Sennheiser EM 3032-U, EM 3031-U User Manual
EM 3031-U
Instructions for use
EM 3032-U
27
Thank you for choosing Sennheiser!
You have made an excellent choice. This product will give you reliable and cost-effective ease of
operation over many years. All of Sennheiser’s professional expertise and more than fifty years of
experience have gone into the creation of this state-of-the-art product.
Please take a few moments to read these instructions carefully. We want you to enjoy your new
receiver quickly and to the full.
Chapter Contents ............................................................................................................................. Page
1 Brief description, variants, special features ........................................................... 29
2 Connections and operating elements ..................................................................... 30
®
.................................................................................................................................................
3 Noise reduction with HiDyn
plus
4 Diversity reception .................................................................................................. 33
5 Assembly and mounting, assembly instructions ................................................... 34
6 Connection and mounting of remote antennæ...................................................... 36
7 Switching the mains voltage / Mains connection .................................................. 37
8 Putting the receiver into operation......................................................................... 38
9 Changing the receiving frequency ......................................................................... 39
10 Selection and combination of possible receiving frequencies............................... 40
11 Reprogramming the receiving frequencies – no problem! ................................... 41
12 Display of frequency groups................................................................................... 41
13 Power of the received radio signal ......................................................................... 32
14 Squelch (Muting), AF squelch ................................................................................ 32
15 Advanced muting function ..................................................................................... 43
16 Monitoring the sound signal, headphone connection .......................................... 44
17 Replacing a fuse....................................................................................................... 45
18 Sennheiser transmitters report their battery status ............................................... 46
19 Suitable Sennheiser transmitters ............................................................................ 47
20 Error messages ........................................................................................................ 48
21 Error checklist ......................................................................................................... 48
22 Safety instructions ................................................................................................... 48
23 Recommended accessories...................................................................................... 49
24 Technical data .......................................................................................................... 50
32
28
1 Brief description
With the EM 3031-U and EM 3032-U receivers, Sennheiser offers the professional user high
quality RF receivers with a high level of operational reliability and ease of use. The EM 3031-U
and EM 3032-U receivers together with the suitable hand-held and pocket transmitters permit
wireless transmission with studio quality sound. Due to further optimised PLL and microprocessor
technology and the Sennheiser patented HiDyn
systems surpass the signal-to-noise ratio and dynamic range of modern CD productions. The true
diversity technology of the EM 3031-U and EM 3032-U receivers ensures interference-free
transmission and minimises the drop-outs in the RF path.
Especially for small television studios and theatres, the simultaneous use of several EM 3031-U /
EM 3032-U receivers is an economical alternative to technically more sophisticated and therefore
more expensive multi-channel systems.
®
plus
noise reduction system, these transmission
Variants
EM 3031-U: Single-32-channel true diversitiy receiver
EM 3032-U: Two-32-channel true diversitiy receiver
Note
EM 3031-U and EM 3032-U differ in the fact that the EM 3032-U contains two
complete true diversity receivers in a single 1 U rack housing. These two receivers
are powered by a common mains power supply unit and via a common pair of
antennæ (antenna splitter integrated).
This manual is therefore always restricted to the description of just one receiver,
the operation of the second receiver in the EM 3032-U is similar.
Special features
PLL microprocessor control, programmable
Sennheiser HiDyn
High transmission reliability due to true diversity reception
Ease of use
“LOW BATT“ display for transmitter battery status
19" 1 U housing
Supply voltage for external antenna boosters
®
plus
noise reduction system
29
2 Connections and operating elements
Headphone socket 1/4 “ (6.3 mm) ø
Headphone volume control
Multi-function display panel
Buttons for selecting the receiving frequency
SET/storage button for channel programming
Changing the receiving frequency: Button
Buttons , or
Button for about 3 seconds
ON / OFF switch
30
Fuse holder and mains voltage selection
2-pin IEC mains connector
Squelch control
Straw relief clamp for mains cable
Service interface (not used in normal operation)
AF output XLR-3, balanced
Control for AF output level at the XLR socket
Antenna input B
Antenna input A
31
3 Noise reduction with HiDyn
plus
®
Progress you can hear:
This receiver is equipped with HiDyn
, the Sennheiser noise reduction system. HiDyn
plus
®
plus
reduces interference from the RF Line. It increases the signal-to-noise ratio in wireless audio
transmission to up to 110 dB. The dynamic range of a CD is a maximum of 96 dB (16-bit transducer)
and is thus surpassed considerably.
®
plus
HiDyn
is a wideband compander system which compresses the AF level on the transmitter
side in a ratio of 2:1 (related to dB), and expands it in an exactly the same way on the receiver side.
The optimisation of the dynamic range and the supporting effect of the control amplifier in the
transmitter effectively reduce modulation problems.
HiDyn
®
plus
has been developed for use in high quality radiomicrophone systems.
Note
Only transmitters which are also equipped with HiDyn
®
plus
can work perfectly in
combination with the EM 3031/3032 receiver. If this is not the case, the dynamic
range is drastically reduced, the transmission sounds blunt and flat. HiDyn
plus
®
can not be switched off on the EM 3031/3032 receiver.
®
32
receiver 1
AF-signal
electronic switching
from one signal to another
AF-signal
receiver 2
4 Diversity reception
The EM 3031/3032 receiver operates on the “true diversity” principle:
A receiving antenna receives not only the electromagnetic waves which reach it by a direct path,
but also the reflections of these waves which are created in the room by walls, windows, ceilings
and fittings. When these waves are superimposed, destructive interference occurs, which can also
be called “field strength gaps”. Repositioning the receiving antenna can bring a solution, provided
the transmitter remains in its original position. With mobile transmitters, however (which all
radiomicrophones are ), the “field strength gap“ will then occur with a different transmitter position.
These “field strength gaps“ can only be eliminated with true diversity receivers.
In true diversity, instead of one antenna and one receiver there are now two antennæ and two
receiver sections. The antennæ are spatially separated. By means of a comparison circuit, the
receiver section with the strongest RF signal is always switched to the common AF output. The
risk of the occurrence of “field strength gaps” in both antennæ at the same time is virtually
nonexistant.
The display panel of the receiver always shows whether the diversity channel switched is channel
A or channel B.
33
5 Assembly and mounting
Use as a stand-alone receiver
For use as a stand-alone receiver, it is recommended that the supplied telescopic antennæ are used.
They can be mounted quickly and easily to the rear of the receiver and are suitable for all applications
where – good reception conditions provided – a wireless transmission system is to be used without
a large amount of installation work.
To ensure that the receiver is securely mounted
on a surface on which it can not slip, four selfadhesive soft rubber feet are supplied. These feet
are stuck into the recesses on the lower side of
the receiver.
Ensure that the recesses are clean and free from
grease before mounting the feet.
N.B.
Do not use these feet if rack-mounting
the receiver.
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