HME 45-C - Headphones SENNHEISER - Free user manual and instructions

Product type	Wired headset/microphone set
Brand	Sennheiser
Model	HME 45-C
Transducer principle (headphone)	Dynamic, open
Bandwidth (headphone)	20 Hz - 18 kHz
Impedance (headphone)	150 ohms (mono), 300 ohms per channel (stereo)
Harmonic distortion (headphone)	< 1%
Transducer principle (microphone)	Noise-compensating back-electret capsule
Bandwidth (microphone)	100 Hz - 5 kHz at 2 cm from mouth
Output voltage (microphone)	-35 dBV/Pa
Microphone power requirement	3.5 - 10 V DC
Ear pad pressure	Approximately 1.6 N
Weight (without cable)	140 g
Cable length	1.8 m (single-sided)
Connector	5-pin XLR
Color	Black (estimated)
Intended use	Telephone switchboards, conference and interpretation systems
Cleaning	Clean with a slightly damp soft cloth; do not use harsh cleaning agents
Care	Avoid contact with liquids and exposure to extreme temperatures
Spare parts	Contact Sennheiser customer service
Repairability	Contact an authorized Sennheiser technician for any repairs
Package contents	1 HME 45-C headset/microphone set with 5-pin XLR connector

Frequently Asked Questions - HME 45-C SENNHEISER

How to connect the HME 45-C headset to a telephone?

The HME 45-C comes with a 5-pin XLR connector. To connect it, you must use an appropriate adapter matching your telephone's connections. Refer to the wiring diagram on page 28 of the manual.

Does the microphone work without power?

No, the back-electret microphone requires 3.5 to 10 V DC power. It is usually provided by the device you connect it to (telephone, switchboard).

How to adjust the microphone position?

The microphone arm is flexible. Gently bend it to position the capsule about 2 cm from the corner of your mouth. Avoid twisting it excessively.

Can I connect this headset to a computer?

It depends on your computer. If it has a 5-pin XLR input or a suitable adapter, yes. Otherwise, you will need to use a converter or an audio mixer.

What is the difference between the HME 45-C, HME 45 telcom, and HME 45-6 versions?

The HME 45-C has a 5-pin XLR connector, the HME 45 telcom has a 4-pin Western plug (standard 121 TR 9-5), and the HME 45-6 has a free end for wiring.

Is the headset stereo or mono?

The headset is designed for mono listening by default. It can be used in stereo (impedance 300 ohms per channel) but connections must match.

How to clean the headset?

Use a slightly damp soft cloth to wipe the ear pads and headband. Do not use solvents or abrasive products. Avoid getting moisture inside the ear cups.

Is the headset repairable?

Yes, but contact an authorized Sennheiser service center for any repairs to avoid damaging the device.

Can I use this headset with a smartphone?

Not directly, because the XLR connector is not compatible. You will need a specific adapter and suitable microphone power.

Where to find the wiring diagram?

The connection diagram can be found on page 28 of the user manual, downloadable from the Sennheiser website.

USER MANUAL HME 45-C SENNHEISER

Headset for connection to terminals in telephone exchanges and switchboards or to conference and interpretation systems. The headset is supplied with open-ended cable so that the user can choose the connector most suitable for the application. Please refer to page 27 for the wiring diagram.

HME 45-C

Headset for connection to terminals in telephone exchanges and switchboards or to conference and interpretation systems. This headset is supplied with a 5-pin XLR connector. Please refer to page 28 for the pin assignment of the XLR connector.

HME 45 telcom

Headset for connection to terminals in telephone exchanges and switchboards or to telephones with suitable socket (as per 121 TR 9-5 connection standard of the German Telekom). This headset replaces the receiver and leaves your hands free. Please refer to page 29 for the wiring diagram.

HMD 45-6

Headset with dynamic microphone. No external supply voltage necessary. The headset is supplied with open-ended cable so that the user can choose the connector most suitable for the application. Please refer to page 27 for the wiring diagram.

Connection of the HME 45 telcom to a telephone

In the ideal case, your telephone is fitted with a suitable socket for connecting the headset. Such a socket resembles the socket for the spiral cord of the receiver and is unconnected. Some manufacturers use a headphone symbol for it, others the designation „121 TR 9-5".

Connect the cable of your HME 45 telecom headset to this socket (see fig. 1).
The receiver remains on the cradle. You need it as a „switch“ at the beginning and the end of your phone call.

Please note for the HME 45 telcom

If your telephone has a headset socket not corresponding to the 121 TR 9-5 standard of the German Telekom, you have to have an adaptor made, or you have to use a new plug. Figure ② shows the wiring arrangement.

2

Some telephones (especially from German manufacturers) have a receiver socket suitable for the headset. In particular, this socket is able to supply the necessary operating voltage for the condenser microphone.

Please ask your telephone manufacturer whether you can directly connect a headset (fig. 3). He will need the circuit diagram and the technical data of your Sennheiser headset. Please photocopy pages 10 and 29 of these operating instructions for him.

3

Adjusting the microphone boom

Adjusting the headband

Cable and microphone on the left or the right

Cable on the left

Cable on the right

Technical data

Headphone

Transducer principle

Frequency response

Impedance

THD

dynamic, open

20 Hz - 18 kHz

mono: 150 stereo: 300 per side

< 1 %

Microphone

Transducer principle

Frequency response

(2 cm distance between mic and corner of mouth)

Output voltage

Operating voltage

HME 45-6 / HME 45-C / HME 45 telcom

noise-cancelling back-electret condenser microphone capsule

100Hz - 5kHz

HME 45 telcom: -40 dBV/Pa as per 121 TR 9-5

HME 45-6/ -C: -35 dBV/Pa

HME 45 telcom: 5 V DC

HME 45-6/ -C:3.5-10 V DC

Microphone

Transducer principle

Frequency response

(2 cm distance between mic and corner of mouth)

Output voltage

Impedance

HMD 45-6

Dynamic microphone

50Hz - 12kHz

0.5mV / Pa

200Ω

Other

Contact pressure

Weight (without cable)

Cable

Connector

approx. 1.6N

140g

single-sided, total length 1.8m

HME 45 telcom: 4-pin western connector

HME 45-C: 5-pin XLR connector

HME 45-6: open-ended cable

HMD 45-6: open-ended cable

1 headset

Supply schedule

Product variants

HME 45 telcom: 4-pin western connector

HME 45-C: 5-pin XLR connector

HME 45-6: open-ended cable

HMD 45-6: open-ended cable

HME 45-C: spina XLR a 5 poli

HME 45-C: spina XLR a 5 poli

HME 45telcom: 5 V DC

HME 45-6/ -C:3,5-10 V DC

Microfoon

Omezetprincipipe

headphone headphone capsule, capsule, left right

HME 45-6

headphone headache capsule, capsule, left right

Stromlaufplan

circuit diagram

Printed in Germany Publ. 2/98

59377/A03