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TOPPING NX1s Portable Headphone Amplifier, Upgraded Version of TOPPING NX1a, Smaller and Better!

Specifications:
Main Spec. :
Dimensions: Approx. 8.4cm*5.5cm*1.0 cm
Net Weight: 78g
Color: Full Black/Silver
Shell Material: Aluminum
Analog Input: 1x3.5 mm
Analog Output: 1x3.5 mm
Volume Control: Audio Potentiometer
Mega Bass: On/Off
Gain Select: High/Low
Battery Capacity: 1000mAh
Playback Time: > 40 H
Charging Time: <4 H

Audio Spec. :
Suitable Headphone Impedance: 16-300Ω
Max. Output Power: 150mW x 2(RL=32Ω, THD+N=1%); 25mW x 2(RL=300Ω, THD+N=1%)
Max. Output Voltage Swing: 7.8Vpp
THD+N(@1kHz): 0.003%(RL=32Ω, G=L, P=5mW); 0.0005%(RL=300Ω, G=L, P=5mW)
Frequency Response: 20Hz-100kHz (Far more than CD Quality and Hi-Res Audio's Requirements)
Input Sensitivity: 2.8Vrms(G=L); 1Vrms(G=H)
Power input: DC5V/1A(PC`s USB 0.5A)
Noise(A Weighting): <3uV(Low Gain), <7uV(High Gain)
Gain: 0dB/8.7dB
Bass: 0dB/4.0dB
SNR:≥117dB

Warning: