Gebrauchsanleitung Instructions for use Notice demploi Istruzioni per luso Instrucciones para el uso Gebruiksaanwijzing
HMD 280 PRO / HMD 280-13 HMD 281 PRO / HMD 281-13
Thank you for choosing Sennheiser!
Over half a century of accumulated expertise in the design and manufacture of high-quality electro-acoustic equipment have made Sennheiser a world-leading company in this field. We have designed this product to give you reliable operation over many years. Please take a few moments to read these instructions carefully, as we want you to enjoy your new Sennheiser product quickly and to the full.

Headset features

HMD 280 PRO headset Accurate, linear sound reproduction for critical monitoring applications Low impedance headset (64 impedance) Space-saving design features collapsible, rotating earcups Up to 32 dB of ambient noise attenuation Neodymium magnets for high maximum SPL (113 dB / 1 Vrms) Very comfortable, even if used for long periods due to very light weight soft, circum-aural ear cushions padded, adjustable headband Single-coiled cable Noise-cancelling, super-cardioid boom microphone, with excellent rejection of handling noise Very rugged with user-replaceable parts

Contents

Headset features.. 17
HMD 280 PRO headset.. 17 HMD 280-13 headset... 17 HMD 281 PRO headset.. 17 HMD 281-13 headset... 17
Areas of application.. 18 Delivery includes.. 18 Preparing the headset for use.. 20
Adjusting the headband... 20 Relocating the microphone boom. 20 Sliding over the wind screen.. 20 Position the microphone towards the corner of the mouth... 20 Mounting a connector... 20
HMD 280-13 headset As HMD 280 PRO, but high impedance variant (300 impedance).
Folding up the headset.. 21 Cleaning the headset.. 21 Replacing spare parts.. 22
Available accessories and spare parts.. 22 Replacing the ear cushions.. 22 Replacing the headband padding.. 22 Replacing the wind screen.. 22 Replacing the connecting cable.. 23 Replacing the microphone.. 23
HMD 281 PRO headset As HMD 280 PRO, but single-sided variant.
HMD 281-13 headset As HMD 281 PRO, but high impedance variant (300 impedance).
Specifications.. 24 Frequency response curves and polar diagram. 25 Connection diagrams.. 26
Connection diagram HMD 280.. 26 Connection diagram HMD 281.. 26

Areas of application

The noise-cancelling microphone provides clear communications even in a noisy environment. The headphones not only effectively attenuate external noise but also minimise spillage from the headphones to the outside world. The headsets are designed for applications in the professional audio field, such as broadcast, TV, film, theater and recording applications. The headsets can be used for live presentations for news reporting with talkback systems with intercom systems, etc. The single-sided headset is mainly used to provide camera teams with programme signals.

Attention! High volume!

This is a professional headset. Commercial use is subject to the rules and regulations of the trade association responsible. Sennheiser, as the manufacturer, is therefore obliged to expressly point out possible health risks arising from use. This system is capable of producing sound pressure exceeding 85 dB(A). 85 dB(A) is the sound pressure corresponding to the maximum permissible volume which is by law (in some countries) allowed to affect your hearing for the duration of a working day. It is used as a basis according to the specifications of industrial medicine. Higher volumes or longer durations can damage your hearing. At higher volumes, the duration must be shortened in order to prevent damage. The following are sure signs that you have been subjected to excessive noise for too long a time:

Delivery includes

Headset Wind and pop screen Instructions for use
You can hear ringing or whistling noise in your ears! You have the impression (even for a short time

only) that you can no longer hear high frequencies!
Preparing the headset for use
Adjusting the headband For good transmission quality and best possible comfort, the headband has to be adjusted to properly fit your head. To do so, adjust the headband via its snap-in locking mechanism.

Folding up the headset

For space-saving transportation, the headset can be folded up in two different ways: 1. To fold up the headset as compact as possible, tuck the earcup without microphone boom inside the headband. Then fold the earcup with the microphone boom against the headband.
Relocating the microphone boom The microphone boom can be worn on either side of the mouth.
Loosen the quick-fixing device. Turn the microphone boom towards the mouth. Tighten the quick-fixing device.
2. To fold up the headset as flat as possible, the earcups can be rotated by 90. Press the microphone with the flexible microphone boom as far as possible against the earcups.
Sliding over the wind screen Before using the headset, slide the wind screen over the microphone. The wind screen must totally enclose the microphone.

Cleaning the headset

To clean the headset, use a soft, damp cloth. If necessary, the headset can be cleaned with soapy water (use a mild cleanser such as washing-up liquid). Note: Never use solvent-containing cleansers.
Important: Position the microphone towards the corner of the mouth The headsets feature a flexible microphone boom. Bend the microphone boom so that the microphone is placed at the corner of the mouth. Maintain a distance of approx. 2 cm between microphone and mouth. In this position, the risk of pop noise is reduced to a minimum.
Mounting a connector To mate with any signal jack the headsets connecting cable can be fitted with a connector of your choice (u Connection diagrams). 20 21

Replacing spare parts

Available accessories and spare parts Ear cushions Headband padding Wind screen for microphone Connecting cable
Replacing the ear cushions Grasp behind the ear cushions and pull them up and away from the earcups. Slide the new ear cushions onto the earcups.
Replacing the headband padding
Pull the Ziploc type fastening strips of the headband padding apart, as shown in the diagram on the left, and remove the worn headband padding. Put the new headband padding around the headband. Pull the two edges of the headband padding together so that the fastening strips slightly overlap. Join the fastening strips.
Replacing the connecting cable Replace the connecting cable if it is damaged. To do so, please proceed as follows: Remove the ear cushion. Grasp behind the ear cushion and pull it up and away from the earcup. Loosen the screw and remove it. Remove the cover with the microphone boom from the earcup. Pull the connector out of the socket. Remove the antikink protection of the connecting cable from the holding device. Insert the antikink protection of the new connecting cable into the holding device. Plug the connector of the new connecting cable into the socket as shown in the diagram on the left. Put the cover with the microphone boom back onto the earcup. Replace the screw and tighten it. Slide the ear cushion onto the earcup.

Replacing the microphone If the microphone of your headset should be defective, it must be replaced by your Sennheiser service partner.
Replacing the wind screen If the wind screen for the microphone shows signs of wear such as tears or holes, replace the wind screen.

Specifications

HMD 280 PRO / HMD 281 PRO HMD 280-13 / HMD 281-13 Headphones
Classification (as per IEC 268-7) Transducer principle Impedance Long-term max. input power Ear coupling Frequency response (10 dB referred to 1 kHz) Sound pressure level Ambient noise attenuation THD Weight Contact pressure Length of coiled cable 268-7-IEC-DCSC-64R0-2/-1 dynamic 64 (as per IEC 268-7) 0.5 W (as per IEC 268-7) circum-aural 8 Hz25 kHz 102 dB (as per IEC 268-7) 113 dB / 1 Vrms max. 32 dB < 0.1 % (at 1 kHz, 100 dB SPL) approx. 310 g / 245 g approx. 4 N min. 1 m max. 3 m 268-7-IEC-DCSC-03R2-2/-1 dynamic 300 (as per IEC 268-7) 0.5 W (as per IEC 268-7) circum-aural 8 Hz25 kHz 102 dB (as per IEC 268-7) 107 dB / 1 Vrms max. 32 dB < 0.1 % (at 1 kHz, 100 dB SPL) approx. 310 g / 245 g approx. 4 N min. 1 m max. 3 m
Frequency response curves and polar diagram
Diffuse field frequency response Headphones

dB (1 Pa/V)

Frequency response curve Microphone (measured in the near field with artificial mouth B&K 4219)

-50 -55 -60

Microphone
Transducer principle Type of microphone Pick-up pattern Nominal impedance Close-talking sensitivity Near field frequency response dynamic pressure-gradient dBV/Pa (at 1 kHz) 0.7 mV/Pa (at 1 kHz) 5013,500 Hz dynamic pressure-gradient 200 63 dBV/Pa (at 1 kHz) 0.7 mV/Pa (at 1 kHz) 5013,500 Hz

dB -70 (V/Pa)

-75 -80 -85 -90 -95 -100
super-cardioid (see polar diagram) super-cardioid (see polar diagram)

Polar diagram Microphone

Connection diagrams
The HMD 280 and HMD 281 headsets can be fitted with a connector of your choice. For correct pin assignment, please refer to the connection diagrams below.

Connection diagram HMD 280
Connectors for HMD 280 and HMD 281

AF-out

screen

yellow (+)

white (+)

black ()

Connection diagram HMD 281

not connected

blue ()

red (+)

green ()
Aktuelle Informationen zu Sennheiser-Produkten erhalten Sie auch im Internet unter http://www.sennheiser.com. For up-to-date information on Sennheiser products, you can also visit the Sennheiser Web site at http://www.sennheiser.com. Vous trouverez galement toutes les informations actuelles relatives aux produits Sennheiser sur Internet ladresse Web http://www.sennheiser.com. Informazioni attuali sulla gamma di prodotti Sennheiser sono disponibili anche in Internet al sito http://www.sennheiser.com. Tambin en Internet, bajo http://www.sennheiser.com obtendr Vd. informaciones actuales sobre los productos Sennheiser. Actuele informatie met betrekking tot Sennheiser producten vindt u ook op Internet onder http://www.sennheiser.com.
Sennheiser electronic GmbH & Co. KG D-30900 Wedemark Telefon: +49 (0) 0 Telefax: +49 (0) 300
Printed in Germany Publ. 10// A01

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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