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Astell & Kern AK300 Series Amp

Special Price $499.00 Regular Price $699.00
US Sales Only at Moon Audio

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The AK300 Series Amp is compatible with the AK300, AK320, and AK380 Media Players.

The AK300 Series Amp supports high-impedance headphones and high-gain output while remaining faithful to the original sound.

The AK Amp is the first accessory to specifically complement the AK380 and AK320 Media Players.

The AK Amp supports high-impedance headphones and high-gain output while remaining faithful to the original sound.

Main Features:

  • Expansion-type amplifier with design unity
  • 3,400 mAh large-capacity battery
  • Supports up to nine hours of continuous unbalanced-output playback
  • 8.1 VRMS high-gain balanced output
  • 4.1 VRMS unbalanced output
  • Convenient Portability

High Gain

The AK380 Amp supports 8.1 VRMS output when connected via high-gain balanced output. 

Low Gain

Unbalance 2.1 Vrms / Balance 2.1 Vrms (Condition No Load)

High Gain

Unbalance 4.1 Vrms / Balance 8.1 Vrms (Condition No Load)

High-gain output is four times greater than low-gain output and supports high-impedance headphones.

To protect earphones and headphones during high output, the volume is automatically adjusted when the amp is powered on or the earphones or headphones are disconnected.

Furthermore, the gain can be easily adjusted via the AK380's settings.

When the AK380 Amp is connected, USB DAC and optical out functionalities through the amplifier are disabled.

Amp powered on


Earphones/headphones disconnected


Gain changed


Audio Block

AK380 Amp Audio Block

3,400 mAh Large-capacity Battery

In general, amplifiers with increased audio output consume a greater amount of energy.

For this reason, the AK380 Amp  features a 3,400 mAh large-capacity battery – identical to the one in the AK380 itself - to support up to nine hours of continuous unbalanced-output playback.

AK380 Amp vs. Other amps

One of the main features of the AK380 Amp is its convenient portability.Astell & Kern addresses many points of discomfort in conventional amplifiers and implements an integrated design for greater convenience in the AK380 Amp.


AK380 Amp

Other Amps


AK380 + AK380 AMP simultaneous charging.

Separate charging of device and amp.

Separate cable not required due to integrated design.

Separate cable for connecting device and amp.

Easy connection using a Screw Cap.

Device and amp connection via separate band.

Volume Control

Integrated volume control using the AK380.

Separate volume controls for device and amp.

Integrated Design

The AK380 Ammp is designed as an extension of the light and shadow theme of the AK380 Media Player.

Like the AK380 medial player, the AK380 Amp retains subtle changes and details in the emitted brilliance as light flows across its surface.

The diamond pattern engraved into the volume wheel of AK380 is repeated on the amplifier's rear light for design continuity.

The area of the amplifier in contact with the AK380's volume wheel reproduces the design's angle of reflection for comfortable wheel operation. The amplifier's light shining delicately through the gaps in the reflected surface visually accentuate the music’s mystique.

Unlike conventional amplifiers, the AK380 Amp was designed from the ground up as a single entity when combined with the AK380.

The wheel on the rear of the amplifier that connects the two devices is a representation of the volume wheel seen throughout Astell&Kern products and expresses Astell & Kern's unique design identity.

Product Reviews

General Specifications  


Body Color

Meteoric Titan

Body Material


Output Level

[Low Gain] Unbalanced 2.1 VRMS / Balanced 2.1 VRMS (Condition: No Load)

[High Gain] Unbalanced 4.1 VRMS / Balanced 8.1 VRMS (Condition: No Load)


Type-B micro-USB Input (Charging & data transfer (PC & Mac))

/ Connection Mode: MTP (Media Device)


PHONES (3.5mm) / Balanced Out (2.5mm, only 4-pole supported)


3.17 ”(80.7 mm) [W] x 5.01 ”(128.4 mm) [H] x 0.40 ”(10.3 mm) [D]


5.82 oz (165 g)

Audio Performance  
Frequency Response

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

[High Gain] ±0.03 dB (Condition: 20 Hz – 20 kHz) Unbalanced / ±0.03 dB (Condition: 20 Hz – 20 kHz) Balanced

Signal to Noise Ratio

[Low Gain] 110 dB @ 1 kHz, Unbalanced / 110 dB @ 1 kHz, Balanced

[High Gain] 113 dB @ 1 kHz, Unbalanced / 114 dB @ 1 kHz, Balanced


[Low Gain] 108 dB @ 1 kHz, Unbalanced / 130 dB @ 1 kHz, Balanced

[High Gain] 108 dB @ 1 kHz, Unbalanced / 128 dB @ 1 kHz, Balanced


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