The silver coloured version of 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-aluminium 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 utilises an OPA1642 as the voltage pre-amplifier and an AD8397 power amplifier to deliver a maximum power output of 450 mW at 16O (270 mW at 32 O) 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 150O.
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.
Specifications
| Input | 1/8" (3.5 mm) stereo aux |
| Gain | GAIN=L: Sensitivity = 2.4 V GAIN=H: Sensitivity = 0.8 V |
| Output | 1/8" (3.5 mm) stereo headphone |
| Volume Control | ALPS potentiometer |
| Frequency Response | 20 to 20,000 Hz |
| Crosstalk | = 72 dB (Gain=H) |
| Signal to Noise Ratio | > 108 dB |
| THD | 0.004% at 1,000 Hz |
| Channel Imbalance | <0.5 dB |
| Balance Control | GAIN=L: Balance = 0.3 dB GAIN=H: Balance = 0.2 dB |
| 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 O |
| Output Impedance | <0.2 O |
| Output Power | 270 mW (32 O) 450 mW (16 O) |
| Output Current Limit | 92.6 mA |
| Output Voltage | 8.67 Vp-p |
| Dimensions | 3.59 x 2.20 x 0.51" (91.2 x 56.0 x 13.0 mm) |
| Weight | 3.2 oz (92 g) |
