Sennheiser EMP 2015 Instruction manual

INSTRUCTION MANUAL
EMP 2015 Soundfield System
Thank you for choosing Sennheiser!
Over half a century of accumulated expertise in the design and manufacture
of high-quality electro-acoustic equipment have made Sennheiser a worldleading company in this field.
We have designed this product to give you reliable operation over many
years. Please take a few moments to read these instructions carefully, as we
want you to enjoy your new Sennheiser product quickly and to the full.
About the instruction manual
The instruction manual consists of several parts:
38
•
This part of the instruction manual contains a detailed and complete
description of the system.
•
The enclosed Quick Fix briefly explains the operation of the devices and
should therefore always be kept with the system.
•
The table “Settings” provides space to record the most important settings
such as channel number, frequency, volume level, etc. of each system.
With larger installations, this provides for simpler monitoring of the system
settings.
1 Contents
Chap. Contents
1
2
3
4
5
Page
Contents ......................................................................................... 39
Area of application....................................................................... 40
Cautions and advisories .............................................................. 41
Delivery includes .......................................................................... 41
Components of the Soundfield System .................................... 42
EMP 2015 receiver/amplifier combination .......................................... 42
SK 500 bodypack transmitter .............................................................. 43
6 Getting ready................................................................................. 44
EMP 2015 receiver/amplifier combination .......................................... 44
SK 500 bodypack transmitter ............................................................... 44
ME 3 headmic ....................................................................................... 45
Installing the basic system ..................................................................... 46
Turning the system components on and off ......................................... 48
Operation ............................................................................................... 49
Buttons ................................................................................................... 49
LC display panels .................................................................................. 49
Connecting external audio devices ....................................................... 51
Connecting FM systems for persons with impaired hearing ............... 52
7 Special applications .................................................................... 53
Installing a system with up to eight loudspeakers ................................ 53
Connecting sound recording devices ................................................... 55
Installing a system including several transmitters
(team teaching) ...................................................................................... 56
Installing a system including two transmitters and an audio device ... 57
Recommendations and tips ................................................................... 58
8 Special adjustments .................................................................... 59
Basic functions of the Sennheiser operating menu .............................. 59
Adjusting the sensitvity (transmitter only) ........................................... 60
Adjusting the squelch threshold (receiver section only) ...................... 61
Selecting the content of the standard display ....................................... 61
Configuring a frequency memory ........................................................ 62
Operating steps for configuring a frequency memory ......................... 62
Activating/deactivating the lock mode ................................................. 64
Acoustically adapting the Soundfield System to a room ..................... 65
9 Care and maintenance ................................................................ 66
Replacing the windscreen ...................................................................... 66
10 Troubleshooting ............................................................................ 67
Error checklist ....................................................................................... 67
11 Recommended accessories ....................................................... 69
12 Specifications ............................................................................... 70
EMP 2015 receiver/amplifier combination .......................................... 70
SK 500 bodypack transmitter ............................................................... 70
39
2 Area of application
The EMP 2015 Soundfield System is a matched combination of a bodypack
transmitter, a microphone and a receiver with an integrated power amplifier.
The use of advanced PLL and microprocessor technology combined with
the HDX noise reduction system and the latest amplifier technolgy ensure
extremely reliable transmission and excellent sound quality.
An extensive range of accessories enable the Soundfield System to be adapted
to a wide variety of applications.
40
3 Cautions and advisories
Never open electronic devices! This must only be done by authorized
personnel and is all the more important for devices connected to AC outlets.
If devices are opened by customers in breach of this instruction, the warranty
becomes null and void.
Always disconnect the devices from the mains by removing the plug when
you wish to change connections or move the devices to a different place.
Keep the devices away from central heating radiators and electric heaters.
Never expose them to direct sunlight.
To ensure sufficient ventilation of the device, do not cover the ventilation
apertures at the side panels.
Use the system in dry rooms only.
Use a damp cloth for cleaning the devices. Do not use any cleansing agents
or solvents.
Please protect your hearing and, when using the Soundfield System, set the
volume to safe levels! Constant exposure to high sound levels can cause
permanent hearing damage.
Never connect the loudspeaker cables to the ground and never allow the
cables to come into contact with another cable or metal casing parts. This
can cause a short circuit and may damage your loudspeaker.
SK 500 bodypack transmitter
4 Delivery includes
The EMP 2015 Soundfield System consists of the following components:
ME 3 headmic
•
•
•
•
•
•
SK 500 bodypack transmitter with transmitting antenna
EMP 2015 receiver/amplifier combiantion with receiving antenna
ME 3 headmic
Power cord
9 V PP3 battery (IEC 6 LR 61)
Instruction manual, Quick Fix, table “Settings”
EMP 2015 receiver/amplifier combination
41
5 Components of the Soundfield System
EMP 2015 receiver/amplifier combination
The heart of the Soundfield System is the EMP 2015 receiver with an
integrated power amplifier to which you can connect additional audio and
sound recording devices as well as FM systems for persons with impaired
hearing.
ON / STAND BY operating switch
Volume control for external audio devices (LINE IN)
Volume control for wireless microphone (MICROPHONE)
SET button
ON / OFF button (receiver section)
& LC display
button (UP)
' button (DOWN)
POWER indicator
Line input sensitivity control (LINE IN)
Line output level control (LINE OUT)
Level control for loudspeaker outputs FRONT-L and FRONT-R
(FRONT VOL)
The rear cover contains the enlarged Bass control (BASS) (< 200 Hz)
overview drawings as fold-out.
Treble control (TREBLE) (> 4.5 kHz)
Loudspeaker outputs (REAR 1, REAR 2, FRONT 1, FRONT 2)
RCA sockets, inputs for external audio devices (LINE IN)
RCA sockets, outputs for external sound recording devices or FM systems
for persons with impaired hearing (LINE OUT)
Antenna socket
2-pin AC socket for connection of power cord (AC POWER IN)
Mains switch
42
SK 500 bodypack transmitter
The bodypack transmitter transmits the signals of the connected microphone
to the receiver section of the EMP 2015.
Antenna
Red LED for operation and battery status indication (ON/LOW BAT)
Yellow LED for audio peak (AF PEAK)
Cover plate for battery compartment
Cover plate for display and operating controls
Microphone and line input (MIC/LINE),
3.5 mm jack socket
MUTE switch (mutes the transmitter’s audio signal)
The rear cover contains the enlarged SET button
overview drawings as fold-out.
ON / OFF button
LC display
button (DOWN)
button (UP)
43
6 Getting ready
EMP 2015 receiver/amplifier combination
Setting up the EMP 2015
The EMP 2015 is equipped with a temperature-controlled ventilation system.
To ensure sufficient ventilation, please make sure that the ventilation apertures
at the side panels are not covered. An integrated temperature monitoring
device protects the EMP 2015 against overheating by turning it off if the
temperature rises above a certain value. After sufficient cooling, the EMP 2015
is automatically turned on again.
Connecting the antenna and preparing the mains connection
Antenna
씰
Connect the supplied telescopic antenna to the BNC socket at the
rear of the EMP 2015 and lock the bayonet catch.
씰
Pull out the antenna and align it.
Note:
For optimum reception, align the transmitting and receiving antenna
vertically.
Mains connection
씰
Plug the power cord into socket at the rear of the EMP 2015.
SK 500 bodypack transmitter
Inserting and replacing the battery
!
씰
Slide the cover of the battery compartment in the direction of the
embossed arrow until it clicks audibly.
씰
Open the cover.
씰
Insert the 9 V PP3 battery (IEC 6 LR 61). Please observe correct polarity
when inserting the battery.
씰
Close the battery compartment.
씰
To remove the battery, push the red lever ! in the battery compartment
towards the bottom side of the transmitter.
Note:
If powered by a standard PP3 battery, the operating time of the transmitter is
approx. 6 hours. If powered by a rechargeable battery, the operating time is
approx. 4 hours. Special note on rechargeable battery operation: For
optimum operation, only use 9.6 V / 160 mAh NiMH batteries.
44
Connecting the antenna
씰
Screw the antenna onto the antenna socket (M3 connection).
Connecting the microphone
" $
씰
Connect the 3.5 mm jack plug " from the microphone cable to the jack
socket (MIC/LINE) .
씰
Lock the jack plug by screwing down the locking ring $.
Attaching the transmitter to clothing
The SK 500 transmitter is best attached to e.g. the belt with clip %.
The clip is detachable so that you can also attach the transmitter with the
antenna pointing downwards. To do so, withdraw the clip from its fixing
points and attach it the other way round.
%
ME 3 headmic
The ME 3 headmic is adjustable to comfortably and securely fit your head.
Positioning the microphone
The ME 3 is a directional microphone, i.e. the sound inlet should always
be directed towards the sound source (e.g. mouth). The sound inlet is marked
with a little dot.
45
Installing the basic system
The basic system consists of the EMP 2015 receiver/amplifier combination,
the SK 500 bodypack transmitter, a microphone and loudspeakers:
Installing the loudspeakers
The Soundfield System should generate a uniform sound field in the entire
room. The speaker’s voice should not be reproduced louder than normal
but should be heard at the same level everywhere in the room.
To generate a uniform sound field, you require at least several loudspeakers
for wall or ceiling mounting.
Install the loudspeakers so that two loudspeakers are not exactly facing each
other. This can lead to cancellations, resulting in a non-uniform sound field.
46
Connecting the loudspeakers
The EMP 2015 has four independent power amplifiers. Therefore, you can
connect up to eight loudspeakers to the EMP 2015 Soundfield System.
When installing a system with up to eight loudspeakers, make sure that
the individual loudspeakers have an impedance from 4 to 8 ohms.
The peak pulse power must be 30 W minimum.
When using more than one loudspeaker, make sure that the individual
loudspeakers have the same polarity (+/–).
Danger of short circuit!
Never connect the loudspeaker cables to the ground and never allow
the cables to come into contact with another cable or metal casing parts.
During operation, the ends of the loudspeaker cables must never come
into contact. This can cause a short circuit and may damage your speaker.
씰
Connect a loudspeaker cable to each loudspeaker.
씰
Connect each loudspeaker separately to the amplifer. Do not connect in
“daisy-chain” configuration.
씰
Connect one loudspeaker to each loudspeaker output .
47
Turning the system components on and off
Turning the amplifier on/off
The amplifier is fitted with both a mains switch and an operating switch
. Via the mains switch, the amplifier can be disconnected from the mains
(position “0”). The mains switch can always remain set to “I”.
씰
When putting the system into operation, turn the amplifer on by setting
the mains switch to “I”. The mains switch can then remain set to “I”.
씰
During normal operation, turn the amplifier on or off by using the operating
switch .
씰
To disconnect the amplifier from the mains, set the mains switch to “0”.
Turning the receiver section on/off
The receiver section is fitted with a separate ON / OFF switch which can
always remain set to “ON”.
Adjusting the volume of the microphone
Set the MICROPHONE volume control to “0” before you turn the
amplifier on. Adjust the volume of the microphone after turn-on.
Adjusting the volume of connected audio devices
Set the LINE IN volume control to “0” before you turn the amplifier on.
Adjust the volume of the connected audio devices after turn-on.
Note:
With the two volume controls and (, the microphone and LINE IN
signals can be mixed for reproduction at the loudspeaker output.
Turning the transmitter on/off
씰
Slide back the cover plate .
씰
Press the ON / OFF button to turn the transmitter on. The red LED lights up.
씰
To turn the transmitter off, press and hold the ON / OFF button until
“OFF” appears on the display. You can then release the button. The red
LED goes off.
Muting the transmitter
Use the MUTE switch to noiselessly mute the transmitter’s audio signal
(this switch does not turn off the transmitter).
48
Operation
Transmitter and receiver section of the Soundfield System have been factorypreset to allow immediate use after system installation and turn-on. For
excellent speech intelligibility, however, make sure that the transmitter
sensitivity is adjusted correctly ( “Adjusting the sensitivity”).
Buttons
SET Press the SET button
– to select a menu,
– to change to the next menu,
– to return to the top menu level.
Press the UP button
– to adjust the setting of a menu.
Press the DOWN button
– to adjust the setting of a menu.
LC display panels
Receiver
8-step level display for received audio signal (AF level)
6-segment alphanumeric main display
8-step level display for received RF signal (RF field strength)
Transmitter
6-segment alphanumeric main display
3-step display for battery status
49
Battery status indication
The red LED and the 8-segment bargraph on the display provide
information on the battery status.
Bargraph:
The bargraph indicates the (remaining) battery capacity in 3 steps:
8 segments: the full battery capacity is available,
4 segments: the battery capacity is sufficient,
1 segment:
the battery is going flat, immediately replace the battery.
Note:
When turning on the transmitter with a partially used battery, it is possible
that all eight segments may show for a short period of time – if this happens,
re-check battery status after a few moments.
Red LED:
Red LED lit up:
Red LED starts flashing:
The transmitter is turned on and the
battery capacity is sufficient.
The battery is going flat! You should
immediately replace the battery.
Peak indication
The yellow LED at the top of the SK 500 transmitter lights up if the
audio signal at the microphone/line input is excessively high (AF PEAK).
50
Note:
The sensitivity of the microphone/line input can be adjusted via the
operating menu ( “Adjusting the sensitivity”).
Connecting external audio devices
You can connect two mono or two stereo audio devices to the amplifier.
씰 Connect the RCA plugs of the sound recording devices to the RCA sockets
(LINE IN) at the rear of the EMP 2015. For correct connection of the
different audio devices, please refer to the diagrams at the left.
Note:
Stereo (left-right) signals are mixed in the amplifier and are then available
as a mono signal.
2 mono audio devices
씰 If possible, set stereo audio devices to “mono” operation. If sound
problems occur, use the left channel of TVs and VCRs.
1 stereo audio device
2 stereo audio devices
Adjusting the volume of an external audio device
You can adjust the volume of the connected audio device (e.g. VCR) separately
from the volume of the speaker’s microphone. If, however, you have connected
two audio devices to the line input, the volume control adjusts the volume of
both devices.
씰
Use the volume control (LINE IN) to adjust the volume of the
connected device.
Note
If the audio signal sounds distorted, reduce the sensitivity of the system
with control . If control is turned counterclockwise as far as possible,
the audio signal may not be audible.
51
Connecting FM systems for persons with impaired hearing
You can connect an FM transmitter of an FM system of any manufacturer to
each of the two line outputs (LINE OUT) .
The FM transmitter transmits the signals of one or several speakers and, if
connected, an audio device to the FM receiver of the hearing impaired. As a
result, the speaker doesn’t have to wear several transmitters and microphones
but only the transmitter and the microphone of the Soundfield System. In
addition, the use of the Soundfield System ensures excellent sound quality.
EMP 2015 with two FM systems
For connecting an FM transmitter, you require a connecting cable fitted with
an RCA plug and a 3.5 mm jack plug. (Some FM transmitters are fitted with
a 2.5 mm jack socket.)
씰
Connect the RCA plug of the connecting cable to one of the two RCA
sockets (LINE OUT) at the rear of the EMP 2015.
씰
Connect the 3.5 mm jack plug of the connecting cable to the line input of
the FM transmitter.
Adjusting the output level for FM transmitters
All standard FM transmitters are fitted with a line or audio input which
should be used for connecting the transmitter. In general, the line output
level control (LINE OUT) on the EMP 2015 should be turned clockwise
as far as possible.
Testing the FM system
Before you use an FM system for the first time, connect it to the Soundfield
System as described above and test it via monitoring headphones to ensure
problem-free operation.
If the speaker’s voice sounds distorted, reduce the line output level by turning
control counterclockwise.
52
7 Special applications
Installing a system with up to eight loudspeakers
By connecting two loudspeakers to each loudspeaker output, you can connect
up to eight loudspeakers to the Soundfield System:
The Soundfield System should generate a uniform sound field in the entire
room. Therefore, install the loudspeakers so that two loudspeakers are not
exactly facing each other. This can lead to cancellations, resulting in a nonuniform sound field.
53
Connecting the loudspeakers
When installing a system with up to eight loudspeakers, make sure that
the individual loudspeakers have an impedance from 4 to 8 ohms.
The peak pulse power must be 30 W minimum.
When using more than one loudspeaker, make sure that the individual
loudspeakers have the same polarity (+/–).
Danger of short circuit!
Never connect the loudspeaker cables to the ground and never allow the
cables to come into contact with another cable or metal casing parts.
During operation, the ends of the loudspeaker cables must never come
into contact. This can cause a short circuit and may damage your speaker.
54
씰
Connect a loudspeaker cable to each loudspeaker.
씰
Connect each loudspeaker separately to the amplifer. Do not connect in
“daisy-chain” configuration.
씰
Connect two loudspeakers to each loudspeaker output .
Connecting sound recording devices
You can connect sound recording devices (e.g. tape recorder, dictating
machine, etc.) to the RCA sockets (LINE OUT) of the amplifer. The
connected device records the same signal that can be heard in the room
through the loudspeakers. If possible, connect the sound recording device
via its line input (LINE IN, REC. IN, AUX IN, TB IN or similar).
씰
2 mono sound recording devices
Connect the RCA plugs of the sound recording devices to the RCA sockets
(LINE OUT) at the rear of the EMP 2015. For correct connection of
the different audio devices, please refer to the diagrams at the left.
1 stereo sound recording device
Adjusting the recording level
The recording level is independent of the setting of the volume controls )
and (. It is, however, dependent on the setting of the line input sensitivity
control (LINE IN) . Control adjusts the input level of the connected
audio device.
The recording level of the line output can be adjusted from 0 to 700 mVrms
(corresponds to minus infinite to up to 0 dBU).
1. The sound recording device is connected via its line input (LINE IN,
REC. IN, AUX IN, TB IN or similar):
씰
Turn control clockwise as far as possible and adjust the input level
of the sound recording device.
2. The sound recording device is connected via its microphone input:
씰
Set the input level of the sound recording device to maximum and
use control to adjust the recording level so that, during loud
passages, distortion is avoided.
Note:
If control is turned counterclockwise as far as possible, no audio signal
will be available at the line output .
If you have connected two mono sound recording devices, the control adjusts
the recording level of both devices.
55
Installing a system including several transmitters
(team teaching)
With one Soundfield System, up to three speakers can speak simultaneously
in the same room.
Transmitter 1 is directly received by the receiver section of the EMP 2015.
Transmitters 2 and 3 require an additional receiver respectively. The receivers
can be connected to the RCA sockets (LINE IN) of the EMP 2015. The
signals of all transmitters are then reproduced by the loudspeakers.
For installing the system described above, you require additional SK 500
bodypack transmitters and EM 500 rack-mount receivers ( “Recommended
accessories”).
Connecting an EM 500 receiver
For connecting an EM 500 receiver, you require a connecting cable fitted
with an 1/4” (6.3 mm) jack plug and an RCA plug ( “Recommended
EMP 2015 with three transmitters and accessories”).
two additional receivers
씰 Prepare the receiver for use as described in the receiver’s instruction
manual.
씰
Connect the RCA plug of the connecting cable to one of the two RCA
sockets (LINE IN) of the EMP 2015.
씰
Connect the 1/4” (6.3 mm) jack plug of the connecting cable to the
1/4” (6.3 mm) jack socket of the receiver.
씰
Set the transmitter and receiver of each transmission link to the same
frequency.
Note:
Transmitter and receiver of each transmission link have to operate on the
same frequency which must differ from the frequencies used by other
transmission links in the room. With both the transmitter and receiver of the
Soundfield System and the additional S K 500 transmitters and
EM 500 receivers you can change the frequencies and store them in one of
the 16 fixed frequency memories ( “Operating steps for configuring a
frequency memory”).
Adjusting the volume of the connected receivers
씰
Use the volume control (LINE IN) to adjust the volume of the
connected receiver.
Note:
If you have connected two receivers to the line input, the volume control
adjusts the volume of both receivers.
56
Adapting the system sensitvity to the connected receivers
씰
Turn the line input sensitivity control (LINE IN) clockwise as far as
possible.
씰
Adjust the output level on the EM 500 receiver as described in the
receiver’s instruction manual.
Installing a system including two transmitters and an
audio device
You can also connect an additional receiver and an external audio device
(e.g. VCR) to the two line inputs (LINE IN) of the EMP 2015. With
such a system, the signals of two speakers speaking simultaneously and the
signals of a VCR or similar are then reproduced by loudspeakers in the
room. (In addition, you can connect sound recording devices to the two line
outputs (LINE OUT) of this system.)
To install this system, please proceed as described in the chapters “Installing
a system with several transmitters (team teaching)” and “Connecting external
audio devices”.
57
Recommendations and tips
... for the ME 3 headmic
Always use the microphone with a windscreen and position the microphone
at the corner of the mouth.
You can vary the bass reproduction by increasing/decreasing the talking
distance.
Make sure that the sound inlet is directed towards the mouth. The sound
inlet is marked with a little dot.
... for the SK 500 bodypack transmitter
For optimum transmission quality, make sure that the antenna and the
microphone cable do not cross.
... for optimum reception
Transmission range depends to a large extent on location and can vary
from about 10 m to about 150 m.
If reception conditions are unfavourable, you should use a remote receiving
antenna (available as an accessory) which is connected via antenna cable.
Observe a minimum distance of 50 cm between the receiving antenna
and metal objects (such as cross members or reinforced-concrete walls).
58
8 Special adjustments
Basic functions of the Sennheiser operating menu
With the Soundfield System, all necessary adjustments to the transmitter
and receiver section settings can be made by using the SET and and buttons. The settings are indicated on the respective displays.
Important:
After turn-on, press the / buttons to switch between the factorypreset fixed frequency memories. The display starts flashing. Your
selection becomes effective immediately. Press the SET button to
acknowledge your selection. The flashing stops.
1. Press the SET button to enter the top menu level:
By briefly pressing SET again, you can change to the next menu.
After approx. one second, the selected menu appears on the display and
then the current setting of the menu is indicated.
2. Press the / buttons to adjust the settings of the selected menu:
The new setting starts flashing on the display. If you return to the previous
setting, the flashing stops.
Important:
New settings become effective immediately and will be
retained in memory on turn-off!
N.B.: When changing transmitter frequencies, care should be
taken to avoid causing interference to other channels/users.
In the “tunE” and “Ch no” menu, the / buttons feature a “fast search”
function. If you briefly press the / buttons, you can jump either forwards
or backwards to the next setting. If you press and hold down a button,
you can scroll through the settings.
3. Press the SET button to return to the top menu level:
Have you finished your entries? Press the SET button to return to the top
menu level. The display then switches back to the standard setting.
59
SenSit
Adjusting the sensitvity (transmitter only)
If the microphone sensitivity is not adjusted correctly, the speaker’s voice
can sound distorted or noisy. Distortion occurs if the microphone sensitivity
is adjusted too high. In this case, the transmitter’s yellow audio peak indication
LED lights up . If, on the other hand, the sensitivity is adjusted too low,
the teacher’s voice will be overlaid with background noise.
Adjust the sensitivity so that the yellow audio peak indication LED only
lights up during the loudest passages.
The following figures are a guide to the best settings:
ME 3 headmic:
-10 dB
ME 2 and ME 4 microphones (accessories):
0 dB
External sound sources (e.g. CD player):
-30 / -20 dB
60
씰
Press the SET button to select the “SEnSit” menu. “SEnSit” appears on
the display; after a short pause the current input sensitivity setting is
indicated.
씰
With the / buttons you can now select a different setting. The sensitivity
can be adjusted in 10-dB steps from 0 to -30 dB. The new setting starts
flashing on the display and becomes effective immediately.
씰
Press the SET button to return to the top menu level. The display then
switches back to the standard display.
SqELCH
Adjusting the squelch threshold (receiver section only)
The amplifier’s receiver section is equipped with an adjustable squelch which
eliminates annoying noise when the transmitter is turned off. It also suppresses
sudden noise when the transmitter leaves the reception area.
씰
Press the SET button to select the “SqELCH” menu. “SqELCH” appears on
the display; after a short pause the current squelch setting is indicated.
씰
With the / buttons you can now select a different setting. The squelch
can be turned off (0 dB) or adjusted in 5-dB steps from 5 dB to 40 dB.
(Selecting a smaller value reduces the squelch threshold, selecting a higher
value increases the squelch threshold.) The new setting starts flashing on
the display. Set the squelch threshold – with the transmitter turned off –
to the lowest possible value that suppresses hissing noise. With the squelch
set to a high value, the receiver section will be less sensitive to interference
but, on the other hand, the transmission range will be reduced.
Note:
If the receiver’s squelch is set to “0 dB” and you turn the transmitter off,
hissing noise with high dynamics will occur.
씰
DiSPL
Press the SET button to return to the top menu level. The display then
switches back to the standard display.
Selecting the content of the standard display
With both transmitter and receiver section you can choose the content of the
standard display i.e. whether the frequency (in MHz) or the channel number
is displayed.
씰
Press the SET button twice to select the “DiSPL” menu. “DiSPL” appears
on the display; after a short pause the current setting is indicated.
씰
With the / buttons you can now choose between:
Frequency:
Channel number:
“FrEqu”
“ChAnnL”
The new setting for the standard display starts flashing on the display.
씰
Press the SET button to return to the top menu level. The display then
switches to the new standard display.
61
Configuring a frequency memory
Transmitter and receiver section of the Soundfield System have 16 switchable
frequency memories respectively to store up to 16 transmission and receiving
frequencies. The 16 factory-preset transmission/receiving frequencies are all
intermodulation-free, i.e. you could operate up to 16 transmission links
simultaneously in the same room.
If you use more than 16 Soundfield Systems in neighboring rooms, a
minimum spacing of 400 kHz between two carrier frequencies must be
maintained. Within the 32 MHz frequency window, you can therefore operate
up to 80 systems without having to use a frequency twice.
Note:
In contrast to the Soundfield System, standard FM systems operate in the
VHF band so that both systems cannot interfere with each other.
Operating steps for configuring a frequency memory
1. Select a frequency memory
씰
Press the / buttons to select a factory-preset fixed frequency memory.
The display starts flashing. Your selection becomes effective immediately.
씰
Press the SET button to acknowledge your selection. The display stops
flashing. (If the SET button is not pressed, the device will store the new
setting automatically on turn-off.)
Note:
You can choose the content of the standard display i.e. whether the
frequency or the channel number is displayed ( “Selecting the content
of the standard display”). The devices are factory-preset to show the
frequency setting as standard.
tunE
2. Select a different frequency
씰
Press the SET button three times to select the “tunE” menu. “tunE” appears
on the display; after a short pause the currently set frequency is indicated.
씰
With the / buttons you can now select a different frequency. The
frequencies are tunable in 25-kHz steps. The new frequency starts flashing
on the display and becomes effective immediately.
씰
Press the SET button to return to the top menu level. The display then
switches back to the standard display.
Important note:
Set the transmitter AND the receiver to exactly the same frequency!
62
Ch no
3. Assign a channel number
You now have to assign the frequency memory a channel number (from 0 to
255). If you use several Soundfield Systems in neighboring rooms, you can
assign channel numbers 1 – 16 to one group of transmitters and receivers
and channel numbers 17 – 32 to the next group, etc. The 16 fixed frequency
memories are factory-preset to channel numbers 01 – 16.
씰
Press the SET button four times to select the “Ch no” menu. “Ch no”
appears on the display; after a short pause the currently assigned channel
number is indicated.
씰
With the / buttons you can now select a different channel number.
The new channel number starts flashing on the display and becomes
effective immediately.
Note:
Channel numbers which have already been assigned to a fixed
frequency memory are skipped!
씰
Press the SET button to return to the top menu level. The display then
switches back to the standard display.
Note:
Use the same channel number for both transmission and receiving
frequency!
63
Loc
Activating/deactivating the lock mode
After you have finished your entries, you can lock the buttons on the
transmitter and the receiver section to prevent accidental programming or
turning off during operation.
Activating the lock mode
씰
Press the SET button five times to select the “Loc” menu. The current
setting is indicated on the display.
씰
Press the button to activate the lock mode. “Loc on” starts flashing on
the display.
씰
Press the SET button to return to the top menu level.
Note:
The / buttons or the ON/OFF button are now locked. To turn the
transmitter off, first deactivate the lock mode.
Deactivating the lock mode
64
씰
Select the “Loc” menu by pressing the SET button. “Loc on” appears on
the display.
씰
Press the button to deactivate the lock mode. “Loc OFF” begins to flash
on the display.
씰
Press the SET button to return to the top menu level. The display switches
back to the standard display and the buttons can now be operated as
usual.
Acoustically adapting the Soundfield System to a room
Before you use the Soundfield System for the first time in a room, you should
acoustically adapt it to the room.
씰
Turn on both the bodypack transmitter and the microphone.
씰
Reset the two volume controls and on the amplifier to “0”.
씰
Turn on the amplifer.
씰
Adjust the volume of the microphone so that the speaker’s voice can be
clearly understood but doesn’t sound unnaturally loud. In long, narrow
rooms it might be advisable to reduce the level of the front loudspeakers
compared to that of the rear loudspeakers by means of the loudspeaker
output level control , since the speaker’s voice additionally supports
the front part. You can reduce the level of the front loudspeakers compared
to that of the rear loudspeakers by up to 12 dB.
씰
Use the bass control and the treble control to adapt the sound of
the voice to both the acoustic situation in the room and the characteristics
of the connected loudspeakers.
씰
Many of the sounds which are important for speech intelligibility are in
the high frequency range above 4 kHz. Hissing noise and so-called plosives
([s], [t], [f], etc.) mainly consist of high frequencies. In order to ensure
that the speaker can be clearly understood, use the treble control to
adjust the treble response to a sufficient value. If the high frequencies are
enhanced too much, the voice sounds “sharp”, which might be disturbing
in the long run and increases the risk of feedback.
씰
Use the bass control to set the bass response so that the voice doesn’t
“hum”. Since the low frequencies are not that important for speech
intelligibility, it might be advisable to adjust the bass response to a
comparatively low level during classes.
65
9 Care and maintenance
The components of the Soundfield System should be cleaned from time to
time. Use a damp cloth for cleaning. Do not use solvents or solvent-containing
cleansing agents as these could damage the surface of the components.
Replacing the windscreen
If the windscreen shows signs of wear such as tears or holes, replace the
windscreen. To do so, pull the old windscreen from the microphone and
gently slide on the new one.
66
10 Troubleshooting
Error checklist
Problem
Possible cause
What to do
You hear whistling noise
Microphone volume is adjusted
too high
Reduce the volume with the
microphone volume control
No operation indication
Battery is flat (transmitter)
No mains connection (EMP 2015)
Replace the battery
Check to see if the mains plug is
connected and if the amplifier is
turned on
No RF signal and
no audio signal
Transmitter and/or receiver section
are turned off
Transmission frequency is not the
same as the receiving frequency
Transmitting antenna is not connected
Turn the transmitter and/or
receiver section on
Set the transmitter and the
receiver section to the same
frequency
( “Special adjustments”)
Connect the antenna
Transmitter is muted (“MUTE”)
Deactivate the muting function
Receiver section’s squelch threshold
is adjusted too high
Adjust the squelch treshold to a
lower value ( “Adjusting the
squelch threshold”)
Connect the microphone
RF signal available but
no audio signal
Microphone is not connected
Microphone is covered or
positioned too far from the mouth
Increase the microphone
sensitivity on the transmitter
or the microphone volume on
the EMP 2015
Position the microphone at
the corner of the mouth
Speaker’s voice too loud
Microphone volume is adjusted
too high
Reduce the volume with the
microphone volume control
Speaker’s voice distorted
Transmitter sensitivity is adjusted
too high
Adjust the sensitivity to a lower
value ( “Adjusting the
sensitivity”)
Reduce the volume with the
microphone volume control
Speaker’s voice too soft
Microphone volume is adjusted
too low
Receiver section’s AF output level is
adjusted too high
Volume of sound reproducing
device adjusted too high
Volume at the line input is adjusted
too high
Reduce the volume of the
audio device with the
corresponding volume control
67
Problem
Possible cause
What to do
Dropouts
Speaker’s voice overlaid
with background noise
Antenna sensitivity is not sufficient
Use a remote or telescopic
antenna
Transmitting antenna is not connected
Connection of transmitting antenna
has worked loose
Transmission frequency is not the
same as the receiving frequency
Connect the antenna
Screw the antenna tight
Several transmitters in the same
room or in neighboring rooms
Microphone is covered or
positioned too far from the mouth
Transmission frequency is not the
same as the receiving frequency
Check the frequency settings
( “Special adjustments”)
Position the microphone at
the corner of the mouth
Set the transmitter and the
receiver section to the same
frequency
( “Special adjustments”)
Sound is not clear / rough
씰
68
Set the transmitter and the
receiver section to the same
frequency
( “Special adjustments”)
If problems occur that are not listed in the above table, please contact
your local Sennheiser agent for assistance.
11 Recommended accessories
ME 2 Clip-on microphone for SK 500,
condenser, omni-directional
ME 4 Clip-on microphone for SK 500,
condenser, cardioid
EM 500 Rack-mount receiver for operating an additional transmission link
SK 500 Bodypack transmitter for “team teaching”
Connecting cable for connecting an EM 500,
1/4” (6.3 mm) jack plug and RCA plug
GA 1 Rack adapter for EM 500,
for mounting two EM 500 into a 19” rack
DC 1 DC power adapter,
for external 12 V DC powering of SK/EK 500 (instead of 9 V PP3 battery)
69
12 Specifications
EMP 2015 receiver/amplifier combination
Amplifier section
Operating voltage
Power consumption
Fuse
AF output power
Harmonic distortion (at nom. dev., 1 kHz)
Line input
Receiver
Output impedance
Frequency response Line input
Receiver
Signal-to-noise ratio
(LINE OUT)
(SPEAKER OUT)
Temperature range
Protection class
Dimensions
Weight
230 V (EU and UK version)
115 V (US version)
< 3 W (stand by)
< 20 W (position “ON”)
< 200 W (max. rms level)
2 AT
4 x 10 W at 4 (rms)
4 x 20 W at 4 (peak)
0.5 %
1%
4 x 2…8 Ω
20 – 18,000 Hz
70 – 18,000 Hz
> 90 dBArms
> 80 dBArms
0 °C – 40 °C
2
210 x 70 x 205 mm
2,600 g
Receiver section
Modulation
Frequency ranges
Transmission/receiving frequencies
Switching bandwidth
Noise reduction system
Nominal deviation / peak deviation
Sensitivity (with HDX, peak dev.)
Antenna input
Antenna input impedance
FM mono
518 – 550, 630 – 662, 740 – 772, 790 – 822, 838 – 870 MHz
1280, tunable in steps of 25 kHz,
16 switchable fixed frequency memories
32 MHz
Sennheiser HDX
± 24 kHz / ± 48 kHz
< 2.5 µV
BNC
50 Ω
SK 500 bodypack transmitter
Modulation
Frequency ranges
Transmission/receiving frequencies
Switching bandwidth
RF output power at 50 Ω
Power supply
Max. current consumption at nom. voltage
Dimensions
Weight
70
FM mono
518 – 550, 630 – 662, 740 – 772, 790 – 822, 838 – 870 MHz
1280, tunable in steps of 25 kHz,
16 switchable fixed frequency memories
32 MHz
typ. 10 mW
9 V PP3 alkaline manganese battery (IEC 6 LR 61) or
9.6 V/160 mA rechargeable battery
approx. 40 mA
110 x 65 x 22 mm
approx. 255 g