PreSonus HP4 Headphone Distribution System

4-channel 150 mW headphone-distribution system with left and right line inputs, left and right line outputs with level control, and the four headphone outs. You can adjust the overall headphone level, sum the stereo signals to mono, and mute the rear-panel Monitor outputs.

The Monitor Mute button mutes the main rear-panel outputs. This is handy when recording in front of a computer and studio monitors, especially when you don’t have a hardware mixer, because you can mute the signal going to the monitors rather than turn down the monitor level. The headphone outputs remain active when the Monitor Mute button is engaged. If your needs grow, you can use the line outputs to feed the inputs of a second HP4.

Features :

• 4 x 150 mW stereo ¼” headphone outputs (front panel) 
• 2 x balanced ¼” line outputs (monitor outputs) 
• 2 x balanced ¼” line inputs 
• Headphone level control for each channel 
• Mono summing switch for each channel 
• Monitor level control 
• Monitor mute switch 
• Daisy-chain multiple units via monitor outputs
• Compact 1/3U rack-mount chassis 
• Sealed, detented, metal rotary controls 

Specifications :

• Inputs : 
  • Connector Type : ¼” TRS, balanced 
  • THD+N : 0.0025%, 1 kHz, unity gain 
  • Max Input Level : +18 dBu, <0.5% THD+N, unity gain 
  • Input Impedance : 10 k ohm 
  • Frequency Response : 20 Hz - 20 kHz, ±0.5dB 
• Monitor Outputs :
  • Connector Type : ¼” TRS, asymmetrical, impedance-balanced 
  • THD+N : 0.0025%, 1 kHz, unity gain 
  • Max Output Level : +18 dBu, <0.5% THD+N 
  • Output Impedance : 51ohm 
  • Frequency Response : 20 Hz - 20 kHz, ±0.5dB 
• Headphone Outputs :
  • Connector Type : ¼” TRS, stereo 
  • Max Output Power : 130 mW/Ch., <0.5% THD+N, 60 ohm load 
  • Frequency Response : 20 Hz - 20 kHz, ±0.5 dB, 60 ohm load 
  • Headphone Impedance Working Range : 32 ohm - 600 ohm
• Dimensions :
  • 1/3U rack-mount (with standard rack tray, not included) 
  • Height : 44.45 mm x Depth : 139.7 mm x Width : 139.7 mm
• Weight : 2.27 kg