AK Jr - Mp3 player Astell&Kern - Free user manual and instructions
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| Product Type | Portable High-Resolution Audio Player |
| Brand | Astell&Kern |
| Model | AK Jr |
| Display | 3.31-inch WVGA (480x800) Touchscreen |
| Internal Memory | 64 GB (microSD slot for expansion up to 128 GB) |
| Supported Audio Formats | WAV, FLAC, ALAC, AIFF, DSD (DSF/DFF), MP3, WMA, OGG, APE |
| Max Sampling Rate | 192 kHz / 24-bit (WAV, FLAC); DSD128 native |
| Audio Output | 3.5mm unbalanced, 2.5mm balanced |
| Bluetooth | Bluetooth 4.0 (A2DP, AVRCP, aptX, AAC) |
| Battery | Built-in rechargeable Li-ion (1450 mAh) |
| Battery Life | Approx. 10 hours of continuous playback |
| Charging | Micro USB 2.0 (5V / 1A) |
| Dimensions | 55.4 x 92.1 x 14.0 mm |
| Weight | 110 g |
| Operating System | Embedded Linux (proprietary) |
| User Interface | Touch + physical buttons (play/pause, volume, track) |
| Accessories Included | Micro USB cable, quick start guide, screen protector |
| Maintenance & Cleaning | Wipe with a soft dry cloth. Do not use liquids or abrasives. |
| Safety Information | Do not expose to extreme temperatures or moisture. Use only approved chargers. |
| Repairability & Spare Parts | Battery replacement by authorized service center only. No user-serviceable parts. |
Frequently Asked Questions - AK Jr Astell&Kern
How do I transfer music to the AK Jr?
Connect the device to your computer via the included micro USB cable. It will appear as a mass storage device. Drag and drop audio files (MP3, FLAC, etc.) into the MUSIC folder. Eject safely before disconnecting.
What is the maximum microSD card size supported?
The AK Jr supports microSD cards up to 128 GB. To use a card, insert it with the gold contacts facing down until it clicks. Format the card to FAT32 or exFAT before use.
How long does the battery last?
The battery lasts approximately 10 hours of continuous playback, depending on volume, file format, and use of Bluetooth or screen. Full charge takes about 3-4 hours via a standard 1A USB charger.
What audio formats are supported?
The AK Jr supports lossless formats such as FLAC, WAV, ALAC, AIFF up to 192kHz/24-bit, as well as DSD64 and DSD128. It also plays compressed formats like MP3, WMA, OGG, and APE.
Can I use the AK Jr as a USB DAC?
No, the AK Jr does not support USB DAC mode. It is designed as a standalone portable player. It cannot be used as an external sound card for a computer or phone.
What is the difference between the 3.5mm and 2.5mm outputs?
The 3.5mm output is standard unbalanced, while the 2.5mm output is balanced. Balanced output provides better channel separation, lower noise, and higher power output, ideal for high-impedance headphones.
Does the AK Jr have Wi-Fi?
No, the AK Jr does not have Wi-Fi. It relies on wired music transfer via USB or Bluetooth streaming from a paired device. There is no internet connectivity or streaming apps.
How do I reset the device if it freezes?
Press and hold the Power button for about 10 seconds until the screen turns off, then release. Wait a few seconds and press the Power button again to restart. This does not erase any data.
Can I use Bluetooth headphones with the AK Jr?
Yes, the AK Jr supports Bluetooth 4.0 with codecs SBC, AAC, and aptX. Go to Settings > Bluetooth, pair your headphones, and enjoy wireless playback.
How to update the firmware?
Download the latest firmware from the Astell&Kern support site. Copy the update file (e.g., update.bin) to the root of a microSD card. With the device off, insert the card, then hold the Volume Up button and press Power to enter update mode. Follow on-screen instructions.
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