Product: Monoprice 615220 4-Channel Headphone Amplifier
Brand: Monoprice
35mm) amplified headphone outputs each with its own independent volume control
It features an extremely clean amplifier circuit which produces a signal-to-noise ratio greater than 98db
It accepts line-level audio input over the stereo RCA jacks on the back or headphone level through the optional 1/4 TRS jack

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