4) Beyerdynamic DT-770-PRO-32 Studio Tracking Headphones+Presonus Headphone Amp

• (4) Beyerdynamic DT-770-PRO-32 Ohm Studio Headphones for Mobile Use
• (1) Presonus HP4 4 Channel Headphone Amplifier Monitoring System HP-4

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Features of DT-770-PRO-32:

• Beyerdynamic DT 770 Pro 32 Ohm Dynamic Studio Headphones
• 32 Ohms drivers for mobile applications
• Closed, diffuse-field studio headphone
• "Bass reflex" technology for improved bass response
• Comfortable fit due to rugged, adjustable, soft padded headband construction
• Robust, easy serviceable construction as all parts are replaceable
• Softskin, circumaural ear pads
• Single sided 1.6 m (5.2 ft.) straight cable
• Including drawstring bag
• Gold plated jack plug (3.5 mm) and adapter (6.35 mm)

Details:

• Transducer type . . . . . . . . . . . . . . . . . . . Dynamic
• Operating principle . . . . . . . . . . . . . . . . Closed
• Nominal frequency response . . . . . . . . . 5 - 35,000 Hz
• Nominal impedance. . . . . . . . . . . . . . . . 32 O
• Nominal SPL . . . . . . . . . . . . . . . . . . . . . 96 dB SPL
• Nominal T.H.D . . . . . . . . . . . . . . . . . . . . < 0.2%
• Power handling capacity . . . . . . . . . . . . 100 mW
• Sound coupling to ear . . . . . . . . . . . . . . Circumaural
• Ambient noise isolation
• 32O version . . . . . . . . . . . . . . . . . . . . . approx. 20 dBA
• Nominal headband pressure . . . . . . . . . approx. 3.5 N
• Weight (without cable) . . . . . . . . . . . . . 270 g
• Length and type of cable
• 32 O version . . . . . . . . . . . . . . . . . . . . . 1.6 m / straight cable
• Connection . . . . . . . . . . . . . . . . . . . . . . Gold plated stereo, jack plug (3.5 mm) and , 1/4" adapter (6.35 mm)

Video of HP4:

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Advantages of purchasing from an authorized seller:

• Best prices - We sell all Presonus Products at wholesale prices
• Full Factory Warranty
• Detailed information of all products
• Lifetime Customer Service by Mackie product Experts
• Guaranteed legitimate and authentic merchandise

Please note: If you purchase Presonus from an un-authorized seller then you are taking a big risk. You will not have any manufacturers warranty, and there is no guarantee that the item is authentic, brand new, or even working.

Features Summary:

• Four High Power Headphone Outputs
• Ultra loud (150mW per channel)
• Ultra quiet operation
• Musical Wide Dynamic Range
• Control Room Monitor Outputs with Level Control
• Mono or Stereo Operation
• Monitor Mute Switch
• Daisy Chain an Infinite Number of Units
• Compact package

Description:

"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

The new HP4 from PreSonus answers the need for a headphone distribution amplifier with professional specifications in a small package at an affordable price. The HP4 features four discrete headphone outputs on the front panel each with its own volume potentiometer and 150mW of amplification per channel. The HP4 also features adjustment over control room monitors with a separate volume control, monitor mute switch and mono switch giving you an extremely powerful monitoring solution at an amazingly low price.

Important Documents:
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Technical 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	5 lbs.
	Dimensions	5.5 x 5.5 x 1.75
	Mounting	Max Rack and Universal Rack Tray
	Chassis	Steel
	Panel	Brushed Aluminum
	Sides	Cast Aluminum

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