Ideal for monitoring with bands and artists. The PreSonus HP4 4 Channel Distribution Amplifier is a compact headphone amp designed for live and studio use. The PreSonus HP4 is the perfect companion for any studio engineer or band. It is perfect for use with PreSonus? other interfaces such as TubePre Comp16 and EQ3B. Each of the four channels features its own dedicated volume potentiometer. Each headphone output provides 130mW per channel providing more than enough volume for even the most demanding player. It also includes a mono summing switch for each channel as well as a monitor mute switch. The HP4 provides the ability to daisy-chain multiple units via the monitor outputs for added flexibility.