The silver colored 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-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.
|Model Name/Number||A3 (E11K)||Color Available||Black/Silver|
|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|