Astell&Kern PD20 DAP Review: The Hi-Res Audio Player That Knows How You Hear
Read Time: Approx. 15 min.
TL;DR:
- The PD20 is the first portable player to build a personalized listening profile from a medical-grade hearing test and tune its output to your specific hearing characteristics
- A 160-step EQ, four Audiosphere spatial presets, and a dedicated Sound Master Wheel let you fine-tune your sound with tactile precision
- Triple Amp architecture with three amp current modes and three amp classes makes it compatible with virtually any headphone , IEM, or earbuds
- 256GB internal storage, 2TB microSD support, full Google Play Store, and 14 hours of battery life make it a capable daily driver for high-resolution portable audio
- At $1,970, the PD20 is the only DAP at this price that actively improves everything else in your setup
Astell&Kern's PD20 Is the First DAP Built Around Your Ears
Every audiophile I know has a wishlist. New headphones, a better amp, a different DAC–there's always something next. But here's what nobody in this hobby wants to admit: the gear isn't always the problem. We spend thousands chasing "perfect sound," but we're ignoring the most unpredictable piece of hardware in the entire chain: our ears.
Your ears are unique. The way you perceive bass, the way certain frequencies hit you–it's different for every listener. And yet every DAP on the market hands you the same fixed audio output and just expects you to love it. Well, that's easier said than done. The Astell&Kern PD20 is the first portable player that stops guessing what we want to hear and actually maps it. Using a medical-grade hearing test, the PD20 rebuilds the signal for your anatomy, bridging the gap between laboratory specs and real-world hearing.
PROS
- Personalized sound studio creates a hearing profile catered to your ears
- Intuitive, purpose-built physical controls
- Adapts to any headphones, IEMs, or earbuds with triple amp architecture
CONS
- Larger-sized DAP, not ideal for handheld use
- Counterclockwise volume wheel can feel counterintuitive to some users
Design
The PD20 is a flagship portable player from Astell&Kern, shaped like the PD10 DAP, but with an aluminum body, a 6-inch display, three VU meters, and several new physical controls. At 11.4 ounces, it's surprisingly light. Sure, it has some heft to it, but it's light enough that I can hold it in one hand, move my wrists around, and it doesn't feel like I'm holding a brick.
For everyday use, you're getting 256GB of internal storage, microSD support up to 2TB, and USB DAC functionality for Mac and PC. Running on Android, the PD20 offers full Google Play Store support means you can download virtually any app that's available natively, from Tidal, Qobuz, and Spotify, to Audible and ESPN. On standard playback settings, you're getting about 14 hours of battery life, and when it's time to charge, USB PD 3.0 fast charging tops it off in under 4 hours.
Now, when it comes to functionality, the PD20 is built by DAP users for DAP users. It's intuitive from the way it sits in your hand to the physical buttons adorning the unit. Every major function you'd want to reach quickly on this device has a physical home on the chassis. On the left side, you've got three dedicated switches: amp current, amp class, and control lock. You get real-time amp class switching between Class A, Class AB, and Hybrid modes. Within Class A and Hybrid modes, there are three current levels–high, mid, and low–that you can switch between depending on the headphones or IEMs/earphones you connect. And the control lock, well, that's an AK special. When enabled, it deactivates every physical button, knob, or switch on the PD20 so you don't have to worry about accidentally turning up the volume or skipping a track when holding the DAP in your hand.
On top of the DAP, you've got the sound master wheel, two headphone jacks–a single-ended 3.5mm and balanced 4.4mm–and the power volume wheel. The sound wheel is where all the PD20's magic lies, which I divulge in great detail in the sections below. Quick note on the volume wheel because there's a deliberate quirk here that many people aren't realizing. It's counterclockwise to increase the volume, which feels counterintuitive when you pick it up. BUT, the moment you set the device flat on a surface with the screen facing you, it makes perfect sense. Roll toward you to go louder. Roll away to go quieter.
It's designed for how most of us actually interact with these audio devices–whether it's an Astell&Kern product like the Kann Ultra DAP, SP3000T, SP3000M, or another in the lineup. For me, that was sitting at my desk working. I'd pick it up when I needed to move around, but most of the time it was just sitting flat next to me, and I never had to lift it to adjust the volume. Rounding out the physical controls, on the right sits a single playback button handling play/pause and track navigation through short presses. And the bottom houses a USB-C port and a microSD slot, supporting microSD cards up to 2TB. None of this requires you to unlock the screen or navigate the menu.
Sound
Astell&Kern didn't build a successor to the PD10 DAP. They've built something entirely different. A device centered around you. Your preferences. Your listening experience. And it all starts with the Sound Studio. Most DAPs give you a static sound signature and call it a day. They do the engineering, select the sound, and ship it. The Sound Studio completely flips that model. It's a fully integrated listening control center–a sound lab–that puts you in the driver's seat.
You've got Personal Sound–a hearing-test-based profile developed in partnership with Audiodo, a 160-step EQ across bass, mids, and highs, and Audiosphere spatial effects. All housed in one place, all accessible through a dedicated Sound Master Wheel on the top of the unit and the home screen.
Personal Sound works by running a 3-minute hearing test through the included earphones. A series of tones at varying frequencies is played for each ear, and you indicate whether you can hear each one. The PD20 then uses that data to build an individualized hearing profile, mapping characteristics ear by ear and compensating independently for each ear. We all have asymmetries in our ears that we've never considered, be it age-related hearing loss or just natural asymmetry, and the PD20 automatically accounts for them. I've been to an audiologist who informed me that my left ear isn't as strong as my right, and sure enough, the PD20 caught the same thing–a clear dip in the mids coming from my left ear. The PD20 is the first DAP to tune itself to the listener rather than requiring the listener to accept a fixed output.
From there, a 160-step EQ gives you surgical control over the low, mid, and high frequencies. The sound master wheel on top makes it tactile: short press to enter bass, mid, and treble adjustment. Turn the wheel to make those micro adjustments, or long-press the wheel to go into the full sound studio where the frequency response graph is displayed. You can either make those micro adjustments or use the slider in the sound studio to adjust all three frequencies at once. Save that EQ adjustment to your profile or reset it once the next track loads.
Then there's the audiosphere. Audiosphere works with spatial presentation, going beyond what typical EQ can achieve. There are four presets: subtle, balanced, immersive, and echoic. Subtle gently widens the soundstage without changing the character of the recording. Balanced smooths out the presentation for sessions where you just want something that flows. Immersive moves the center of the sound field outside your head, creating this fully enveloping experience that stays true to the original sound. And Echoic is the one that caught me off guard the most. It maximizes reverberation in a wide, concert hall-like space. The kind of reverb and space you'd get sitting in a club or arena. There are artists in my library I'll probably never see live, and with echoic running, I got as close as headphones have ever taken me. It ended up being my favorite spatial effect for artists like Rihanna, Charli XCX, and Frank Sinatra.
Echoic and immersive were the most genre-diverse effects. I had a harder time finding many tracks I enjoyed with balanced, but those crazy, demanding EDM tracks and certain classical compositions were wins. As for the overall sound of the PD20 without EQ adjustments or spatial effects enabled, it's natural and precise–a refined sound that has the hallmarks of an Astell&Kern DAP, but with this extra edge that's the sound studio. I spent the majority of my listening session using the new Meze Audio ASTRU IEMs and a few pairs of over-ear headphones. No drivability issues whatsoever, just pure sonic bliss.
Regardless of whether you're an analytical, detailed listener or a warm and musical fan, the PD20 caters to everyone and anyone. I'm the type of person who believes that if something is too good to be true, it's probably because it is. And well, for the first time, it's not. This is just as good–it's better–than you'd believe, and it's all true.
Woo
By Rihanna
(Anti)
The Way You Look Tonight
By Frank Sinatra
(Nothing But the Best: Frank Sinatra)
Club Classics
By Charli XCX
(Brat)
End of Summer
By Tame Impala
(Obsolete)
Features
- The first DAP to support personalized sound through a hearing test
- 160-step EQ control via the Sound Master Wheel
- ES9027PRO Quad-DAC
- 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 Technology
- 7 DAC Filters
- Supports native DSD512 and 32-bit/768kHz playback
- ReplayGain keeps playback levels consistent across tracks (automatically adjusts the playback volume, normalizing tracks with different loudness to a consistent volume)
- CrossfeedA speaker-like listening experience through headphones (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)
- Wireless hi-fi sound via BT Sink
Armed with the Sound Studio and an intuitive physical design, you might be thinking, "What else could the PD20 possibly have?" Well, I'm glad you've asked, because there's quite a bit.
Quad-DAC Architecture with Advanced Sound Alignment and Advanced DAR Technology
The PD20 runs on an ES9027PRO Quad-DAC configuration. Four DACs operate independently to eliminate inter-channel interference, delivering exceptional resolution and high-quality sound. That separation is what lets even the smallest nuances in a recording come through cleanly. Second-generation DAR Technology–Digital Audio Remaster–handles upsampling in two stages, restoring harmonics that typically get lost in digital playback and delivers something closer to analog in presentation. The PD20 also supports native DSD512 and 32-bit/768kHz playback at the maximum bit depth currently available, so if your library has high-resolution files, they're being handled properly, and your original recording is being honored at every level.
Enhanced Signal Alignment (ESA) Technology
ESA Technology–Astell&Kern's Enhanced Signal Alignment–significantly improves group delay, one of the fundamental challenges in audio reproduction. Group delay describes a phenomenon where different frequencies within an audio signal do not arrive simultaneously, resulting in slight timing delays across frequencies. ESA precisely aligns frequency signals so they arrive more uniformly, minimizing frequency distortion and enhancing the clarity and cleanliness of sound.
Triple Amp Architecture with Three Amp Current Modes
The PD20 features three distinct amplifier classes, allowing you to directly choose both the sonic character of your sound and the driving performance/amplification of your device. Class A delivers that rich, dense, analog-like texture. Low distortion and rich bass. Class AB brings efficiency and dynamic impact to the table, and Hybrid strikes a balance between both classes. You get the refined texture of Class A with the efficiency and power of Class AB.
Then, within Class A and Hybrid modes, there are three current levels. High for power-hungry, high-impedance headphones that need serious current to open up. Mid for balanced sessions with lower listening fatigue. And low for highly sensitive IEMs, where background noise is the enemy.
Amp Class Modes
Class A: Delivers rich, high-density sound with minimal signal distortion, expressing a smooth, analog-like texture.
Class AB: Offers excellent balance and efficiency, providing stable dynamics and articulate detail.
Class Hybrid: Combines the refined texture of Class A with the efficiency and power of Class AB, creating a new level of sonic balance
Amp Current Modes
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.
A few more features worth mentioning: ReplayGain automatically normalizes playback levels across tracks, so you're not constantly reaching for that volume wheel every time a new track loads. Crossfeed blends a portion of the opposite channel signal with a slight delay, simulating the experience of listening to speakers through headphones or IEMs. 7 DAC Filters for even more customization and BT Sink for wireless streaming via Bluetooth, meaning you can connect it to your smartphone or laptop and use it to elevate the audio output of those devices. Just like the A&ultima SP4000 DAP, the PD20 has full Google Play Store support, allowing you to download and enjoy any compatible apps.
Dragon Cables
There are a lot of reasons why you need to make sure your audio cables are not afterthoughts.
Our HiFi Audio Dragon Cables bring out more of what you love in your music and audio gear. If you love your headphones but wish they had a bit more top-end sparkle - a Silver Dragon Headphone Cable would be a great option. If your USB cables keep dying - as many stock cables do - then check out our quality USB Audio Cables. We say time and time again that materials matter, and our audio cables and custom geometries actually help to bring out those desired properties in your gear and music. We make tons of custom options for our customers so that you can get the right HiFi Audio cable for your exact needs. If you have any questions feel free to Contact Us and we'll be more than happy to help.
Verdict
The Astell&Kern PD20 DAP isn't trying to replace your favorite gear. It's bridging the gap of what your current gear can't do, because the missing piece has always been a device that actually knows how you hear, and gives you the tools to act on that. The PD20 is the first DAP to offer a hearing test-based sound profile, and it pairs that personalization with Quad-DAC engineering, triple AMP flexibility, and a physical control layout that was clearly designed by people who actually use this gear. At $1,970, you're not choosing between what it does and what it costs. You're just choosing whether you want it.
What makes the PD20 a genuine system upgrade rather than just another new release is what it does for the gear you already own. Don't have the budget to upgrade your headphones right now? The sound studio will compensate for that. Have analytical cans that fall flat on certain genres? Dial in the EQ on top of your hearing profile. Power-hungry headphones that have never been properly driven? Set the current to high and hear what they're actually capable of. Pair it with our Silver Dragon USB Cable for even greater performance, and use it as a USB DAC with your computer or laptop.
The PD20 doesn't sit alongside your collection as another purchase. It elevates the collection you already have. That's the real value of the PD20. The fact that this high-end device makes everything else you own better–and does it at under $2,000–makes the case for itself. In fact, it makes every other DAP at this price look like a compromise.
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What's in the Box
- PD20 Digital Audio Player
- Docking Cradle
- USB-C Charging Cable
- Warranty and Manual
- Leather Case (made with Synt3 eco-friendly polyurethane fabric)
Specifications
- Model: PD20
- Body Color: Silver
- Body Material: Aluminum
- Display: 6-inch 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 32-bit/768kHz Bit-to-Bit playback
- Input: USB Type-C input (for charging and PC and 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)
- Weight: about 11.04 oz (313g)
- Dimensions: 3.05" (77.5mm) W x 6.12" (155.7mm) H x 0.68" (17.3mm) D
- Feature Enhancements: Firmware upgrade supported (OTA)
- Operating Temperature: 0℃ ~ + 40℃ (32℉~ 104℉)
- 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: 124 dB at 1kHz Unbalanced | 127 dB at 1kHz Balanced
- THD+N: 0.0003% at 1kHz, Unbalanced | 0.0004% at 1kHz Balanced
- Crosstalk: -133 dB at 1kHz Unbalanced | -140 dB at 1kHz Balanced
- IMD SMPTE: 0.0006% 800Hz 10kHz (4:1) Unbalanced | Balanced
- Output Impedance: Unbalanced Out 3.5mm (0.7 ohm) | Balanced 4.4mm (1.7 ohm)
- Clock Jitter: 25pS (Typ.)
- Reference Clock Jitter: 250 Femto Seconds
- Built-in Memory: 256GB [NAND]
- External Memory: microSD x1 (Max 2TB)
- Battery Capacity: 5,770mAh 3.8V Li-Polymer
- Battery Charge Time: About 4 hours (PD3.0 charging)
- Playback Time: About 14 hours (Standard: FLAC, 16-bit, 44.1kHz, Vol. 50, Class AB, LCD Off)
- Supported OS: Windows 8, 10, 11 (32/64bit) MAC OS X 10.7
