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Amplifier Comparison

Model/Number A1 A3 (E11K) A5 (FA5121)
General Specifications
Color Available Silver Black / Silver Titanium / Black
Dimensions 42mm x 40.7mm x 9.4mm 91.2 mm × 56 mm × 13 mm 124 mm × 65.5 mm × 14.5 mm
Weight 20g (incl. belt clip) 92g (incl. battery) 168g (incl. battery)
Power Indicator Yes Yes Yes
Audio input 3.5 mm stereo jack 3.5 mm stereo jack 3.5 mm stereo jack
Headphone Output 3.5 mm stereo jack 3.5 mm stereo jack 3.5 mm stereo jack
Drive Ability 16~150 Ω (recommend) 16~150 Ω (recommend) 16~300 Ω (recommend)
Volume Control Digital volume control TOCOS Potentiometer Alps Potentiometer
BASS Boost 2 Levels 1 Level 1 Level
GAIN Control NO 2 Levels 2 Levels
Crossfeed NO NO NO
Supply Votage Adjustable NO NO NO
Audio Performance
Output Power >100 mW (16 Ω/THD+N<1%) >450 mW (16 Ω/THD+N<1%) >800 mW(32Ω/THD<1%)  
≥150mW(300Ω/THD<1%)
Frequency Response 20 Hz~20 kHz 10 Hz~90 kHz (-3dB,Input: 300mV) 10 Hz~90 kHz(-3dB,Input: 220mV)
SNR ≥100dB (A-weighted) >108 dB ≥115dB (A-weighted)
Output Impedance <0.2 Ω <0.2 Ω <0.3 Ω
Crosstalk ≥65 dB(1 kHz) >72 dB (1 kHz) ≥ 75 dB (1 kHz)
THD+N <0.05% (1 kHz <0.004% (1 kHz) <0.002% (1 kHz)
MAX BASS Boost Bass1: 2.7dB bass boost Bass2: 5.2dB bass boost Bass3: 5.2dB bass reduction >5 dB (BASS ON >5 dB (BASS ON)
MAX Gain 3.65 dB >11 dB ≥13 dB
Peak Output Voltage 4.52 Vp-p >8.67 Vp-p 14.96 Vp-p
MAX Output Current 50 mA >92.6 mA 250 mA(For reference)
Input Overload 1.35Vrms / 250 mA(For reference)
Power and Battery
Power/Charger recommend DC5V 0.8~1A recommend DC5V 1A recommend DC5V 2A<
Charing Indicator Yes Yes Yes
Low Battery Alarm No Yes Yes
Smart Charge No Yes Yes
Replaceable Battery No No No
Capacity 160 mAh 1400 mAh 880 mAh
Battery Life >13 h >16 h ≥13 h
Charge Time ≤90 mins <4 h <3 h