Professional recording quality, desktop size.

The PreSonus HP4 Discrete 4-Channel Headphone Amp features 4 headphone outputs on the front panel, each with its own volume, and 150mW of amplification per channel — extremely loud output with a low -98dB noise floor. It also allows control over control room monitors with a separate volume knob that can be muted using the Monitor Mute button. 1/3 rackspace. Accepts balanced/unbalanced inputs and outputs (1/4" TRS). Input can either be set to stereo or mono (the mono selector button on the front channel simply copies both inputs to both sides). Powered by an external wall-mounted supply.

The HP4 represents a tremendous value as echoed by this email received by PreSonus:

"To my amazement, your HP4 sounded as good as both of my hi-fi stereo heaphone amps. Very very clean and loud. I can't believe you put 150 mw per channel, @52 ohms, to four headphone outputs and offer such a quality unit for very little over $100." (M. Burke via email)

PreSonus HP4 Discrete 4-Channel Headphone Amp Features:

4 discrete headphone outputs
Each with its own volume and 150mW of power
Extremely loud output with low noise (-98dB noise floor)
Allows control over control room monitors with a separate volume knob
Control room volume can be muted using the Monitor Mute button
1/3 rackspace
Balanced/unbalanced TRS I/O
Powered by an external wall-mounted supply

PreSonus HP4 Discrete 4-Channel Headphone Amp Specifications:

Input:
TRS Impedance: 10K Ohms

Panel Controls:
Headphone Level 1 to 12
Monitor / Feed Output -80dB to +10dB
Mono Switch
Monitor / Feed Mute

Power Supply:
Type Linear
Input 16VAC/1000mA (factory configured)

Output:
TRS Balanced: 51 Ohms Impedance

Performance:
THD+Noise (Unweighted): 0.002%
Noise Floor : -98dB
Signal To Noise: >95dB
Power Supply Rejection: >98dB
Power: 16 Watts

Physical:
Weight: 5lbs.
Dimensions: 5.5" x 5.5" x 1.75"
Mounting: Max Rack and Universal Rack Tray
Chassis: Steel
Panel: Brushed Aluminum
Sides: Cast Aluminum