Sennheiser ew 300 IEM User manual

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INSTRUCTION MANUAL evolution wireless
In-Ear Monitoring System
ew 300 IEM

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1 Contents
Chap. Contents Page
1 Contents............................................................................................ 34
2 Short description .............................................................................. 35
3 System components .......................................................................... 35
4 Important notes ................................................................................ 35
5 Preparing the devices for use ........................................................... 37
SR 300 IEM stereo transmitter ................................................. 37
EK 300 IEM stereo pocket receiver .......................................... 40
6 Operation .......................................................................................... 43
7 Troubleshooting ............................................................................... 54
8 Care and maintenance ..................................................................... 55
9 Overview .......................................................................................... 56
Wireless transmission system .................................................... 56
HDX noise reduction.................................................................... 57
Technical data ............................................................................. 58
Accessories .................................................................................. 60
Thank you for choosing Sennheiser!
We have designed these products 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 products quickly and to the full.

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2 Short description
With the Sennheiser evolution wireless in-ear monitoring system ew 300 IEM
(suitable for both stage and broadcast use), 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 evolution wireless in-ear monitoring system ew 300 IEM is a high-
quality state-of-the-art RF transmission system with a high level of operational
reliability and ease of use. Transmitter and receiver permit wireless
transmission with studio-quality sound. Due to further optimised PLL and
microprocessor technology and the HDX noise reduction system, this
transmission system ensure interference-free transmission and minimise
dropouts in the RF link.
The system can be supplied in five frequency ranges within the UHF band.
Please note: Frequency usage is different for each country. Your Sennheiser
agent will have all the necessary details on the available legal frequencies for
your area.
Range A: 518 – 550 MHz,
Range B: 630 – 662 MHz,
Range C: 740 – 772 MHz,
Range D: 790 – 822 MHz,
Range E: 838 – 870 MHz.
Transmitter and receiver of the Sennheiser ew 300 IEM system are 8-channel
switchable. Transmitter and receiver have 8 frequency memories to store up
to 8 transmission/receiving frequencies. The frequencies are selectable in
25-kHz steps, giving a selection of 1280 frequencies within the preset
32 MHz frequency range.
The system has 8 factory pre-programmed frequencies, so that
– the system is ready for immediate use after switch-on,
– several in-ear monitoring systems can be operated simultaneously on the
factory-preset transmission and receiving frequencies without causing
intermodulation interference. However, all frequency settings can be
changed to your individual needs, if required.
3 System components
The system consits of: EK 300 IEM stereo receiver, SR 300 IEM stereo
transmitter, 9 V PP3 alkaline battery, transmitting antenna and receiving
antenna, NT 2 mains unit, IE 1 in-ear headphones, user manual.
4 Important notes
Never open electronic devices! This must only be done by authorised
personnel and is all the more important for units 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.

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Keep the devices away from central heating radiators and electric heaters.
Never expose them to direct sunlight.
Use the devices in dry rooms only.
Use a damp cloth for cleaning the devices. Do not use any cleansing agents
or solvents.
Attention! High Volume!
This is a professional transmission system. Commercial use is subject to the
rules and regulations of the trade association responsible. 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 simple formula applies:
Double the volume = half the duration
An increase of 3 dB corresponds to doubling the volume; you can thus go by
the following table:
Maximum duration at a sound pressure of:
8 hours 85 dB
4 hours 88 dB
2 hours 91 dB
1 hour 94 dB
30 minutes 97 dB
15 minutes 100 dB
8 minutes 103 dB
4 minutes 106 dB
2 minutes 109 dB
1 minute 112 dB
Pain threshold 120 dB
The following are sure signs that you have been subjected to excessive noise
for too long a time:
You can hear ringing or whistling sounds in your ears.
You have the impression (even for a short time only) that you can no
longer hear high notes.
After using this system, your hearing is impaired for a short time.
In all of the above cases, you should consult a specialist or at least have your
hearing tested. Ear damage builds up gradually. Once the initial symptoms
have died down, you no longer perceive acute changes. In the long term,
however, the repeated effects of loud noises can cause severe hearing
impairment or even deafness.

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Headphone output, 1/4” (6.3 mm) jack socket (PHONES)
Headphone volume control (VOL)
LC display
button (UP)
button (DOWN)
SET button
POWER (ON/OFF) button
Cable grip for power supply DC cable
DC socket for connection of mains unit (DC-IN)
Audio input, 1/4” (6.3 mm) jack socket (left and MONO)
(AF IN BAL/UNBAL)
Audio input, 1/4” (6.3 mm) jack socket (right)
(AF IN BAL/UNBAL)
BNC socket, antenna output (ANT)
5 Preparing the devices for use
SR 300 IEM stereo transmitter

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Mounting the rubber feet
To ensure that the transmitter cannot slip on the surface on which it is placed,
four self-adhesive soft rubber feet are supplied. These feet are stuck into the
recesses on the bottom side of the receiver. (N.B.: Do not use these feet if
rackmounting the transmitter).
씰Ensure that the recesses are clean and free from grease before fixing
the feet.
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 discolouration, since we don’t
know your furniture.
Connecting the antenna
The SR 300 IEM transmitter can be used with either a telescopic antenna
(supplied) or a remote antenna (available as an accessory).
The supplied telescopic antenna can be mounted quickly and easily to the
rear of the transmitter 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.
씰Connect the telescopic antenna to BNC socket at the rear of the
transmitter and pull the end cap to extend the antenna.
If the transmitter position is not the best antenna position for optimum
transmission, you can use a remote antenna (available as an accessory).
Connecting the mains unit
씰Insert the DC connector on the power supply output cable into socket
at the rear of the transmitter.
씰Pass the cable through the cable grip , as illustrated.

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Connecting the pre-amplifier/mixing console
씰Connect the outputs from the pre-amplifier/mixing console/etc. to the
1/4” (6.3 mm) jack sockets (left or MONO) and (right).
Both balanced and unbalanced connection is possible.
Note:
Any device that is only suitable for mono operation must be connected
to jack socket . In this case, the stereo operation must be switched
off via the menu.
Switching the transmitter on/off
씰Press the POWER button to switch the transmitter on.
씰To switch the transmitter off, press the POWER button until “OFF”
appears on the display. You can then release the button.
After a power failure, the device returns to the previous setting (ON/OFF).
Connecting the headphones/monitoring the audio signal
씰Connect the headphones to the headphone output (PHONES) 
for monitoring the audio signal. Only connect headphones with a
1/4” (6.3 mm) stereo jack plug.
씰Use the headphone volume control to adjust the volume.
Attention: First set the volume control to the lowest volume by turning
it to the left as far as possible!
Volume up? – NO!
When people use headphones, they tend to choose a higher volume
than with loudspeakers. Listening at high volume levels for long
periods can lead to permanent hearing defects. Please protect your
hearing, Sennheiser headphones have an excellent sound quality even
at low volumes.
1/4” (6.3 mm) jack plug
balanced unbalanced
1/4” (6.3 mm) stereo jack plug
for headphone connection

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EK 300 IEM stereo pocket receiver
Antenna
Red LED for operation and battery status indication (ON/LOW BAT)
Green LED for RF signal indication (RF)
Cover plate for battery compartment
Cover plate for display and operating controls
Headphone output (EARPHONES), 3.5 mm stereo jack socket
On/off/volume control
Balance control
SET button
LC display
button (DOWN)
button (UP)

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Inserting and changing the battery
씰Slide the cover of the battery compartment in the direction of the
embossed arrow until it clicks audibly.
씰Open the cover.
씰Insert the 9 V PP3 battery (IEC 6 LR 61). Please observe correct polarity
when inserting the battery.
씰Close the battery compartment.
씰To remove the battery, push the small red lever in the battery
compartment towards the bottom side of the receiver.
Note:
We recommend powering the receiver by a standard PP3 alkaline
battery. If powered by a rechargeable 9 V battery, the operating time
will be drastically reduced.
Connecting the antenna
씰Screw the antenna  onto the antenna socket (M3 connection).
Connecting the headphones
If you use the receiver as part of the monitoring system, connect the supplied
in-ear headphones to the 3.5 mm jack socket  on the receiver. If you use
the receiver for other applications, you can also connect any Sennheiser
stereo headphones.
씰Connect the headphones to the headphone output (EARPHONES)
via a 3.5 mm stereo jack plug.
Signal indication
The green LED at the top of the EK 300 IEM receiver indicates that an
RF signal is being received.
Battery status indication
The red LED provides information on the (remaining) battery capacity:
LED lit up:
The receiver is switched on and the battery capacity is sufficient.
LED flashing:
The battery is going flat! You should immediately replace the battery!
3.5 mm stereo jack plug
for headphone connection

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Switching the receiver on
Turn the volume control clockwise (the volume control has an integral
on/off switch – the receiver is switched off when the control is turned fully to
the left until it clicks).
Note:
The receiver has a switch-on delay of approx. 1.5 seconds to suppress
the switch-on surge and protect your ears.
Adjusting the volume
Use the volume control to adjust the volume to suit.
Volume up? – NO!
When people use headphones, they tend to choose a higher volume than
with loudspeakers. Listening at high volume levels for long periods can lead
to permanent hearing defects. Please protect your hearing, Sennheiser
headphones have an excellent sound quality even at low volumes.
Adjusting the balance
During stereo operation, the balance control serves to adjust the balance
between the left and right stereo signal.
During FOCUS operation, the balance control serves to adjust the relative
levels of the two separate channels in the mixed mono signal (for full
description of FOCUS operation see page 49).
Attachment of the receiver to clothing
The EK 300 IEM receiver is attached to e.g. the belt with the supplied clip
. This is reversable so that the receiver can also be attached with the antenna
pointing downwards, if required.