Samson Q5 5-Channel Headphone Amplifier. Helpful information:
It distributes audio to up to five headphones simultaneously.
Each channel has an independent volume control.
It features a mono/stereo switch for monitoring.
It has balanced inputs and outputs for linking multiple units.
It is suitable for studio and portable use.
It can power headphones between 16 and 600 ohms.
It has a special output to link several Q5s together.
It provides maximum output without compromising audio quality.