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FiiO A3
FiiO A3
FiiO A3
FiiO A3
FiiO A3
FiiO A3

FiiO A3


The Fiio A3 - Portable Headphone Amplifier is designed for mobile Hi-Fi listening applications and is compatible with a wide range of headphones, earphones, and other in-ear-monitoring systems. The all aluminum-alloy body and chassis of the amplifier shields against electromagnetic interference and the built-in rechargeable 1400 mAH battery provides approximately 16 hours of operation on a four-hour charge via mini USB port. For I/O, it features an 1/8" stereo auxiliary input and an 1/8" stereo headphone output.

The device utilizes an OPA1642 as the voltage pre-amplifier and an AD8397 power amplifier to deliver a maximum power output of 450 mW at 16Ω (270 mW at 32 Ω) with a frequency response of 20 to 20,000 Hz, a signal-to-noise ratio of equal to or greater than 108 dB, and a T.H.D. of less than 0.004% into loads between 16 and 150Ω.

For controls, the amplifier includes a low-high gain toggle switch, a rotary volume control, and a fully discrete bass boost circuit that can be bypassed to decrease interference and lower the overall noise floor.

Tech Specs


3.5 mm (1/8") stereo aux




3.5 mm (1/8") stereo headphone

Volume Control

ALPS potenitometer

Frequency Response

20 to 20,000 Hz



Signal to Noise Ratio

> 108 dB


0.004% at 1,0000 Hz

Channel Imbalance

<0.5 dB

Balance Control


Charging Time

4 hours

Power Supply

Mini USB Port

Battery Capacity

1400 mAhH

Operating Time

Up to 16 hours

Power Input

5 VDC at 500 mA

Input Impedance

16 to 150 Ω

Output Impedance

<0.2 Ω

Output Power

32 Ω (270 mW)
16 Ω (450 mW)

Output Current Limit

92.6 mA

Output Voltage

8.67 Vp-p


91.2 x 56.0 x 13.0 mm  (3.59 x 2.20 x 0.51”)


92 g (3.2 oz)