Lectrosonics Quadra User Manual
Digital IEM System
INSTRUCTION MANUAL
TM
Fill in for your records:
Serial Number:
Purchase Date:
Rio Rancho, NM, USA
www.lectrosonics.com
QUADRA
2
LECTROSONICS, INC.
Table of Contents
FCC Notice ............................................................................... 4
Industry Canada Notices ........................................................ 4
Safety Notes............................................................................. 4
System Overview..................................................................... 5
Digital IEM System
Receiver
Receiver Operation.................................................................. 6
Battery Insertion..................................................................... 6
Powering the Unit ON and OFF ............................................. 6
Control Panel/Knobs .............................................................. 6
Body Placement....................................................................... 7
LCD Boot Screens................................................................... 7
Selecting 2 Channel or 4 Channel Operation........................ 7
2 Channel Operation ............................................................... 8
4 Channel Operation ............................................................... 9
Split 1,2 Operation................................................................. 10
Split 3,4 Operation................................................................. 11
Single Channel Operation..................................................... 12
Additional Setup Options ..................................................... 13
Tune ..................................................................................... 13
Pan ....................................................................................... 13
Limiter .................................................................................. 14
Backlight .............................................................................. 14
Treble Shelf .......................................................................... 14
Lock Setup........................................................................... 14
Factory Defaults................................................................... 15
Using the Presets .................................................................. 15
Load..................................................................................... 15
Save ..................................................................................... 16
Clear .................................................................................... 16
None .................................................................................... 16
Replacement Parts ................................................................ 17
Transmitter
Transmitter Front Panel .....................................................18
Transmitter Rear Panel.......................................................18
Initial Setup ......................................................................... 19
Powering the Unit
ON and OFF .................................................................19
LCD ......................................................................................19
Audio Signal Monitoring ....................................................19
Transmitter Menus.............................................................. 20
Selecting 2 Channel
or 4 Channel Operation.....................................................20
Tuning ...............................................................................20
Input Type..........................................................................20
Audio Trim ......................................................................... 21
Lock Setup........................................................................21
Factory Default Reset .......................................................21
Rack Mount Hardware........................................................ 22
Dual Unit Rack-Mount Instructions...................................22
Single Unit Rack-Mount Instructions................................24
Replacement Parts ............................................................. 26
System
Firmware Updates ..............................................................27
Troubleshooting Guide ......................................................28
Service and Repair ............................................................. 29
Returning Units for Repair ................................................29
Specifications .....................................................................30
Warranty .............................................................. Back Cover
Rio Rancho, NM
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QUADRA
FCC Notice
NOTE: This equipment has been tested and found
to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against
harmful interference in a residential installation. The
equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful
interference to radio communications. However, there
is no guarantee that interference will not occur in a
particular installation. If this equipment does cause
harmful interference to radio or television reception,
which can be determined by turning the equipment
off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
• Reorient or relocate the receiving antenna
• Increase the separation between the equipment
and receiver
• Connect the equipment into an outlet on a circuit
different from that which the receiver is connected
• Consult the dealer or an experienced radio/TV
technician for help
Changes or modifications to this equipment not expressly approved by Lectrosonics, Inc. could void the
user’s authority to operate it.
Industry Canada Notices
Operation of this device is subject to the following two
conditions: (1) this device may not cause interference,
and (2) this device must accept interference, including
interference that may cause undesired operation of the
device.
This device has been designed to operate with the
antenna listed below, and having a maximum gain of 6
dB. Antennas not included in this list or having a gain
greater than 6 dB are strictly prohibited for use with
this device. The required antenna impedance is 50
ohms.
• Lectrosonics M4T Antenna; P/N AMJR-915
To reduce potential radio interference to other users,
the antenna type and its gain should be so chosen that
the equivalent isotropically radiated power (e.i.r.p.) is
not more than that permitted for successful communication.
Safety Notes
Excessive sound levels can cause permanent hearing
damage.
1. Always adjust the volume to the lowest level before
listening to unknown transmissions.
2. Use the lowest reasonable level consistent with
hearing safety.
3. Don’t use high sound levels in the earphone to
overcome high ambient sound levels. That is
absolutely foolish! Demand and use high isolation
earphones.
4. Don’t expose your ears to sound levels that cause
them to ring. If your ears do ring after exposure,
think of it as a warning bell telling you not to do
that again.
OSHA (Occupational Safety Health Administration)
guidelines on the maximum allowable time exposure to
sound pressure levels that will cause hearing damage
are as follows:
8 hours at 90 dB SPL
4 hours at 95 dB SPL
2 hours at 100 db SPL
1 hour at 105 dB SPL
30 mins at 110 dB SPL
15 mins at 115 dB SPL
NEVER expose your ears to 120 dB SPL or higher!
Damage will occur.
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LECTROSONICS, INC.
Digital IEM System
4 CHANNEL MODE
System Overview
The Quadra system provides an entirely new level
of audio and RF performance in a wireless monitor
system. The combination of analog or digital input
capability, ultra-low latency 24 bit, 48 kHz audio, digital
RF modulation and discrete four channel mixing capability make the Quadra a truly unique IEM product for
mission-critical, professional applications.
The system is designed for line level analog audio
signals and AES/EBU digital audio input signals.
48kHz/24-bit audio, ruler-flat 20Hz to 20kHz frequency
response, ultra-low distortion and high dynamic range
assure excellent audio quality. Housings and panels
are machined aluminum with electrostatic powder
coated and anodized finishes and laser etched marking for durability. An intuitive mixing interface and
comprehensive LCD on the belt pack receiver provide
performing artists and monitor engineers alike with a
comfortable and confident user experience.
M4 Transmitter
The half-rack transmitter can accept up to four inputs
from digital or analog sources. The inputs can be configured as follows:
The input connectors are full size balanced XLR types
for AES/EBU and balanced line level analog signals.
Input preamp circuits use a special balanced amplifier
with very high common mode rejection to minimize
hum and noise.
Either analog or AES/EBU digital input signals are
converted to an internal 24-bit digital format which is
then encoded, organized into packets, and passed to
an RF modulator using spread spectrum techniques
and error correction for robust reception. The modulated RF signal is filtered before and after amplification
to suppress out-of-band noise and spurious signals,
and a circulator/isolator guards against intermodulation
interference (IM).
The transmitter can be free-standing or rack-mounted
in single units (via an optional rack mounting kit) or in
a dual configuration using supplied hardware.
A USB port is provided for firmware updates.
• Four analog inputs using all four jacks
• Two digital inputs using jack 1 and two balanced
analog inputs using jacks 3 and 4
• Four digital inputs using jacks 1 and 2
M4 Receiver
The receiver employs advanced antenna switching
diversity reception, switching between the antennas
during packet headers in order to maintain a seamless
audio signal. A configurable four-channel mixer on the
top of the receiver housing allows the user to mix four
discrete audio channels according to the needs of the
performance. The headphone jack is fed from a highquality stereo amplifier with adequate power to drive
headphones or earbuds to sufficient levels for stage
performance or other environments with significant
background noise. A high-density, backlit LCD allows
the user to make setup changes via the available
menu options.
A USB port is provided for firmware updates.
Frequency Range
Using the license free 902 - 928 MHz ISM band, this
system is outside the normal broadcast frequencies
thus providing both technical and operational advantages over standard analog systems.
Freq 1
OR
Freq
Freq
1A
1B
Freq 2
OR
Freq
Freq
2A
2B
2 CHANNEL MODE
Freq
3A
Freq 3
OR
Freq
3B
Freq
4A
Freq 4
OR
Freq
4B
In four-channel mode, the system occupies 4 MHz and
is selectable between four available center frequencies: 907.776, 912.384, 916.992 and 923.904 MHz.
In two-channel mode, Quadra occupies 2 MHz and
is selectable between eight available center frequencies: 906.624, 908.928, 911.232, 913.536, 915.840,
918.144, 922.752 or 925.056 MHz.
Multi-Channel Capability
Quadra can be configured to provide either 2 or 4
audio channels. In the 2-channel mode, eight different
frequencies are available, each with two audio channels. In the 4-channel mode, four different frequencies
are available, each with four audio channels. Multiple
Quadra systems can be operated in the same location
to provide up to 16 total audio channels between all
units.
The performer can then use the on-board mixer to tailor the audio output to his or her tastes or the requirements of the performance at hand.
Rio Rancho, NM
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QUADRA
Receiver Operation
Battery Insertion
The receiver is powered by three AA batteries, either
alkaline, lithium, or rechargeable types. Do not use
“heavy duty” batteries from a drug store - they will not
last long in the M4 receiver.
Open the battery door by pressing on it while sliding it
downward. It should then flip open allowing full access
to the battery compartment. Carefully note the battery
orientation as indicated by the diagrams inside. The
outer two batteries are positive (+) facing in, while the
middle battery is positive (+) facing out.
After the Power Up Sequence is displayed briefly, the
Main Window appears and the M4R is ready for operation.
Note also that the BAT T LED should be lit.
Green indicates good power. Red indicates your
batteries are 2/3 depleted. Flashing red indicates
that you should replace your batteries as soon as
possible.
To turn the receiver off, press and hold the power button for three seconds. A countdown will be displayed
until the power is turned off.
Control Panel/Knobs
The four knobs on the top edge of the M4 receiver
(two are in a dual concentric arrangement and two are
separate) allow for a number of mixer configurations
by using the Chan. Setup in the LCD menu. The first
knob (the tall, skinny one) is usually set as a Master
Volume, while the other three can be set up differently
depending on the artist’s needs and preferences. See
Selecting 2 Channel or 4 Channel Operation below
for details.
Once the three batteries are in place, close the door
by swinging it shut then sliding it upwards while applying slight pressure. It should snap shut and line up with
the case.
Powering the Unit ON and OFF
Press the power button once to turn on the unit. Check
to see that the LCD displays the single screen Power
Up Sequence showing the company logo, model number and firmware revision.
Power Button
The headphone jack is a standard 1/8” stereo TRS (tip,
ring, sleeve) jack with standard headphone wiring (tip
is left, ring is right, sleeve is ground). The headphone
amp can deliver 200mW into a 32 Ohm load so it is
important to always start with the volume low before
plugging in your headphones or earbuds.
CAUTION: Hearing damage can result from
listening too loudly with this receiver!
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LECTROSONICS, INC.
Body Placement
Position the receiver on a belt, guitar strap, wardrobe,
etc. so that the antennas are oriented vertically and not
touching a metallic surface. Make sure the antennas
are on the outside of thick or metallic costuming so the
antenna whips will be out in the open. For maximum
receive sensitivity, it is good practice to keep the antenna whips from direct contact with a person’s body.
Digital IEM System
To access the setup menus, press the MENU/SEL
button at the upper left of the membrane panel. Press
the BACK button to back up one level or return to the
main window. The UP and DOWN arrow buttons along
the right side of the control panel allow you to navigate
between menu options and to adjust specific parameters within the setup screens.
Battery status is indicated by a GREEN LED. The
LED turns RED to indicate that your batteries are 2/3
depleted. FLASHING RED indicates that you should
replace your batteries as soon as possible.
LCD Boot Screens
The boot sequence will briefly display the company
logo, model number and firmware revision.
If a preset is active, this screen will appear, including
the word (modified) if the preset has been edited.
Following the boot-up sequence, the receiver will revert to the Main Window, showing the following:
Operating
Frequency
RF Level Meter
Audio
Level
Meters
The blue RF LED indicates an RF lock between the
transmitter and receiver, when lit.
Selecting 2 Channel
or 4 Channel Operation
The Chan. Setup screen allows you to select whether
the receiver operates in 2 channel, 4 channel or split 4
channel modes, and then how the knobs on the top of
the receiver are configured as a mixer.
Each Chan. Setup screen allows selection of 2 Channel and 4 Channel modes, plus a second line for selection of the knob configurations.
2/4 channel
selection
knob
configuration
Press MENU/SEL to toggle the highlight between the
Chans and Knob lines and use the UP and DOWN
arrow keys to make selections.
Operating Mode and
Knob Configuration
Rio Rancho, NM
NOTE: Review the individual setup options in the
following section.
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2 Channel Operation
In this mode, two channels are fed to the transmitter
and are available at the receiver.
Master(1,2) mode
AUDIO CH.
1
MASTER
VOLUME
2
NO
FUNCTION
NOTE: the transmitter must be also in 2 Channel
mode for the receiver to operate in this manner.
2-ch. mode allows for three different knob setups:
• Master(1,2)
This is the factory default and is equivalent to
standard IEM systems where only a stereo signal
is used. The tall, thin knob is the stereo master
volume.
• Master(1)+2
Feeds audio channel 1 to the master volume
(tall, thin knob) and audio channel 2 to the lower
concentric knob for independent control. You can
develop a stereo mix by panning each channel in
the stereo field (see panning, below).
• 1+2
Gives you individual control over both audio
channels. Audio channel 1 is fed to the tall thin
knob, and audio channel two is fed to the lower
concentric knob. In this setup, there is no master
volume knob.You can develop a stereo mix by
panning each channel in the stereo field (see panning, p. 10).
NO
FUNCTION
Master(1)+2 mode
MASTER
VOLUME
AUDIO
CH. 2
MASTER
VOLUME
AUDIO
CH. 1
NO
FUNCTION
8
1+2 mode
AUDIO
CH. 2
AUDIO
CH. 1
NO
FUNCTION
LECTROSONICS, INC.
4 Channel Operation
In this mode, all four audio channels fed to the transmitter are available at the receiver.
Master(1,2)+3,4 mode
AUDIO CH.
1
MASTER
VOLUME
2
Digital IEM System
AUDIO
CH. 3
AUDIO
CH. 4
NOTE: the transmitter must be in 4 Channel
mode for the receiver to work in this manner.
Audio can be routed to the four audio control knobs in
the following ways:
• Master(1,2)+3,4
Feeds channels 1 & 2 to the master volume knob
in a fixed stereo relationship, while audio channels 3 & 4 are on the two smaller separate knobs.
This gives you individual control over two of the
channels in their relationship to the stereo mix.
For instance, you may want to have drums and
bass (in stereo) on 1 & 2, your guitar in ch. 3 (first
small knob, in the middle) and your vocals in ch.
4 (second small knob, closest to the headphone
jack). After choosing this mode, you would use
the master knob to control your overall volume,
and the other two knobs to change how those two
individual channels are mixed into the master.
• Master(1)+2, 3, 4
Places ch. 1 on the master knob, and then gives
you individual control over channels 2, 3 and 4.
Use this mode if you plan to have a mono mix as a
starting point, and then add three additional channels that you would like to adjust during performance. An example would be drums and bass (in
mono) on 1, backing vocals on 2, your guitar on
3, and your vocals on 4. Each of the channels can
still be panned in the stereo field.
• 1+2+3+4
Gives you individual control over all four audio
channels. In this setup, there is no master vol-
ume knob. You can develop a stereo mix by panning each channel in the stereo field (see panning,
below).
NO
FUNCTION
Master(1)+2,3,4 mode
AUDIO
CH. 1
MASTER
VOLUME
AUDIO
CH. 2
AUDIO
CH. 3
AUDIO
CH. 4
1+2+3+4 mode
AUDIO
CH. 1
AUDIO
CH. 3
AUDIO
CH. 4
Rio Rancho, NM
AUDIO
CH. 2
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QUADRA
Split 1,2 Operation
Split modes allow you to use a single M4T transmitter
running in the 4 Channel mode to send two different
2 channel stereo mixes to two different receivers or
groups of receivers using a single radio frequency.
Split 1+2 mode delivers audio channels 1 and 2 to
the tall, thin knob and the lower concentric knob. The
knobs can be set up to function in three different ways.
NOTE: the transmitter must be in 4 Channel
mode for the receiver to work in this manner.
• Master(1,2)
Equivalent to standard IEM systems where only
stereo signal is used. The tall, thin knob is the stereo master volume and is fed from audio channels
1 & 2. Although there is audio on channels 3 & 4
in the transmission itself, they are muted and thus
the lower main knob and two individual knobs do
not function.
• Master(1)+2
Feeds audio channel 1 to the master volume (tall,
thin knob) and audio channel 2 to the lower concentric knob for independent control.
• 1+2
The two knobs function independently with neither
one working as a master. Feeds audio channel 1
to the tall, thin knob and audio channel 2 to the
lower concentric knob for independent control.
Master(1,2) mode
AUDIO CH.
1
MASTER
VOLUME
NO
FUNCTION
Master (1)+2 mode
AUDIO
CH. 1
MASTER
VOLUME
AUDIO
CH. 2
2
FUNCTION
NO
FUNCTION
NO
NO
FUNCTION
10
1+2 mode
AUDIO
CH. 2
AUDIO
CH. 1
NO
FUNCTION
LECTROSONICS, INC.
NO
FUNCTION
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