Sennheiser MM 50 User Manual

Set 55 TV

Instructions for use

Set 50 TV

A

B

C

A

B

C

Contents

Safety instructions .......................................................................... 2

The Set 50 TV/Set 55 TV stethoset receiver system ...................... 3

Set 50 TV: Delivery includes ............................................................ 3

Set 55 TV product variant .................................................................... 4

Operating controls ........................................................................... 4

Receiver (see inside cover) .................................................................. 4

Transmitter (see inside cover) ............................................................ 4

LED indications (see inside cover) ...................................................... 4

Connection possibilities (see inside cover) ...................................... 4

Putting the system into operation ................................................. 5

Setting up the transmitter .................................................................. 5

Connecting the transmitter to the sound source ............................ 6

Connecting the transmitter to the mains ......................................... 8

Inserting and removing the receiver’s rechargeable battery ....... 8

Inserting a spare rechargeable battery into the

transmitter’s charging compartment ................................................ 8

Using the system components ....................................................... 9

Switching the transmitter on .............................................................. 9

Switching the stehoset receiver on .................................................... 9

Adjusting the volume ........................................................................... 9

Adjusting the balance ......................................................................... 10

Storing and charging the receiver .................................................... 10

Meaning of the LEDs ...................................................................... 11

LEDs on the transmitter ..................................................................... 11

Care and maintenance ................................................................... 12

Cleaning the system ............................................................................ 12

Cleaning the ear cushions .................................................................. 12

If problems occur... ........................................................................ 13

Accessories ..................................................................................... 14

Connector assignment .................................................................. 14

Specifications ................................................................................. 15

Manufacturer Declarations ........................................................... 16

Thank you for choosing Sennheiser!
We have designed this product to give you reliable operation over

many years. Over 60 years of accumulated expertise in the design and
manufacture of high-quality electro-acoustic equipment have made
Sennheiser a world-leading company in this field.

Please take a few moments to read these instructions carefully, as we
want you to enjoy your new Sennheiser products quickly and to the
fullest.

1

Safety instructions

y Please read these instructions carefully and completely

before using the system.

y Make these instructions easily accessible to all users at all

times. Always include these instructions when passing the
system on to third parties.

y Do not wear the headphones in situations which require

special attention (e.g. when performing skilled jobs).

y Always keep the system dry and do not expose it to extreme

temperatures (ideally 10-35°C).

y Use the system with care and set it up in a clean, dust-free

environment.

y Varnish or furniture polish may degrade the rubber feet of

the transmitter, which could stain your furniture. You should
therefore place the transmitter on a non-slip pad to avoid
potential staining of furniture.

y This system allows you to set higher volumes than

conventional stethoset systems. This can cause hearing
damage in persons with healthy hearing and especially in
children.

y Please observe the safety instructions for NiMH rechargeable

batteries on the enclosed leaflet.

Intended use of the system

Intended use includes:
y having read these instructions, especially the chapter

“Safety instructions”.

y using the system within the operating conditions as

described in these instructions.

Improper use

Improper use means use of the system other than as described
in these instructions or under operating conditions which differ
from those described in these instructions.

2

The Set 50 TV/Set 55 TV stethoset receiver system

The Set 50 TV/Set 55 TV is a cordless infra-red stethoset
receiver system with which you can adjust the volume of your
TV, radio, personal stereo and other hi-fi equipment to suit your
individual needs. In addition, the system allows you to move
around freely without the constrictions of cables within the
room where the transmitter is placed..

The Set 50 TV/Set 55 TV is particularly easy and intuitive to
operate. The volume can be adjusted directly on the receiver.

The transmitter has an integrated charging compartment for
storing the receiver and simultaneously charging the receiver’s
rechargeable battery. In addition, a spare rechargeable battery
can be charged in the small charging compartment at the side
of the transmitter.

Set 50 TV: Delivery includes

Delivery of the Set 50 TV stethoset receiver system includes:

y 1 RI 50 stethoset receiver
y 1 TI 50 transmitter with integrated charging compartment
y 1 BA 151 NiMH rechargeable battery
y 1 mains unit
y 1 connecting cable fitted with two 3.5 mm stereo jack plugs

for connection to headphone socket
(with one adapter to 1/4“ (6.3 mm) jack socket)

y 1 adapter RCA socket (e.g. TB/Aux-Out)

2 pairs of replacement ear cushions

y
y Instructions for use

3

Set 55 TV product variant

The scope of delivery of the Set 55 TV variant is identical to the
delivery of the Set 50 TV but includes:

y 1 RI 55 stethoset receiver
y 1 TI 55 transmitter with integrated charging compartment
y 2 BA 151 NiMH rechargeable batteries

Operating controls

A

Receiver (see inside cover)

 On/Off/volume control
 Compartment for BA 151 rechargeable battery
 Balance control

B

Transmitter (see inside cover)

 3.5 mm stereo jack socket labeled AUDIO INPUT

(marked blue) for connection of sound source

 DC socket labeled 12 V (marked yellow) for connection

of mains unit

 Charging compartment for receiver
 Charging compartment for spare rechargeable battery

B

LED indications (see inside cover)

 Charging control LED for spare rechargeable battery
 Charging control LED for receiver

rechargeable battery

 Operation indication

C

Connection possibilities (see inside cover)

 Connecting cable for headphone socket
 Adapter to 1/4“ (6.3 mm) jack socket
 Adapter (RCA socket)
 SCART adapter (optional)
 Mains connector

4

Putting the system into operation

Setting up the transmitter

왘 Place the transmitter so that there are no obstacles in the

light path between transmitter and receiver.

Note:

Avoid exposure to direct sunlight. Direct sunlight may
interfere with the reception and may damage the
transmitter.

If you use a plasma TV screen, please observe the following to
ensure interference-free reception:

y Make sure that the transmitter’s infrared light beam is

pointed directly at the receiver and that the light path
between transmitter and receiver is not obstructed.

y If necessary, use a standard extension cable (3.5 mm stereo

jack plug) to reduce the distance between transmitter and
receiver. This extension cable is available from your
Sennheiser dealer.

5

Connecting the transmitter to the sound source

왘 Plug in one end of the connecting cable  to the blue

AUDIO INPUT socket  on the transmitter.

왘 Check the connection possibilities of your sound source (e.g.

TV).

A B C D

audio out

headphone socket

TV TV

AV

No socket

LR

Headphone
socket

Connecting the transmitter via the headphone socket

A

왘 Plug in the other end of the connecting cable  to the

headphone socket on your sound source.

왘 Adjust the volume of the headphone socket on your sound

source to a medium level. This improves the quality of
cordless sound transmission.
If necessary, check the menu setting of your TV.

Note:

With most TVs, the headphone socket is located at the front
or sides. Depending on the socket, you may have to use the
adapter .

In order to prevent damage to hearing, newer TVs often have a
function that mutes the TV sound as soon as headphones are
connected.

왘 If another person wants to listen to the TV sound via the

loudspeaker, deactivate the muting function via the TV menu
setting.

RCA sockets SCART socket External

microphone

6

a

udio out

RCA socket

L

Connecting the transmitter via the RCA sockets

B

왘

Connect the connecting cable to the adapter (RCA socket).

R

왘 Connect the red and white RCA connectors of the adapter 

to the matching red and white RCA sockets on your sound
source.

Note:

With most TVs, the RCA sockets are located at the rear.

Connecting the transmitter via the SCART socket

C



If your sound source has a SCART socket, you can order the
suitable SCART adapter (see “Accessories” on page 14) from
your Sennheiser dealer.

왘 Connect the connecting cable  to the SCART adapter .
왘 Plug in the SCART adapter  to the SCART socket on your TV.

If your TV has several SCART sockets, select a SCART socket
that is also an output (for details, see operating manual of
your TV).

Using an external microphone

D

If your sound source doesn’t have a headphone or audio output,
SCART or RCA socket, you can use your system together with an
external microphone (see “Accessories” on page 14).

왘 Connect the microphone to the blue socket AUDIO INPUT 

on the transmitter.

왘 Position the microphone in front of the loudspeaker of your

sound source. You can change the sound by varying the
position of the microphone in front of the loudspeaker.

7

Connecting the transmitter to the mains

왘 Connect the mains unit to the yellow socket (12 VDC)  on

the transmitter.

왘 Plug the mains connector into a wall socket.

The LED  lights up green. If the receiver is stored in the
transmitter’s charging compartment , the LED  goes off.

Note:

Pull the mains connector out of the wall socket when the
transmitter will not be used for extended periods of time
(e.g. when you are on holiday). In this case, however, the
rechargeable battery will not be recharged.

Inserting and removing the receiver’s rechargeable battery

왘 Insert the battery into the compartment  as shown on the

left. Make sure that the battery is inserted correctly.

왘 To remove the battery, use the finger catch projection to pull

the battery out of the receiver.



Note:

The receiver is delivered with the battery inserted.

y

y

Charge the battery for at least 3 hours before you use it for
the first time (see “Storing and charging the receiver” on
page 10).

Inserting a spare rechargeable battery into the transmitter’s charging compartment





8

You can charge a spare battery (not included in the delivery of
the Set 50 TV) in the charging compartment  at the side of
the transmitter. This spare battery is not required for operating
the Set 50 TV/Set 55 TV but offers extended listening time
while the discharged first battery is being recharged.

왘 Insert the spare battery into the charging compartment 

as shown on the left.

왘 If the rechargeable battery is inserted correctly, the LED 

lights up red. The red LED  does not go off when the
battery is fully charged.

Using the system components

Switching the transmitter on

왘 Take the stethoset receiver out of the transmitter’s charging

compartment . The transmitter automatically switches on.
The LED  lights up green.

Note:

If the receiver is placed into the transmitter’s charging
compartment , the transmitter automatically switches off.
The LED  goes off.

Switching the stehoset receiver on

Attention!

왘 Turn the volume control  in the direction of the arrow until

it clicks.

왘 Before putting the receiver on, use the volume control  to

adjust the volume to a low level. This protects your hearing
from damage.

왘 Put the receiver on the correct way round, with the



Sennheiser logo at the front.

Volume up? - No!

When people use headphones, they tend to choose
a higher volume than with loudspeakers. Listening
at high volume levels for long periods can lead to
permanent hearing defects. Please protect your
hearing, Sennheiser headphones also sound
exceptionally good at low volumes.

Adjusting the volume

왘 If the transmitter is connected to a headphones socket of

your sound source:
Adjust the volume of the sound source to a medium level.
This improves the quality of cordless sound transmission.

왘 Use the volume control  to adjust the volume to a

sufficient and comfortable level.

9

Adjusting the balance

The Set 50 TV/Set 55 TV features a balance control for right/left

쐋

volume adjustment.

왘 Use the balance control  to adjust the volume so that you

hear equally well with both ears.

Storing and charging the receiver

Do not store your receiver on a glass dummy head, chair
armrest, or similar for long periods of time as this can reduce
the contact pressure of the earbows.

왘 To switch the receiver off, turn the volume control 

backwards until it clicks.

왘 After use, place the receiver into the transmitter’s charging

compartment  as shown on the left, without exerting too
much pressure. The transmitter automatically switches off.



왘 If the receiver is placed correctly into the charging

compartment, the LED  lights up red and the battery is



being charged. The red LED  does not go off when the
battery is fully charged.

Charge the battery for at least 14 hours before you use it for

왘

the first time
time is approx. 9 hours.

. With a fully charged battery, the operating

10

Note:

Always store the receiver in the transmitter’s charging
compartment  to ensure that it is fully charged. The
intelligent battery charging technology prevents over­charging.

Meaning of the LEDs

LEDs on the transmitter

LED Status Meaning

Operation indication  lit green The transmitter is

switched on.
The receiver is not
stored in the trans­mitter’s charging
compartment .

off The transmitter is

switched off.
The receiver is
stored in the trans­mitter’s charging
compartment .

Charging control LED of
spare rechargeable
battery 

Charging control LED of
receiver rechargeable
battery 

lit red Spare rechargeable

battery or
rechargeable
battery is being
charged

11

Care and maintenance

Cleaning the system



Attention!

왘 Before cleaning, disconnect the transmitter from the mains.
왘 Only use a slightly damp cloth to clean the units. Do not use

any cleansing agents or solvents.

Liquids can damage the electronics of the units!
Liquids entering the housing of the units can cause

a short-circuit and damage the electronics.

왘 Keep all liquids far away from the units.

Cleaning the ear cushions

왘 Carefully remove the ear cushions  from the receiver.
왘 Clean the ear cushions  with warm soapy water and rinse

thoroughly.

왘 Dry the ear cushions  before putting them back on the

receiver.

Note:

For reasons of hygiene, the ear cushions  should be
replaced from time to time. Please order the ear cushions
from your Sennheiser dealer.

12

If problems occur...

왘 Check if the problem you face is listed in the table below:

Problem Possible cause Page

You cannot
hear anything

You hear the
sound only
with one ear

The
rechargeable
battery is not
being charged

y Are all jack plugs connected correctly?
y Is the transmitter connected to the

sound source?

y Is the transmitter connected to the

mains?

y Is the volume of the sound source

sufficient?

y Is the green operation indication lit?
y Is the volume of the receiver

sufficient?

y Is the rechargeable battery fully

charged and inserted properly into
the receiver?

y Do you wear the receiver the right

way round, with the Sennheiser logo
at the front?

y Is there a free line of sight between

transmitter and receiver?

y Is the balance adjusted correctly? 10

y Is the receiver switched off during

charging?

6 ff
6 ff

8

6

8
9

8

9

5

10

If problems occur that are not listed in the above table or if the
problems cannot besolved with the proposed solutions, please
contact your local Sennheiser agent for assistance.

13

Accessories

Attention!

The following accessories are available from your authorized
Sennheiser dealer:

Components from other manufacturers (e.g. for
power supply or rechargeable battery) may cause
damage to the unit and will invalidate the
warranty.

왘 Only use original Sennheiser accessories and

spare parts.

BA 151 spare rechargeable battery Cat. No. 004146

Ear cushions (normal), 5 pairs Cat. No. 517625

Ear cushions (lamellar form), 5 pairs Cat. No. 517626

SCART adapter Cat. No. 077798

3 m extension cable

(3.5 mm stereo jack plug)

MKE 800 TV-N

external microphone (mono)

Cat. No. 517627

Cat. No. 500974

Connector assignment

14

The blue socket AUDIO INPUT  is designed for use with two
different connector types (Line/Mic). The connector type used
is identified automatically.

3.5 mm 3-pole jack/standard stereo

L R GND

3.5 mm 4-pole jack/microphone with additional power supply

L R GND8V

1kΩ

Specifications

System

Modulation FM mono
Carrier frequencies 2.3 MHz
Range approx 12 m within a room
AF frequency response 50 Hz–12 kHz
THD < 1 %

Transmitter

Audio /microphone connection 3.5 mm stereo jack socket
Charging time of

rechargeable battery
Power supply 12 VDC/200 mA

Weight approx. 90 g
Dimensions approx. 95 x 130 x 30 mm

Receiver

Max. SPL 120 dB (SPL)
Power supply via BA 151 NiMH rechargeable

Operating time approx. 9 hours
Weight approx. 55 g
Dimensions approx. 200 x 150 x 20 mm

approx. 14 hours

via NT 5 mains unit

battery (2.4 V / 80 mAh)

15

Manufacturer Declarations

Warranty regulations

The guarantee period for this Sennheiser product is 24 months from the date of
purchase. Excluded are accessory items, rechargeable batteries that are
delivered with the product; due to their characteristics these products have a
shorter service life that is principally dependent on the individual frequency of
use.

The guarantee period starts from the date of original purchase. For this reason,
we recommend that the sales receipt be retained as proof of purchase. Without
this proof (which is checked by the responsible Sennheiser service partner) you
will not be reimbursed for any repairs that are carried out.

Depending on our choice, guarantee service comprises, free of charge, the
removal of material and manufacturing defects through repair or replacement
of either individual parts or the entire device. Inappropriate usage (e.g.
operating faults, mechanical damages, incorrect operating voltage), wear and
tear, force majeure and defects which were known at the time of purchase are
excluded from guarantee claims. The guarantee is void if the product is
manipulated by non-authorised persons or repair stations.

In the case of a claim under the terms of this guarantee, send the device,
including accessories and sales receipt, to the responsible service partner. To
minimise the risk of transport damage, we recommend that the original
packaging is used.

Your legal rights against the seller, resulting from the contract of sale, are not
affected by this guarantee. The guarantee can be claimed in all countries
outside the U.S. provided that no national law limits our terms of guarantee.

CE Declaration of Conformity

This equipment is in compliance with the essential requirements and other
relevant provisions of Directive 89/336/EC. The declaration is available on the
internet site at www.sennheiser.com.

Before putting the device into operation, please observe the respective country­specific regulations!

16

Rechargeable batteries

The supplied rechargeable batteries can be recycled. Please dispose of
them as special waste or return them to your specialist dealer. In
order to protect the environment, only dispose of exhausted
rechargeable batteries.

WEEE Declaration

Your Sennheiser product was developed and manufactured with
high-quality materials and components which can be recycled and/or
reused. This symbol indicates that electrical and electronic equipment
must be disposed of separately from normal waste at the end of its
operational lifetime.

Please dispose of this product by bringing it to your local collection point or
recycling centre for such equipment. This will help to protect the environment
in which we all live.

Sennheiser electronic GmbH & Co. KG
30900 Wedemark, Germany
Phone [phone]
Fax [phone]
www.sennheiser.com

Printed in China Publ.

10/06 517640 / A02