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  • Aluminium as the primary raw material
  • AKM AK4490 dual DAC
  • Support up to 24bit/192kHz bit to bit decoding
  • Equipped with a femto clock
  • Parametric equalizer
  • Pressure-sensitive metal touch home button


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Product Details

Technical Features

The AK320 is 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 of 200 femto seconds. A VCXO is a type of crystal oscillation device that creates oscillation frequencies. External environmental stimuli, which in this case means voltage inputs, influence the frequency value. Adjustments to the voltage input tunes a precise frequency value. The jitter that happens in this case is the error that occurs in the reference clock required to perform the sampling in digital audio equipment. By utilising 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.

Formats Supported

Featuring a circuitry design and dual Digital Audio Converters (DACs), the AK320 is capable of bit-to-bit playback up to 24bit, 192kHz. 32bit audio is downsampled using a sample-rate converter (SRC). In addition, DSD64/128 can be played back via conversion to PCM. With approximately 10 hours of continuous playback on FLAC 44.1khz/16bit, and a total of 256GB of memory space, never run out of hours or songs to listen.

Other Functions

A parametric equalizer (PEQ) is implemented into the AK320 to deliver detailed adjustment of the original sound, and an audio digital signap 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, ±0.5dB GEQ to 20-band, ±0.01dB to more precisely adjust the frequency and gain(dB) as well as more accurately specifying the frequency range via bandwidth value adjustments.

The AK320 supports USB DAC functionality. When connected to a PC or Mac via the USB, the AK320 transforms into a DAC that supports PCM/DSD, delivering richer audio of outstanding soundstage and resolution well beyond the limits of a built-in sound card.

Digital Audio Converter (DAC)           AKM AK4490 x2 (Dual DAC) 
Memory Internal: 128GB
External: microSD card up to 128GB (x1) 
Battery 3400 mAh 3.7V Li-Polymer Battery
Up to 10 hours continuous playback 
Supported Formats WAV, FLAC, WMA, MP3, OGG, APE(Normal, High, Fast), AAC, ALAC, AIFF, DFF, DSF 
Sample Rate PCM: 8kHz ~ 192kHz (8/16/24 per Sample)
DSD: DSD64, Stereo / DSD128, Stereo 
I/O Ports Input: USB Micro-B input (for charging and data transfer)
Output: PHONES(3.5mm) / Optical Out (3.5mm) / Balanced Out (2.5mm, only 4-pole supported) 
Frequency Response Unbalance & Balance: ±0.053dB (Condition: 20Hz ~ 20kHz)
Unbalance: ±0.56dB (Condition: 10Hz ~ 70kHz)
Balance: ±0.55dB (Condition: 10Hz ~ 70kHz) 
Output Impedance Unbalance: 2ohm
Balance: 1ohm
Signal-to-Noise Ratio (SNR) Unbalance: 116dB @1kHz
Balance: 117dB @ 1kHz 

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