The Topping A50s Desktop Headphone Amplifier uses trickle down NFCA technology from the flagship A90 model sharing in the high detail high current output to drive a wide range of headphones. The two gain settings between 0d B & 6d B (or 6d B / 12d B with 4.4mm balanced output) let you adjust the A50s to match your home listening setup. With extremely low noise a mere 0.3u Vrms this headphone amplifier ensures the signal from your high resolution source remains unadulterated without unwanted or electrical sound leaching into the signal. The Topping A50s sets the stage to allow sensitive or power hungry headphones alike to truly perform with a maximum output power of 3500m W per channel.