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Astell & Kern SR25: The next A&norma player
Oct 3, 2023 at 9:22 AM Post #2,686 of 2,746
Pepper606 said:
Just a thought: Lithium batteries can suffer from swelling which obviously isn't good.
I've always followed a practice of not fully charging a Lithium battery as its my belief that over charging is the root cause.
My background is in engineering, specially DC power systems with a heavy emphasis in battery technology.
I can state my personal experience in that I've never had any battery fail since I started following this practice.
I can state that in the industry I work in, swelling is an issue and Lithium batteries fail.

Please take into account that there are different battery types, even Lithium. So I have to generalise.
The advantages outweigh the negatives. But maybe look at whether you can alter the way you charge? Stop before you get to 100% and you might end the terrible luck you are having!
Click to expand...
All the words above I now live by. I used to leave my SR25 plugged in ALL THE TIME to the port of my MacBook, as I was often loading and unloading music onto it.
That is, until the shocking day, that the battery bulged, compromised the glue and pushed the back plate out, and I had to return the player that was just barely still in the warranty period!
Never again do I “just plug in” the player(s) I own from A&K. I try and not bring them to 100% charge, either. If the player happens to drain and power down during a listening session, then so be it!
 
Oct 9, 2023 at 6:05 PM Post #2,687 of 2,746


Thinking of upgrading to the SR35? You're invited to read my full review this terrific little player here. :ksc75smile:
 
Oct 19, 2023 at 5:15 AM Post #2,688 of 2,746
If someone in EU is considering upgrading to SR35, check out my classifieds listing :).
 
Oct 31, 2023 at 7:48 AM Post #2,689 of 2,746
I wonder if it would be possible to install Hiby Music (via Apk) on the SR35 and if then I will be able to play Sacd iso files?
 
Nov 1, 2023 at 8:26 AM Post #2,691 of 2,746
I'm trialling an alternative solution, I've bought a decent power bank which (from the data I've been able to find) has a rather decent trickle charge.
It's description of being designed for sensitive IEMs caught my attention.
I've had it for a week and have used only this to charge the LiPo equipment I use. Obviously I cannot state that it will solve the issue, time is going to decide.
But I am confident the route this manufacturer went is the same as that implemented on equipment I have previously been involved with.
 
Nov 24, 2023 at 4:39 PM Post #2,694 of 2,746
wangch said:
Would it be worth purchasing a A&K Sr25ii if I get a great deal?thanks for opinion
Click to expand...
I don't have the SR25II, and I've never listened to one, but I do have the original SR25 and it is all I need. It sounds great with the music I have loaded on to a microSD card, and it streams well over wifi. At this time, I'll keep listening to it until it gives up the ghost. No need for the latest iteration.
 
Nov 24, 2023 at 5:23 PM Post #2,695 of 2,746
tbrobison said:
I don't have the SR25II, and I've never listened to one, but I do have the original SR25 and it is all I need. It sounds great with the music I have loaded on to a microSD card, and it streams well over wifi. At this time, I'll keep listening to it until it gives up the ghost. No need for the latest iteration.
Click to expand...
yeah, I'm still pretty happy with my OG SR25. Works great as a simple source for less-demanding IEMs, disappears in my pocket and the battery still seems to last forever.
wangch said:
Would it be worth purchasing a A&K Sr25ii if I get a great deal?thanks for opinion
Click to expand...
Probably, although it would have to be like half the price of SR35. One consideration would be that the older models have the previous firmware version based on an older version of Android, so the newer ones like SR35 with A&K's newer firmware will likely get app updates for longer.
 
Nov 25, 2023 at 3:28 AM Post #2,696 of 2,746
The SR25 mkii is a great DAP. Its performance really does justify the price, so if you can get a deal you should definitely go for it.
I also have the SE300, which I don't carry around outside. Too big and too valuable! My point is the SR25 mkii isn't a huge step down.
I had expected to retire it, but just keep using it everyday. One of the best things I've ever bought.
 
Nov 25, 2023 at 12:36 PM Post #2,697 of 2,746
Neweymatt said:
yeah, I'm still pretty happy with my OG SR25. Works great as a simple source for less-demanding IEMs, disappears in my pocket and the battery still seems to last forever.

Probably, although it would have to be like half the price of SR35. One consideration would be that the older models have the previous firmware version based on an older version of Android, so the newer ones like SR35 with A&K's newer firmware will likely get app updates for longer.
Click to expand...

They all use Android 9 but SR35 has new interface...
 
Nov 25, 2023 at 3:24 PM Post #2,698 of 2,746
Nov 26, 2023 at 2:39 PM Post #2,699 of 2,746
Neweymatt said:
Really? @JasonNYC seems to indicate here that the SR35 firmware is based on Android 11
https://www.head-fi.org/threads/astell-kern-launches-new-a-norma-sr35-player.967670/post-17696821

And the SR25 uses Android 9.0, as per A&K own site:
https://www.astellnkern.com/product/product_detail.jsp?productNo=6
Click to expand...

Booting to recovery and other various hacking shows Android 9. Not sure why they said 11. Here is build.prop for SR35, it's clearly Android 9:

Code: 
# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=PQ3B.190605.006
ro.build.display.id=PQ3B.190605.006 release-keys
ro.build.version.incremental=1040
ro.build.version.sdk=28
ro.build.version.preview_sdk=0
ro.build.version.codename=REL
ro.build.version.all_codenames=REL
ro.build.version.release=9
ro.build.version.security_patch=2019-07-05
ro.build.version.base_os=
ro.build.version.min_supported_target_sdk=17
ro.build.date=Tue Jun 13 11:52:57 KST 2023
ro.build.date.utc=1686624777
ro.build.type=user
ro.build.user=builder
ro.build.host=6d5967021142
ro.build.tags=release-keys
ro.build.flavor=rk3326_mid-user
ro.build.system_root_image=true
ro.product.model=SR35
ro.product.brand=AstellnKern
ro.product.name=rk3326_mid
ro.product.device=rk3326_mid
# ro.product.cpu.abi and ro.product.cpu.abi2 are obsolete,
# use ro.product.cpu.abilist instead.
ro.product.cpu.abi=arm64-v8a
ro.product.cpu.abilist=arm64-v8a,armeabi-v7a,armeabi
ro.product.cpu.abilist32=armeabi-v7a,armeabi
ro.product.cpu.abilist64=arm64-v8a
ro.product.manufacturer=Dreamus Company
ro.product.locale=en-US
ro.wifi.channels=
# ro.build.product is obsolete; use ro.product.device
ro.build.product=rk3326_mid
# Do not try to parse description, fingerprint, or thumbprint
ro.build.description=rk3326_mid-user 9 PQ3B.190605.006 1040 release-keys
ro.build.fingerprint=AstellnKern/rk3326_mid/rk3326_mid:9/PQ3B.190605.006/1040:user/release-keys
ro.build.characteristics=tablet
# end build properties

#
# ADDITIONAL_BUILD_PROPERTIES
#
ro.treble.enabled=true
persist.sys.dalvik.vm.lib.2=libart.so
dalvik.vm.isa.arm64.variant=cortex-a53
dalvik.vm.isa.arm64.features=default
dalvik.vm.isa.arm.variant=cortex-a7
dalvik.vm.isa.arm.features=default
net.bt.name=Android
dalvik.vm.stack-trace-dir=/data/anr
ro.expect.recovery_id=0xc074992d699da1373d1a98ad63a29d4217383d33000000000000000000000000
 
Last edited:
Nov 27, 2023 at 7:58 PM Post #2,700 of 2,746
sr25mkii.JPG
 
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