AK PA10 Class A AMP


The First Class-A Portable AMP by Astell&Kern

Astell&Kern has been researching and developing AMP technology to deliver the pure original of audio.
AK PA10 is the first AK model to introduce a Class-A analog AMP based on Astell&Kern's know-how in AMP circuit design technology, and it offers the natural and spacius analog sound of Class-A AMO enhanced further with our proprietary TERATON ALPHA technology.

Enjoy the pure analog sound of Astell&Kern with AK PA10's Current/ Gain/ Crossfeed options for digital audio platers and source devices.


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Analog Sound of Class-A AMP

Class-A AMPs offer the best linear output, providing soft, warm, and natural sounds by amplifying signals without distortions or defect. This characteristic makes it the most sought-after amplification method by music lovers, though it is considered impossible for portable audio devices as it requires high power consumption and design that is difficult to be realized for small devices.

Class-A Current Control

AK PA10 offers a three-stage control of Class-A AMP current, emphasizing the characteristic of Class-A AMP relative to the current value and creating a more intense sound. Also, we addressed the concern of battery drain due to power consumption, the major reason why Class-A AMPs are not sued used for portable devices, by controlling the current value.

Vivid Sound Output of Gain Control

Sufficient AMP output is required to extract all the subtle nuances in music when played back through varying headphones and IEMs. When connected to the balanced input, AK PA10 can support up to 6.2 Vrms output at high gain. Choose the gain level that offers the best sound of the headphone and IEM that you use to enjoy crystal-clear sounds. AK PA10 brings out the full potential that your audio device has to offer.

ALL NEW Crossfeed Effect

As headphones isolate the left/right channels this can cause increased fatigue to a users ears during extended listening periods, and it offers limited spatial sound by comparison when listening to the same music from speakers. Crossfeed mixes some of the signals from one channel and sends them to the opposite channel with a slight delay, creating a more central and natural sound, recreating sounds similar to that of listening via a speaker system, subsequently reducing listening fatigue. AK PA10’s Crossfeed function is implemented exclusively by hardware circuit design, not by digital software, offering a more seamless and sophisticated crossfeed effect without degrading the original sound. Turn on Crossfeed to experience the vivid, authentic and effortless sound this feature has to offer.

True Balanced Circuit Design

Most portable headphone AMPs switch 3.5mm Unbalanced signals to 4.4mm Balanced signals or do not support a 4.4mm Balanced connection at all. Such input/output combinations limit users from using the pure balanced output of the source device resulting in loss of signal during the transition process. Rare for a portable Class-A AMP, AK PA10 supports 4.4mm True Balanced input/output for high output and vivid audio. It also supports 3.5mm unbalanced input/output ports so that you can use it with a wider variety of devices.

Perfect Circuit Design

Amplifying small signals to get greater outputs inevitably drives the noise level up. However, AK PA10 introduces a high output design for the perfect operation of hard to drive headphones, using delicate current control, and a perfect circuit design that is the embodiment of the philosophy of Astell&Kern which continuously aims to deliver pure and refined audio without any noise. AK PA10 incorporates our signature analog volume control that seamlessly delivers the sounds of the Class-A AMP. It also has a separate power supply IC per audio block that is divided into crossfeed, volume, AMP, etc., so that it can comfortably supply the optimal power required for each audio IC. This design eliminates the interfering ripple noise (rippling noise that occurs when power is turned on) of DC-DC power, thereby minimizing audio noises that may be amplified along with the audio.

Full metal Shielding

Our proprietary shield can technology is applied so that noises and electromagnetic waves do not affect the audio block and the design that physically separates unbalanced and balanced circuits completes the high-output and low-noise audio.


Body Color

Graphite Gray

Body Material

Aluminum & Silicone

Analog Inputs

Unbalanced 3.5mm / Balanced 4.4mm

Headphone Outputs

Unbalanced 3.5mm / Balanced 4.4mm

Input Max Level

Unbalanced 2Vrms / Balanced 4Vrms

Output Level

[Low Gain] Unbalanced 2.1Vrms / Balanced 4.2Vrms (Condition No Load),
[High Gain] Unbalanced 3.1Vrms / Balanced 6.2Vrms (Condition No Load)


2.87"(73mm)[W] x 5.51"(140mm)[H] x 0.91"(23.3mm)[D]


about 11.46oz (325g)

Charging Port

USB C Type

Operating Temperature

0℃ ~ + 40℃ (32℉~ 104℉)

Audio Performance

Frequency Response

[Low Gain] ±0.2dB (Condition : 20Hz~20kHz) Unbalanced / ±0.2dB (Condition : 20Hz~20kHz) Balanced
[High Gain] ±0.06dB (Condition : 20Hz~20kHz) Unbalanced / ±0.06dB (Condition : 20Hz~20kHz) Balanced


[Low Gain] 111dB @ 1kHz, Unbalanced / 115dB @ 1kHz, Balanced
[High Gain] 114dB @ 1kHz, Unbalanced / 117dB @ 1kHz, Balanced


[Low Gain] 0.0045% @1kHz, Unbalanced / 0.0015% @1kHz, Balanced
[High Gain] 0.0027% @1kHz, Unbalanced / 0.0013% @1kHz, Balanced


[Low Gain] -83dB @ 1kHz Unbalanced / -110dB @ 1kHz Balanced
[High Gain] -83dB @ 1kHz Unbalanced / -110dB @ 1kHz Balanced

Output Impedance

3.5mm (1.1ohm) / 4.4mm(1.3ohm)



4,200mAh 3.8V Li-Polymer

Charge Time

About 3hours (Standard - 9V / 1.67A Fast Charging) | About 4hours (Standard - 5V / 2A General Charging)

Playback Time

about 12hours (Unbalanced / Input - 1Vrms / Low Gain / Volume 30%)


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