The HP4 from PreSonus answers the project studio owner's 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 balanced/unbalanced inputs and outputs (1/4" 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. Even a small project studio can benefit from having an HP4 on hand!

• With monitor control
• 4 Separately adjustable stereo headphone outputs: 6.3 mm Stereo headphone
• Maximum output power: 130 mV per channel
• Distortion factor <0.5% THD + N to 60 ohm load
• Frequency range: 20 - 20,000 Hz
• THD / N: <0.0025% (input and output)
• Recommended earphone impedance: 32 - 600 ohms
• Balanced line input: 6.3 mm jack, L/R
• Balanced monitor output for connecting the studio monitor or for looping to additional headphones: 6.3 mm jack, L/R
• Monitor level as the main volume controller of the studio monitor
• Mute switch for monitor output
• Mono switch for headphone outputs
• Dimensions: 140 x 140 x 45 mm
• Weight: 2.27 kg