The HP4/K77 Headphone Four Pack includes the Presonus HP4 Discrete 4-Channel Headphone Amp, and four AKG K77 Headphones.

Presonus HP4 Discrete 4-Channel Headphone Amp
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.

K77 Headphones
AKG K77 Headphones are all-round closed-back performers with solid bass and clean highs. AKG K77 headphones offer you dynamic around-ear sound quality that is perfect for home studios and listening enjoyment. AKG K77 headphones include comfortable leatherette earpads that allow for extended wear. You get a very accurate listening experience, thanks to an 18Hz-20kHz frequency range. If you perform a lot of desktop recording, engage in late-night rehearsing, or just want to plug into an MP3 player, then AKG K77 headphones are ideal for you.

AKG HP4/K77 Headphone Four Pack Specifications:

• Presonus HP4 Discrete 4-Channel Headphone Amp
• 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
  
  K77 Headphones
• Type: closed-back, dynamic headphones
• Sensitivity: 115 dB/V
• Frequency range: 18 to 20,000 Hz
• Rated impedance: 32 ohms
• Max. input power: 200 mW
• Cable : 2.5 m single-sided (99,9% oxygen-free)
• Connector: stereo mini plug
• Adapter: convertible jack plug (1/8" to 1/4")
• Net weight (without cable): 6.7 oz. (190 g)
• Shipping weight: 14.1 oz., (400 g)

AKG HP4/K77 Headphone Four Pack 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
  
  K77 Headphones
• Closed-back circumaural headphones
• Excellent comfort
• Dynamic, around-ear, closed-back design
• Excellent price/performance ratio
• Great for home recording
• Leatherette earpads

Let the whole band hear today!