Craft Your Sound

PD20

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Craft Your Sound

Finding the sound that truly suits you is the first step toward the essence of music. PD20 is designed to guide you on that journey.
Our first step in this journey was to start from the very beginning. Rather than creating a successor to the PD10, we created an entirely new audio device that will redefine your musical experience.

Through Personal Sound, you can create a sound signature tailored to your hearing, then precisely refine it to your taste using the Sound Master Wheel. An intuitive control that allows even the amplifier driving mode to be changed with a single touch. Now, music is not just something you listen to. It is something you shape.

  • The first DAP to support personalized sound through a hearing test
  • 160-step EQ control via the Sound Master Wheel
  • Triple AMP Class with real-time switching
  • Class A current control with High / Mid / Low modes
  • Proprietary ESA (Enhanced Signal Alignment) technology to minimize group delay
  • Advanced DAR

Exceptional resolution and high-purity sound, ES9027PRO Quad-DAC


Designed with a singular focus on sound quality, PD20 adopts the ESS ES9027PRO DAC in a Quad-DAC configuration.
Four DACs operate independently to minimize inter-channel interference and deliver precise signal separation. As a result, even the finest nuances in sound are revealed with greater clarity, creating a natural, analog-like presentation through clean, distortion-free layering.

Minimizing Group Delay with Proprietary ESA (Enhanced Signal Alignment) Technology

Through its in-house developed ESA (Enhanced Signal Alignment) technology, PD20 significantly improves one of the fundamental challenges in audio reproduction—group delay. ESA precisely aligns frequency signals so they arrive more uniformly, minimizing frequency distortion and enhancing clarity and cleanliness of sound.

(Left pic: ESA Not Applied) (Right pic: ESA Applied)

*What is Group Delay?
Group delay refers to the difference in time it takes for each frequency to pass through an internal audio system. In simple terms, it describes a phenomenon where different frequencies within an audio signal do not arrive simultaneously, resulting in slight timing delays across frequencies.

To create the ultimate DAP unlike anything experienced before, we went beyond simply adopting the latest DACs and new specifications. We further evolved and applied TERATON ALPHA, Astell&Kern’s Ultimate Sound Solution, incorporating its advanced and innovative audio technologies.

Refined through continuous research, TERATON ALPHA represents Astell&Kern’s integrated audio engineering expertise. Through effective power noise reduction, efficient power consumption with stable amplification, and a precisely engineered audio output interface, it delivers sound that remains faithful to the original source.

Triple AMP Architecture


PD20 features three distinct amplifier classes, allowing you to directly choose both sonic character and driving performance.

Class A mode delivers rich, high-density sound with minimal signal distortion, expressing a smooth, analog-like texture.
Class AB mode offers excellent balance and efficiency, providing stable dynamics and articulate detail.
Hybrid mode combines the refined texture of Class A with the efficiency and power of Class AB, creating a new level of sonic balance.

Switching between amplifier classes is achieved through a physical slide key rather than a software menu, enabling intuitive, immediate control based on your listening situation. Choose the amplifier class that best matches your music and listening environment.

Adjustable Class-A Current

High
Maximizes power delivery to create a wide soundstage and explosive dynamics. Even high-impedance headphones are driven with unwavering authority and a spacious, stable presentation.

Mid
Provides an optimal balance between sound density and resolution. It preserves vocal texture while delivering a well-balanced sound that remains comfortable even during extended listening sessions.

Low
Employs delicate, precise current control to suppress background noise and enhance sonic purity. Ideal for high-sensitivity IEMs, revealing even the finest nuances and micro-details.

*Current adjustment is available in Class A and Hybrid modes only.

A One-of-a-Kind Sound Tuned to Your Hearing



PD20 delivers optimal sound tailored to your individual hearing.
Developed in collaboration with global audio solution leader Audiodo, Personal Sound is used in a DAP for the first time, creating a personalized profile exclusively for you and redefining how you experience sound.

By precisely analyzing your hearing characteristics and independently compensating for left and right ears, it dramatically enhances clarity and balance. Regardless of genre, volume level, or the headphones or IEMs you use, you can enjoy a consistently optimized listening experience.

With a simple hearing test, your personal listening experience is complete.

* Dedicated earphones are included for accurate hearing measurement.
* Personal Sound supports audio playback up to 32bit / 192kHz.

Audiodo Audiosphere: Immersive Spatial Sound from Any Stereo Source



Audiosphere goes beyond conventional stereo, delivering a powerful sense of spatial immersion. It expands two-channel audio into a virtual three-dimensional sound field and offers four presets: Subtle, Balanced, Immersive, and Echoic.

From the expansive resonance of orchestral performances to the realism of video content, you can select the sound atmosphere that best suits your listening preference.

* Audiosphere supports audio playback up to 32bit / 96kHz.

Audiodo Equalizer: Effortless, Intuitive EQ Control



Audiodo’s Equalizer offers intuitive control centered on Bass, Mid, and Treble. Working in harmony with the Personal Sound profile, it operates on an already corrected sound foundation, ensuring stable and consistent performance.

With the Tilting function, you can naturally adjust the overall tonal balance toward either the low or high frequencies, while preserving the original sound character.

* Equalizer supports audio playback up to 32bit / 192kHz.

Sound Master Wheel, Crafting Your Own Sound in 160 Steps

The Sound Master Wheel, a key design element of the PD20, is seamlessly integrated with the Audiodo equalizer.
Each band—Bass, Mid, and Treble—can be finely adjusted across 160 steps, from –8.0 dB to +8.0 dB, allowing even the most subtle preferences to be precisely reflected in your sound.

Without interrupting your music, you can shape and refine the sound purely through the tactile feel of the wheel.

Bringing You Closer to the Original Sound, Advanced Digital Audio Remaster

Advanced DAR is a second-generation DAR technology designed to deliver a more natural and refined sound.
Rather than sending the audio signal directly to the DAR engine, the signal first passes through VSE (Virtual Sound Extender), where lost harmonics are virtually restored to enhance sound quality.
After this initial enhancement, DAR processing is applied in a second stage to achieve more complete and sophisticated upsampling. Through this process, listeners can experience a deeper, more immersive sound that remains faithful to the original recording.

(Lossy audio above 16kHz > Data restoration through VSE > DAR applied after data restoration)

Real-Time Information Visualized Through Light

The LED light surrounding the power button displays the bit depth information of the currently playing track, while also enhancing the button’s presence with a refined visual accent, adding an extra layer of enjoyment to the listening experience.



* The LED light can be turned on or off according to user settings.

Supports Native DSD512 and 32-bit / 768 kHz Playback



Powered by Astell&Kern’s proprietary technologies to deliver premium sound, PD20 supports Native DSD512 and playback of up to 32-bit / 768 kHz, allowing you to enjoy your music with exceptional fidelity and freedom.

ReplayGain for Consistent Volume Levels

ReplayGain automatically adjusts the playback volume, normalizing tracks with different loudness levels to a consistent volume. With ReplayGain, you can enjoy your personal playlists with a more balanced and comfortable listening experience.
* ReplayGain supports audio files up to 24-bit / 192 kHz.

 

CrossfeedA Speaker-Like Listening Experience Through Headphones

Crossfeed blends a portion of the opposite channel signal and applies a slight time delay before routing it to each channel, positioning the sound image toward the center. This creates a more natural, speaker-like listening experience and helps reduce listening fatigue. With detailed adjustments for Shelf Cutoff, Shelf Gain, and Mixer Level, users can fine-tune the settings to match their personal listening preferences.

 

Wireless Hi-Fi Sound via BT Sink

The BT Sink function allows PD20 to connect wirelessly to external devices via Bluetooth, similar to connecting a smartphone to a Bluetooth speaker. Music played on the external device is transmitted to PD20 through the BT Sink function, enabling high-quality wireless audio playback.

 

Supports USB PD 3.0 Fast Charging

With support for USB PD 3.0 fast charging, PD20 can be fully charged in approximately 4 hours.

 

Equipped with a 6-inch FHD+ display

Experience more convenient and comfortable use of PD20 with its expanded 6-inch Full HD display, offering a larger viewing area and enhanced image quality.

Specification

  • Model 
    PD20
  • Body Color 
    Silver
  • Body Material 
    Aluminum
  • Display 
    6inch 2160 x 1080 Touch screen
  • Supported Audio Formats 
    WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF
  • Sample rate 
    PCM : 8kHz ~ 768kHz (8/16/24/32bits per Sample)
    DSD Native: DSD64(1bit 2.8MHz), Stereo / DSD128(1bit 5.6MHz), Stereo
    DSD256(1bit 11.2MHz), Stereo / DSD512(1bit 22.4MHz), Stereo
  • Output Level 
    Unbalanced 5Vrms │ Balanced 10Vrms (Condition No Load)
  • CPU 
    Octa-Core
  • DAC 
    ESS ES9027PRO x4 (Quad-DAC)
  • Decoding 
    Support up to 32bit / 768kHz Bit to Bit playback
  • Input 
    USB Type-C input (for Charging & PC & MAC)
  • Outputs 
    Unbalanced Out (3.5mm), Optical Out(3.5mm)
    Balanced Out (4.4mm, only 5-pole supported)
  • Wi-Fi 
    802.11 a/b/g/n/ac (2.4/5GHz)
  • Bluetooth 
    V5.3 (A2DP, AVRCP, Qualcomm® aptX™ HD, LDAC, LHDC, SBC, AAC)
  • Dimensions 
    3.05” (77.5mm)[W] x 6.12” (155.7mm)[H] x 0.68” (17.3mm)[D]
  • Weight 
    about 11.04oz (313g)
  • Feature Enhancements 
    Firmware upgrade supported (OTA)
  • Operating Temperature 
    0℃ ~ + 40℃ (32℉~ 104℉)
  • Built-in Memory 
    256GB [NAND]
  • External Memory 
    microSD x1 (Max. 2TB)
  • Capacity 
    5,770mAh 3.8V Li-Polymer
  • Charge Time 
    about 4hours (PD3.0 Charging)
  • Playback Time 
    about 14hours (Standard : FLAC, 16bit, 44.1kHz, Vol.50, Class AB, LCD Off)
  • Supported OS 
    Windows 8,10,11(32/64bit) MAC OS X 10.7