Sennheiser SR 3256, SR 3254 User Manual

SR 3254

SR 3254

Instructions for use

SR 3256

4

SR 3256

Contents

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

SR 3254/SR 3256 transmitters ......................................................6

Delivery includes ................................................................................7

Overview of operating controls ......................................................8

Indications and displays ...........................................................................9

Preparing the transmitter for use ................................................10

Using the transmitter as a stand-alone unit ......................................10

Rack-mounting several transmitters ...................................................11

Connecting the transmitter to the mains ............................................14

Using transmitters in a multi-channel system ...................................15

Using the transmitter .....................................................................17

Switching the transmitter on/off .........................................................17

The operating menu of the transmitter ......................................19

Overview of the operating menu ..........................................................20

Selecting the frequencies to be stored in the channel bank “U” ...21

Selecting a channel from the channel bank “U” or “F” ....................22

Switching between mono and stereo operation ................................22

Care and maintenance ....................................................................23

Cleaning the transmitter ........................................................................23

Replacing the fuse ....................................................................................23

If problems occur ... .........................................................................25

Error checklist ...........................................................................................25

Additional information ...................................................................26

Specifications ...................................................................................27

Connector assignment ............................................................................28

Accessories .......................................................................................29

Manufacturer declarations ............................................................30

Thank you for choosing Sennheiser!

We have designed this product to give you reliable operation over
many years. Over sixty 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

These instructions for use contain important safety
information.

Read these instructions.
Keep these instructions in a safe place. Always include these

instructions when passing the device on to third parties.
Heed all warnings.
Follow all instructions.

Operation

Use the device in dry rooms only. To reduce the risk of fire or
electric shock, do not expose the device to rain or moisture.
Objects filled with liquids, such as vases or coffee cups, must not
be placed on the device. Do not use the device near water or
liquids.

Never spill liquids of any kind onto the device. Should a spillage
occur, unplug the device and have it checked by a technician.

Never push objects of any kind through openings of this device
as they may touch dangerous voltage points or short-out parts
that could result in fire or electric shock.

Ensure sufficient ventilation. Do not block any ventilation
openings. Install in accordance with the manufacturer’s
instructions.

Do not install near any heat sources such as central heating
radiators, electric heaters, stoves, or other devices that produce
heat (e.g. amplifiers). Keep the device away from direct
sunlight and similar sources of heat.

The device is a Class 1 device. It must only be connected to
properly grounded power outlets.

This device is supplied with an IEC power cable complete with a
moulded mains plug. This is for your safety - do not tamper with
the mains. If the supplied cable does not fit your mains socket,
please consult a competent electrician for a replacement cable

2

that matches the power output sockets in your country, or to
replace the obsolete socket with one to current standards.

This device should be operated only from the type of power
source indicated on the marking label. lf you are not sure of the
type of power supply to your building, consult your dealer or
local power company.

Do not overload wall outlets and extension cords as this may
result in fire and electric shock.

Protect the power cord from being walked on or pinched,
particularly at plugs, convenience receptacles, and the point
where they exit from the device.

Only use attachments/accessories specified by Sennheiser.
Use only with the mountings specified by Sennheiser. When a

cart is used, use caution when moving the cart/device
combination to avoid injury from tip-over.

Unplug the device during lightning storms or when unused for
long periods of time.

Service

No user serviceable parts inside! Do not attempt to service this
device yourself as opening or removing covers may expose
dangerous voltage or other hazards. If devices are opened by
customers in breach of this instruction, the warranty becomes
null and void.

Refer all servicing to qualified service personnel. Servicing is
required if the device has been damaged in any way, such as
mains cable or plug damage, liquid has been spilled, objects
have fallen inside, the device has been exposed to rain or
moisture, does not operate properly or has been dropped.

Clean only with dry cloth.

3

Symbols on adhesive labels attached to the device

The adjoining adhesive label is attached to the devices back.
The symbols on this label have the following meaning:

This symbol is intended to alert the user to the presence of un­insulated dangerous voltage within the product's enclosure
that may be of sufficient magnitude to constitute risk of fire or
electric shock.

This symbol is intended to alert the user to the risk of electric
shock if the unit cover or back is removed. There are no service­able parts inside. Refer servicing to qualified personnel only.

This symbol is intended to alert the user to the presence of im­portant operating and maintenance instructions in the litera­ture accompanying this product.

Attention! High volume!

This is a professional transmission system.
Commercial use is subject to the safety-at-work
regulations. Sennheiser, as the manufacturer, is
therefore obliged to expressly point out possible

health risks arising from use.
This system is capable of producing sound pressure exceeding

85 dB(A). 85 dB(A) is the sound pressure corresponding to the
maximum permissible volume which is by law (in some
countries) allowed to affect your hearing for the duration of a
working day. It is used as a basis according to the specifications
of industrial medicine. Higher volumes or longer durations can
damage your hearing. At higher volumes, the duration must be
shortened in order to prevent damage. The following are sure
signs that you have been subjected to excessive noise for too
long a time:

y You can hear ringing or whistling sounds in your ears.
y You have the impression (even for a short time only) that

you can no longer hear high notes.

4

Intended use of the transmitter

Intended use includes
y having read these instructions especially the

chapter “Safety instructions”.

y using the transmitter within the operating conditi-

ons as described in these instructions.

Improper use

Improper use is when you use the transmitter other
than described in these instructions or when you use
the transmitter under operating conditions different
from those described in these instructions.

5

SR 3254/SR 3256 transmitters

With the wireless in-ear monitoring system, consisting of the
SR 3254 or SR 3256 stereo transmitter and the EK 3253
bodypack receiver, musicians, video and sound amateurs,
reporters/broadcasters, etc. can directly monitor the received
sound signals without troublesome cables or monitor speakers
being required. In addition, the system can also be used for any
application where talkback signals are to be transmitted.

The system has superb audio quality with an increased signal­to-noise ratio and dynamic range due to the inclusion of
Sennheiser’s HDX noise reduction system.

SR 3254

SR 3256

4

The SR 3254 is a single stereo transmitter in a 19" 1 U housing.

The SR 3256 consists of two complete stereo transmitters in a
19" 1 U housing.

The stereo transmitters have the following features:

y Easy to use
y Stereo/mono selector switch
y Switching bandwidth of 36 MHZ per transmitter
y Transmission frequencies tunable in steps of 5 kHz
y HDX noise reduction system with more than 90 dB signal-to-

noise ratio

y LC display for frequency, RF output power and deviation
y Rugged 19" housing with built-in mains unit; supplied with

rack-mounting kit

y Suitable for multi-channel applications
y RF output power of up to 100 mW

6

The channel bank system

The SR 3254/SR 3256 transmitter is available in five UHF
frequency ranges:

Range A: 518 to 554 MHz
Range B: 626 to 662 MHz
Range C: 740 to 776 MHz
Range D: 786 to 822 MHz
Range E: 830 to 866 MHz

The transmitter has two channel banks with up to 16
switchable channels each. The channels of the channel bank “F“
(fixed bank) have been factory-preset to customer-specific
transmission frequencies. These frequencies cannot be
changed.

The channel bank “U” (user bank) allows you to freely select
and store frequencies.

Recommended receiver

y EK 3253

Delivery includes

y 1 SR 3254 transmitter or

1 SR 3256 twin transmitter

y 1 rack-mounting kit
y 1 mains cable
y 1 telescopic antenna (with the SR 3254)

or
2 telescopic antennas (with the SR 3256)

y Instructions for use

7

Overview of operating controls

 Headphone output,

¼” (6.3 mm) jack socket

 Headphone volume control
 LCD bargraph for deviation of the left

channel (DEV L), with overmodulation
display (“PEAK”)

 LCD bargraph for deviation of the

right channel and “MONO” (DEV R), with
overmodulation display (“PEAK”)

 LCD bargraph for RF output power (RF)
 Alphanumeric LC display

 Fuse holder and mains voltage

selection (230 or 115 V)

 2-pin IEC mains connector
 Cable grip for mains cable
 Programming interface,

15-pin sub-D socket

 Audio input, left (AF IN (L))
 Audio input, right

(AF IN (R) + MONO)

 Type plate
 Antenna output

 SET button
 왖 button (UP)
 왔 button (DOWN)
 POWER button

Note:

Connections and operating controls marked with a star () in the above illustration
are those for the second transmitter of the SR 3256 twin transmitter.

8

Indications and displays

 

   

 Alphanumeric display
 “FREQUENCY MHZ” display
 “CHANNEL” display
 LC dot CHANNEL
 LC dot TUNE
 LC dot MONO/STEREO
 LC dot STEREO (transmitter is set to stereo operation)
 LC dot MONO (transmitter is set to mono operation)
 MUTE display (transmitter is muted)
 6-step bargraph for RF output power
 11-step deviation bargraph

(two separate bargraphs for the left and right channel)



Deviation display

The two bargraphs  indicate the deviation of the audio signal
of the left and right channel. When the transmitter’s audio
input level is excessively high, “PEAK” lights up.

Display of the RF output power

The bargraph  indicates the RF output power. During normal
operation, an RF output power of 100 % is indicated.

9

Preparing the transmitter for use

Using the transmitter as a stand-alone unit

Mounting the transmitter feet

To ensure that the transmitter cannot slip on the surface on
which it is placed, four self-adhesive soft rubber feet are
supplied.

왘 Ensure that the base of the transmitter is clean and free from

grease before mounting the rubber feet.

왘 Fix the rubber feet to the base of the transmitter by peeling

of the safety paper and fitting them as shown in the diagram
on the left.

Attention!

Some furniture surfaces have been treated with varnish,
polish or synthetics which might cause stains when they
come into contact with other synthetics. Despite a thorough
testing of the synthetics used by us, we cannot rule out the
possibility of staining.

Connecting the telescopic antenna

10

When using the transmitter as a stand-alone unit, connect the
supplied telescopic antenna !. The telescopic antenna can be
mounted quickly and easily and is suitable for all applications
where – good transmission conditions provided – a wireless
transmission system is to be used without a large amount of
installation work.

왘 Connect the telescopic antenna to the BNC socket  at the

rear of the transmitter.

왘 Pull the end cap to extend the telescopic antenna.

Optimum transmission and reception conditions can be
obtained by using remote antennas (see “Mounting and
connecting remote antennas” on page 16).

Rack-mounting several transmitters

You can use the supplied rack mount “ears” to mount the
transmitter into a 19" rack (1 U). If you wish to mount the
antennas to the front of the rack, use the GA 3030-AM antenna
mount (see “Accessories” on page 29).

When rack-mounting the device, please consider that, during
operation, the ambient temperature within the rack may
significantly rise above room temperature. However, the
ambient temperature within the rack must not exceed the
temperature limit specified in the specifications.

When rack-mounting the device, take good care not to affect
the ventilation required for safe operation or provide additional
ventilation.

When rack-mounting the device, ensure that its housing is not
mechanically loaded and that it is adequately supported at the
rear, e.g. for transport.

When connecting the device to the power supply, observe the
information indicated on the type plate. Avoid circuit
overloading. If necessary, provide overcurrent protection.

Ensure a reliable mains ground connection of the device by
taking appropriate measures.

When rack-mounting the device, please note that intrinsically
harmless leakage currents of the individual devices may
accumulate, thereby exceeding the allowable limit value. As a
remedy, ground the rack via an additional ground connection.

11

Setting up the transmitters

The SR 3254 and SR 3256 transmitters heat up during
operation.

y Ventilation in fixed installations

Ensure sufficient ventilation, especially when the transmitters
are mounted into a desk or chassis. Provide for a duct of
sufficient size to ensure a free air flow between the trans­mitters.

y Sufficient ventilation in a rack

When operating several transmitters in a rack, ensure
sufficient ventilation or cooling. We recommend not stacking
more than two transmitter directly one above the other, and
then providing for a duct of sufficient size to ensure a free air
flow between the transmitters.

Rack-mounting the transmitter without mounting the
antennas to the front of the rack

왘 Hook the two rack mount “ears” " to the rear of the

transmitter.

왘 Secure the rack mount “ears” to the left and right of the

transmitter using four recessed head screws respectively.

12

왘 Slide the transmitter into the 19" rack.
왘 Secure the rack mount “ears” " to the rack.

Rack-mounting the transmitter and mounting the antennas
to the front of the rack

왘 Mount the antenna holders to the handles of the

transmitter as shown in the diagram on the left.

왘 Hook the two rack mount “ears” " to the rear of the

transmitter.

왘 Pull the cables of the antenna holders through the holes

in the rack mount “ears”.

왘 Secure the rack mount “ears” to the left and right of the

transmitter using four recessed head screws respectively.

왘 Connect the cables of the antenna holders to the antenna

sockets  at the rear of the transmitter.

왘 Slide the transmitter into the 19" rack.

왘 Connect the telescopic antennas to the BNC sockets of the

antenna holders .

13

Connecting the transmitter to the mains

The transmitter can be connected to 230 V or 115 V AC. Before
you plug the mains connector into the wall socket, please first
check that the transmitter is set to the correct mains voltage!

The set voltage is shown at the top of the fuse holder .

Selecting the mains voltage

WARNING!

To select the mains voltage, proceed as follows:

왘 Disconnect the transmitter completely from the mains by

pulling out the mains connector from the wall socket.

왘 Use a screwdriver to loosen the fuse holder .
왘 Remove the fuse holder with the inserted fuse.
왘 Turn the fuse holder by 180° and reinsert it.

The set voltage is shown at the top of the fuse holder.

Electric shock hazard!

In case of improper handling, you may come
into contact with electrically conducting parts
and receive an electric shock when removing
the fuse holder.

왘 Before removing the fuse holder, pull out the

mains connector from the wall socket.

14

Connecting the mains cable

왘 Insert the supplied mains cable into the socket on the

transmitter and pass the cable through the cable grip.

Note

A cable grip is particularly important when the transmitter is
permanently rack-mounted. Inside the rack there are often a
large number of cables – a cable grip prevents the cables
from pulling each other out.

Using transmitters in a multi-channel system

You can combine several transmitters to make a multi-channel
system. To do so, you require an antenna combiner (e.g. the
AC 3000, see “Accessories” on page 29) which allows you to
combine the signals of up to four twin receivers onto a single
antenna (see diagram below). For detailed information on
setting up a multi-channel system and on connecting the
transmitters, please refer to the operating manual of the
antenna combiner.

ANT

8:1

RF OUTPUT

15

A 2003

A 1031

Mounting and connecting remote antennas

Use a remote antenna when the transmitter position is not the
best antenna position for optimum transmission. You can
choose between two antennas (see “Accessories” on page 29):

y A 2003 UHF passive directional antenna
y A 1031 passive omni-directional antenna

Use a low-attenuation 50-Ω cable to connect the antenna to
the transmitter. Ready-made antenna cables from Sennheiser
are available as accessories with length of 5 m and 10 m. If
possible, use a short antenna cable and as little connections as
possible, since long cables and many connectors lead to an
attenuation of the antenna signal. Position antennas in the
same room in which the transmission takes place! Maintain a
minimum distance of 1 m from metal objects (including
reinforced concrete walls)!

Connecting the mixing console

Connect the mixing console to the XLR-3 sockets AF IN (L) 

and AF IN (R) + MONO .

Note

Any unit that is only suitable for mono operation must be
connected to the XLR-3 socket AF IN (R) + MONO . In this
case, set the transmitter to mono operation (see “Switching
between mono and stereo operation” on page 22).

16

Using the transmitter

Switching the transmitter on/off

왘 Press the POWER button  to switch the transmitter on or

off.
After switch-on, the LC display is backlit and the last
transmission frequency set is displayed.

Until the PLL has locked on the desired transmission frequency,
the transmitter is muted. “MUTE” appears on the display and
the LCD bargraph for RF output power (RF)  indicates 0 %.

Note

The POWER button  works in the secondary circuit of the
integrated mains transformer, and thus only switches the
low voltage side. For larger installations with several
transmitters, a complete mains disconnection can best be
achieved by a central ON/OFF switch.

17

Connecting the headphones/monitoring the audio signal

Attention! High volume!

Even short exposure to high volume levels can damage your
hearing! Set the volume for the connected headphones to the
minimum before putting the headphones on. Do not listen at
higher volume levels than with loudspeakers.

왘 Connect headphones with a ¼“ (6.35 mm) stereo jack plug

to the headphone output  to monitor the stereo audio
signal present at the audio inputs  AF IN (L) and

 AF IN (R) + MONO.

Note

Even during mono operation, the left and right channel are
reproduced separately via the headphones.

왘 First, set the volume control # to the lowest volume by

turning it to the left as far as possible. Then gradually turn up
the volume.

18

The operating menu of the transmitter

Via the operating menu, you can quickly and easily change the following settings:

Menu Function of the menu

TUNE Setting a transmission frequency for the channel bank “U”

(user bank)

CHANNEL Selecting a channel from the channel bank “U” or “F”
MONO/STEREO Switching between mono and stereo operation

The buttons

In the operating menu, all settings can be made using the 왖 , 왔 and SET buttons:

Buttons Mode Function of the button

왖/왔 Display mode Selects a menu.

Setting mode y Briefly pressing the button:

The display jumps either forwards or backwards to the
next setting.

y Holding down the button (“TUNE” and ”CHANNEL”

menu):
The display cycles continuously (“fast search”
function). The “fast search” function allows you to get
fast and easily to your desired setting.

SET Display mode Changes to the setting mode of the selected menu.

Setting mode y Stores the setting and returns to the display mode.

y In the “TUNE” menu:

Confirms the selection of the channel for which you
want to set the frequency.

Canceling an entry

When in the setting mode of a menu, you can cancel your entry
at any time by pressing the 왖 and 왔 buttons simultaneously.
The cancellation is briefly confirmed on the display with “ESc.”.

The previous setting is kept and the transmitter returns to the
display mode.

19

Overview of the operating menu

Display mode

Changing the channel

Press SET

for 1 sec.

SET

Current channel

: Transmission
frequency in steps of 5 kHz

SET

Current channel or current
frequency

Setting mode

SET

: U 1... U 16, F 1... F16

SET: Selects the channel

SET

Current frequency

: U 1... U 16, F 1... F16

SET

Switching between mono
and stereo operation

20

SET

Current setting

: Mono, Stereo

SET

TUNE Selecting the frequencies to be stored in the

channel bank “U”

Via the “TUNE” menu, you can freely select the frequencies to
be stored in the channel bank “U” (user bank).



왘 Press the 왖/왔 buttons to select the “TUNE” menu. The LC

dot “TUNE”  lights up.

왘 Press the SET button to get into the setting mode of the

“TUNE” menu.
The LC dot “TUNE”  and the “FREQUENCY MHZ” display 

start flashing.

Note

When pressing the SET button for one second, you can use
the 왖/왔 buttons to select a different channel for which you
can then change the frequency.

When you have selected the channel bank “F” and then select
the “TUNE” menu, the transmitter automatically switches to
channel 01 of the channel bank “U” and “U.01” appears on the
display. Otherwise, the current channel of the channel bank “U”
is displayed.

왘 Press the 왖/왔 buttons to select the desired transmission

frequency. Transmission frequencies are tunable in 5-kHz
steps within a switching bandwidth of 36 MHz max.

왘 Press the SET button to store your selection. “Sto.” briefly

appears on the display. While the transmitter changes to the
new frequency, it is muted.

21

CHANNEL Selecting a channel from the channel bank “U”

or “F”

왘 Press the 왖/왔 buttons to select the “CHANNEL” menu.



1 Sek.

The LC dot “CHANNEL”  and the “CHANNEL” display  light
up.

왘 Press the SET button to get into the setting mode.

왘 Press the 왖/왔 buttons to select the desired channel.

왘 Press the SET button to store your selection. “Sto.” briefly

appears on the display.

MONO/STEREO Switching between mono and stereo operation

왘 Press the 왖/왔 buttons to select the “MONO/STEREO” menu.

The LC dot “MONO/STEREO”  lights up.

왘 Press the SET button to get into the setting mode.

왘 Press the 왖/왔 buttons to select the desired operating mode.

22

왘 Press the SET button to store your selection. “Sto.” briefly

appears on the display.

Care and maintenance

Cleaning the transmitter

CAUTION!

왘 Before cleaning, disconnect the transmitter from the mains.
왘 If necessary, you can clean the transmitter with a slightly

damp cloth. Do not use any cleansing agents or solvents.

Water can damage the electronics of
the transmitter!

Water entering the housing of the transmitter
can cause a short-circuit and damage the
electronics.

왘 Only use a slightly damp cloth to clean the

transmitter.

Replacing the fuse

WARNING!

왘 Disconnect the transmitter completely from the mains by

pulling out the mains connector from the wall socket.

Electric shock hazard!

In case of improper handling, you may come into
contact with electrically conducting parts and
receive an electric shock when removing the
fuse holder.

왘 Before removing the fuse holder, pull out the

mains connector from the wall socket.

왘 Use a screwdriver to loosen the fuse holder .
왘 Remove the fuse holder with the inserted fuse.
왘 Replace the fuse by a new fuse with the same rating.
왘 Reinsert the fuse holder. Make sure to insert the fuse holder

the correct way round.
The set voltage is shown at the top of the fuse holder.

왘 Reconnect the transmitter to the mains and and switch it on

again.

23

If the replacement fuse also blows, please contact your local

Sennheiser agent or send the transmitter, with a precise

description of the trouble, to a Sennheiser service partner in

your area. You can find the address of your nearest service

partner in the enclosed service card or on the Internet at

“http://www.sennheiser.com/sennheiser/icm.nsf/root/

service_partner”.

24

If problems occur ...

Error checklist

Problem Possible cause Possible solution

No operation indication No mains connection Check the connections of

the mains connector

Fuse is defective Replace the fuse

No RF signal Transmitter and receiver

are not on the same
channel

Transmitter is out of
range

RF signal available,
no audio signal

Audio signal has a high
level of background
noise or is distorted

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

Transmitter is set to
mono operation and the
pilot tone evaluation of
the receiver is activated

Receiver’s squelch
threshold is adjusted too
high

Transmitter sensitivity is
adjusted too low or too
high

Set transmitter and
receiver to the same
channel

Change the antenna
position

Deactivate the pilot tone
evaluation on the receiver

Reduce the squelch
threshold on the receiver

See “Connecting the
mixing console” on
page 16

25

Additional information

HDX noise reduction

RF link

Inherent

noise of

the RF link

Transmitter

Receiver

Progress you can hear:

The product family is equipped with HDX, the Sennheiser noise

reduction system that reduces RF interference. It increases the

signal-to-noise ratio in wireless audio transmission to more

than 90 dB.

HDX is a wideband compander system which compresses the

audio signal in the transmitter in a 2:1 ratio (related to dB) to

lift it above the inherent noise floor of the RF link. In the receiver

the signal is expanded in an identical and opposite way in a 1:2

ratio to restore the original signal, at the same time reducing

the RF noise to below the noise floor of the receiver.

HDX has been specially developed for high quality radio

microphone systems.

Note:

Only transmitters and receivers that are equipped with HDX
can work correctly with each other. If non HDX equipment
was mixed with HDX, the dynamic range would be
drastically reduced and the transmission would sound blunt
and flat.

26

Specifications

RF characteristics

Frequency ranges 518–554, 626–662, 740–776, 786–822,

830–866 MHz

Transmission frequencies 1 channel bank with up to 16 factory-preset

channels
1 channel bank with up to 16 freely selectable

channels (frequencies tunable in steps of

5kHz)
Switching bandwidth 36 MHz
Frequency stability ±10 ppm (-10°C to +55°C)
Antenna output BNC socket, 50 Ω
RF output power max. 100 mW

AF characteristics

Modulation FM stereo working on the pilot tone principle
Noise reduction system Sennheiser HDX

Nominal/peak deviation ±24 kHz / ±48 kHz

MPX pilot tone
(frequency/deviation)

AF frequency response 40–15,000 Hz
Headphone output ¼“ (6.35 mm) stereo jack socket,

Load impedance of
headphone output

AF input 2 x XLR-3, electronically balanced
AF input voltage (at nom. deviation) +4 dBu at 1 kHz, internally adjustable
Signal-to-noise ratio > 90 dB(A)

THD
(at 1 kHz and nominal deviation)

19 kHz / ±5 kHz

≥ 200 mW/32 Ω

≥ 16 Ω

rms

(refers to overall link with EK 3253)

< 0.9 %

Note:

The above data also apply to the second transmitter in the SR 3256.

27

Overall unit

Power supply 115/230 V AC +10% / –15%
Power consumption SR 3254 max. 13 W
Power consumption SR 3256 max. 23 W
Dimensions

436 x 228 x 43 mm (19", 1 U)

(without rack mount “ears”)
Weight SR 3254 approx. 3,300 g
Weight SR 3256 approx. 4,000 g
Type approval USA: FCC-Part 74.861

FCC ID: DMOSREK3K

Canada: RSS-123

IC: 2099A-SREK3K

EU: ETSI EN 300 454-1/-2

CE 0682!

Connector assignment

SR 3254/SR 3256
¼“ (6.35 mm) stereo jack plug

for headphone output

XLR-3 connector (male)

21

+

3

28

Accessories

AC 3000-EU Active Antenna combiner Cat. no. 009424

AC 3000-UK Active Antenna combiner Cat. no. 009410

AC 3000-US Active Antenna combiner Cat. no. 094409

A 1031-U Passive omni-directional antenna Cat. no. 004645

GA 3030-AM Antenna mount Cat. no. 004368

A 2003 UHF Passive directional antenna Cat. no. 003658

GZL 1019 A5 BNC-BNC coaxial cable, length 5 m Cat. no. 002325

GZL 1019 A10 BNC-BNC coaxial cable, length 10 m Cat. no. 002326

GZV 1019A BNC coupler Cat. no. 002368

HD 25 Monitoring headphone Cat. no. 002976

EK 3253 A Monitoring receiver Cat. no. 500522

EK 3253 B Monitoring receiver Cat. no. 500523

EK 3253 C Monitoring receiver Cat. no. 500524

EK 3253 D Monitoring receiver Cat. no. 500525

EK 3253 E Monitoring receiver Cat. no. 500526

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Manufacturer declarations

Warranty regulations

The guarantee period for this Sennheiser product is 24 months from the date of purchase. Excluded are
accessory items, rechargeable or disposable 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 Directives
1999/5/EC, 89/336/EC or 73/23/EC. The declaration is available on the internet site at
www.sennheiser.com.

Before putting the device into operation, please observe the respective country-specific regulations!

WEEE Declaration

Your Sennheiser product was developed and manufactured with highquality 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.

30

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

Printed in Germany Publ. 09/06 513631 / A02