The HP4 answers the project studio owners needs for headphone distribution with professional specifications and more in a small package with an affordable price. The unit comes in a 1/3 rack space chassis similar to the TubePre. The HP4 accepts unbalanced or balanced inputs or outputs (1/4 TS/TRS). The input can either be set to stereo or mono. The mono selector button on the front channel simply copies both inputs to both sides. |