Page 1
User
Guide
Clear-Com Encore
®
PIC-4744, MA-704, AX-704
IFB System
Part Number: 399G165 Rev A
Date: 2/26/16
Page 2
Page 3
TABLE OF CONTENTS
IMPORTANT SAFETY INSTRUCTIONS ..................................................4
WARNING ...............................................................................4
THE PROGRAM INTERRUPT CONTROLLER (PIC) ........................................6
INTRODUCTION TO THE PIC-4744...........................................................6
The PIC-4744 Console .....................................................................8
The MA-704 and AX-704....................................................................9
The TR-50 ...............................................................................10
OPERATION .......................................................................11
INSTALLATION .....................................................................11
System Capacity ..........................................................................11
SYSTEM ARCHITECTURE ............................................................12
INTERCONNECT CABLING ...........................................................15
6 Pin XLR Connector.......................................................................15
SYSTEM CONNECTION ..............................................................16
PHYSICAL MOUNTING...............................................................17
SETUP AND SYSTEM CHECK .........................................................19
MAINTENANCE ..........................................................................19
TROUBLESHOOTING TIPS ...........................................................20
SPECIFICATIONS ...................................................................21
PIC-4744, AX-704 and MA-704 Technical Specications ...........................................21
GLOSSARY OF TERMS ..............................................................23
CLEAR-COM CONTACTS.............................................................24
EMC AND SAFETY ........................................................................25
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IMPORTANT SAFETY INSTRUCTIONS
Please read and follow these instructions before operating this product.
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including
ampliers) that produce heat.
9. Only use attachments/accessories specied by the manufacturer.
10. Use only with the cart, stand, tripod, bracket, or table specied by the manufacturer, or sold with the apparatus.
When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
11. Unplug this apparatus during lightning storms or when unused for long periods of time.
12. Refer all servicing to qualied service personnel. Servicing is required when the apparatus has been damaged
in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into
the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been
dropped.
WARNING
To reduce the risk of re or electric shock, do not expose this product to rain or moisture.
Please familiarize yourself with the safety symbols in Figure 1 (next page). When you see these symbols on this product,
they warn you of the potential danger of electric shock if the station is used improperly. They also refer you to important
operating and maintenance instructions in the manual.
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Page 5
This symbol alerts you to the presence of
uninsulated dangerous voltage within the
product's enclosure that might be of sufcient
magnitude to constitute a risk of electric shock.
Do not open the product's case.
This symbol informs you that important operating
and maintenance instructions are included in the
literature accompanying this product.
Figure 1: Safety Symbols
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Page 6
THE PROGRAM INTERRUPT CONTROLLER (PIC)
INTRODUCTION TO THE PIC-4744
During the production of a program for transmission or recording, a director or producer frequently needs to cue the
performing talent. This is done using Interruptible FoldBack (IFB), a type of simplex intercom for sending program and
interrupt (cue) audio on “IFB” lines for the talent to monitor. The IFB line is comprised of three elements: Program Audio,
Interrupt (Cue) Audio and the Dip or Mute control. See the signal ow diagrams, Figures 1-1a and 1-1b, pgs. 6-7.
Electronic control allows the director to interrupt the program signal when addressing the talent. These IFB
communications are “one-way” from an access location to the selected talent position or destination.
Clear-Com’s new stand-alone IFB components provide high performance, cost-effective answers for applications where
regular intercom functions are not also required, or where space constraints require compact, versatile packaging.
The simplest stand-alone system consists of a PIC-4744, an MA-704, Goose neck Mic (or hot mic from intercom) and a
PS-702 for power for the TR-50 talent receivers. This system will permit cuing of up to four talent positions from only one
access location. Using “Y” cords, more TR-50 units may be added.
Note: Throughout this manual, “access location” refers to the physical place needed for
someone to cue the talent. “Talent position” refers to the individual “talent” cue channels.
Figure 1-1a: Audio Control Paths
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Page 7
Figure 1-1b: Audio Control Paths
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www.clearcom.com
Program
Output
Level
1234
Program
Output
Level
1234
Program
Output
Level
1234
Headset Monitor Talent Select
Program
Output
Level
Monitor Out
1234
O
A
D
C
B
1
8 9 10 1211
5 6 7
432
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Dry
Wet
Dry
Wet
Dry
Wet
Dry
Wet
IFB
Atten
Atten
Test
Atten
Test
Atten
Test
Atten
Test
IFB
Atten
IFB
Atten
IFB
Atten
PIC-4744 IFB Router
Clear-Com Encore
The PIC-4744 Console
A Program Interrupt Controller (PIC-4744) unit is required for every four talent positions, or fraction thereof. For
example, a system with ve to eight talent positions will require two PIC-4744 units. The same IFB system with three
access locations will require three MA-704 units and three AX-704 units, but it will still require only two PIC-4744 units.
The PIC-4744 performs the program feed and interrupt functions for each talent position. It also adds a termination circuit
to the IFB lines.
Figure 1-2: PIC-4744 Controls and Connectors
Identical
controls for
all Talent
(A, B, C & D)
Identical
controls for
all Talent
(A, B, C & D)
Program Output Level adjustment
Program Select switch
Program Audio Attenuation control
Attenuation (Atten) Test button
Monitor output (Mini)
Monitor output (XLR)
Talent Select knob
Interrupt FoldBack (IFB) control
Power
11
Talent (A, B, C and D)
Wet/Dry Switch
12
Program 1, 2, 3 and 4
Adjusts the program audio level output for a specic Talent (A, B,
C or D)
Selects which of the program inputs (1 through 4) is connected to
the indicated Talent output (A, B, C or D)
Adjusts the program audio attenuation (Dip) when a specic Talent
(A, B, C or D) is selected via the MA-704 or AX-704. Turn counter-
clockwise to increase Dip and clockwise to decrease.
Allows observation of attenuation (PRG Dip) program level as
would be heard by the Talent
Monitor headphone output (4 Pin headset or 3.5mm jack)
Off: Headphone mute
A, B, C or D: Hear specic audio sent to one of four Talents outputs
Connection for MA-704 or AX-704 Talent access station. Includes
the audio from the microphone
Connection to PL power supply (both genders). Allows daisy
chaining to other intercom units
Outputs to talent receivers (typically TR-50s) or RF wireless IFBs
Wet: Provides phantom power to Talent beltpacks if needed (such
as the TR-50)
Dry: Allows connection for equipment that does not require
phantom power (such as Clear-Com’s PTX-3 Wireless IFB
Transmitter)
Inputs for program audio to be sent to Talent receivers (as selected
by item
)
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The MA-704 and AX-704
The AX-704
The MA-704
Clear-Com’s stand-alone series of IFB components offers two types of talent access station.
The MA-704 includes a goose neck microphone and a pre-amplier with line-level output, providing access to four talent
positions.
Each AX-704 allows access, from the same location, to an additional group of four talent positions. It requires an external
line-level signal for its interrupt (cue) audio source. The MA-704’s interrupt audio and ALL control signals will feed up to 24
AX-704 units. Only one MA-704 is required at each access location.
Each talent position may be accessed independently or simultaneously with any other(s). The ALL button on the MA-704
simultaneously accesses all talent positions of the MA-704 and each AX-704 extension unit fed from that MA-704.
All
Exten. Bus
IFB Extension
MA-704
External Line
Out
In
56 78
IFB Input
IFB Extension
Mic Gain
AX-704
Exten. Bus
Out
External Line
In
12 34
IFB Input
To PIC-4744 “B”To PIC-4744 “A”
Figure 1-3: MA-704 and AX-704 Units
The connectors on the MA-704, AX-704, and PIC-4744 are designed for simple interconnection as a stand-alone system.
However, all of the units’ electrical characteristics are the same as the integrated IFB systems on our standard broadcast
intercom line. With suitable connector adapters, both types of units can be connected in a system.
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Page 10
The TR-50
Volume
Headset
TR-50
Talent Receiver
The TR-50 Talent Receiver is a mini beltpack with a volume control, earphone jack, earphone and a clip for attachment to
a belt or under a desk. Talent receivers allow the talent to hear the program and cues via the IFB Electronics. The TR-50
contains an internal earphone amplier to increase the signal from the IFB System to the earphone.
The TR-50 connects to a Clear-Com IFB System via up to 2000 feet of good quality, standard mic cable. The extension
cable should have a female 3-pin XLR connector at the IFB controller and a male 3-pin XLR connector at the TR-50 end.
Figure 1-4: TR-50 Unit
TIP: How to take audio from the PL line and “dry it out” to send to a recording device:
Use the TR-50 as an interface between the wet analog intercom line by sending from the headset 3.5mm tip/sleeve/
ring jack to your recording jack. Use the volume control on the TR-50 to adjust the gain level to an appropriate level
for your device. This will dry out intercom voltage on pin 2 and any CALL SIGNAL voltage that is carried on the audio
circuit appearing on pin 3.
Earphone Jack
The earphone jack is a standard, stereo mini jack with no connection to the ring contact. This provides for use with monoaural earpiece, including Clear-Com’s CC010 or other 3.5mm connected earpiece.
NOTE: If stereo earphones are used, only one earphone will operate.
Volume Control
The Volume control adjusts the listen level of the incoming audio signal. The range is from full OFF (clockwise) to full ON
(counter-clockwise). Adjust the sound level using interrupt (cue) audio from an IFB access station such as an MA/AX-4
station. Do not use program audio for this adjustment. Mount the TR-50 if it will be used in a xed location.
NOTE: While the TR-50 is designed specically for the IFB System, this unit may be used as a “listen-only” beltpack with
any standard Clear-Com 2-wire network.
WARNING: Excessive sound pressure level from earphones or headphones can cause hearing loss.
XLR Connection
The XLR connection includes Common, Power and Audio pin-out and receives audio
from the Talent outputs on the PIC-4744.
10
30V
231
Common
Audio +
Figure 1-5: XLR 3-F Connection
Page 11
OPERATION
External Line
In
Exten. Bus
Out
IFB Input
IFB Extension
IFB Extension
IFB Inpu
AX-704
The MA-704 The AX-704
56 78
The system is operated by engaging the desired IFB buttons on the access stations. A control voltage on the IFB line
allows the PIC-4744 to dip the channel’s program feed, so that the cues from the director can be heard clearly.
1. Press the IFB button (1, 2, 3 or 4) on the access
station corresponding to the talent position(s) you wish
to cue, then speak into the MA-704’s microphone or
externally connected PL Hot Mic.
2. Press the MA-704’s All button to simultaneously
activate every IFB line, including those on any
accompanying AX-704 units.
When pressed, the buttons for IFB lines in use change from blue
to amber.
12 34
t
Mic Gain
All
Exten. Bus
Out
MA-704
External Line
In
INSTALLATION
Figure 1-6: MA-704
System Capacity
A system may have up to 50 access locations. Interrupt (cue) audio from the MA-704 can drive up to 23 AX-704 units,
thus permitting a maximum of 96 talent positions.
In order for the IFB system to be used at maximum capacity, two factors must be considered: system wiring
(architecture) and power requirements.
The MA-704 consumes a maximum of 180 mA (idle current 140 mA), and the AX-704 consumes a maximum of 150 mA
(idle current 120 mA). The resistance of the conductors in the interconnect cable is about 5 to 10 Ohms per 1000 feet. It’s
best to avoid having too many stations on one long cable run.
Unit Maximum mA Idle mA
MA-704 180 140
AX-704 150 120
For example: you have a system with two MA-704 units connected with a 2000 foot cable containing ~16 Ohms
cumulative resistance in the power conductor, another ~10 Ohms in the common conductor and a voltage drop with a
maximum of 9 volts.
If another two MA-704 units were to be added to this cable run, the voltage drop would be an unacceptable 18 volts.
Therefore, the other set of access stations would have to be connected on separate cable run from the PIC-4744.
Determining Power Supply Requirements
To determine the number and type of power supplies a system requires, add up the number of Unit Loads (1 Unit Load =
50 mA) while considering that the PS-702 power supply has a capacity of 24 unit loads.
Quantity Unit Unit Loads
1 PIC-4744 1
1 MA-704 4
1 AX-704 3
4 TR-50 1
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SYSTEM ARCHITECTURE
Two basic cabling methods for connecting the system may be used: “Daisy-chain (or loop-through)” and “Hub.” Both
methods may be combined in any system.
Since the PIC-4744 has only two IFB line connectors, a hub-type system is limited to two branches unless a splitter box
is used. Generally, resistance-buildup effects and resultant voltage drop are worse when using the Daisy-chain approach.
The Hub approach minimizes voltage-drop effects at the expense of greater cumulative cable capacitance. Cable
capacitance in this system isn’t quite the problem it is in a regular intercom system. This is because there is no sidetone
null change, only a degradation of high-frequency response.
Referring to the typical system block diagrams shown below, only the system in Figure 2-2 is connected using the “Hub”
method; all other systems are shown connected via the “Daisy-chain” method.
MA-704
Figure 2-1: One Access Location to up to Four Independent Talent Positions
PIC-4744
MA-704
PIC-4744
TR-50s
Figure 2-2: Two Access Locations to up to Four Independent Talent Positions
NOTE: A Clear-Com YC-66, 3-Way adapter may also be used
to connect the two MA-704s to the PIC-4744.
TR-50s
TRS Audio Cable
6-Pin Control Cable
3-Pin XLR Cable
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MA-704
MA-704
MA-704
PIC-4744
Figure 2-3: Three Access Locations to up to Four
Independent Talent Positions
TR-50s
AX-704MA-704
PIC-4744PIC-4744
TR-50s
Figure 2-4: One Access Location to up to Eight Independent Talent Positions
13
TR-50s
TRS Audio Cable
6-Pin Control Cable
3-Pin XLR Cable
Page 14
MA-704
AX-704
MA-704
PIC-4744
TR-50s TR-50s
Figure 2-5: Two Access Locations to up to Eight Independent Talent Positions
MA-704
PIC-4744
AX-704
AX-704
MA-704
MA-704
MA-704
PIC-4744
TR-50s TR-50s
Figure 2-6: Two Access Locations to up to Eight Independent Talent Positions
PIC-4744
AX-704
AX-704
AX-704
14
TRS Audio Cable
6-Pin Control Cable
3-Pin XLR Cable
Page 15
INTERCONNECT CABLING
Use one multi-pair cable for each group of four channels when connecting the IFB lines between the access stations
and their associated component (other MA-704 or AX-704 units and the PIC-4744). This cable must have four separately
shielded pairs of conductors to prevent crosstalk. Suitable cable types are: Alpha #6054, Belden #8725 or #9330 and
Mogami #2602.
As noted in the previous section, the resistance buildup in both the power and common (or ground) conductors must be
kept to a minimum for proper operation. Resistance buildup in the common conductor will also increase crosstalk. Follow
the diagram below for best results in connecting the cable to the XLR connectors.
Notice that all four of the spare conductors in each pair are tied together to Pin 2 (DC power), and all shields are tied
together to Pin 1 (common). This arrangement minimizes resistance buildup effects in long cable runs.
Clear-Com has ready-made cables in 25ft (# IC-25-6), 50ft (# IC-50-6), and 100ft (# IC-100-6) length to t the cabling and
system architecture needs.
6 Pin XLR Connector
ALL
SHIELDS
5
6
4
1
2
3
Figure 2-7: XLR6 Cable Wiring
In a system with more than four talent positions (one group), the interrupt (cue) audio from the MA-704’s mic preamp and
the ALL control signal must be bussed from each MA-704 to each AX-704 unit. A two-conductor shielded mic cable with
1/4-inch TRS phone plugs at each end is used for this purpose. Refer to Figure 2-8 for pin-out details.
Connect single channel talent receivers to the PIC-4744 using standard two-conductor mic cable. Only two conductors
are necessary for cabling between the power supply and any PIC-4744 unit. If any section of this cable is more than a few
feet long, be certain to use heavy-guage wire.
HELPFUL TIP: An RS-701 may be used as a monitoring station and communicate with
Talent if required. Pressing the TALK button will dip the program if the “Call-On” talk
function is enabled. Otherwise, you will need to press the CALL button to dip the program.
The Wet IFB line operates in the same manner as a standard Clear-Com PL line.
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SYSTEM CONNECTION
1. Determine the architecture for your IFB system.
2. Decide upon a location for the PIC-4744(s).
3. Connect the PIC-4744(s) to Clear-Com power supply(s) such as the PS-702 or PS-704.
4. Connect the program sources(s) to the PIC-4744(s) as required. A balanced program source is connected to
pins 2 and 3 of the program input. The common pin can be connected to the common or ground point of the
source, if necessary, to eliminate any residual hum. If a single-ended source is used, either pin 2 or 3 must be
connected to the common point of the source. The “high” side is connected to the other pin (2 or 3).
5. Use standard multi-pair shielded cables and two-conductor shielded mic cables to interconnect the access
stations as described in the preceding section.
6. Route all cables from the access locations and the talent receivers to the PIC-4744(s) using either or both of
the methods discussed in the previous section. Pin assignments for the rear panel IFB XLR connectors are:
Pin 1, Common; Pin 2, power; Pins 3–6, talent channels 1–4 respectively.
7. Route cables away from heavy AC power sources such as lighting panels, coiled cables carrying electricity or
electric motors.
8. In permanent installations, cables should be installed in accordance with approved local building codes.
Access Location #2
(Tech. Director)
MA-704
(Talent Positions 1, 2,3, 4)
IFB Input
IFB Extension
External Line
Exten. Bus
Mic Gain
In
Out
MA-704
(Talent Positions 1, 2, 3, 4)
IFB Input
IFB Extension
External Line
Exten. Bus
Mic Gain
In
Out
Phone Jack
Tip - Conductor A
Ring - Conductor B
Sleeve - Shield
IFB Input
AX-704
(Talent Positions
6 & 8)
IFB Input
External Line
Exten. Bus
IFB Extension
In
Out
AX-704
(Talent Positions 6 & 8)
External Line
Exten. Bus
IFB Extension
In
Out
3 Pin - 2 Wire
Pin 1 - Common
Pin 2 - Power
Pin 3 - N/C
65 W(MAX)
6 Pin - 6 Wire
Pin 1 - Common
Pin 2 - Power
Pin 3 - CH. A
Pin 4 - CH. B
Pin 5 - CH. C
Pin 6 - CH. D
PIC-4744 #2
(Talent Positions 5, 6, 7, 8)
www.clearcom.com
TR-50
Talent Position 8
TR-50
Talent Position 6
Program
PS-702 Power Supply
TERM
A
OFF
PS-702
INTERCOM CHANNEL A
ON
INTERCOM CHANNEL B
TERM
B
OFF
ON
Source
AUDIO
ADJUST
PROGRAM INPUT
PIC-4744 #1
(Talent Positions 1, 2, 3, 4)
www.clearcom.com
3 Pin - 3 Wire
Pin 1 - Common
Pin 2 - Power
Pin 3 - Audio
TR-50
Talent Position 4
TR-50
Talent Position 3
Figure 2-8: IFB Wiring Example
TR-50
Talent Position 1
Important: The TRS audio cable (displayed
in blue) connects the MA-704 “External Bus
Out” to the AX-704 “External Bus Out”.
16
TR-50
Talent Position 2
Program
Source
TRS Audio Cable
6-Pin Control Cable
3-Pin XLR Cable
Page 17
PHYSICAL MOUNTING
The PIC-4744 is designed for mounting in a standard 19-inch rack. It requires only one 1.75-inch rack space, and is
7.5-inches deep.
The MA-704 and AX-704 may be mounted in a console or desk, or in a standard 19-inch rack using the optional model
CEP-RK rack kit. Refer to the diagrams below for mounting dimensions when installing in a desk or console. There are
no special constraints on relative positioning of MA and AX units, though it is expected that the extension bus cable (the
one with phone plugs) will be no more than 10 feet (normally 18 inches long). Be sure to make allowance for the XLR
connectors to be plugged into the back of each access station.
19”
1.75”
Figure 2-9: CEP-RK Rackmount Kit Dimensions
Figure 2-10: MA-704 Mounting Dimensions
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Figure 2-11: AX-704 Mounting Dimensions
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SETUP AND SYSTEM CHECK
Program
Output
Level
1234
Headset Monitor Talent Select
Program
Output
Level
1234
5 6 7
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Atten
Test
Atten
Test
IFB
Atten
IFB
Atten
After program sources are connected to the appropriate XLR jacks on the back
panel, assign them at the PIC-4744 to the talent channels with the Program
(Source) select switches for each channel’s talent feeds (see Figure 1-2). Set the
Program Select witch to select source 1, 2, 3 or 4.
Set the attenuation (or dip) of the program feed during cuing with the attenuation
adjustment trims (see Figure 1-2). They can be set from no attenuation (fully CW)
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Program
Output
Level
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1234
Atten
Test
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IFB
Atten
to greater than 50 dB (fully CCW).
Before adjusting the Program Output Level, the volume at the Talent Receivers must be adjusted (via the control on the
Receiver) for a comfortable interrupt (cue) audio balance in the earpiece or headset while someone is cuing that talent
position from one of the access locations.
The Program Output Level controls permit use of program levels ranging from –20 dBu to +20 dBu. At full clockwise
rotation, the gain from program input to the IFB line is approximately unity. So at maximum gain setting, a program level
of –20 dBu will be roughly the same volume on the IFB line as the interrupt audio. If the program source level is around 0
dBu, the controls will have to be set near full counter-clockwise rotation to match the interrupt (cue) audio level on the IFB
lines.
The only adjustment possible at the MA-704 is a trim (± 5 dB) of the mic gain found on the back plane.
Adjusting this gain should be necessary only in unusual circumstances, because of the mic preamp’s limiter.
MAINTENANCE
The table of possible problems on the next page, which generally involves system wiring, covers only the most likely
problems. In any troubleshooting effort, keep these points in mind:
1. The power for all units in the system is routed from the power supplies through the PIC-4744.
2. All access stations (MA and AX units) and the talent receivers are connected across the IFB lines in a bridging
conguration (high impedance).
3. Each IFB line is terminated by its associated PIC-4744. The termination is about 220 Ohms AC, and
approximately 5,000 Ohms DC.
4. Three different types of signals are present on the IFB line:
a. Interrupt audio, which originates from an access station’s microphone.
b. Program audio, from the associated PIC-4744.
c. Interrupt control signal, a DC voltage which also originates at an access station.
5. The interrupt (cue) audio and all control signals for operation of the AX-704 stations at any given location are
supplied by the MA-704 station at that location.
6. Using a Wet output, a Clear-Com beltpack may be used for troubleshooting by pressing the CALL button,
causing the program audio to dip.
7. An RS-701 may be used as a monitoring station and communicate with Talent if required. Pressing the TALK
button will dip the program if the “Call-On” talk function is enabled. Otherwise, you will need to press the CALL
button to dip the program. The Wet IFB line operates in the same manner as a standard Clear-Com PL line.
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Page 20
TROUBLESHOOTING TIPS
SYMPTOM CAUSE SOLUTION
Channel access button not lit or too
dim.
Access button won’t light amber when
engaged at any station.
Access button remains lit in amber
after being released.
No cue from an AX-704 station. (a) Associated MA-704 not operating.
Hum or buzz from program (program
control affects loudness).
(a) No power.
(b) Insufcient power
(a) Excessive DC load on affected IFB
line.
(b) IFB line shorted in cabling.
IFB line not terminated. Insure that station connections to PIC-
(b) Faulty or missing connection to
MA-704 or AX-704 unit.
Mis-connection of program source to
output.
(a) Check that power supply is
operating and connected to the PIC4744
(b) Increase power capacity or connect
fewer stations on each cable run.
(a) Isolate and replace faulty module
on affected line.
(b) Isolate and repair cable.
4744 are intact.
(a) Insure that MA-704 is connected to
a PIC-4744.
(b) Verify connection of extension bus
to affected AX-704 unit.
Program inputs are balanced. If singleended source is used, one of inputs
must be referenced to common.
Interrupt is constantly engaged. Pin 2&3 of that module are shorted. Isolate and repair the faulty cabling.
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SPECIFICATIONS
PIC-4744, AX-704 and MA-704 Technical Specications
dBu is an absolute measurement. 0 dBu is referenced to 0.775 V RMS.
Panel Microphone Input (MA-704)
Input Type
Input Impedance
Mic Limiter Threshold
Mic Limiter Range
Output Phantom Power Voltage (unloaded)
Program Line Input
Maximum Level before Clipping
Input Impedance
Frequency Response
Panel Mic - Talent (MA-704 only)
Program Input - Talent
Extension Line - Talent
Max Distortion
Panel Mic - Talent (MA-704 only)
Program Input - Talent
Extension Line - Talent
Noise
Panel Mic - Talent (MA-704 only)
Program Input - Talent
Extension Line - Talent
Electret
>=2KΩ
0dB ± 3dB
>= 15dB
8.0 VDC
>= 20dBu
< 10KΩ
200 - 18KHz ± 3dB
200 - 18KHz ± 3dB
200 - 18KHz ± 3dB
<= 0.5%
<= 0.1%
<= 0.1%
< -65dBu
< -85dBu
< -85dBu
Max Gain
Panel Mic - Talent (MA-704 only)
Program Input - Talent
Extension Line - Talent
Min Gain
Panel Mic - Talent (MA-704 only)
Program Input - Talent
Power (PIC-4744)
Input Voltage Range
Input Current
Power (MA-704)
Input Voltage Range
Input Current (Idle)
Input Current (Max)
>= 30dB
>= -14dB
-14dB ± 3dB
<= 40dB
<= -45dB
20-30 VDC
< 40mA max
20-30 VDC
<= 140mA
<= 180mA
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Power (AX-704)
Input Voltage Range
Input Current (Idle)
Input Current (Max)
Rear Panel (PIC-4744)
20-30 VDC
<= 120mA
<= 150mA
IFB Input
Power In
Power Out
Talent Out
Program In
Wet/Dry Switch
Rear Panel Connectors and Controls (MA-704)
IFB Input
IFB Extension
Extension Bus Out
External Line In
Mic Gain
Front Panel Connectors, Controls & Indicators (PIC-4744)
Front Panel Connectors, Controls & Indicators (MA-704)
(2) XLR6F
(1) XLR3F
(1) XLR3M
(4) XLR3M
(4) XLR3F
(4)
(1) XLR6F
(1) XLR6M
(1) ¼” jack
(1) ¼ jack
(1) Gain adjust
(1) Power indicator LED
(4) Program Output Level controls
(4) Program Select input switches
(4) Attenuation (Atten) Test buttons
(4) Audio Attenuation (Atten) Adjust level controls
(2) Headset Monitor ports (3.5mm and XLR)
(1) Monitor select switch
(5) Talk buttons
(1) ¼” microphone jack socket
Front Panel Controls & Indicators (AX-704)
(4) Talk buttons
Environmental
32 - 122º F (0 - 50º C)
Dimensions (H x W x D)
PIC-4744 1.75 in. x 19 in. x 7.5 in.
MA-704 1.75 in. x 6.3 in. x 5.5 in.
AX-704 1.75 in. x 4.9 in. x 5.5 in.
Weight
PIC-4744 5.76 lbs. (2.62 kg)
MA-704 1.71 lbs. (.78kg)
AX-704 1.35 lbs. (.61 kg)
Notice About Specications
While Clear-Com makes every attempt to maintain the accuracy of the information contained in its product manuals, that information
is subject to change without notice. Performance specications included in this manual are design-center specications and are
included for customer guidance and to facilitate system installation. Actual operating performance may vary.
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GLOSSARY OF TERMS
TERM DESCRIPTION
3-Pin XLR Cable
6-Pin Control Cable
Attn Test
AX-704
IFB / Interrupted Fold Back
IFB Attn
MA-704
Program Output Level
A standard XLR mic cable.
A standard 6-Pin XLR connectors wired (see page 14).
The button that allows the attenuation (DIP) level to be monitored via headset, while
adjusting program audio attenuation (see IFB Attn).
A four button panel (connected to MA-704) that allows up to four additional Talent
positions to be added to the IFB system.
A method of using a single channel or cable to provide intermittent one-way
communication from the director to an on-air talent. The existing program audio signal is
dimmed.
Program audio attenuation (DIP) level adjustment. It controls the volume in Talent's
earpiece when director is communicating to talent.
The talent access station from which a Director addresses any one of the four Talents
(or all Talents) connected to PIC-4744.
Audio level output to a Talent’s earpiece.
Program Select
Talent
TRS Audio Cable
Wet/Dry Switch
A switch that assigns one of four programs to a Talent's earpiece.
The person wearing the earpiece through which one-way communication from the
director is heard.
An audio cable using Tip/Ring/Sleeve connectors (also known as 1/4" phono plugs).
The Wet position sends phantom power to Talent beltpacks. The Dry position is used if
the Talent equipment does not require a connection to a power source.
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Copyright © 2016 Clear-Com, LLC, an HM Electronics, Inc. company. All rights reserved.
Clear-Com, the Clear-Com logo and Clear-Com Concert are trademarks or registered trademarks of
HM Electronics, Inc.
The product described in this document is distributed under licenses restricting its use, copying, distribution, and decompilation/reverse engineering. No part of this document may be reproduced in any
form by any means without prior written authorization of Clear-Com, an HME Company.
Clear-Com Ofces are located in California, USA; Cambridge, UK; Montreal, Canada; and Beijing,
China. Addresses and contact information can be found on Clear-Com’s corporate website at www.
clearcom.com.
CLEAR-COM CONTACTS
Americas and Asia-Pacic Headquarters
California, United States
Tel: +1.510.337.6600
Email: CustomerServicesUS@clearcom.com
Europe, Middle East, and Africa Headquarters
Cambridge, United Kingdom
Tel: +44 1223 815000
Email: SalesSupportEMEA@clearcom.com
Canada Ofce
Quebec , Canada
Tel: +1 (450) 653-9669
China Ofce
Beijing Representative Ofce
Beijing, P.R.China
Tel: (008610)-8528-8748
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EMC AND SAFETY
The PIC-4744, MA-704 and AX-704 products meet all relevant CE and FCC specications set out below:
IEC/EN/CSA/UL 60950-1 : 2005; Information technology equipment – Safety – Part 1: General requirements
EN 55022:2010 Information technology equipment – Radio disturbance characteristics – Limits and methods of
measurement
EN 55024:2010 Information technology equipment – Immunity disturbance characteristics – Limits and methods of
measurement (C I S P R 24:2010)
Low Voltage Directive (LVD) 2014/35/EU
Electro-magnetic Compatibility (EMC) Directive 2014/30/EU
WASTE ELECTRICAL AND ELECTRONIC EQUIPMENT (WEEE)
The European Union (EU) WEEE Directive (2002/96/EC) places an obligation on producers (manufacturers, distributors
and/or retailers) to take-back electronic products at the end of their useful life. The WEEE Directive covers most Clear-
Com products being sold into the EU as of August 13, 2005. Manufacturers, distributors and retailers are obliged to
nance the costs of recovery from municipal collection points, reuse, and recycling of specied percentages per the
WEEE requirements.
Instructions for Disposal of WEEE by Users in the European Union
The symbol shown below is on the product or on its packaging which indicates that this product was put on the market
after August 13, 2005 and must not be disposed of with other waste. Instead, it is the user’s responsibility to dispose of
the user’s waste equipment by handing it over to a designated collection point for the recycling of WEEE. The separate
collection and recycling of waste equipment at the time of disposal will help to conserve natural resources and ensure that
it is recycled in a manner that protects human health and the environment. For more information about where you can
drop off your waste equipment for recycling, please contact your local authority, your household waste disposal service or
the seller from whom you purchased the product.
Clear-Com, LLC, an HM Electronics, Inc. company, is not responsible for equipment malfunctions due to erroneous
translation of its publications from their original English version. Illustrations in this publication are approximate
representations of the actual equipment, and may not be exactly as the equipment appears.
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