Astell & Kern PAF11 (AK380 AMP)

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Designed to match the AK380 in both appearance and function, the Astell&Kern PAF11 Headphone Amplifier features a built-in 9-hour rechargeable battery, similar to that of the AK380. It features an 1/8" headphone jack and a 2.5mm balanced out, and charges via a micro USB port.

High Gain
The AK380 AMP supports 8.1 VRMS output when connected via high-gain balanced output. This high-gain output is nearly four times greater than the low-gain output (2.1 VRMS via the unbalanced output) and supports high-impedance headphones. To protect earphones/headphones during high output, the volume is automatically adjusted when the amp is powered on or the earphones/headphones are disconnected. Furthermore, the gain can be easily adjusted via the AK380's settings.
3,400 mAh Large-capacity Battery
The AK380 AMP features a 3400 mAh battery - identical to the one in the AK380 itself - to support up to nine hours of continuous unbalanced-output playback. Please note that the AK380 AMP battery will not provide power to the AK380.
Enhanced Convenience
The AK380 and AK380 AMP can charge simultaneously. A separate cable is not required thanks to its integrated design, and it features an easy connection via the screw cap. Integrated volume control via the AK380 is also provided.
Integrated Design
The AK380 AMP was designed as an extension of the light-and-shadow theme of the AK380. 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 through the gaps in the reflected surface is designed to visually accentuate the player. The wheel on the rear of the amplifier that connects the two devices is a representation of the volume wheel seen on the AK380.
Input Connections 1 x Type-B micro USB in (charging and data transfer, Windows/Mac)
Connection Mode: MTP (media device)
Output Connectors 1 x 1/8" (3.5 mm) headphone jack
1 x 2.5 mm balanced out (only 4-pole supported)
Output Level Low Gain, Unbalanced: 2.1 VRMS
Low Gain, Balanced 2.1 VRMS (No Load)
High Gain Unbalanced: 4.1 VRMS
High Gain, Balanced 8.1 VRMS (No Load)
Frequency Response Low Gain, Unbalanced: ±0.06 dB @ 20 Hz to 20 kHz
Low Gain, Balanced: ±0.06 dB @ 20 Hz to 20 kHz
High Gain, Unbalanced: ±0.03 dB @ 20 Hz to 20 kHz
High Gain, Balanced: ±0.03 dB @ 20 Hz to 20 kHz
Signal to Noise Ratio Low Gain, Unbalanced: 110 dB @ 1 kHz
Low Gain, Balanced 110 dB @ 1 kHz
High Gain, Unbalanced: 113 dB @ 1 kHz
High Gain, Balanced: 114 dB @ 1 kHz
Crosstalk Low Gain, Unbalanced: 108 dB @ 1 kHz
Low Gain, Balanced: 130 dB @ 1 kHz
High Gain, Unbalanced: 108 dB @ 1 kHz
High Gain, Balanced: 128 dB @ 1 kHz
Gain Low Gain, Unbalanced: 2.1 VRMS
Low Gain, Balanced: 2.1 VRMS, No Load
High Gain, Unbalanced: 4.1 VRMS
High Gain, Balanced: 8.1 VRMS, No Load
Body Material Aluminum
Power Built-in 3400 mAh battery
Battery Life Up to approximately 9 hours
Dimensions 3.2 x 5.0 x 0.4" (80.7 x 128.4 x 10.3 mm)
Weight 5.8 oz (165.0 g)

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