PRESONUS HP4

4-Channel Headphone Amplifier With monitor control 4 Separately adjustable stereo headphone outputs: 6.3 mm Stereo headphone Maximum output power: 130 mW 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