery life by turning off the device if there's no user input for a defined period (10 minutes to 24 hours). A sleep timer (10 minutes to 5 hours) and screen timeout (10 seconds to 3 minutes) are also available.

Protective Film: The unit includes a protective film to keep the touchscreen and the rear glass panel scratch-free.


  • Frequency Response:
    • 20Hz-20kHz (±0.014dB Unbalanced, ±0.011dB Balanced)
    • 20Hz-70kHz (±0.10dB Unbalanced, ±0.12dB Balanced)
  • Signal-to-Noise Ratio (@1kHz): 122dB (unbalanced); 123dB (balanced)
  • Crosstalk (@1kHz): 138dB unbalanced, 144dB balanced
  • THD+N (@1kHz): 0.0007% unbalanced, 0.0008% balanced
  • Clock Jitter: 25ps

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Customer Q&A

4 questions already asked

I am not very tech savvy but need something I can transfer all of my cd's into. Can this device easily accommodate cd's?
[ Ali  Nov 14, 2021 ]
11 answers
I bought the Astell-Kern AK CD Ripper MK II, if they are in your computer I would update the CD sound file using a CD ripper though you could transfer directly
[ JAMES W  Nov 15, 2021 ]
Yes you can copy the CDs to your computer and the load them on to the device. You'll just need a computer with a CD/DVD drive or a separate CD read/write drive connected to the computer to copy the CDs.
[ Buddy  Nov 15, 2021 ]
I am not very tech savvy but need something I can transfer all of my cd's into. Can this device easily accommodate cd's? 'Easily' is the operative word. The process I used: 'Rip' (convert) the CD music tracks into a file format that can be copied onto the portable music player. I used dbPowerAmp software on a Windows PC to rip the tracks into .flac (lossless) files. You can covert into other formats as well, e.g., .mp3 (lossy) files. Copy the files onto the music player using the device USB interface I purchased Asell & Kern music player because of it's storage capacity and the ability to play .flac (lossless) music files. Ultimately, I returned the music player as its ability to create playlists of artists, tracks, etc. was too cumbersome for me. I use playlists extensively. I hope this helps.
[ S.E.  Nov 15, 2021 ]
You have to convert your CDs to sound files which can be done on a computer with a good cd drive and software such as dbAmp. Then it will hold hundreds of cds, mine has 650 with plenty of space left, if you don't want to do the conversion yourself there are services online where you shop the Cds and they convert. Hope that helps
[ Francis  Nov 15, 2021 ]
With the correct software, like Jriver media or something like that you can put cd's or any digital format you want in it.
[ bruce  Nov 15, 2021 ]
DISCLAIMER: I had one of these but sold it in favor of a different device. The answer to that's a bit complicated. AFAIK you can't directly rip CDs to the player. Rather you need to rip them to your computer, and then copy the files from your computer to the player. If you're on a Windows machine, you may want to look into an app called MediaMonkey. I use it to organize my ripped CDs and then sync them to my music player.
[ Andrew  Nov 15, 2021 ]
If you want to make it really easy get their cd ripper and it will be a piece of cake. The price of the ripper may put you off, but I've been using it exclusively and it's been well worth the money.
[ LLOYD  Nov 15, 2021 ]
If your music is on your computer you can easily transfer them. Thanks!
[ Charles  Nov 15, 2021 ]
If you rip your CD's to WAV or FLAC files and copy them on a SD card, then this device will store them nicely.
[ NANCY  Nov 15, 2021 ]
Copy the CD's to your computer then pick the ones you want to put on it.I picked just the songs I wanted and put them on mine.Hope this helps you
[ Paul  Nov 14, 2021 ]
You don't say how many CDs and if you already have them in digital format. If you haven't already ripped (Converted them to digital format), you can rip them using a computer with a CD Drive and some software. If you don't want to involve a computer you can do it right on the device but you would have to also purchase this; Depending on how many CDs you would also have to purchase a micro SD card to have enough memory to house all of the digital files.
[ Steven  Nov 14, 2021 ]
Would this connect to my integrated amp (Rotel) via front USB for playback ? Because the indication is for Bluetooth to work the device needs to be within inches of the other unit.
[ G Man  Jul 22, 2020 ]
3 answers
I use the line out jack into various amps with success and no issues. I've also used Bluetooth playback from AK player to amps without actual BT reception with Audio Engine device from Crutchfield and sound is very good.
[ Herb  Nov 25, 2020 ]
I'm not too sure, I haven't tried it with my home av reciever yet. Mine always had issues with the usb for my car stereo, I researched online and found out the usb cable that comes with it is only to charge and transfer music files from a computer.
[ Tyrone  Jul 24, 2020 ]
It should, but you would probably get a better sound quality by using the players line output so that you would be using the Dacs built in the player, unless your amp has really high quality dacs built in...
[ bruce  Jul 24, 2020 ]
How hard is it to replace the battery? One of my pet peeves
[ Thomas  Feb 14, 2021 ]
3 answers
I never thought about changing the original battery. Looking at it, it is all sealed with no indications that users could change it. I personally would not try and if it really needs it, I would sending back for service.
[ JEAN  Feb 14, 2021 ]
Have used player for a couple weeks now-- played mp3s non-stop for 6 hrs from 100% charge and it power level only dropped to 76%! Unit looks sealed up pretty tight, I don't think battery is normally user-serviceable like older cell phones etc. I chose this over the newer higher-end Sony products based on battery life issues and it has lived up to review claims so far!
[ Frank  Feb 14, 2021 ]
I've only had mine for about 8 months.... so I haven't needed to know yet. Having said that, have you talked with A & K directly. Their website seems to be very user friendly. Good Luck ....
[ Steven  Feb 14, 2021 ]
will this unit play audible books?
[ David  Dec 19, 2020 ]
1 answer
I have not tried it but I assume it will play any any audio file whether it's music or an audio book.
[ J  Dec 19, 2020 ]

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