Beyerdynamic Stereo Receiver SIR 320 User Manual

OPERATING INSTRUCTIONS  
SIR 320  
Infrared Multi-Channel Receiver  
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SIR Infrared System  
SIR 320  
Content  
About this manual................................................................................................................4  
Symbols...................................................................................................................................................... 4  
Important tips.......................................................................................................................6  
General information ................................................................................................................................ 6  
Safety information................................................................................................................................... 6  
SIR 320 Infrared Multichannel Receiver ..........................................................................7  
Contents of basic delivery....................................................................................................................... 8  
Accessories................................................................................................................................................ 8  
System components................................................................................................................................. 8  
Technical data .......................................................................................................................................... 9  
Characteristics of reception.................................................................................................................. 10  
Horizontal........................................................................................................................................... 10  
Vertical ................................................................................................................................................ 11  
Operating controls.............................................................................................................12  
Front view............................................................................................................................................... 12  
Infrared lens........................................................................................................................................ 13  
LC-Display.......................................................................................................................................... 13  
Navigation keys.................................................................................................................................. 13  
Charging contacts .............................................................................................................................. 13  
Headphone socket.............................................................................................................................. 13  
Side- / Rear view..................................................................................................................................... 14  
Carrying clip ....................................................................................................................................... 14  
Lanyard................................................................................................................................................ 14  
Battery cover...................................................................................................................................... 14  
Operation ...........................................................................................................................15  
Starting the receiver .............................................................................................................................. 15  
Volume control / memory function..................................................................................................... 16  
Auto Switch-off function ...................................................................................................................... 16  
Disposable / rechargeable batteries....................................................................................................... 17  
Service mode........................................................................................................................................... 18  
Activation of the service mode ....................................................................................................... 18  
Battery voltage................................................................................................................................... 19  
IR-field strength ................................................................................................................................. 19  
Guard function (option) .................................................................................................................... 20  
System parameters P1, P2, P3......................................................................................................... 20  
Muting ................................................................................................................................................. 20  
Channel shift ...................................................................................................................................... 20  
Exit the service mode........................................................................................................................ 21  
Hardware reset ........................................................................................................................................ 21  
Behaviour in the charging tray............................................................................................................. 21  
Trouble shooting .................................................................................................................................... 22  
Table of frequencies and channels ....................................................................................................... 23  
Warranty.............................................................................................................................24  
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SIR 320  
SIR Infrared System  
About this manual  
Symbols  
The meaning of the symbols and fonts used in this manual:  
Indicates an important note, if not minded, the functionality of the unit, the security of your data, or  
your health are put at risk. Taking special care when you see this symbol as indicates important  
information!  
Supplementary information, remarks, and tips follow this symbol.  
Text which follows this symbol describes activities that must be performed in the order shown.  
Texts in bolded letters require your special attention.  
This product conforms to the rules of the following European regulations:  
89/336/EWG  
Council directive to the alignment of the rules, of rights of all member states about the electromagnetic  
compatibility, adapted through RL 91/263/EWG, 92/31/EWG and 93/68/EWG of the council. Further  
information is available on request.  
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! CAUTION !  
YOU SHOULD PAY ATTENTION TO THE  
FOLLLOWING SAFETY INSTRUCTIONS!  
Before setting receivers with rechargeable batteries into operation:  
As soon as the rechargeable batteries are inserted in the receivers,  
these have to be charged immediately and completely in the  
designated SIR C 50 Charging Tray (equipped with Original  
beyerdynamic power supply).  
Remember: Receivers not changing about 2 or 3 month will result in total discharge. This will cause  
the destruction of the rechargeable batteries! Therefore total discharged or defective rechargeable  
batteries will not be longer charged and have to be exchanged. In such a case you only may insert a  
new set of rechargeable batteries.  
We recommend charging the rechargeable batteries every month for approx. 8 hours.  
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SIR 320  
SIR Infrared System  
Important tips  
General information  
Please read this manual carefully before starting operation. Keep this manual together with the units. If you  
pass on the units to other parties, please include this manual.  
To avoid damages of the receiver please read the following tips for the use with disposable or rechargeable  
batteries carefully!  
Don’t use disposable and rechargeable batteries together in one receiver!  
You will invalidate the warranty and damage the receiver.  
In no case it is allowed to charge receivers with disposable batteries! They can leak or even  
explode.  
Changing of batteries  
When changing the batteries the receiver may stop reacting. In this case please carry out a hardware  
reset. (See paragraph Operation > Hardware reset)  
The warranty invalidates, if you cause (generate, precipitate) inappropriate use or handling of the unit.  
Safety information  
Over prolonged period the unit should not be used at the maximum volume  
setting (value 15). Prolonged exposure to high sound pressure levels might damage your hearing!  
The used headphones may not cross a sound pressure of 100dB SPL at max. adjusted volume value!  
Preferably use the headphones indicated by us.  
Take care in the use of the lanyard!  
Attention! – Polarity  
During insertion of new disposable/rechargeable batteries take care of the correct polarity. Wrongly  
inserted batteries will cause malfunctions. Wrongly inserted batteries can leak and destroy the  
equipment.  
6
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SIR 320 Infrared Multi-channel Receiver  
Congratulations on buying the SIR 320 infrared receiver from beyerdynamic! You have invested in reliably  
conference equipment.  
The SIR 320 multi-channel receiver uses the same standards and protocols, which govern all other  
beyerdynamic infrared transmission systems; this allows operation with other manufactures equipment  
operating to the same standards. The built-in PLL- (Phase-locked-loop) synthesiser guarantees a high  
sensitivity as well as good reception.  
The new generation of the SIR receivers allows use in direct sunlight, e.g. outside or in places where normal  
infrared-reception would nearly be impossible due to high light intensity, as experienced at press  
conferences, on stages, etc.  
Together with other system components the receiver enables wireless audio transmission.  
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SIR 320  
SIR Infrared System  
Contents of basic delivery  
SIR 320 Infrared Receiver ..........................................Order # 484.539  
Battery cover incl. screw - fixed to receiver  
Carrying clip incl. spring - fixed to receiver  
Accessories  
DT 1 Single-sided headphone, 32 ohms,  
cable length 0.8 m ......................................................Order # 471.399  
DT 2 Headphone, 16 ohms,  
cable length 0.8 m ......................................................Order # 471.437  
DT 3 Neckworn headphone, 64 ohms,  
cable length 0.8 m ......................................................Order # 484.571  
NiMH –rechargeable batteries  
(3 batteries are needed per receiver).........................Order # 484.504  
SIR C 50 Transport case for SIR 320 receivers  
incl. power supply, 230 V ...........................................Order # 484.547  
System components  
The SIR 320 receiver operates as a single component in a wide system; a complete SIR language  
distribution system also requires the following components:  
IR-transmitter e.g. SIR 800 (to modulate audio input)  
IR-radiator e.g. SIR 801 (to transmit modulated audio by infrared light)  
IR-receiver SIR 320 with headphone (to receive infrared light and convert to audio output)  
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Technical data  
Complies with standards IEC 914 and IEC61603-3 (in normal operation)  
Number of channels:  
Modulation:  
up to 32 (in dependence of type) regarding IEC 61603-2 and IEC 61603-7  
FM  
Transmission frequencies:  
Intermediate frequency:  
Operating mode:  
55 kHz - 1335 kHz in 40 kHz pattern for OR - Ch31  
455 kHz  
Superhet receiver with PLL Synthesizer  
120° horizontal / 100° vertical  
125 - 8.000 Hz  
Angle of reception:  
Frequency response:  
Distortion factor:  
< 2 %  
Signal / Noise ratio:  
Headphone socket:  
Headphone impedance:  
Operating voltage:  
Power supply:  
> 55 dB  
3,5mm (DIN 455838)  
32 - 600 Ohm  
3.6 ... 4.5 Volts  
3 x rechargeable batteries NiMH 1.2V / 750 mA/h (AAA)  
or 3 x disposable batteries 1,5V (AAA)  
Operating time  
Display:  
up to 75 hours (rechargeable batteries)  
up to 120 hours (disposable batteries)  
seven-segment 2 digit LCD (Liquid Crystal Display) back lighted  
(white text / black ground)  
Test functions:  
Battery voltage and IR-field strength via LCD  
Temperature range:  
(operating) +10°C ... +40°C  
(storage) -20°C ... +50°C  
Humidity:  
Size:  
< 80%, not condensed  
150 x 50 x 25 mm  
Housing:  
Weight:  
ABS-plastic, grey  
approx. 150g (incl. batteries)  
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SIR 320  
SIR Infrared System  
Characteristics of reception  
Horizontal  
120° ( + / - 60°)  
0°  
10°  
10°  
20°  
20°  
30°  
30°  
40°  
40°  
50°  
50°  
60°  
60°  
70°  
70°  
80°  
80°  
50%  
100%  
80%  
60%  
40%  
20%  
10  
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Vertical  
100° ( + / - 50°)  
80°  
100%  
80%  
70°  
60°  
50°  
40°  
60%  
50%  
30°  
40%  
20°  
10°  
20%  
0°  
10°  
20°  
30°  
40°  
50°  
60°  
70°  
80°  
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SIR 320  
SIR Infrared System  
Operating controls  
Front view  
Infrared lens  
LC-Display  
Navigation keys  
Charging contacts  
Headphone socket  
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Infrared lens  
… for receiving of infrared signals.  
Note: To avoid disturbances the IR-lens should not be covered!  
LC-Display  
The LCD (Liquid Crystal Display) is a seven-segment display (two digits) and gives information on different  
functions and the condition of the receiver.  
The following list is a key to the information that can be displayed.  
Normal operation display  
00  
01 … 31  
or  
Original channel (unshifted) (Default display is the channel selection)  
channels 01 to 31 (Default display is the channel selection)  
Original channel (shifted)  
˙00 … ˙15  
Volume setting  
(Only displayed when volume button depressed, display reverts to channel display after 3 seconds)  
Service Mode display  
SE  
Service mode, flashes alternately with a two-digit number ‘XX’, indicating the firmware  
version.  
XX  
bA  
43  
Two-digit number ‘XX’, indicating the firmware version, e.g. 26 (Version 2.6)  
Battery status, flashes alternately with a two-digit number  
Two-digit number, flashes alternately with bA (battery status),  
the number shows battery status, ‘43’ = 4.3 V (operating voltage)  
Display of the IR field-strength, flashes alternately with  
rF  
two letters indicating IR field-strength Lo, no, Hi and the channel number.  
IR field-strength of other channels can be checked by pressing “VOL” or “VOL”.  
Lo  
no  
Hi  
XX  
˙GU  
P1 … P3  
U  
Lo (Low), IR field-strength less than 28 dBa  
no (Normal), IR field-strength between 30 and 40 dBa  
Hi (High), IR field-strength higher than 40 dBa  
Two-digit number ‘XX’, indicating the channel number (flashes alternately with rF)  
Guard module is installed and activated (changing is not possible)  
Factory test settings (test only)  
Muting, Default = ON  
SH  
Channel Shift, Default = OFF  
En / nd  
(flashes alternately) End of menu in service mode and exit point.  
- exit with “CH” or “VOL” or “VOL”  
- or with hardware reset  
- or automatically after 120sec.  
Navigation keys  
(VOL)  
(VOL)  
(CH )  
(CH )  
Volume up  
Volume down  
Channel up  
Channel down  
Charging contacts  
The charging contacts will be used to recharge the receiver. Therefore the receiver must be equipped with  
rechargeable batteries and the storage tray has to be connected to the power supply (see accessories).  
Headphone socket  
… for connecting a dedicated headphone (see accessories).  
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SIR 320  
SIR Infrared System  
Side- / Rear view  
Carrying clip,  
Press here to open  
cut-out  
Cut-out for lanyard  
Type plate  
Battery cover  
Cover screw  
Carrying clip  
There are different ways to “wear” the receiver. The built-in clip allows secure fastening to your shirt or jacket  
pocket. The clip is not intended using at a belt; this could obscure the lens from the IR signal. Another way is  
to use the lanyard wearing the receiver around your neck.  
Lanyard  
The lanyard should pass through both cut-out positions in the carrying clip on the rear of the receiver,  
so allowing the clip lying flush to the body of the receiver. In the event of the lanyard being pulled, the  
carrying clip will release from the receiver housing, this is a designed safety function. The clip’s spring is  
secured to the clip to prevent loss. If the clip becomes detached it is easily pushed back into place.  
Battery cover  
… for covering the battery tray. To remove the battery cover the cover screw must be released. The screw is  
retained in the battery cover and cannot be lost. (Further hints see batteries / rechargeable batteries)  
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Operation  
Starting the receiver  
To start the receiver, just press one of the buttons on the navigation pad. The receiver will now display for a  
short time the firmware version number and then the last selected channel number. The back light of the  
display will high light for approx. 3 sec. and then switch automatically off to low light to conserve battery  
power.  
Channel selection is via the navigation pad, press “CH (to decrease) or “CH (to increase). The  
display shows the selected channel. During the channel selection the audio signal will be muted.  
If the buttons are held down when pressed, you can scroll through the channels more quickly.  
The display shows the selected channel.  
When switched off the last selected channel will be stored and the receiver will  
default to that channel when switched on again.  
Channel display  
In case of using Shift Mode with a 32-channel receiver, the channel display  
can switch up to channel 38; however the IR- transmission is supported up  
to channel 31. This means that the maximum number of channels that can  
be used in Shift mode will be 25 (OR+24). Shift mode is a channel offset by a  
factor of 7 and is selected when interference is experienced with switched energy  
saving lamps. In case of interference the disturbances are audible up to channel 5  
or 6. The interference comes from the first, second, and third harmonic of the  
lighting system. Adjustment to Shift mode – if required - will be made by the  
installing company or from an authorised technician.  
Display of the Original channel  
Display of the Original channel in “Shift Mode”  
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SIR 320  
SIR Infrared System  
Volume control / memory function  
The volume control is adjusted by “VOLand “VOL. During volume adjustment a dot will appear  
in the top left hand corner of the display to differentiate between volume and channel selection  
(without dot).  
The minimum volume is displayed as ˙00”; maximum volume is displayed as ˙15” . The factory default  
setting is ˙01”. After use the receiver keeps its last settings. When used again the receiver defaults to these  
settings. This applies not only to the volume but also to the channel selection. When the volume settings are  
˙00” or higher than ˙08” the receiver automatically reverts to the factory default setting of, ˙01” after  
switch-off.  
This allows the next user to initially hear the audio signal and to protect the users hearing during switch-on.  
The volume should not be at the maximum value (˙15”) over a long period as this may affect or  
damage your hearing.  
The receiver has an automatic gain control, which protects it from strong signals within a short  
distance of the IR radiator panel. A too wide distance between the IR radiator and receiver will result  
in background noise. An optimised IR radiator installation guarantees a good distribution of the IR-  
signal, resulting in reception without background noise.  
Auto Switch-off function  
The following will cause the receiver to switch off automatically:  
after approx. 15sec., when no headphone is connected  
or  
after approx. 60sec., when no infrared signal is received  
or  
directly, when you put it out of the charging tray  
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Disposable / rechargeable batteries  
The receiver was designed to meet the demands of different power supplies. It is equipped with charging  
contacts and charging regulators are integrated. This gives the advantage to use the receiver with  
disposable or rechargeable batteries (NiMH – types).  
Disposable batteries  
Type:  
VARTA Electric Power V8003  
Size:  
Number:  
LR03, AAA  
3 pcs.  
Rechargeable batteries  
Type:  
SANYO HR-4U  
Size and number as before.  
Attention!  
Do not use disposable and rechargeable batteries within the same receiver! Otherwise you will  
invalidate the warranty and damage the receiver itself.  
Attention! – Polarity  
During insertion of new disposable/rechargeable batteries take care of the correct polarity. Wrongly  
inserted batteries will leak and damage the equipment.  
Charging of the receivers  
Take care that you recharge receivers fitted with rechargeable batteries only in combination with  
the charging tray. Receivers with disposable batteries must not be recharged! Attempts to do so will  
invalidate the warranty and damage the receiver.  
If the battery tray is empty you should only put in the receiver in the charging trays when no power  
supply is connected. The receiver can be damaged!  
Battery status (Battery voltage)  
The battery status can be checked within the Service-mode (SE). Exchange exhausted batteries as  
soon as possible; exhausted batteries should not be left in the receiver!  
Min./Max. Battery voltage for disposable batteries: 3.3V – 4.5V  
Min./Max. Battery voltage for rechargeable batteries: 3.9V – 4.2V  
Changing of batteries  
When changing the batteries the receiver may stop reacting. In this case please carry out a hardware  
reset.  
(See paragraph Operation > Hardware reset)  
Important!  
Please remember: Exhausted batteries should not be thrown into the domestic waste! Handle the  
batteries as hazardous waste and dispose it in accordance with the instructions to product recycling!  
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SIR 320  
SIR Infrared System  
Service mode  
The service mode is useful to check the receiver-settings or adjust the receiver to special parameters  
needed like:  
Check of firmware version  
Check of battery voltage  
Measurement of IR field-strength  
Display of factory test settings  
Activating/deactivating of muting  
Activating/deactivating of shift-mode  
Activation of the service mode  
The “CH and the “CHkey must be pressed simultaneously for about 5 sec.  
You will see “SE” within the display: starting point for  
adjustments.  
“SE” flashes within the display, alternating with the  
version number of the firmware  
(e.g. 24 or higher).  
Service mode activated  
Display of version (e.g. 3.0)  
By repeatedly pressing the “CHor “CHkey you can scroll through the Service mode for further  
activities.  
The structure is as follows:  
SE  
bA  
Battery voltage  
rF  
Hi / no / Lo and channel number  
GU  
Guard installed  
P1  
P2  
P3  
U  
oF / On  
SH  
oF / On and channel number  
En / nd (End)  
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Battery voltage  
In service mode press “CHto check the battery voltage.  
The battery voltage can be read alternately with the sign “bA” and a two-digit number.  
The display should be interpreted as follows:  
voltage is e.g. “38” this equates to 3.8 Volts.  
Min./Max. battery voltage:  
Disposable batteries  
3.3V – 4.5V  
Rechargeable batteries 3.9V – 4.2V  
Display of battery check (bA)  
IR-field strength  
Press “CHagain to scroll to the IR-field strength meter “rF” will be displayed alternately with  
“Hi” (high), “no” (normal) or “Lo” (low) and the last chosen channel number (2-digit).  
For instance: (rF.....Hi.....rF..... Hi…..rF…...01.....rF.....Hi.....)  
The IR-field strength of other channels can be checked by pressing “VOLor “VOL.  
Low:  
Normal:  
High:  
Field strength lower than 28 dBA  
Field strength between 30 and 40 dBA  
Field strength higher than 40 dBA  
Signal > 40 dBA  
Display of the IR-field strength (rF)  
IR-field strength „Hi“ (optimum reception)  
If muting is activated and the IR-field strength is lower than 20dBA, the audio signal will be  
automatically switched off.  
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SIR 320  
SIR Infrared System  
Guard function (option)  
Press “CHto scroll to the Guard test function “GU” can be displayed.  
If the Guard-module is installed and the menu item is activated it can be checked by  
pushing “VOL”. The Guard signal will switch on for a period of 5 sec. You can hear a  
clear non continuous peeping sound. If no sound is heard either the Guard module is  
not installed or another problem is occurred. Pushing “VOLwill stop the test  
immediately.  
Display if GUARD Module is installed  
System parameters P1, P2, P3  
Press “CHto scroll to the system parameters “P1, P2, P3”.  
The displayed values are for testing purposes only and can not be modified.  
Muting  
Press “CHto scroll to “U.  
This function means muting of the audio signal in the infrared field if there is a weak  
signal e.g. less than 20 dBA field strength (reasonable values are 36-43 dBA field  
strength). The muting function is normally on (factory default), you may see that at the  
display with the letters “on”. Deactivation (“oF”) can be made with “VOLkey,  
activation (“on”) via “VOLkey.  
Display of the Muting function  
Channel shift  
Press “CHto scroll through to “SH”.  
The Shift mode is identified with “SH” and is normally in the off-position (factory  
default), displayed as “oF”. To activate the Shift mode push the “VOLkey, for  
deactivate push the “VOLkey. This offsets reception frequencies by 7 channels to  
a higher channel position. This shifting avoids interference from lighting systems. After  
activation the original floor language will be displayed as “or” instead of “00”.  
Display of Shift mode  
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Exit the service mode  
Press “CHto scroll to “En” flashing alternately with “nd” in the display. At this position you can  
leave the Service mode by pressing the “VOL, “VOLor “CHkey. The IR- receiver will  
return to the newly adjusted settings in the operation mode.  
The display back light illuminates and the display itself  
shows the version number and afterwards turns back to the  
starting channel.  
Display of Exit service mode  
If you do not leave the Service mode as described above, the receiver will return after approx. 2  
minutes automatically to the normal operation mode and all settings will be stored.  
Hardware reset  
In case the receiver fails to respond to button push please carry out a hardware reset to factory default  
settings. The hardware reset brings back all factory defaults and is activated by the keys “VOLand  
“VOLsimultaneously.  
Behaviour in the charging tray  
In the charging tray (SIR C 50) the receiver shows “bA” alternating with “XX” (battery voltage) in the display  
e.g. 37.  
If you take out the receiver from the charging tray the receiver switches off itself.  
If you put the receiver in the charging tray, it switches directly into the charging mode.  
Display: “bA” and “XX” (battery voltage) alternately  
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SIR 320  
SIR Infrared System  
Trouble shooting  
Fault  
Possible reason  
Action  
No sound at headphone  
No sound at headphone  
Headphone not connected  
Receiver not switched-on  
Plug in headphone  
Push one button at the  
navigation dial with  
headphone connected  
No sound at headphone  
Display at the receiver not lighting  
after switching on.  
Insert new batteries and carry  
out a hardware reset  
Batteries not inserted, empty or  
weak.  
Receiver can not be  
switched-on  
Undefined working order  
Undefined working order  
Carry out a hardware reset  
Carry out a hardware reset  
After switching-on, the  
back light is shining only,  
no further keystroke is  
possible  
Receiver gets noise at the No IR - reception  
headphone only  
Switch on IR–transmitter  
Receiver gets noise at the No IR - reception  
headphone only  
Connect the radiators with  
active IR-transmitter  
Receiver gets noise at the No IR - reception  
headphone only  
Change IR-channel to other  
position  
Receiver gets noise at the Selected IR-channel has no  
Check IR-transmitter using  
correct adjustment  
headphone only  
transmission  
Receiver gets noise at the Receiver is in Shift mode setting  
Deactivate the Shift mode  
(See Service mode)  
headphone only  
(instead displaying „00“ (OR-ch)  
you will see „or“  
No sound at headphone  
Volume to low  
Adjust volume (VOL up)  
No sound at headphone  
Wrong headphone used  
Use the correct headphone  
(see accessories)  
Receiver switched off after No reception signal  
approx. 15 sec.  
Check whether the IR-  
transmitter and the radiators  
are switched-on  
Receiver switched off after Reception channel will not be  
Change channel setting  
(channel up or down)  
approx. 15 sec.  
transferred from IR-transmitter  
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Table of frequencies and channels  
For normal and shift operation for each receiver version:  
32 channel receiver SIR 320  
Normal operation  
Shift operation  
Channel  
K0  
Frequency  
55 kHz  
LC-Display  
Channel  
Frequency  
335 kHz  
375 kHz  
LC-Display  
00  
01  
...  
K7  
or  
K1  
95 kHz  
K8  
01  
...  
...  
...  
K31  
1335 kHz  
31  
K31 (K38)  
1615 kHz  
24(31)  
Remark: The intermediate frequency is 455 kHz  
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SIR 320  
SIR Infrared System  
Warranty  
beyerdynamic GmbH & Co. KG provides you with two years’ guarantee on brand-new devices from the date  
of purchase. Please save your sales receipt and this guarantee supplement. Without this proof repairs can  
fundamentally only be carried out for a charge. The guaranteeing includes materials and working time for the  
elimination of demonstrable defects in material or workmanship. The guarantee claim is void in the case of  
operating errors, improper operation, electric and mechanical damage, as well as in the case of improper  
repairs by unauthorised workshops.  
Excluded from the guarantee claim are batteries and rechargeable batteries included in the delivery, as well  
as parts that are  
subject to natural wear and tear during usage, such as connecting cables, ear cups,  
headband pads, etc.  
The guarantee can be claimed in all countries in which legal provisions do not stand in the way of the  
guaranteeing.  
Valid in all countries in addition to the legal provisions are the guarantees provided by beyerdynamic sales  
locations.  
beyerdynamic rejects any guarantee, if the safety label with the serial number is removed.  
beyerdynamic declares itself to agree to exchange or repair defective components due to faulty materials or  
manufacturing, dependent on following procedure:  
1) The client declares that the fault is not due to empty, discharged, wrongly inserted, or faulty batteries.  
2) You may send the defective product to:  
beyerdynamic GmbH Service & Logistik Center  
August-Häußer-Str. 9  
D-74080 Heilbronn  
Germany  
3) Should it turn out that the fault was caused through inattentiveness or inappropriate use, the service and  
shipping charges will be added to the clients account.  
24  
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NOTES  
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25  
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SIR 320  
SIR Infrared System  
NOTES  
26  
Copyright by beyerdynamic  
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NOTES  
Copyright by beyerdynamic  
27  
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beyerdynamic GmbH & Co. KG  
Theresienstr. 8  
74072 Heilbronn – Germany  
Tel. +49(0)7131-617-0  
Fax +49(0)7131-617-224  
beyerdynamic U.K. Ltd.  
17 Albert Drive  
Burgess Hill RH15 9TN  
Tel. +44(0)1444-258258  
Fax +44(0)1444-258444  
beyerdynamic Inc. USA  
56 Central Ave.  
Farmingdale, NY 11735  
Tel. +1(631)293-3200  
Fax +1(631)293-3288  
Non-contractual illustrations. Subject to change without notice.  
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