RA200AMP-plus is full balanced headphone amplifier , line amp is using“CAST”(Current Audio Signal Transmission) current pass through, non-negative feedback transistor circuit, highest frequency response, more details.
Current amplifier is using matched pair transistor , full time class A . Line amp and power amp are working in full time current pass throuht , lower signal distortion and super liner booster, headphone output is more clear , natural and details;
RA200AMP-plus support full balance and unbalance clossover input, when unbalance input , will auto switch to balanced output. Fet-buff working on balance and unbalance line amp circuit, can match most device input resistance.
Power output using 4 piars 12.5W BD139/140, full time class A ampifity can easy to driver more than 600 ohms headphone .
.RA200AMP-plus using 3.7V 8000mAh Li-ion battery, suppot 5V 3A USB type C fast charging, including low voilage & short circuit protection.
.LED power inductor : when the battery is charging ,4 LEDs is flashing. 4 LED battery full charged , 3 is 75% , 2 is 50% , 1 is less than 25%.