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Fueling Your Sound.

The KANN series is adored by audiophiles all over the world for its performance that focuses on ultra-high output and clear sound.
KANN ULTRA, the 5th product in the KANN series, continues the success of the KANN series by providing the highest output of any Astell&Kern player, the inclusion of Triple Output Sound, and an optimized processor and UI/UX to make it even easier to enjoy clear sound performance.

With four Gain Modes that provides up to 16Vrms of desktop Hi-Fi level output and sound, and ES9039MPRO Dual DAC chips, KANN ULTRA perfectly powers many of today's headphones with high resolution. A separate Pre/Line Out allow users to enjoy the sound with a variety of different devices.

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Triple Output, Triple Sound

KANN ULTRA features a Triple Output Mode that allows you to enjoy Astell&Kern's perfectly prepared sound when connected to demanding headphones, highly detailed IEMs, and external devices.
Instead of simply separating the output ports, Astell&Kern's Teraton Alpha technology allows for separate amplifier/sound design for the Headphone Out and Line/Pre-Out ports to provide the optimal sound for each port.
Complete your powerful Head-Fi system even on portable devices with the KANN ULTRA with Triple Output.


The port features 4 preset gain settings and ultra-high output of up to 16Vrms. The headphone port is designed to perfectly run demanding headphones with high impedance using only the player with no external AMP.

Gain Unbalanced (3.5mm) Balanced (4.4mm)
Low Gain 2Vrms 4Vrms
Mid Gain 4 Vrms 8Vrms
High Gain 6 Vrms 12 Vrms
Super Gain 8Vrms 16 Vrms


Select Pre-Out mode on the Pre/Line Out port to output sound to an external amplifier or audio device.

[ Pre-out ]
This mode delivers sound through a specially designed Pre out amplifier, instead of the high-powered Headphone out amp.
Pre-Out functions like a PRE AMP and you can control the volume with the volume wheel.

* No Gain or Voltage settings, maximum output 2Vrms/4Vrms


Select Line Out mode on the Pre/Line Out port to output sound that is optimized when connected to external devices.

[ Line out ]
This mode outputs the sound from the DAC directly without going through an amplifier, resulting in the lowest noise level and making it ideal for connecting to external audio devices.
Line Out has a fixed voltage output (4 levels) and no volume control.

* Do not activate the Line Out mode while earphones or headphones are connected to the PRE·LINE OUT port. Doing so may cause permanent hearing loss.

TERATON ALPHA, The Essence of A&K Audio Technologies

From an ultra-high output that can run even the most delicate headphones, to the Triple Output design, and the complex amplifier design with minimal noise in a compact portable audio player, this would all not have been possible without AK's Ultimate Sound Solution, TERATON ALPHA. Astell&Kern has taken the TERATON ALPHA to the next level with its know-how in noise reduction at ultra-high power, acquired from its predecessors such as the KANN MAX and the CA1000 series.

TERATON ALPHA, engineered through continuous research, is Astell&Kern's unique technology that has been designed to produce audio playback that is as close to the original sound through effective power noise removal, efficient power management and unwavering amplification, and a fully converted audio output interface.

Upgraded Sound, the Newest ESS Flagship DAC

The KANN ULTRA is designed with dual ES9039MPRO DACs, the newest flagship DAC from ESS, to deliver richer and more expansive sounds that exceed your expectations.

The ES9039MPRO is an updated ES9039PRO model that has a built-in stereo hardware MQA renderer. It has even more advanced modulation than the existing flagship DAC to reduce power consumption, noise and distortions inside the DAC for enhanced audio performance.

Astell&Kern has redesigned the AMP BLOCK to ensure that the clear, high-resolution sound of the ES9039MPRO is clearly expressed through every port of the Triple Output, and each output's characteristics show its own advanced performance.

Ultra Finessed Sound Engineering with Fully Discrete Design

The KANN ULTRA's brand new triple output circuits adopt an ultra finessed sound design, applying a fully discrete design from the decoding section all the way to the amplifier section.

In the decoding section, two flagship-level ESS ES9039MPRO chips separately decode the left and right audio channels, which can more effectively reduce interference from other sound sources or the environment, lower the possibility of crosstalk, and provide a purer, clearer sound with more accurate sound spatial positioning.

Additionally, the KANN ULTRA specially designs dedicated amplifiers for single-end amplification (3.5mm port) and balanced amplification (4.4mm port) respectively, which can better meet the requirements of the corresponding amplification methods and provide higher sound quality performance and more precise sound.

Incredible User Experience with Next-Generation Octa-Core Processors

KANN ULTRA is the first to feature the next-gen Octa-Core processors with significant performance improvements, allowing you to enjoy KANN ULTRA's incredible sound performance with faster system speeds and a 4th generation UI/UX that flows faster and smoother.

The audio circuit area is physically separated from the processor area, which includes the CPU, memory, and wireless communication components, and is equipped with a dedicated shield can to minimize the heat and noise generated by the processor.

Crossfeed, Speaker effect when listening through headphones

In a headphone environment in which the left and right channels are clearly separated, ear fatigue may increase during prolonged listening. The moment you turn on Crossfeed, the experience of crisp, but comfortable sound begins.

Crossfeed mixes parts of the original signal from one channel and sends that signal to the opposite channel with a time difference to center the sound image.

Through the use of detailed settings such as Shelf Cutoff, Shelf Gain, and Mixer Level, you can set the level of crossfeed according to your listening preferences.

Digital Audio Remaster Technology for Even More Vivid Original Sound

The KANN ULTRA is equipped with Digital Audio Remaster(DAR) technology, which was developed to deliver fine sound at higher sample rates.

DAR technology is developed to upsample the sample rate of the sound source being played to go beyond the limits of the source format.

The high sample rate allows more refined playback and offers delicate and analog-like original sound, helping you to enjoy the richness of the original sound, subtle differences in the nuance of the music and full-bodied sounds at a higher level.

High Quality Wireless Connection and Efficient File Management

In addition to supporting high-definition Bluetooth audio encoding up to 24-bit (aptX-HD/LDAC), allowing streaming of 24-bit/96kHz audio over Bluetooth connections with speeds of up to 990kbps, the KANN ULTRA additionally supports LHDC low latency high resolution audio coding, the second Bluetooth audio coding specification certified by the Japan Audio Society that complies with the Hi-Res Audio Wireless standard, allowing users to enjoy high quality lossless music formats even with wireless Bluetooth products.

Additionally, the KANN ULTRA also simultaneously supports the AK File Drop function, where users simply need to connect their smartphones, computers or personal FTP file systems to the same network to wirelessly transfer music files from their personal devices to the player, adding efficiency to music file management. The KANN ULTRA further supports BT Connect function, where users simply need to connect the player to the audio source device to stream playback wirelessly.


Body Color

Astro Gray

Body Material



5.5inch HD 1080 x 1920 touch screen

Supported Audio Formats


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

[Low Gain] Unbalanced 2Vrms │ Balanced 4Vrms (Condition No Load)
[Mid Gain]Unbalanced 4Vrms │ Balanced 8Vrms (Condition No Load)
[High Gain]Unbalanced 6Vrms │ Balanced 12Vrms (Condition No Load)
[Super Gain]Unbalanced 8Vrms │ Balanced 16Vrms (Condition No Load)
Unbalanced 2Vrms │ Balanced 4Vrms (Condition No Load)




ES9039MPRO x2


32bit/768kHz Bit-to-bit Playback


USB Type-C Input (PC & Mac)


3.5mm(Unbalanced Out, Optical Out), 4.4mm (Balanced Out, only 5-pole supported)
3.5mm(Unbalanced Out), 4.4mm (Balanced Out, only 5-pole supported


802.11 a/b/g/n/ac (2.4/5GHz)


V5.3 (A2DP, AVRCP, Qualcomm® aptX™-HD, LDAC, LHDC)


3.24” (82.4mm)[W] x 5.55” (141.1mm)[H] x 0.96” (24.4mm)[D]


About 13.75oz (390g)

Audio Performance

Frequency Response

[Headphone OUT]
±0.006dB (Condition : 20Hz~20kHz) Unbalanced │ ±0.004dB (Condition : 20Hz~20kHz) Balanced
±0.016dB (Condition : 20Hz~70kHz) Unbalanced │ ±0.020dB (Condition : 20Hz~70kHz) Balanced
±0.022dB (Condition : 20Hz~20kHz) Unbalanced │ ±0.023dB (Condition : 20Hz~20kHz) Balanced
±0.023dB (Condition : 20Hz~70kHz) Unbalanced │ ±0.023dB (Condition : 20Hz~70kHz) Balanced
±0.002dB (Condition : 20Hz~20kHz) Unbalanced │ ±0.002dB (Condition : 20Hz~20kHz) Balanced
±0.007dB (Condition : 20Hz~70kHz) Unbalanced │ ±0.006dB (Condition : 20Hz~70kHz) Balanced"

Signal to Noise Ratio

[Headphone OUT] 115dB @ 1kHz, Unbalanced │ 119dB @ 1kHz, Balanced
[PRE OUT] 110dB @ 1kHz, Unbalanced │ 126dB @ 1kHz, Balanced
[LINE OUT] 110dB @ 1kHz, Unbalanced │ 125dB @ 1kHz, Balanced


[Headphone OUT] 134dB @ 1kHz, Unbalanced │ 140dB @ 1kHz, Balanced
[PRE OUT] 128dB @ 1kHz, Unbalanced │ 128dB @ 1kHz, Balanced
[LINE OUT] 129dB @ 1kHz, Unbalanced │ 121dB @ 1kHz, Balanced


[Headphone OUT] 0.0004% @ 1kHz, Unbalanced │ 0.0004% @ 1kHz, Balanced
[PRE OUT] 0.0012% @ 1kHz, Unbalanced │ 0.0005% @ 1kHz, Balanced
[LINE OUT] 0.0013% @ 1kHz, Unbalanced │ 0.0005% @ 1kHz, Balanced


[Headphone OUT] 0.0006% 800Hz 10kHz (4:1) Unbalanced │0.0006% 800Hz 10kHz (4:1) Balanced
[PRE OUT] 0.0006% 800Hz 10kHz (4:1) Unbalanced │0.0006% 800Hz 10kHz (4:1) Balanced
[LINE OUT] 0.0006% 800Hz 10kHz (4:1) Unbalanced │0.0006% 800Hz 10kHz (4:1) Balanced

Output Impedance

[Headphone OUT] Unbalanced Out 3.5mm (1ohm) │ Balanced Out 4.4mm (1.3ohm)
[PRE OUT] Unbalanced Out 3.5mm (3.5ohm) │ Balanced Out 4.4mm (5.7ohm)
[LINE OUT] Unbalanced Out 3.5mm (6.5ohm) │ Balanced Out 4.4mm (10.7ohm)

Clock source

Clock Jitter

25ps (Typ), 200 Femto Seconds Ref

Battery & Memory


8,400mAh 3.8V Li-Polymer

Playback Time

about 11hours (Standard: FLAC, 16bit, 44.1kHz, Vol.50, LCD Off, Low Gain)

Charge Time

about 3.5hours (PD 3.0 Charger)

Built-in Memory

128GB [NAND]

External Memory

microSD x1 (Max. 1TB)


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