Sennheiser TV Receiver 840 S User Manual

Wireless TV Listening System  
Set 840 S  
Instruction manual  
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II  
I
1
D
5
6
5
8
2
3
C
4
7
9
B
0
A
R
I
H
G
F
E
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Contents  
Contents  
Putting the Set 840 S system into operation ......................... 6  
Adjusting the balance ........................................................ 18  
Switching between mono and stereo operation ............... 18  
... this indicator lights up? .................................................. 22  
... you change the position of this control/switch? ........... 23  
... you hear acoustic signals or warning signals? .............. 24  
Cleaning the Set 840 S system ............................................... 25  
Cleaning the transmitter and the receiver ........................ 25  
If a problem occurs ... .............................................................. 26  
Additional technical information ........................................... 28  
Accessories and spare parts ................................................... 30  
Specifications ........................................................................... 32  
Manufacturer Declarations ..................................................... 34  
Index ......................................................................................... 36  
1
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Safety instructions  
Safety instructions  
Please read this instruction manual carefully and completely before  
using the products.  
Make this instruction manual easily accessible to all users at all  
times. Always include this instruction manual when passing the  
products on to third parties.  
Do not use the products in situations which require special atten-  
tion (e.g. when performing skilled jobs).  
Always keep the products dry and do not expose them to extreme  
temperatures.  
Use the products with care and set them up in a clean, dust-free  
environment.  
Varnish or furniture polish may degrade the 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.  
Always maintain a distance of at least 3.94“ (10 cm) between the  
ear cups and the cardiac pacemaker or implanted defibrillator since  
the product generates permanent magnetic fields.  
This stethoset receiver allows you to set higher volumes than  
conventional headphones. This can cause hearing damage in  
persons with healthy hearing and especially in children.  
Refer all servicing to qualified service personnel. Servicing is  
required when the apparatus has been damaged in any way, such  
as power supply cord or plug is damaged, liquid has been spilled or  
objects have fallen into the apparatus, when the apparatus has  
been exposed to rain or moisture, does not operate normally, or has  
been dropped.  
WARNING: To reduce the risk of fire or electric shock, do not expose  
the products to rain or moisture.  
Use only the supplied mains unit.  
Disconnect the mains connector from the wall socket  
– to completely disconnect the products from the mains,  
– during lightning storms or when unused for long periods of time.  
Ensure that the mains unit is  
– always readily operable and easily accessible,  
– properly plugged into the wall socket,  
– not covered or exposed to direct sunlight for longer periods of  
time in order to prevent heat accumulation,  
– only operated within the permissible temperature range (see  
“Specifications” on page 32),  
– not operated near heat sources.  
2
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Safety instructions  
Intended use  
Intended use includes  
having read this instruction manual, especially the chapter “Safety  
instructions” on page 2,  
using the products within the operating conditions and limitations  
described in this instruction manual.  
“Improper use” means using the products other than as described in  
this instruction manual, or under operating conditions which differ  
from those described herein.  
Safety instructions for the Lithium-Polymer rechargeable battery  
The BA 300 is a Lithium-Polymer rechargeable battery. If abused or  
misused, this rechargeable battery may be damaged. Please under-  
stand that Sennheiser does not accept liability for damage arising from  
abuse or misuse.  
WARNING! In extreme cases, the rechargeable battery may even  
present a  
heat hazard,  
fire hazard,  
explosion hazard,  
smoke and gas hazard.  
Only charge rechargeable  
batteries with the appro-  
priate Sennheiser char-  
gers.  
Do not heat above 70°C/  
158°F, e.g. do not expose to  
sunlight or throw into a fire.  
Return defective  
When not using the  
devices or exhausted  
rechargeable batteries to  
your specialist dealer.  
rechargeable battery for  
extended periods of time,  
charge it regularly (every  
6 months for about 1 hour).  
Do not short-circuit.  
Only charge rechargeable  
batteries at ambient  
temperatures between  
10°C/50°F and 40°C/104°F.  
Do not mutilate or  
dismantle.  
Do not charge the recharge-  
able battery if the device is  
obviously defective.  
Store the devices/  
Do not expose to moisture.  
rechargeable batteries in  
a cool and dry place at  
room temperature.  
3
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Delivery includes  
Delivery includes  
The Set 840 S system is available as an EU and a US version.  
The following table shows which items are included with  
the respective version.  
Components of the Set 840 S system  
EU US  
1
1
1
RR 840 S receiver with BA 300  
Lithium-Polymer rechargeable battery  
TR 840 transmitter with integrated  
charging compartments  
NT 9-3AW mains unit with  
2 country adapters (EU, UK)  
1 country adapter (US)  
1
connection cable   
with two 3.5 mm stereo jack plugs   
for connection to a headphone socket  
1
1
audio adapter   
(3.5 mm to ¼” (6.3 mm) jack plug)  
audio adapter for RCA socket   
(e.g. TB/Aux-Out)  
1
1
1
1
1
1
1
audio adapter for SCART socket  
MKE 800 TV-N microphone  
EZT 3011 induction loop  
lanyard  
clip for attaching the receiver  
instruction manual  
installation manual  
4
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Product overview  
Product overview  
The overview pictures of the receiver and the transmitter  
can be found on the inside front cover of this instruction  
manual.  
Receiver  
I
1 Channel indicator  
2 Volume control  
3 On/off button  
4 Balance control  
5 Socket for headphones, induction loop or  
connection cable to hearing aid  
6 Channel search button  
7 Battery compartment  
R Induction loop  
Transmitter  
II  
8 Charging compartment for receiver  
9 Charging compartment for optional spare  
rechargeable battery  
0 Charging indicator for optional spare  
rechargeable battery  
A Charging indicator for receiver’s rechargeable  
battery  
B Operation indicator  
C “Speech intelligibility” button  
D Indicator for the selected speech intelligibility  
E Socket (marked blue) for connection of sound  
source or external microphone  
F ST/MO slide switch (stereo/mono)  
G Treble adjustment control  
H Channel selector switch  
I DC socket (marked yellow) for connection of  
mains unit  
5
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Putting the Set 840 S system into operation  
Putting the Set 840 S system into  
operation  
Setting up the transmitter  
̈ Choose a suitable place near your sound source (e.g. TV).  
̈ Do not place the transmitter close to metal objects such  
as shelf bars, reinforced concrete walls, etc. as this can  
decrease the transmitter’s range.  
It is not necessary that the transmitter and receiver are in  
the same room, so you can move around freely in the home  
or outside in the garden.  
When the receiver leaves the range of the transmitter, it  
produces warning signals and then automatically switches  
off after 3 minutes.  
One transmitter can be used to transmit to several  
receivers on the same frequency.  
6
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Putting the Set 840 S system into operation  
Connecting the transmitter to a sound source  
̈ Switch your sound source (e.g. TV) off before connecting  
the transmitter.  
E
J
̈ Plug one end of the connection cable J into the blue  
socket E of the transmitter.  
̈ Check the available connection possibilities of your  
sound source (e.g. TV):  
Connection possibility Name of connection possibility  
Headphone socket  
RCA socket  
A
B
C
L
R
SCART socket  
(SCART adapter included with the  
EU version)  
What if your sound source doesn’t have any of these  
connection possibilities?  
MKE 800 TV-N external  
microphone  
(included with the US version)  
D
̈ Connect the transmitter as described in the corre-  
sponding chapter or  
,
,
.
A
B
C
D
If possible, use the SCART connection  
.
C
SCART adapter and microphone are also available as  
accessories (see page 30).  
7
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Putting the Set 840 S system into operation  
Connecting the transmitter to a headphone socket  
A
̈ Plug the other end of the  
connection cable J into the  
headphone socket on your  
sound source.  
K
J
Is the plug on the connection  
cable too small for the head-  
phone socket?  
̈ Plug the adapter to ¼”  
(6.3 mm) jack socket K onto  
the connection cable J  
.
̈ Adjust the volume of the headphone socket on your  
sound source to a medium level.   
This improves the quality of wireless sound transmis-  
sion. For detailed information, please refer to the  
instruction manual of your sound source (e.g. TV).  
With most TVs, the headphone socket is located at  
the front or sides.  
Connecting the transmitter to an RCA socket  
B
̈ Plug the audio adapter for  
RCA socket L onto the  
connection cable J.  
L
̈ Connect the red connector of  
the audio adapter L to the  
red RCA socket R of your  
sound source.  
J
̈ Connect the white connector  
of the audio adapter L to the  
white or black RCA socket L of  
your sound source.  
With most TVs, the RCA socket is located at the rear.  
If your TV has several RCA sockets, use the socket  
RCA output.  
8
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Putting the Set 840 S system into operation  
Connecting the transmitter to a SCART socket  
C
̈ Plug the SCART adapter M  
M
J
onto the connection cable J.  
̈ Connect the SCART adapter M  
to the SCART socket on  
your TV.  
If your TV has several SCART sockets, use the socket  
SCART output.  
Using the MKE 800 TV-N external microphone  
D
What if your sound source doesn’t have any of the connec-  
tions mentioned above? You can then use the optional  
MKE 800 TV-N microphone.  
What if your sound source mutes the external loud-  
speakers if you use one of the connections mentioned  
above?  
̈ Via the operating menu of your TV, check if the muting  
can be deactivated.  
̈ If the muting persists, use the optional MKE 800 TV-N  
microphone instead of the connection cable.  
E
9
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Putting the Set 840 S system into operation  
To connect the MKE 800 TV-N microphone:  
̈ If possible, adhere the supplied Velcro tape directly in  
front of the loudspeaker of your TV.  
̈ Press the microphone onto the Velcro tape.  
̈ Connect the jack plug of the microphone to the blue  
socket E of the transmitter.  
You can change the sound by varying the position of  
the microphone in front of the loudspeaker.  
10  
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Putting the Set 840 S system into operation  
Connecting the transmitter to the mains  
The EU and UK country adapters are included with the  
EU version of the Set 840 S; the US country adapter is  
included with the US version of the Set 840 S.  
̈ Slide the supplied country  
N
adapter O onto the mains  
unit N.  
̈ Connect the yellow connector  
of the mains unit to the yellow  
socket I of the transmitter.  
EU  
UK  
US  
O
̈ Plug the mains unit N into a  
I
wall socket.  
The operation indicator B  
on the transmitter lights up  
green.  
N
When connecting the transmitter to the mains for  
the first time, charge the rechargeable battery for  
3 hours as described in the chapter “Storing and  
charging the receiver” on page 20.  
3h  
If there is no audio signal from the sound source for  
about 3 minutes, the transmitter automatically  
switches off. The operation indicator B goes off.  
To disconnect the transmitter from the mains, pull  
out the mains connector from the wall socket.  
When not using the transmitter for extended periods  
of time (e.g. when you are on holiday), pull out the  
mains connector from the wall socket. In this case,  
however, the receiver’s rechargeable battery will not  
be recharged.  
11  
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Putting the Set 840 S system into operation  
Connecting the induction loop or headphones  
for hearing aids to the receiver  
The socket 5 of the receiver allows you to connect  
• the supplied induction loop R,  
• headphones or  
• a connection cable to your hearing aid or to induction  
couplers.  
Connecting the induction loop  
̈ Carefully remove the clip P from the receiver.  
̈ Attach the clip of the induction loop as shown.  
̈ Connect the induction loop R to the socket 5 of the  
receiver.  
5
R
̈ Set your hearing aid to position “T”.  
If your hearing aid has no position “T”, please contact your  
hearing aid acoustician.  
For alternative connection possibilities to your  
hearing aid as well as the connection to cochlea  
implants, please contact your hearing aid acoustician.  
12  
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Putting the Set 840 S system into operation  
Connecting headphones  
5
̈ Connect the 3.5 mm jack plug of the headphones to the  
socket 5 of the receiver.  
Wearing the receiver  
In order to wear the receiver, you can use the supplied  
lanyard Q  
,
the clip P or the supplied induction loop R.  
The induction loop is suitable for users of hearing aids, the  
lanyard and the clip are useful if you are using headphones  
.
Wearing the receiver around the neck  
If you want to wear the receiver around your neck, use  
• the supplied lanyard Q or  
• the connected induction loop R (where applies).  
To attach the lanyard Q:  
̈ Connect the fasteners of the  
lanyard Q to the metal ring  
at the rear of the receiver.  
Q
̈ Wear the receiver around your  
neck, with the Sennheiser logo  
facing away from your body.  
13  
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Putting the Set 840 S system into operation  
Attaching the receiver to clothing or belt  
If you want to attach the receiver to your clothing or belt,  
use the attachment clip P.  
To attach the receiver:  
P
̈ Attach the clip P to your  
clothing or belt.  
To remove the receiver:  
̈ Pull the clip P with the receiver  
away from your clothing or belt.  
14  
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Using the Set 840 S system  
Using the Set 840 S system  
To switch the Set 840 S system on, proceed as follows:  
Sequence of steps  
Page  
15  
1. Switch your sound source (e.g. TV) on.  
2. Adjust the volume on the receiver to a low level. 16  
3. Switch the receiver on.  
16  
16  
4. Adjust the desired volume on the receiver.  
5. If necessary, set a different channel on the  
transmitter.  
17  
To switch the transmitter on:  
̈ Switch your sound source on.   
The transmitter automatically switches on. The opera-  
tion indicator B lights up green.  
If the transmitter doesn’t switch on:  
̈ Read the corresponding chapter on page 26.  
To switch the transmitter off:  
̈ Switch your sound source off.   
The transmitter automatically switches off after  
3 minutes. The operation indicator B goes off.  
15  
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Using the Set 840 S system  
Switching the receiver on/off  
CAUTION! Hearing damage due to high volumes!  
This receiver allows you to set higher volumes  
than conventional devices. This can cause  
hearing damage in persons with healthy  
hearing and especially in children.  
̈ Before using the receiver, set the volume on  
the receiver to a low level.  
̈ Do not continuously expose yourself to  
high volumes.  
To switch the receiver on:  
1
̈ Keep the on/off button 3  
pressed until the channel indi-  
cator 1 lights up.  
The channel indicator 1 goes off  
3
after 30 seconds.  
To switch the receiver off:  
̈ Keep the on/off button 3 pressed until the channel  
indicator 1 goes off.  
If you are not within the range of the transmitter, the  
receiver automatically switches off after 3 minutes.  
Adjusting the volume  
̈ Use the volume control 2 to  
adjust the volume to a suffi-  
cient and comfortable level.  
16  
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Using the Set 840 S system  
Searching for a sound source  
̈ Switch the receiver on.  
The receiver automatically searches for one of the  
3 channels of the transmitter and starts the channel  
search on the last selected channel. If a channel is found,  
the channel search stops.   
Your hear the sound of the sound source found.   
Depending on the channel found, the receiver produces  
1, 2 or 3 beeps (see page 24) and the channel  
indicator 1 on the receiver lights up as follows:  
The channel indicator 1 goes off after 30 seconds so  
that the light won’t disturb you in a dark room.  
What if you don’t hear the desired sound source?  
source (e.g. from another nearby system).  
To continue the channel search:  
6
̈ Press the channel search  
button 6 on the receiver repeat-  
edly until you have found your  
sound source.  
If you still cannot find your sound source:  
̈ Change the transmission channel as described in the  
next chapter.  
̈ Read the chapter “If a problem occurs ...” on page 26.  
Changing the transmission channel  
If several transmitters are operated simultaneously and are  
very close to one another, reception can be subject to inter-  
ference (e.g. hissing noise).  
17  
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Using the Set 840 S system  
̈ Change, if necessary several  
times, the position of the  
channel selector switch H on  
the transmitter to change to  
an interference-free channel.  
You can choose between 3  
channels.  
H
̈ Press the channel search button 6 on the receiver to  
re-start the channel search.  
If reception is still subject to interference:  
̈ Read the chapter “If a problem occurs ...” on page 26.  
Adjusting the balance  
The balance control allows for right/left  
volume adjustment. Adjust the balance  
so that you hear equally well with both  
ears.  
4
̈ Turn the balance control 4 to the  
left L or right R in order to increase  
the volume for the corresponding  
ear.  
Switching between mono and stereo operation  
If, despite a correct balance adjustment, you can hear the  
sound only with one ear:  
̈ Set the ST/MO switch F  
on the transmitter to MO  
(mono).  
F
18  
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Using the Set 840 S system  
Meaning of the terms “mono” and “stereo”  
Stereo (ST)  
Mono (MO)  
L
R
L + R  
Example: L: Speech from the left   
R: Music from the right  
You hear speech from the  
left and music from the  
right.  
You hear speech and music  
coming from the front.  
Individually enhancing the speech intelligibility  
The  
“speech  
intelligibility”  
D
button C allows you to adjust  
the sound to your individual  
needs.  
C
Try out which setting works best  
for you.  
until the sound is optimally adjusted to your needs.  
Press the   
button  
1 x  
2 x  
3 x  
4 x  
Indicator D is  
lit yellow  
Setting  
1
2
3
Default setting  
If necessary, you can have the speech intelligibility fine  
adjusted to your hearing ability (see page 28).  
19  
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Using the Set 840 S system  
Storing and charging the receiver  
̈ After use, place the receiver  
into the transmitter’s char-  
ging compartment 8 without  
exerting too much pressure.  
The receiver automatically  
switches off.  
8
B
A
The Sennheiser logo can face the operation indicator B  
or away from it.  
When the receiver is placed correctly into the charging  
compartment, the indicator A lights up:  
red:  
The battery is being charged.  
green: The battery is fully charged.  
With a fully charged battery, the operating time is up  
to 9 hours.  
The transmitter remains switched on during  
charging. If you have a second receiver, it can be used  
with the transmitter while the discharged first  
receiver is being charged.  
Always store the receiver in the transmitter’s  
charging compartment 8 to ensure that it is fully  
charged. The intelligent battery charging technology  
prevents overcharging.  
20  
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Using the Set 840 S system  
Charging a rechargeable battery in the  
transmitter’s charging compartment  
You can charge the receiver’s rechargeable battery or a  
spare BA 300 rechargeable battery (not included in the  
delivery of the Set 840 S) in the charging compartment9  
at the side of the transmitter.  
The spare battery offers extended listening time while the  
discharged first battery is being recharged.  
Before using the spare rechargeable battery for the  
first time, charge it for at least 3 hours.  
Removing and charging the receiver’s battery  
To remove the receiver’s battery:  
̈ Pull the battery out of the  
receiver’s battery compart-  
ment 7.  
7
̈ Insert the receiver’s battery  
9
into the charging compart-  
ment 9 at the side of the  
transmitter as shown.  
0
When the battery is inserted correctly, the indicator 0  
lights up:  
red:  
The battery is being charged.  
The charging time is approx. 3 hours.  
green: The battery is fully charged.  
̈ Insert the battery into the  
receiver as shown.  
̈ Slide the battery into the  
battery compartment 7 as  
far as it will go.  
7
21  
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What if ...  
What if ...  
... this indicator lights up?  
Indicator  
Channel   
Status  
Meaning  
lit yellow The receiver has just  
been switched on or a  
indicator 1  
on the receiver  
button has just been  
pressed  
.
flashes  
off  
The distance between  
receiver and transmitter  
is too great.   
The receiver switches  
off after 3 minutes.  
The receiver is switched  
on for more than  
has been pressed.  
The receiver is switched  
off.  
Operation  
indicator B   
on the trans-  
mitter  
switched on.  
off  
The transmitter is  
Charging  
indicator A  
lit red  
The rechargeable  
battery is being  
Charging  
indicator 0  
lit green The rechargeable  
battery is fully charged.  
“Speech intelli- lit yellow The speech intelligibility  
gibility” indi-  
cator D on the  
transmitter  
enhancement is  
switched on.  
off  
The speech intelligibility  
enhancement is  
switched off.  
22  
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What if ...  
... you press this button?  
Button  
Function  
Page  
Channel search  
button 6 on the  
receiver  
source or a different channel  
17  
“Speech   
Selects one of the possible  
settings in order to individu-  
ally enhance the speech  
intelligibility  
19  
intelligibility”  
button C  
on the transmitter  
Control/switch  
Function  
Page  
Reduces or increases the  
16  
Volume control 2   
on the receiver  
Increases the volume for the  
18  
17  
Balance control 4   
on the receiver  
Channel selector  
switch H on the  
transmitter  
Selects a different transmis-  
sion channel  
Sets the transmitter to  
mono or stereo operation  
18  
28  
ST/MO switch F  
on the transmitter  
Treble adjustment Treble adjustment is only to  
be made by a hearing aid  
technician / an expert  
control G on the  
transmitter  
23  
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What if ...  
... you hear acoustic signals or warning signals?  
Acoustic signal  
3 ascending beeps  
Meaning  
The receiver has just  
been switched on.  
3
descending beeps The receiver has just  
been switched off.  
1 acknowledgement The channel search  
beep  
button has been  
pressed once briefly  
.
The channel search  
button has been  
pressed for  
5 seconds  
.
1–3 short beeps  
The receiver is set to  
channel 1, 2 or 3  
.
Warning signal  
Meaning  
6 short  
beeps  
The receiver does not  
receive any signal  
from the transmitter:  
• The distance  
between trans-  
mitter and receiver  
is too great.   
The receiver  
switches off after  
3 minutes.  
• The transmitter is  
switched off.  
2 long  
beeps  
The rechargeable  
battery is almost flat.  
24  
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Cleaning the Set 840 S system  
To switch the acoustic signals on and off:  
̈ Press the channel search  
button 6 on the receiver for  
approx. 5 seconds.  
6
You hear a short acoustic  
signal.  
Warning signals cannot be switched off.  
Cleaning the Set 840 S system  
Cleaning the transmitter and the receiver  
CAUTION! Danger of electric shock and damage to the  
device electronics!  
Liquids entering the housing of the devices  
can cause a short-circuit and damage the  
electronics.  
̈ Keep all liquids far away from the devices.  
̈ Do not use any cleansing agents or  
solvents.  
̈ Before cleaning, disconnect the transmitter from the  
mains.  
̈ Use only a slightly damp cloth to clean the devices.  
25  
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If a problem occurs ...  
If a problem occurs ...  
The transmitter does not switch on  
Possible cause  
Solution  
Is the mains unit  
Check the connection of the mains  
connected correctly? unit to the transmitter and to the  
mains (see page 11).  
Is the sound source Switch your sound source on.  
switched on?  
Is the volume of  
the sound source  
sufficient?  
Set the volume on your sound  
source to a medium level.  
You cannot hear anything  
Possible cause  
Solution  
Is the transmitter  
placed close to  
metal objects?  
Choose a different place for the  
transmitter.   
Make sure that the transmitter is  
Are all connectors  
Check the connection between the  
connected correctly? transmitter and your sound source  
(see page 7).  
Is the operation  
indicator B lit?  
Check if the transmitter is switched  
on (see page 15).  
Is the volume of   
the sound source  
sufficient?  
Set the volume on your sound  
source to a medium level.  
Is the volume of the Increase the volume by turning the  
receiver sufficient?  
volume control 2 (see page 16).  
Is the rechargeable Remove the rechargeable battery  
battery inserted  
properly into the  
receiver and fully  
charged?  
and reinsert it into the receiver.   
If this doesn’t help: recharge   
the rechargeable battery   
(see page 20).  
26  
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If a problem occurs ...  
You hear the sound only with one ear  
Possible cause  
Solution  
Is the balance   
adjusted correctly?  
Turn the balance control 4 to the  
left or right (see page 18).  
Is the transmitter  
set to mono?  
Set the ST/MO switch F on the  
transmitter to mono (MO)   
(see page 18).  
The sound of your sound source is hardly intelligible  
Possible cause Solution  
Is the speech intelli- Press the “speech intelligibility”  
gibility enhance-  
ment out of adjust-  
ment?  
repeatedly until the sound is  
optimally adjusted to your needs  
(see page 19).  
Is there another  
transmitter oper-  
ating in the prox-  
imity?  
Change the transmission channel  
(see page 17).  
Is the receiver still  
within the trans-  
mitter’s range?  
Move the receiver closer to the  
transmitter.  
The loudspeakers of your TV are muted  
Possible cause  
Solution  
Some TVs have a  
Via the operating menu of your TV,  
function that mutes check if and how the muting can be  
the loudspeakers  
when you connect a  
transmitter  
deactivated.  
Use a different audio socket on  
your TV or use the MKE 800 TV-N  
external microphone.  
If a problem occurs that is not listed in the above tables or if  
the problem cannot be solved with the proposed solutions,  
please contact your Sennheiser partner for assistance.  
27  
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Additional technical information  
Fine adjusting the speech intelligibility  
The speech intelligibility can be enhanced individually on the trans-  
mitter (see page 19).  
There are the following settings:  
Indicator D lit  
yellow  
Setting  
Fine adjustment  
Default  
No fine adjustment made  
setting  
1
2
3
Compression  
Treble boost  
Compression and treble boost  
Compression (settings 1 and 3)  
Deterioration of the ability to hear quiet sounds as well as loud ones is  
a typical symptom of old age. Compression compensates for these  
volume differences by boosting the volume of quiet sounds and  
reducing the volume of loud sounds if necessary.  
Compression seems to put the speech in the foreground, making it  
easier to understand.  
Compression is self-regulating; once it has been activated, it is not  
necessary to make any other settings.  
Treble boost (settings 2 and 3)  
Another typical age-related phenomenon is the deterioration of the  
hearing with regard to high frequencies. However, high frequencies are  
important for the intelligibility of speech.  
The treble boost makes the speech clearer and easier to understand.  
With the treble boost (settings 2 and 3), additional fine adjustment is  
possible using the treble boost control G at the rear of the transmitter.  
28  
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Additional technical information  
̈ Use a screwdriver to turn the treble  
boost control G to the left or right  
until the sound can be heard very  
well.  
The position “0” corresponds to a  
minimum boost, the position “MAX”  
corresponds to a maximum boost, and  
the control is factory-preset to the  
medium position.  
G
Function of the treble boost control  
By means of the transmitter’s steplessly adjustable treble boost  
control G, the audio signal is boosted as shown in the diagram.  
The treble boost control G allows you to select one of the curves  
shown in the diagram below.  
dB  
20  
“MAX”  
10  
Factory preset  
“0”  
0.1  
1
10  
kHz  
29  
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Accessories and spare parts  
Accessories and spare parts  
CAUTION! Danger of damage to the device!  
Components from other manufacturers (e.g.  
for power supply or rechargeable battery)  
may cause damage to the device and will  
invalidate the warranty.  
̈ Use only original Sennheiser accessories  
and spare parts.  
For the Set 840 S, the following receivers and stethoset  
receivers are available from your specialist dealer:  
Cat. No. Accessory/spare part  
EU version  
502026 RR 840 S receiver  
502025 RR 840 stethoset receiver  
US version  
502014 RR 840 S receiver  
502027 RR 840 stethoset receiver  
30  
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Accessories and spare parts  
The following Set 840 S accessories are available from your  
specialist dealer:  
Cat. No. Accessory/spare part  
500898 BA 300 spare rechargeable battery  
502566 EZT 3011 induction loop  
504061 EZT 3012 induction loop  
003448 EZI 120 induction couplers  
528185 Lanyard  
528184 Clip for attaching the receiver  
517627 Extension cable, 3 m (3.5 stereo jack plug)  
500974 MKE 800 TV-N external microphone (mono)  
502710 L 300 10-10 charger  
HZL connection cables  
001676 HZL 30-6   
(3.5 mm jack plug to 1 mini-plug, 40 cm)  
004658 HZL 30-600  
(3.5 mm jack plug to 1 mini-plug, 60 cm)  
001678 HZL 32-6  
(3.5 mm jack plug to 2 mini-plugs, 40 cm)  
004657 HZL 32-600  
(3.5 mm jack plug to 2 mini-plugs, 60 cm)  
002408 HZL 34-6E  
(3.5 mm jack plug to 1 Euro plug, 40 cm)  
004652 HZL 34-600E  
(3.5 mm jack plug to 1 Euro plug, 60 cm)  
002409 HZL 36-6E  
(3.5 mm jack plug to 2 Euro plugs, 40 cm)  
004653 HZL 36-600E  
(3.5 mm jack plug to 2 Euro plugs, 60 cm)  
31  
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Specifications  
Specifications  
System  
Modulation  
FM, stereo  
Carrier frequencies  
EU version  
US version  
Frequency response  
THD  
863.3/864.0/864.7 MHz  
925.95/926.8/927.5 MHz  
50 Hz–16,000 Hz  
< 1%  
Charging time for   
rechargeable battery approx. 3 hours  
Signal-to-noise ratio  
(1 mV, peak deviation) typ. 70 dB (A)  
Operating temperature 10°C to 40°C  
Transmitter  
RF radiated power  
EU version  
US version  
max. 10 mW (EIRP)  
max. 50 mV/m   
(at a distance of 3 m)  
Range  
EU version  
US version  
up to 100 m  
up to 100 ft  
Audio/microphone   
connection  
3.5 mm stereo jack socket  
Power supply  
9 V  
Max. power consump- 2.4 W (incl. battery and receiver  
tion (transmitter in charging and with switched-on  
conjunction with the transmitter)  
NT 9-3AW mains unit)  
Max. current   
consumption  
EU version  
80 mA (w/o battery charging)  
70 mA (w/o battery charging)  
US version  
Standby consumption approx. 0.5 W   
(w/o battery charging)  
approx. 260 g  
approx. 112 x 146 x 58 mm  
Weight  
Dimensions  
32  
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Specifications  
Receiver  
Audio connection  
Power supply  
3.5 mm stereo jack socket  
via BA 300 rechargeable Li-Pol  
battery (3.7 V / 150 mAh)  
Operating time  
Weight  
Dimensions  
up to 9 hours  
approx. 50 g (with BA 300)  
approx. 70 x 60 x 26 mm  
NT 9-3AW mains unit  
Nominal input voltage 100 V~ to 240 V~  
Mains frequency 50–60 Hz  
Nominal output voltage 9 V DC  
Nominal output current 300 mA  
Ambient temperature  
+5°C to +40°C  
33  
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Specifications  
In compliance with  
Europe:  
EMC  
EN 301489-1/-9  
Radio  
EN 301357-1/-2  
EN 60065  
Safety  
The devices can be operated license-free in most countries  
of the European Union.  
Approved by  
Canada:  
Industry Canada RSS 210  
IC: 2099A-840  
USA:  
FCC 47 CFR Part 15C  
FCC-ID: DMOSET840  
Transmitters that operate in the 863 – 865 MHz frequency  
range can be used licence-free in the following countries:  
AT, BA, BE, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS,  
IT, LI, LT, LU, LV, ME, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK,  
TR, UA.  
The NT 9-3AW mains unit is certified in accordance with the  
legal safety requirements of Europe, the United States,  
Canada, China and Russia.  
34  
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Manufacturer Declarations  
Manufacturer Declarations  
Warranty  
Sennheiser electronic GmbH & Co. KG gives a warranty of  
24 months on this product.  
For the current warranty conditions, please visit our  
iser partner.  
FOR AUSTRALIA ONLY  
Sennheiser’s goods come with guarantees that cannot be  
excluded under the Australian Consumer Law. You are enti-  
tled to a replacement or refund for a major failure and  
compensation for any other reasonably foreseeable loss or  
damage. You are also entitled to have the goods repaired or  
replaced if the goods fail to be of acceptable quality and the  
failure does not amount to a major failure.  
This warranty is in addition to other rights or remedies  
under law. Nothing in this warranty excludes, limits or  
modifies any liability of Sennheiser which is imposed by  
law, or limits or modifies any remedy available to the  
consumer which is granted by law.  
To make a claim under this warranty, contact Sennheiser  
Australia Pty Ltd, Unit 3, 31 Gibbes Street, Chatswood NSW  
2067, Australia; Phone: (02) 9910 6700,   
All expenses of claiming the warranty will be borne by the  
person making the claim.  
The Sennheiser International Warranty is provided by  
Sennheiser Australia Pty Ltd (ABN 68 165 388 312), Unit 3,  
31 Gibbes Street, Chatswood NSW 2067, Australia.  
35  
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Manufacturer Declarations  
In compliance with the following requirements  
• WEEE Directive (2012/19/EU)  
Please dispose of the devices at the end of their  
operational lifetime by taking them to your local  
collection point or recycling center for such  
equipment.  
• Battery Directive (2006/66/EC)  
The supplied batteries or 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 batteries.  
CE Declaration of Conformity  
0682  
• R&TTE Directive (1999/5/EC)  
• EMC Directive (2004/108/EC)  
• Low Voltage Directive (2006/95/EC)  
• RoHS Directive (2011/65/EU)  
Before putting the devices into operation, please observe  
the respective country-specific regulations.  
36  
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Manufacturer Declarations  
Statements regarding FCC and Industry Canada  
This equipment complies with Part 15 of the FCC Rules and  
with RSS-210 of Industry Canada. Operation is subject to  
the following two conditions: (1) this equipment may not  
cause harmful interference, and (2) this equipment must  
accept any interference received, including interference  
that may cause undesired operation.  
This equipment has been tested and found to comply with  
the limits for a Class B digital device, pursuant to Part 15 of  
the FCC Rules. These limits are designed to provide reason-  
able protection against harmful interference in a residen-  
tial installation. This equipment generates, uses and can  
radiate radio frequency energy and, if not installed and  
used in accordance with the instructions, may cause  
harmful interference to radio communications. However,  
there is no guarantee that interference will not occur in a  
particular installation. If this equipment does cause  
harmful interference to radio or television reception, which  
can be determined by turning the equipment off and on,  
the user is encouraged to try to correct the interference by  
one or more of the following measures:  
• Reorient or relocate the receiving antenna.  
• Increase the separation between the equipment and  
receiver.  
• Connect the equipment into an outlet on a circuit  
different from that to which the receiver is connected.  
• Consult the dealer or an experienced radio/TV technician  
for help.  
This class B digital equipment complies with the Canadian  
ICES-003.  
Changes or modifications made to this equipment not  
expressly approved by Sennheiser electronic Corp. may  
void the FCC authorization to operate this equipment.  
Before putting the equipment into operation, please  
observe the respective country-specific regulations!  
37  
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Index  
Index  
Receiver  
Adjusting the balance 18  
Adjusting the volume 16  
Attaching the receiver to clothing 14  
Automatic channel search 17  
Channel indicator (meaning) 22  
Cleaning 25  
No sound signal 26  
Operating elements 5  
Operating time 20  
Reception is subject to interference 17  
Searching for a sound source 17  
Sound is hardly intelligible 27  
Sound is only audible with one ear 27  
Storing and charging the receiver 20  
Switching the acoustic signals off 25  
Switching the receiver on/off 16  
Rechargeable battery  
Replacing and charging the rechargeable battery 21  
Special functions  
Fine adjusting the speech intelligibility 28  
Treble boost control 29  
Terms  
Compression/treble boost 28  
Mono/stereo 19  
Transmitter  
Changing the channel 17  
Cleaning 25  
Connection to a SCART socket 9  
Connection to a sound source 7  
Connection to an RCA socket 8  
Connection to the mains 11  
Enhancing the speech intelligibility 19  
Installation 6  
Operating elements 5  
Operation indicator (meaning) 22  
Switching between mono and stereo operation 18  
Switching the transmitter on/off 15  
Troubleshooting 26  
Using the MKE 800 TV-N external microphone 9  
Versions  
EU version 4  
US version 4  
38  
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