With excellent specs, low cost and compact size (1/3 rack width), the HP4 from PreSonus is a great tool for project studios or live monitoring applications. The HP4 accepts unbalanced or balanced inputs or outputs (¼” TS/TRS). The . . .
Use the Rolls HA43 4-channel headphone amplifier when you need to expand or generate headphone channels. It has a ¼” stereo input, four volume controls, four ¼” stereo output jacks and is powered by an AC adapter (included). . . .
The Behringer MA400 is a unique and inexpensive personal monitoring headphone amplifier. The lightweight, minature unit allows for independent microphone and line level monitoring simulataneously, and it accepts balanced and unbalanced . . .
The POWERPLAY P1 from Behringer is a personal in-ear monitor headphone amplifier that can be used on stage or in the studio, to provide performers and recording artists with a flexible, convenient personal monitoring solution.