Monoprice 111567 Desktop Headphone Amplifier
Brand: Monoprice
Frequency response - 10Hz-20kHz and Impedance - 60 Ohms
The high-current output allows it to drive headphones with a wide range of impedances, from 16 ohms to 600 ohms.
The RCA line outputs allow you to send the output to a stereo amplifier or powered speakers
Frequency response - 20Hz - 20kHz