HUD100 MK2
HUD100 MK2
HUD100 MK2
HUD100 MK2
HUD100 MK2
HUD100 MK2
HUD100 MK2
HUD100 MK2
HUD100 MK2
HUD100 MK2

HUD100 MK2

Regular price $139.99 Sale price $111.99
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  • Compact, yet high-performance / Plays up to PCM 32bit/384kHz and DSD128 / 45 x 32 x 8mm / 21.5g / USB Type C
  • Jitter-Resilient / The first audio DAC to adopt ARM Cortex processor and MEMS oscillator to implement Radsone's proprietary algorithm and minimize jitter
  • 2 Power x 3 Sound Processing Modes / 1.29Vp Standard, 3.20Vp High Power Output
  • Bypass processing mode for pure sound enthusiasts / DCT processing mode for users searching for well-dithered analog-like sound / Radsone-tuned Dynamic processing mode for more powerful sound with balance
  • Elaborate 8 layer circuit design to bring the best performance out from such a small size


    • LED light should be on when properly connected
    • USB hub might not recognize HUD100. Please connect it directly to your PC
    • DCT and Dynamic modes currently work on only PCM 44.1kHz

    White Paper


    USB Driver for Windows


    *Please install the driver to play up to PCM 32bit 384kHz, DSD64/128 audio on Windows.
    *Windows 7 users must download the driver.

    Device Firmware Updater

      Mac  Win_x64 (64bit)Win_x86 (32bit)

    Version 1.10 (June 3, 2020) : Fixed intermittent noise issue during audio playback on some music players from Samsung Galaxy S10 & Note 10
    Version 1.02 (April 17, 2020) : Fixed 'No Sound’ issue with certain low-spec Windows 10 PCs

    Version 1.01 (April 06, 2020) : Fixed the low volume issue on Android smartphones.
    Changed the default volume from -20dB to -3.5dB)​

    * Caution: -3.5dB can be too loud for some people so please be careful not to damage your ear when turning the music on.
    * The DFU program doesn't work on Mac OS Catalina (10.15.0) due to its notarization process. It will be able to work after June, 2020
    * Please refer to the manual p10-p11 to set up
    * Just download the updater once. When there’s a new firmware update, it will be automatically applied to the updater.

    Customer Support

    For technical support, please email to We reply to customer inquires within 2 business days. For other questions including business proposals, please use the Contact page.

    Warranty Conditions

    1. Radsone warrants EarStudio products for 30 days from the date of purchase against manufacturing defects. In this case, we offer an exchange with an equivalent new product for free. This warranty does not apply to damages caused by accident, abuse, misuse, or modification of the products.

    2. Radsone warrants EarStudio products for 2 year from the date of purchase against the damages caused by customers. In this case, the product will be repaired or exchanged with a refurbished product at the customer's expense.