Presonus Hp4 4-Channel Headphone Amplifier

Input/Output 4 screaming-loud (130 mW per channel) stereo headphone outputs (front panel) Meters, Controls, and Features 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 Physical Compact 1/3U rack-mount chassis Sealed, detented, metal rotary controls External 16 VAC power supply Technical Specifications Inputs Connector Type TRS, balanced THD+N 0.0025%, 1 kHz, unity gain Max Input Level +18 dBu, lt;0.5% THD+N, unity gain Input Impedance 10 k Frequency Response 20 Hz - 20 kHz, 0.5dB Monitor Outputs Connector Type TRS, asymmetrical, impedance-balanced THD+N 0.0025%, 1 kHz, unity gain Max Output Level +18 dBu, lt;0.5% THD+N Output Impedance 51 Frequency Response 20 Hz - 20 kHz, 0.5dB Headphone Outputs Connector Type TRS, stereo Max Output Power 130 mW/Ch., lt;0.5% THD+N, 60 load Frequency Response 20 Hz - 20 kHz, 0.5 dB, 60 load Headphone Impedance Working Range 32 - 600 Power Physical Dimensions 1/3U rack-mount (with standard rack tray, not included) Height 1.75 (44.45 mm) Depth 5.5 #34; (139.7 mm) Width 5.5 (139.7 mm)