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
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ES9027PRO
Quad-DAC -
Octa-Core
-
Personal
Sound -
Triple
AMP Class -
Sound Master
Wheel -
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.
[ ESA Not Applied ]
[ 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
In Class A and Hybrid modes, the amplifier current can be adjusted in three levels: High / Mid /
Low.
AMP Current adjustment goes beyond simple output control. It precisely fine-tunes the energy density and
driving behavior of the amplifier, allowing you to further refine sound quality according to the
characteristics of your earphones or headphones.
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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.
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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.
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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.
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.
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.
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.
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 ]
Sound Design Shaped by DAC Filters
Design your own sound style with seven DAC filters.
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Minimum phase (Default)
Low latency with minimized ringing and reduced ripple in the passband.
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Linear Phase Apodizing
Designed to prevent aliasing, this filter offers improved overall imaging and a
natural roll-off beyond the 20 kHz range.
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Linear Phase Fast Roll-Off
Delivers clean transient response and high resolution, particularly suitable for
music with strong transients. A widely used filter that provides a bright and clear
high-frequency range.
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Linear Phase Slow Roll-Off
Features low group delay and symmetrical impulse response with minimal ringing.
Compared to LPFR, it offers a gentler roll-off and a cleaner high-frequency presentation.
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Minimum Phase Fast Roll-Off
Minimizes pre-ringing, making it well suited for video and studio use. Free from
aliasing within the audible range, it delivers a more powerful low-frequency response and clean
highs compared to Linear Phase filters.
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Minimum Phase Slow Roll-Off
Eliminates symmetrical filtering to further reduce pre-ringing. Provides a
low-frequency range with strong extension and excellent transient response.
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Minimum Phase Slow Roll-Off Low Dispersion
Combines low latency of minimum phase filtering with reduced dispersion of linear
phase filters. Minimizes pre-ringing to achieve a well-balanced response and low dispersion
across the audio band.
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.
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16bit
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24bit
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32bit
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DSD
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 3.5 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.
DESIGN
Sound Lab Control
The design concept of the PD20 is “Sound Lab Control.” It offers an experience akin to working with
professional studio equipment—directly shaping, adjusting, and perfecting sound with precision.
The two wheels positioned on the top each serve a distinct purpose: one for sound tuning, the other for
volume control. Their symmetrical layout ensures intuitive operation, while the low-profile protectors
surrounding the wheels provide both protection and a sense of openness.
Top-mounted graphics and LED lighting allow you to instantly confirm the current mode without looking at the
screen. The AMP and CURRENT slide switches, along with the lock button, are individually positioned to
clearly define their functions, while the multifunction key is placed where the thumb naturally rests,
enhancing overall usability.
A linear, refined body combined with structurally aligned control elements. The clean design identity
pursued by the PD line reaches its fullest expression in the PD20.
Specification
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General Specifications
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Model
PD20
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Body Color
Silver
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Body Material
Aluminum
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Display
6inch 2160 x 1080 Touch screen
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Supported Audio Formats
WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF
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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)
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CPU
ESS ES9027PRO x4 (Quad-DAC)
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DAC
ESS ES9027PRO x4 (Quad-DAC)
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Decoding
Support up to 32bit / 768kHz Bit to Bit playback
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Input
USB Type-C input (for Charging & PC & MAC)
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Outputs
Unbalanced Out (3.5mm), Optical Out(3.5mm)
Balanced Out (4.4m, only 5-pole supported) -
Wi-Fi
802.11 a/b/g/n/ac (2.4/5GHz)
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Bluetooth
V5.3 (A2DP, AVRCP, Qualcomm® aptX™ HD, LDAC, LHDC, SBC, AAC)
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Dimensions
3.05” (77.5mm)[W] x 6.12” (155.7mm)[H] x 0.68” (17.3mm)[D]
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Weight
about 11.04oz (313g)
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Feature Enhancements
Firmware upgrade supported (OTA)
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Operating Temperature
0℃ ~ + 40℃ (32℉~ 104℉)
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Model
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Audio Specifications
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Frequency Response
±0.005dB (Condition : 20Hz~20kHz) Unbalanced │ ±0.010dB (Condition : 20Hz~20kHz) Balanced
±0.020dB (Condition : 20Hz~70kHz) Unbalanced │ ±0.020dB (Condition : 20Hz~70kHz) Balanced -
S/N
124dB @ 1kHz, Unbalanced │ 127dB @ 1kHz, Balanced
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Crosstalk
-133dB @ 1kHz, Unbalanced │ -140dB @ 1kHz, Balanced
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THD+N
0.0003% @ 1kHz, Unbalanced │ 0.0004% @ 1kHz, Balanced
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IMD SMPTE
0.0006% 800Hz 10kHz (4:1) Unbalanced │Balanced
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Output Impedance
Unbalanced Out 3.5mm (0.7ohm) │ Balanced Out 4.4mm(1.7ohm)
* Audio measurement specifications are based on AMP Class AB.
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Frequency Response
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Clock Source
-
Clock Jitter
25pS (Typ.)
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Reference Clock Jitter
250 Femto Seconds
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Clock Jitter
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Storage Capacity
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Built-in Memory
256GB [NAND]
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External Memory
microSD x1 (Max. 2TB)
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Built-in Memory
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Battery
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Capacity
5,770mAh 3.8V Li-Polymer
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Charge Time
about 4hours (PD3.0 Charging)
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Playback Time
about 14hours (Standard : FLAC, 16bit, 44.1kHz, Vol.50, Class AB, LCD Off)
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Capacity
-
Supported OS
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Supported OS
Windows 8,10,11(32/64bit) MAC OS X 10.7
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Supported OS
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Price
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$1800
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