Headphone Measurements:

Sennheiser HD 280 Pro

Frequency Response
Top - Compensated and Averaged Bottom - Raw Data for Five Headphone Positions 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -Frequency 10000 100000
0 -5 Reduction in dB -10 -15 -20 -25 -30 -35 -40 -45 -100

Isolation

Attenuation of External Sound vs. Frequency

Amplitude (dB)

1000 Frequency

100000

Electrical Impedance and Phase
Measured with 600 Ohm output impedance. Impedance in Ohms 1000 Frequency 10000 Impedance Phase -40 -0 -Phase in Degrees
0.05 0.04 0.03 0.02 Volts 0.01 0

30 Hz Square Wave

-0.01 -0.02 -0.03 -0.04 -0.05 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10

Time in Seconds

%THD+noise @ 90dB and 100dB

300 Hz Square Wave

0.04 0.03

10 %THD+noise

0.02 0.01
10 Frequency 10000 100000

-0.01 -0.02 -0.03

-0.04 0.000

0.008 Right

0.009 Left

Left 90dB

Right 90dB

Left 100dB

Right 100dB

Impulse Response

Volts RMS required to reach 90dB SPL: Impedance @ 1kHz: Power Needed for 90d BSPL Broadband Isolation in dB (100Hz to 10kHz):

0.0.06 -16

Vrms Ohms mW dBr

-0.03 0.0000

0.0003

0.0006

0.0009

0.0012

0.0015

0.0018

0.0021

0.0024

0.0027

0.0030

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HD 280 PROFESSIONAL

Circumaural, Closed Headphones
The HD280 Professional is Sennheiser's most significant closed, circumaural headphone to be introduced in years. Designed to exceed the demands of the professional environment, the HD280Pro boasts extremely robust construction combined with extensive features that meet the requirements of today's most demanding applications. The unique collapsible design combined with swiveling ear cups, offers maximum flexibility in any application.

Features & Benefits

Closed, dynamic stereo headphones Accurate, linear sound reproduction for critical monitoring applications Optimum impedance ensures universal compatability Space saving design features collapsible, rotating earcups Up to 32 dB of ambient noise attenuation Neodymium magnets for high maximum SPL Single-sided, coiled cable with 3.5 mm mini jack with locking 1/4" adapter Very comfortable, even if used for long periods of time Rugged construction with user-replaceable parts 2 year warranty

Technical Data

Transducer Ear coupling Frequency response Characteristic SPL THD Nominal impedance Weight (without cable) Connection cabl e Connector Dynamic Circumaural, Closed 8 Hz - 25 kHz 113 dB (at 1 kHz/1Vrms) <0.1% 64 Ohms 285 grams 1 meter single-sided coiled cable, OFC copper 3.5 mm stereo mini jack with screw-on 1/4" adapter

Replaceable Parts

Ear cushions Headband cushion Driver elements Cable
Sennheiser Electronic Corporation, 1 Enterprise Drive, Old Lyme, CT 06371 Telephone: 860-434-9190 Fax: 860-434-1759 Web: http://www.sennheiserusa.com
Sennheiser Mexico: Av. Xola 613, PH6, Col. Del Valle 03100, Mexico, DF. Telephone: (525) 639-0956. Fax: (525) 639-9482 Sennheiser Canada: 221 Labrosse Ave, Pte-Claire, PQ H9R 1A3. Telephone: 514-426-3013. Fax: 514-426-3953 Manufacturing Plant: Am Labor 1, 30900 Wedemark, Germany