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Headphone Amplifiers

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Portable Headphone Amplifier
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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.

Technical Specifications

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    

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