In-Ear Monitoring System
In-Ear Monitoring System
Item ref: 171.892UK
User Manual
Caution: Please read this manual carefully before operating
Damage caused by misuse is not covered by the warranty
Thank you for choosing this Chord IEM16 UHF in-ear monitoring system. This professional system provides
high quality wireless foldback for accurate audio reference with full freedom of movement. Please read this
manual before using this equipment in order to avoid damage through incorrect operation and to get the best
performance from your purchase.
Please take care when unpacking this product. Inspect for any damage and ensure you have the following
UHF wireless transmitter
Detachable BNC antenna
UHF bodypack receiver
Dual driver in-ear monitor headphones
19” rack-mounting kit
Mains power adapter
2 x AA batteries
To prevent the risk of fire or electric shock, do not expose any of the components to rain or moisture.
If liquids are spilled on any component, stop using immediately, allow unit to dry out and have checked by
qualified personnel before further use.
Avoid impact or heavy vibration to any of the components or over-stretching of the cables.
No user serviceable parts inside transmitter or receiver - refer servicing to qualified service personnel.
Ensure that the correct adapter is used with adequate current rating and that the mains voltage is as
stated on the adapter.
Avoid ingress of water or particles into the transmitter or receiver
Use alkaline or NiMH batteries in the bodypack receiver and remove if unused for long periods.
Observe the correct polarity when replacing batteries
Ensure good line-of-sight contact between transmitter and receiver for best reception
Keep all components out of direct sunlight and away from heat sources.
Do not place heavy objects on top of the receiver or transmitter
If rack-mounting, ensure adequate support and connection access for the transmitter unit.
Keep the transmitter and receiver away from damp or dusty environments.
Use a soft cloth with a neutral detergent to clean the body of the transmitter and/or receiver.
To avoid damage, do not use solvents to clean the components
Sterile wipes may be used on in-ear headphones – be sure to avoid ingress of fluids into the nozzles
171.892UK User Manual
Transmitter front panel
Power button
Up, Down, Set buttons
Input Level control
6.3mm stereo headphone jack
Headphone volume control
DC inlet
Left & Right XLR/jack inputs
Pad level switch
BNC antenna connection
Transmitter rear panel
Bodypack receiver
3.5mm stereo headphone jack output
Volume and on/off control
LED indicator
LCD display
Control and battery compartment
Bodypack controls
Press to exit current function
Press to increase parameter
Press to enter settings
Press to decrease parameter
Setting up
Connect the monitor mix signal from a mixing console to the transmitter unit via the left and right
XLR/jack inputs on the rear panel. The PAD switch (8) cuts the signal by -12dB for high level input.
Connect the supplied antenna to the rear BNC connection and extend fully. Connect the supplied DC
adaptor to the DC inlet on the transmitter unit and a mains socket, observing the correct voltage.
Flip open the front cover of the bodypack receiver and insert 2 x AA batteries (supplied), whilst
observing the correct polarity. Making sure the Volume/On/Off rotary control (11) on the bodypack is
turned off, connect the in-ear monitor headphones to the 3.5mm jack output (10).
171.892UK User Manual
Operation - Transmitter unit
The ½ rack transmitter unit has a large LCD window with 3 buttons alongside it. Press and hold the
Power button (1) on the left of the unit will power up the transmitter and the LCD display will be lit.
Any audio signal played into the transmitter unit will be indicated by L + R bar meters on the left of
the LCD display. The level of the input is governed by the INPUT LEVEL rotary control (3) and if
necessary, a PAD switch on the rear panel can apply a -12dB cut to high level input signals.
Pressing the “SET” button (2) enters the settings mode and repeated pressing of the SET button
steps through the different settings available on the transmitter.
Pressing the SET button once will cause the upper left character
named “GROUP” in the display to flash. The IEM16 has only 1 group
of frequencies, so this parameter will not need to be changed.
Pressing the SET button twice steps on to the CHANNEL setting and
using the UP/DOWN buttons (2) will change the channel that the
IEM16 is transmitting on to one of 16 available UHF frequencies.
Pressing the SET button 3 times steps over to the STEREO/MONO
setting, which can be toggled between mono or stereo output using
the UP/DOWN buttons. Mono is especially useful when using a single
earpiece instead of 2.
Pressing SET 4 times steps on to the power setting labeled “POW”.
The UP/DOWN buttons can select between H (high) or L (low) power
for the transmitter carrier signal. Normally, this is set to H (high)
unless the carrier signal is causing interference with other nearby
equipment, in which case, it may be better to set it to L (low).
Pressing the SET button 5 times will step through to the LOC mode.
Pressing the UP button selects “LOC on” and then pressing the SET
button will indicate “LOC on” and no other settings can be changed.
To unlock the panel, press the DOWN button to select “LOC off”
Whilst in lock mode, the POWER button will not function. When the lock function is off, pressing and
holding the POWER button will power down the transmitter unit.
The transmitter unit has a 6.3mm stereo output for wired headphones (4), which can be used in
addition to the UHF bodypack receiver(s). This output has its own dedicated output volume control
on the front panel (5). This output may also be used to check the quality of the monitor feed before
switching on any bodypack receivers.
171.892UK User Manual
Operation - Bodypack receiver
Switch on the bodypack receiver by turning the rotary Volume/On/Off rotary control clockwise and
the LCD display will be lit. Turning this control further increases the output level to the earphones.
Flipping open the front cover reveals 4 buttons above the battery
compartment for settings adjustment. Pressing the UP/DOWN buttons
) adjusts the left/right output balance to the earphones.
Pressing the SET button steps through the various settings outlined below.
Pressing the SET button once will cause the character named “GROUP” in the
display to flash. The IEM16 has only 1 group of frequencies, so this parameter
will not need to be changed.
Pressing the SET button twice steps on to the CHANNEL setting and using the
UP/DOWN buttons will change the channel that the bodypack is receiving on
to one of 16 available UHF frequencies. Select the same channel as the
transmitter and the LED indicator (13) will light to show that RF is detected.
Pressing the SET button 3 times will step through to the LOC mode.
Pressing the UP button selects “LOC on” and then the UP/DOWN buttons will
no longer change the left/right output balance to the earphones.
To unlock the balance controls, press the DOWN button to select “LOC off”
When receiving RF from the transmitter, the upper left corner of the LCD
display shows a signal strength meter. The number of bars shown indicates
how strong the RF carrier signal is. It is important to maintain good RF
reception to avoid drop-outs or interference.
Up to 4 IEM16 systems can be operated in the same area on different UHF frequencies. However,
there is no limit whatsoever on how many bodypack receivers can “listen” to any one transmitter so
long as they are within the transmission distance and set to the same channel.
A clip on the bodypack enables it to be attached to clothing during use. The bodypack should be
positioned where it is convenient to access and comfortable to wear.
To power down the bodypack receiver, turn the Volume/On/Off rotary control fully anticlockwise until
it clicks. This will switch off the power to the bodypack and preserve the batteries.
171.892UK User Manual
Carrier frequencies
Frequency stability
RF output power
S/N ratio
Frequency response (±3dB)
Max. range
Power supply: Transmitter
Settings: Transmitter
Controls: Transmitter
Dimensions: Transmitter
Connections: Transmitter
Weight: Transmitter
Power supply: Beltpack receiver
Controls: Beltpack receiver
Settings: Beltpack receiver
Connections: Beltpack receiver
Dimensions: Beltpack receiver
Weight: Beltpack receiver
863.1 - 864.9MHz (16 channels)
0.005% PLL
<0.4% @ 1kHz
40Hz - 16kHz
12-18Vdc, 300mA (adaptor included)
Group (1), channel, lock, power, mono/stereo
Power, set, up/down, input level, phones volume, pad
44 x 210 x 175mm
DC in, antenna (BNC), combo input L + R, phones out
3Vdc (2 x AA batteries supplied)
On / volume, esc, up/down, set
Balance, group (1), channel, lock
3.5mm stereo jack
110 x 65 x 25mm
98g (no battery)
“POWER” LED does not
light on transmitter
Bodypack is powered up
but no RF indication
RF signal is OK but no
sound from headphones
RF carrier signals are
"dropping out"
Headphone output is
very loud or distorted
Ensure power adapter is connected to mains and working properly
Ensure POWER button is switched on
Ensure that the transmitter is switched on
Check that the transmitter is not out of reception range
Check that the receiver is on the same channel as the transmitter
Check that the audio input into the transmitter is OK and connected properly
Check that the input level control on the transmitter is not turned fully down
Check that the bodypack volume control is not turned fully down
For wired headphones, check the dedicated headphones volume control
Avoid any physical barriers (e.g. walls) between transmitters and receiver
Adjust the angle of the antenna to try to achieve more stable reception
Make sure the transmitter power (POW) is set to high (H)
Try a different UHF channel
Turn down VOLUME on the bodypack receiver
For wired headphones, turn down the dedicated headphones volume control
Turn down the input level on the transmitter unit
Slide the PAD switch to -12dB for high level input signals
Disposal: The “Crossed Wheelie Bin” symbol on the product means that the product is classed as Electrical or
Electronic equipment and should not be disposed with other household or commercial waste at the end of its useful life.
The goods must be disposed of according to your local council guidelines.
Errors and omissions excepted.
Copyright© 2014. AVSL Group Ltd.
171.892UK User Manual
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