PreSonus HP4 Headphone AmplifierThe HP4 Headphone Amplifier from PreSonus is simple to set up and use while including all the features you need to create a versatile headphone system. This compact amp can sit on a tabletop, or it can be screw mounted to a standard rack tray (not included), where it requires just 1 3 rackspace. With a clean, clear sound with a wide dynamic range, the HP4 headphone distribution system boasts the portability, versatility, and quality to meet your