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Description:

Includes four PreSonus HD9 closed-back professional studio headphones and a PreSonus HP4 four-channel headphone amplifier.

HD9: 45 mm dynamic, neodymium drivers; closed acoustic design; tailored frequency response from 10 Hz to 26 kHz with accurate low frequencies; high power handling (900 mW per channel into 40 ohms).

HP4: Four screaming-loud (150 mW per channel) stereo headphone outputs; 2 balanced ¼-inch, line-level monitor outputs that can be used to daisy-chain additional headphone amps; 2 balanced ¼-inch, line-level inputs; headphone level control and Mono summing switch for each channel.

 Features:

• PRESONUS HD9/HP4 PACK With HP4 Headphone Amplifier+ (4) HD9 Studio Headphones
• HD9 Features
  • Closed back, circumaural acoustic design
  • Two-way, 180° cup rotation
  • Tailored frequency response (10 Hz - 26 kHz)
  • Accurate low-frequency response
  • High-power handling (1,800 mW @ 40Ω, 900 mW per channel)
  • 45 mm dynamic, neodymium drivers
  • 96 dB sensitivity (±3 dB)
  • 10 foot (3m), straight, single-sided cable with 1/8 inch connector
  • Gold-plated 1/8 inch-to-¼ inch adapted
• HP4 Features:
  • 4 screaming-loud (150 mW per channel) stereo headphone outputs
  • 2 balanced ¼-inch, line-level monitor outputs
  • 2 balanced ¼-inch, line-level 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