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FiiO A3 Portable Headphone Amplifier


recommendedSolid build and solid performance make this portable amplifier a solid choice for any … solid portable setup.

SKU: FIIOA3 Category: Tag: Brand:

The Fiio A3 is a portable headphone amplifier 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.

We Say

Solid build and solid performance make this portable amplifier a worthy addition to any portable setup.
While not powerful enough to handle especially inefficient headphones it will power more efficient models very well giving them a dynamic and weighted response that might lack from lower quality/lower powered devices.
If your headphones need a bit of a boost this might be the answer.


  • Weight     92 g
  • Dimensions     91.2 mm×56 mm×13 mm
  • Audio Input     3.5 mm stereo Jack
  • Headphone Output     3.5 mm stereo Jack
  • Volume Control     TOCOS potentiometer
  • Bass Boost     1 Level
  • Drive Ability     16~150 Ω (recommend)
  • Power input     recommend DC5V 1A
  • Battery Capacity     1400 mAh
  • Battery Life     >16 h
  • Output Power     270 mW (32 Ω/THD+N<1%) 450 mW (16 Ω/THD+N<1%)
  • Charging Time     <4 h
  • THD     0.004% (1 kHz)
  • Output Impedance     <0.2 Ω
  • Frequency Response     10 Hz~90 kHz(-3dB,Input: 300mV)
  • SNR     >108 dB
  • Input Sensitivity     2.4 V (GAIN=L) 0.8 V (GAIN=H)
  • Channel Imbalance     <0.3 dB
  • Crosstalk     ≥72 dB (Gain=H)
  • MAX Output Current     92.6 mA
  • Gain     -3.8 dB (GAIN=L) 11.7 dB (GAIN=H)
  • Overload Level     >8 Vrms
  • MAX Output Voltage     8.67 Vp-p

Package Contents

Fiio A3 headphone amp
USB charging cable
3.5mm interconnect cable
Silicone bands (x2)
Rubber feet (x6)
Owner’s Manual
Warranty Card