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Astell&Kern

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The evolution continues, AK320

  • AK4490
    Dual DAC
  • DSD-to-PCM
    play
  • Parametric EQ
  • 200fs VCXO
    Reference Clock
  • AK Connect
    App
  • Metal Touch
    Sensor
    Home button
  • Metal Body
    (Aluminum)
  • AMP
    (Compatible)
  • Cradle
    (Compatible)
  • CD-RIPPER
    (Support)

Inheriting Sound

The primary goal of Astell&Kern has always been to deliver the original sound, and we believed that the AK380 did just that. We wanted even more people to experience the AK320 and its ability to deliver the original sound as intended.

AK4490’s Dual-DAC, DSD-to-PCM Playback, Parametric EQ with 20bands 0.01dB, 200 Femto Second VCXO Reference Clock,
Exceptional Expandability, DLNA-based AK Connect App and Metal Touch Sensor Home Button

AK320 vs. AK380

AK320 vs. AK380
  AK320 AK380
PCM 24bit 192kHz Bit to Bit 32bit 384kHz Bit to Bit
DSD DSD to PCM Native DSD Playback
DSD64/128 → PCM 24bit 176kHz DSD 2.8MHz (DSD 64) / DSD 5.6MHz (DSD 128) / DSD 11.2MHz (DSD 256)
DAC AK4490 x2 (Dual DAC) AK4490 x2 (Dual DAC)
PEQ Support Support
Femto Clock Support Support
UAC DAC Max 24bit 96kHz (UAC 1.0) Max 32bit 384kHz / DSD 11.2MHz (UAC 2.0)
Built-in Memory 128GB 256GB

24bit 192kHz bit to bit Playback

AK320 is capable of bit-to-bit playback up to 24bit, 192kHz.
32bit audio is downsampled using a sample-rate converter (SRC). In addition, DSD 64/128 can be played back via conversion to PCM.

* 32bit, 384kHz is downsampled to 24bit, 192kHz, and 32bit, 352kHz is downsampled to 24bit, 176kHz for playback.
* DSD 64/128 is converted via DSD-to-PCM to PCM 24bit, 176kHz for playback.

32bit SRC
by
the AK320
32-bit MQS
32-bit
Delivery
CPU
Conversion
to 24bit
24bit
Delivery
DAC
 
 
DSD-to-PCM
Conversion
by the AK320
DSD 64/128
DSD
Delivery
CPU
DSD-to-PCM
Conversion
PCM
Delivery
DAC
 
 

PEQ (Parametric EQ)

A parametric equalizer (PEQ*1) was implemented in the AK320 to deliver detailed adjustment of the original sound, and an audio digital signal processor (DSP) was added to aid in this process.

This frees up CPU cycles previously needed for calculating graphic equalizers (GEQ), allowing more detailed and accurate calculations via the dedicated DSP.

The audio DSP expands the existing 10-band, ±0.5 dB graphic equalizer (GEQ*2) to 20-band, ±0.01 dB to more precisely adjust the frequency and gain (dB) as well as more accurately specifying the frequency range via Q value adjustments.

* The PEQ supports up to 8 kHz - 192 kHz (8/16/24-bit) formats, but DSD and 32-bit audio are not supported.

The AK320’s
PEQ Playback
Using Audio DSP
PCM Sound
Source
Up to 24bit,
192kHz
CPU
 
Audio DSP
Freq./dB Value
Processing
 
32-bit
DAC
 
 
The other Products
GEQ Playback
Using Audio DSP
PCM Sound
Source
PCM
Delivery
CPU
Freq./dB Value
Processing
 
24-bit
DAC
 
 
AK320 20-band PEQ and AK120 Ⅱ 10-band GEQ Frequency Values
20-Band PEQ 10-Band GEQ
30Hz
45Hz
60Hz
90Hz
120Hz
180Hz
250Hz
380Hz
500Hz
750Hz
1kHz
1.5kHz
2kHz
3kHz
4kHz
6kHz
8kHz
12kHz
14kHz
18kHz
30Hz
60Hz
120Hz
250Hz
500Hz
1kHz
2kHz
4kHz
8kHz
16kHz

What is Parametric Equalization (PEQ*1)?

Parametric equalization refers to the ability to increase or decrease the volume within the Q value range.
A Q value is a frequency range relative to a selected frequency. The frequency range decreases when the Q value increases and vice versa.

Selected Frequency

Existing EQ value of the
Selected Frequency

Q value setting

Increase the Q value of the
Selected Frequency

Q value setting

Decrease the Q value of the
Selective Frequency

What is Graphic Equalization (GEQ*2)?

Graphic equalization divides the audible frequency register into several registers and increases or decreases the level of each register with a volume slider to adjust the respective frequency’s characteristics.
The switches of the volume slider are connected like a graph to visually determine the frequency characteristics, hence the name ”graphic equalizer.”

AK120 GEQ
AK320 PEQ

Frequency

Gain (-5.0 ~ +5.0) 0.01dB

Q (0.1 ~ 4.0) 0.1dB

Equipped With a Femto Clock to
Deliver True Original Sound

Astell&Kern implemented a voltage-controlled crystal oscillator (VCXO) high-precision clock with a reference jitter value of 200 femto seconds*3. Femto clocks are commonly used in high-end audio systems, and the clock is measured in high-precision femtosecond units(one quadrillionth of a second).

What is VCXO?

A VCXO, or a voltage-controlled crystal oscillator, is a type of crystal oscillation device that creates oscillation frequencies.
External environmental stimuli, which in this case mean voltage inputs, influence the frequency value. Adjustments to the voltage input tunes a precise frequency value.

What is Jitter?

Jitter refers to the undesired deviation in time that occurs in a periodic signal.
In this case, jitter is the error that occurs in the reference clock required to perform the sampling in digital audio equipment.

By utilizing a femto clock, the AK320 is able to create a more accurate frequency value and make fine jitter corrections. As a result, the AK320 faithfully reproduces analog sound closer than ever to the original source when transmitting a digital signal as an analog signal.

1fs (Femto Second)*3

1 1

1015 1,000 trillion

==sec.

1ps (Pico Second)

1 1

1012 1 trillion

==sec.

1ns (Nano Second)

11

109 1 Billion

==sec.

AK320 Clock Jitter
Original Clock Jitter Embedded
Clocks the AK320
Clock Jitter
Original Clock Jitter Embedded
Clocks

USB DAC

The AK320 supports USB DAC functionality.

The AK320 can be connected to a PC or Mac via USB for use as a USB DAC that supports PCM/DSD. When playing back music stored on a PC or Mac, the Dual-DAC is able to deliver richer audio of outstanding soundstage and resolution well beyond the limits of a built-in sound card.

* When using the AK320 as a USB DAC, its PEQ settings are not applied, and output up to 24bit, 96kHz is supported.
* DSD 64/128 is converted via DSD-to-PCM for playback.

PC / MAC

Headphone

Speaker

Car

PCM USB

Line Out

The AK Connect and AK Connect HD apps Download

The AK Connect and AK Connect HD apps are available for download from the Google Play Store and the Apple App Store.

[Phone] AK Connect

[Tablet] AK Connect HD

Pressure-sensitive
Metal Capacitive Touch

The AK320 features the same metal touch
interface as the AK380.

The Metal Touch functions as a home key
and interfaces with the device via
pressure-sensitive touches.

More Expandable Options

The AK320 can be expanded to a variety of devices through the micro-USB and balanced audio out ports located at the bottom of the product.

It can be connected with the AMP as well as professional high-impedance headphones for high output and USB for data transfer and charging. It can also be connected to the Cradle for balanced audio functionality as well as the CD-RIPPER to conveniently rip audio CDs.

The AK320's First Accessory

AMP

The AK320's Bedrock

Cradle

Perfect Extractor

CD-RIPPER