APB-DynaSonics ProDesk-4 User manual

ProDesk-4
OWNER’S MANUAL
APB-DynaSonics, Inc.
20 West End Road
Totowa, New Jersey, 07 12, U.S.A.
Tel: [phone]
Fax: [phone]
Web: www.apb-dynasonics.com

APB-DynaSonics
2

ProDesk-4 OWNER’S MANUAL
3
IMPORTANT SAFTEY INSTRUCTIONS
1) Read These Instructions
2) Keep These Instructions
3) Heed All Warnings
4) Follow All Instructions
) Do Not Use this Apparatus near water
6) WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus to rain or
moisture. Do not expose the apparatus to dripping or splashing. Do not place objects
containing liquids, such as vases, on the apparatus.
7) For safety the AC supply must include third wire protective ground connection.
8) Do not block any ventilation openings at the front and rear. Install in accordance with the
manufacturer’s instructions.
9) Do not install near any heat sources such as radiators, heat registers, stoves or other apparatus
(including amplifiers) that produce heat.
10) Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has
two blades with one wider than the other. a grounding type plug has two blades and a third
grounding prong. The wide blade or the third prong is provided for your safety. If the provided
plug does not fit your outlet consult an electrician for replacement of the obsolete outlet.
11) Protect the power cord from being walked on or pinched particularly at plugs convenience
receptacles and the point where they exit the apparatus.
12) Unplug this apparatus during lightning storms or when unused for long periods of time.
13) Refer all servicing to qualified 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.

TABLE OF CONTENTS
PSU INSTALLATION................................................................................................................................................................................................ 6
OPERATION WITH DUAL POWER SUPPLIES .............................................................................................................................................. 7
POWER SUPPLY PS450 - SPECIFICATION.................................................................................................................................................... 8
YOUR PRODESK-4 CONSOLE............................................................................................................................................................................. 9
BLOCK DIAGRAM L ) ...................................................................................................................................................................................10
BLOCK DIAGRAM R )...................................................................................................................................................................................11
MONO INPUT ....................................................................................................................................................................................................12
MONO INPUT - EQUALIZATION...............................................................................................................................................................13
MONO INPUT - AUXILIARY SENDS.........................................................................................................................................................14
MONO INPUT - MUTE, SOLO AND LEVEL CONTROL.......................................................................................................................15
MONO INPUT - BUS ASSIGNMENT AND PANNING .......................................................................................................................16
MONO INPUT - REAR PANEL CONNECTORS.....................................................................................................................................17
STEREO LINE INPUT........................................................................................................................................................................................18
STEREO LINE INPUT - STEREO EQUALIZATION................................................................................................................................19
STEREO LINE INPUT - AUX SENDS..........................................................................................................................................................20
STEREO LINE INPUT - MUTE, SOLO AND LEVEL CONTROL..........................................................................................................21
STEREO LINE INPUT - BUS ASSIGNMENT AND BALANCE...........................................................................................................22
STEREO LINE INPUT - REAR PANEL CONNECTORS ........................................................................................................................23
MASTER SECTION..................................................................................................................................................................................................24
AUXILIARY BUSES 1THRU 6) .......................................................................................................................................................................24
GROUP OUTPUT 1 THRU 4).........................................................................................................................................................................25
MATRIX OUTPUT 1 THRU 4) ........................................................................................................................................................................26
MAIN OUTPUT L-R-C-M).............................................................................................................................................................................27
REAR PANEL CONNECTIONS FOR ALL 18 MAJOR BUSES) ..................................................................................................................28
STEREO PROGRAM IN ...................................................................................................................................................................................29
STEREO RECORD OUT ALTERNATE OUT).................................................................................................................................................30
REAR PANEL CONNECTIONS FOR STEREO PROGRAM IN AND STEREO RECORD OUT.....................................................................31
USB AUDIO IN & OUT .........................................................................................................................................................................................31
MONITOR / HEADPHONE CONTROL.....................................................................................................................................................32
SOLO SYSTEM- MONITOR AND CONTROL...........................................................................................................................................33
TALKBACK SYSTEM ........................................................................................................................................................................................34
SOLO-LINKING AND MUTE-ALL ....................................................................................................................................................................35
MUTE-ALL CONFIGURATION ...............................................................................................................................................................................36
CONSOLE DIMENSIONS.........................................................................................................................................................................................37
TECHNICAL SPECIFICATIONS....................................................................................................................................................................38

ProDesk-4 OWNER’S MANUAL
5
POWER SUPPLY Model PS450
THE SYMBOLS BELOW APPEAR IN THE TEXT THAT FOLLOWS AND HAVE THE FOLLOWING
MEANINGS:
TO AVOID ELECTRIC SHOCK FOLLOW THE INSTRUCTION NEXT TO THIS SYMBOL.
TO AVOID AN UNSAFE CONDITION FOLLOW THE INSTRUCTION NEXT TO THIS SYMBOL
PSU- A
PSU- B
POWER ON-OFF SWITCH
AC INLET CONNECTOR
POWER GOOD INDICATOR
REAR VIEW OF CONSOLE

APB-DynaSonics
6
PSU INSTALLATION
This u it is for i stallatio i APB Dy aSo ics sou d mixi g co soles a d is i te ded for this purpose o ly. Complete
co soles are shipped with power supply(s) i stalled.
Whe addi g a seco d power supply to a existi g co sole or whe replaci g a existi g power supply follow these
i structio s:
1) Switch off AC power. Remove the AC power cord(s). Release the four screws holdi g the bla ki g cover plate, or
the existi g power supply u it. Remove the cover plate or existi g power supply u it. See the diagram for faste er
locatio s.
2) I sert the additio al/replaceme t power supply u it i to the ope i g a d push it firmly to seat the co ectio s.
Replace the four faste ers.
3) Use the power cord supplied to co ect a source of AC power betwee 100V a d 240V 50/60Hz.
4) The maximum power requireme t for the largest co sole is approximately 400VA.
5) It is a safety requireme t that the AC supply co ectio i cludes third wire protective grou d co ectio .
6) Safe operatio of the system requires flow of cooli g air from the surrou di gs. Air i take is at the lower
fro t of the co sole. Air exhaust is at the upper rear of the co sole. These ope i gs must ot be covered while the
system is o . Low- oise, i ter al fa s provide air moveme t.
OPERATION
Tur o each power supply usi g the rocker switch o the PS pa el.
Normal operatio is sig aled by illumi atio of the four gree DC voltage
i dicators at the top ce ter of the co sole a d by the illumi atio of the
adjace t blue “PSU GOOD” i dicator(s) a d also the gree “PSU GOOD”
i dicator o each PS u it pa el(s). The PSU Good co ditio is reached approx.
4 seco ds after i itial tur -o . This delay gives the Co sole’s i ter al circuits
time to stabilize a d the PSU Good sig al is the used to u -mute the mai
outputs of the Co sole.
NOTE: PS450 u its will o ly operate whe electrically co ected to the co sole circuits. Whe removed from the
co sole chassis a d whe power is switched o , se si g circuits i the PS u it comma d a shutdow of the system.
I this co ditio the PS GOOD i dicator o the PS pa el will ot illumi ate a d there will be o DC outputs. If this
occurs switch off, replace the u it i the co sole a d wait 30 seco ds before switchi g o .
Normal operatio of the PS 450 requires u restricted airflow through the u it for cooli g. Fa s operate at
all times a d circulate air withi the chassis. Ambie t air reaches the PS via ope i gs at the fro t of the
co sole. E sure that the i take a d exhaust ope i gs are ot obstructed.
AC POWER ON OFF

OPERATION WITH DUAL POWER SUPPLIES
A single PS450 power unit is conservatively rated to operate the 48 channel ProDesk console continuously. For
the assurance of fully redundant auto atic back-up operation, the console chassis (24 chan and above)
accepts a second PS450 unit. When a second PS is present and powered, both power supplies operate and the
load is shared. Two independently protected sources of AC power are reco ended for axi u protection
against loss of power.
1) Connect each power supply unit to AC power using the cable included.
2) The power supplies ust both be switched on using the panel rocker switch on both units.
a. Nor al operation is acco panied by the green illu ination of the indicators on both units. In addition two
blue PS status indicators are located within view on the console light-bar.
b. If for any reason a supply goes into shutdown then console operation continues using the other unit, the
changeover is auto atic and sea less. This event would be signaled by loss of a blue PSU status indicator.
REPLACEMENT OF POWER SUPPLY UNITS
1) Disconnect the AC power cord.
2) Re ove four screws that secure the PS unit in the console chassis arked with the sy bol
in the diagra . Pull on the power supply handle and the co plete unit will slide out of the console
chassis.
3) Slide the replace ent unit into the console. Replace the four fixing screws.
4) Reconnect the AC power cord.
5) Switch on the power supply using the rocker switch on the panel.
6) Green illu ination of the power supply panel indicator(s) and illu ination of blue “PSU GOOD” indicators
on the upper console control surface signal nor al operation.
7) Note that the power supply units will not operate outside of the console. Auto atic circuits prevent
operation if the unit is switched on while out of the console.
SERVICING
CAUTION RISK OF ELECTRIC SHOCK. DO NOT OPEN THE POWER SUPPLY.
There are no user serviceable parts inside the PS unit enclosure.
Units contain hazardous AC and DC voltages.
Return defect ve un ts to APB-DynaSon cs or author zed agent for serv c ng.
The unit will not operate outside a console. Auto atic circuits prevent operation when disconnected fro the
console. If this occurs: switch off, replace the unit in the console and wait 30 seconds before switching back on.

APB-DynaSonics
8
POWER SUPPLY PS450 - SPECIFICATION
 High efficiency switch- ode power supply
 Zinc-plated steel enclosure with ventilation by internal fans
 PS units plug into the APB ProDesk sound console chassis.
 IEC 60320 C13 AC inlet connection
 Universal AC input voltage and frequency 100-240V 50/60Hz
 Power Factor corrected AC input
Mult ple regulated DC outputs:
+/- 18V DC @ 10A audio syste
+15V DC @ 4.5A fans, lights, control syste
+48V DC @ 0.5A input phanto power
Mult ple protect on systems:
 AC input pri ary fuse, PCB ounted wire ended 20x5 T8A
 AC input in-rush li iting by relay and ther istor
 AC input overvoltage MOV cla p
 AC input dual series RFI chokes
 DC output short circuit protection
 DC output overvoltage protection
 Auto atic safety interlock prevents operation outside the console
 Auto atic shut-down in the event of elevated & unsafe internal te perature
Approvals:
 USA Recognized power supply with ETL arking and listing
 USA and Canada UL60065 7th Edition Electrical Safety
 Europe EN60065 7th Edition Electrical Safety
 Europe EN55103-1 E issions (Pending)
 USA FCC Part 15 E issions (Pending)
Pr nc pal Of Operat on
Power is drawn fro the AC line and rectified. A switching device aintains the voltage on the internal DC
reservoir capacitor within a controlled range. The ain transfor er operates at approxi ately 100kHz and
steps down the pri ary power fro about 400VDC to the low voltages required for the four regulated
outputs. The high frequency low voltage AC is rectified to generate the DC output voltages required. The +/-
18V DC supplies for the audio syste are coupled so that the voltage of the negative supply is a precise
irror of the positive voltage. The 48V DC supply is further processed using a three-ter inal regulator to
i prove noise and regulation qualities. All DC outputs are short-circuit protected, the +/-18V supplies are
controlled as a pair.

ProDesk-4 OWNER’S MANUAL
9
YOUR PRODESK-4 CONSOLE
Congratulations on your purchase of one of the finest live perfor ance professional audio consoles anufactured in the
United States.
Please take a o ent to review this anual. It will insure a better understanding of the operation of this console and
ay open up new possibilities into how you use this product.
In addition to the hard copy of this anual, it will appear within our web site www.apb-dynasonics.co with the latest
updates as well as new supple ental infor ation. We suggest that you occasionally check our web site for additional
infor ation about your console as well as for new product releases and news fro APB-DynaSonics.
Should you have any questions or co ents about this APB-DynaSonics product, please do not hesitate to contact us at:
Tel: [phone]
Fax: [phone]
e- ail: [email protected]
Manual Scope
This anual is not intended to teach you how to ix or how to set up a co plete sound syste . Should you
be looking for such infor ation, May we suggest that you do a Web Search for “Pro Audio Books” on the
Internet, or attend one of the any fine Recording Schools that ay be available to you. Many of these schools
offer courses in Live Perfor ance associated subjects as well as basic ixing techniques.
One of the BEST (and our favorite) sources of teaching the technical aspect of syste design and operation is
through the Syn-Aud-Con organization:
Synergetic Audio Concepts, Inc.,
8780 Rufing Road
Greenville, IN, 47124 – USA
800-796-2831
Fax : [phone]
For calls outside of the US: 812.923.0174
E ail: [email protected]
www.synaudcon.co

LRL R
Solo Linking
In Out
Stereo Record OutStereo Pgm Input Monitor Out
LRSum Mono
USB
Stereo Record Out
Mute All
USB
Stereo Pgm In
• Analog •
Primary Outputs
+4dBu
Bal
-10dBV
+4dBu
Bal
Master Metering
Meter Electronics
Solo Audio
& Control
Left Right Center M/A6
Mute-All
Command Audio Feeds from Main Faders
User Selection of Meter Response:
Average • Peak • Ave+Peak
Left RightDC
Main Output Levels
LR C
LR
Solo
Status
Mono/A6
Fader
9
6
0
6
9
12
15
18
24
30
36
12
3
3
18
15
Mode
9
6
0
6
9
12
15
18
24
30
36
12
3
3
18
15
L-RCenterMono Grp
1-2 Grp 3-4
Stereo
Line In
+4dBu
R
L
Right
Left
(Mono)
Gain Left
-20 to +20 dB
ProDesk-4 Stereo Inputs
ProDesk-4 Block Diagram Rev 0.92 16-July-09
Stereo
Line In
-10dBV
4 Stereo Inputs (A-B-C-D)
Located In Master Section
+6
+6
Line In
Source
TRS
RCA
(USB) Gain Right
-20 to +20 dB
Split
Track
Four Band EQ
Level
Hi Freq
10kHz
Level
Hi Mid
3kHz
Level
Lo Mid
300Hz
Level
Lo Freq
60Hz
Four Band EQ
Hi Freq
10kHz Hi Mid 3kHz Lo Mid 300Hz Lo Freq Pre
Fader
Blend
Pre
Aux
Blend
Aux
Chan
EQ On
Solo DC
Balance
Pot
Mute
3-4
Pre 3
Pk
8
Sig
Pk
8
Sig
Post-Fader
Buffer
Chan
LED
Meter
Assignment and Buffer
Circuitry
PFL
4
1
2
Aux Sends
Aux Bus 3
FET
Mute
Left Bus
Right Bus
Center Bus
Mono Bus
1-2
Pre 1-2
Stereo
Aux Bus 4
Aux Bus 1
Aux Bus 2
Solo Left
Remote
Mute
Mute Logic
Pre-Aux
Buffers
Solo Right
L
R
L
R
Aux
Pre-Source
Select
Rear Connector Panel
3-4 Always
Summed Mono
Group 1
Feed Matrix
Ext Line In
Left
Feed
Right
Feed
Center
Feed
Mono
Feed
Matrix
Sum Amp Matrix Insert
-2dBu
Matrix Out
+4dBu
Matrix
Level
Post-Fader
Matrix - Monitoring Feeds
Pre-Fader
From Previous
Matrix Line In
To Next
Matrix Line In
Matrix Outputs
1 of 4 shown
Matrix 1 to 4
Tip
Ring
Mute 1
Mute 2
Mute 3
Mute 4
Mute Commands
to Channels
Mute Group
Masters
R
L
Right
Left
-12dB
Stereo
Record
Level Mute
Stereo
Record
Out
Right
Left
Pre
Signal Sources
Post-Fader
Signal Sources
Pre-Fader
Monitor
Level
Aux 1-2
Solo Off
Monitor
Out
Sum
Solo
Mix Amps
R
Solo DC
Solo
(Audio)
Trim
Trim Range
-12dB 0 +12dB
Solo to Meters
Ctrl Audio
Headphone
Level
Solo Off
Headphone
Jack (Top)
1/8”
Headphone
Jacks (Front)
1/4” and 1/8”
Monitor Source Select & Mode Select
Center Mono Aux
1-2
APB-DynaSonics
TB Mic
(Front)
OSC
1 kHz
Oscillator
TB / Osc
Level
TB / Osc
On
Tap
Latch
Logic
TB Assign
Aux 1-2
Aux 5-6
Grps
Power Supply & DC Status LEDs
+18V –18V +15V +48V
PSU GoodAB
Lamp
Intensity 4-Pin XLR for Right-Angle 12V Lamps
2 to 4 sockets fitted depending on Console size
Any style lamp can be used: Low-current LED to Hi-current Halogen
Power Distibution and Sharing
PSU A PSU B
ProDesk-4
DynaSonics
Block Diagram
PSU A
Power Distibution
To Modules
Chassis Ventilation & Cooling
+18V@10A
-18V @ 10A
+15V @ 5A
+48V @ 0.6A
Model: PS-450
Plug-In Power Supply
The ProDesk-4 normally ships with 1 supply,
an optional power supply can be fitted in all chassis sizes except for the 16-channel.
With 2 PSUs fitted, the total Console load is shared equally between the 2 supplies.
The supplies are easily removed for service or replacement (4 screws) and can be hot-swapped.
AC Inlet
15A IEC
L-R
+18V
Phant
Power Supply
APB-DynaSonics
Console Power Supply
Model PS-450
AC IN
100-240V
50 / 60 Hz
500W
PSU
Good
Power
ProDesk Rear Panel
3097042
Conforms to
ANSI/UL Std. 60065
Cert. To CAN/CSA
Std. C22.2 No. 60065
USC
ETL Classified
CAUTION
AVIS :RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR
RISK OF ELECTRIC SHOCK
DO NOT OPEN
PSU B
AC Inlet
15A IEC
APB-DynaSonics
Console Power Supply
Model PS-450
AC IN
100-240V
50 / 60 Hz
500W
PSU
Good
Power
3097042
Conforms to
ANSI/UL Std. 60065
Cert. To CAN/CSA
Std. C22.2 No. 60065
USC
ETL Classified
CAUTION
AVIS :RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR
RISK OF ELECTRIC SHOCK
DO NOT OPEN
+18V@10A
-18V @ 10A
+15V @ 5A
+48V @ 0.6A
ProDesk-4 Block Diagram ProDesk-4 Block Diagram
ProDesk Rear Panel
Group 2
Feed
Group 3
Feed
Group 4
Feed
External In
Peak
Sig
Group
Mix Amp
Group Insert
-2dBu
Group Out
+4dBu
Solo Left Tip
Ring
Solo Right
Peak
Sig
100mm
Group
Fader
Group Mix Bus
Group To
L-R
Left Bus
Right Bus
Group To
Center
Center Bus
Group To
Mono
Mono Bus
Group Bus
Assignments
Group Outputs
1 of 4 shown
Solo DC
10dB
Fader
Amp
Bus In
+4dBu
Solo Left
Solo Right
Solo DC
AFL
10dB
Power-OK
Command
OutSmarts
Balanced Driver
Mute-All
Command
Power-OK
Command
OutSmarts
Balanced Driver
Mute-All
Command
Aux
Mix Amp
Aux Insert
-2dBu
Aux Out
+4dBu
Solo Left Tip
Ring
Solo Right
Peak
Sig
Aux
Level
Aux Mix Bus
Aux Outputs
1 of 6 shown
Solo DC
Bus In
+4dBu
AFL on Aux 1 & 2
are Stereo-linked 10dB
Fader
Amp
Power-OK
Command
OutSmarts
Balanced Driver
Mute-All
Command
Use MODE switch to select desired meter response:
When MODE switch is pressed,
STATUS LED will illuminate and show current mode:
Amber= Average + Peak
Green= Average Only
Red= Peak Only
Status LED will remain illuminated for a few seconds-
Pressing MODE switch when LED is illuminated will step to next mode,
LED will change color.
If MODE switch is not re-pressed when LED is still illuminated,
meter status remains in its current mode.
STATUS LED- Additional Function:
If Mute-All is activated (via Phoenix connector on rear panel),
STATUS LED will blink RED approx twice per second.
The 4 meter arrays will be turned off and all XLR outputs will be muted.
Pan
to L-R
Mtx Pre
Matrix Feed
Group Output
Meter
(VU-Response)
100mm
Stereo
Fader
5-6
Pre 5
6
Aux Bus 5
Aux Bus 6
Grp3 Bus
Grp4 Bus
Grp1 Bus
Grp2 Bus
- 6
- 6
Bal
XLR In
Preamp / EQ
Sub-Board
Gain
15 - 65 dB
Four Band EQ
Level
Hi Freq
HPF
Pad
Solo DC
Direct
Out
+4dBu
Pan
Pot
1-2
Pre 1
Insert
+4dBu
+48V EQ On
Pk
8
0
6
12
Sig
Fader Amp
Pre
Fader
Solo Left
Hi-Pass
-12dB/Oct
20Hz - 400Hz Chan
LED
Meter
Bus Assignment
and
Pan Circuitry
2
3
4
5
6
Aux Sends
Direct Out
– User Options –
Post
Insert
Polarity
100mm
Channel
Fader Aux Bus 1
FET
Mute
Line In
Line
In
Pre
Amp Pre Fader
Rear
Connector
Panel Level
Lo Freq
Level
Hi Mid
400 - 8kHz
Freq LevelFreq
Lo Mid
80 - 2kHz L-RCenterMono
Left Bus
Right Bus
Center Bus
Mono Bus
From
Mic Pre
1-2
Stereo
Aux Pre
Pre-Fdr
Pre-EQ
Aux Bus 2
Aux Bus 3
Aux Bus 4
Aux Bus 5
Aux Bus 6
Solo Right
To
Aux
Mutes
From
Mute Logic
Aux “Pre”
Buffer
Pre-EQ
– User Options –
Post
HPF
Post
Insert
To
Direct Out
Options
3-4
Pre
5-6
Pre
ProDesk-4 Mono Inputs
Channels 1-48
Tip
Ring
Tip
Ring
Grp
1-2 Grp 3-4
Group-1 Bus
Group-2 Bus
Group-3 Bus
Group-4 Bus
Dir Out
Buffer
Post
Fader
From
Fader Amp
10dB
Default
Setting
Default
Setting
10kHz
Shelf 60Hz Shelf
FET
Mute
HPF
On
5-6 Always
Summed Mono
Aux
Mute
FETs
Scene Mute Select
3
4
1
2
Remote
Mute
Scene Mute Select
3
4
1
2
Mute Logic
From
Scene
Mute
Switches
For Stereo Inputs A-B-C
Alt Input is
Rear-Panel RCA jacks
“Pinkish”
Noise
Noise
Ref
Signal
TB
Mic
60Hz
Output
Un-Mute
Relay
Main
Mix Amp Main Insert
-2dBu
Main Out
+4dBu
Tip
Ring
Peak
Sig
100mm
Main
Fader
Main Mix Bus
Main Outputs
1 of 4 shown
10dB
Fader
Amp
Bus In
+4dBu
Mute
Power-OK
Command
OutSmarts
Balanced Driver
Mute-All
Command
Matrix
Pre
Matrix Feed
Left, Right, Center, Mono
Output
Un-Mute
Relay
Output
Un-Mute
Relay
Output
Un-Mute
Relay
DC-Status & Power-OK Commands
For L&R Outputs:
Single, Stereo Fader used
Single, Matrix-Pre switch
used for all 4 Main outputs
Pre-Fader
Mains - Monitoring Feeds
Post-Fader
Post-Fader
Aux - Monitoring Feeds
Pre-Fader
Interconnection
Between Modules
Interconnection
Between Modules
USB In/Out
Stereo-Audio Codec
(Rear) Stereo
Program In Stereo
Record/Alt Out Monitor Out Left, Right, Sum-Mono
Mute-All
Command
Mtx
1-2
L
Sum
Mono
Mtx 1-2
Mono
Center
Right
Left
Aux 1-2
Mtx 1-2
Mono
Center
Right
Left
Solo Mix
R
Solo Mix
L
Pre
Signal Sources
Post-Fader
Signal Sources
Pre-Fader
Sum
Mono
Aux 1-2
Mtx 1-2
Mono
Center
Right
Left
Mtx 3-4
Aux 1-2
Mtx 1-2
Mono
Center
Right
Left
Mtx 3-4
Center Mono Aux
1-2
L-R Mtx
1-2
Source Select & Mode Select
Solo Left
Solo Right
Solo DC
PFL
USB
Master Interface Panel
Top
Analog
Rear
Analog
Rear
USB
Stereo
Program
Level
HF
Level
Hi Freq
10kHz
LF
Level
Lo Freq
60Hz
Stereo EQ
Mute
Peak
Sig
Peak
Sig
Left - Right
(Rear) Stereo
Program In
USB Stereo
Audio In
Solo Left
Solo Right
Solo DC
AFL
Feed to
USB Out
Center Mono Aux
1-2
L-R Mtx
1-2 Mtx
3-4
Bus Assign
Left Bus
Right Bus
Center Bus
Mono Bus
Matrix-3 Bus
Matrix-4 Bus
Aux-1 Bus
Aux-2 Bus
∑
Top-Panel
Mounted
Mini-jack
∑
∑
∑
∑
∑
Driver &
Protection
Circuits
9
6
3
0
3
6
12
24
Console Power Status and Illumination
Located on Front and Rear of Console Top Rail
Stereo Program In
Stereo Record/Alt Out
Monitor & HP Control
Stereo Program
Input Source Select
(Summed)
Aux 3-4
L-R
M
Mtrx
C
Talkback & Oscillator
Located on Rear of Console
Fader-Flip Available on Mono Bus:
Swap Controls & Indicators with Aux 6
See Aux Block Diagram (above) for details
2-Pin Phoenix
Main Metering
The meters are capable of displaying 3 different types of ballistic response:
Average (VU-style), Peak (PPM-style), or a combination of both.
Average Response is displayed as a slow bargraph
Peak response is dispayed as a fast bargraph
When both are active, Peak shows as a single LED above a bargraph
Solo Audio & Control
For Stereo Input D
Alt Input from USB Audio In
+6
+6
To Stereo Input D
Alt-Input
Fader-Flip Available
on Aux 6:
Swap Controls &
Indicators
with Mono bus.
Mute
AFL Level
Peak
Sig
Mute
Peak
Sig
Level
Fader-Flip Switch
(Located above Mono Fader)
Aux 6
Mono Aux 6
Mono
Matrix-1 Bus
Matrix-2 Bus
(Optional)
L
R
Default
Setting
Mute
Mute
AFL
Mute
AFL
Mute
PFL
10dB
∑
RCA
Jacks Female XLR Male XLR 1/4” TRS 1/8” TRS Rotary Control 100mm Fader Small Switch Illuminated Switch Indicator LED Internal User Options FET Switch GP • Summing • X-Gain Amplifiers
10dB
10dB
Rectifier • Peak Det
Metering
Block Diagram Legends
To Peak
Circuit
26dB
Pad
26dB
Pad
Matrix
Mix

LRL R
Solo Linking
In Out
Stereo Record OutStereo Pgm Input Monitor Out
LRSum Mono
USB
Stereo Record Out
Mute All
USB
Stereo Pgm In
• Analog •
Primary Outputs
+4dBu
Bal
-10dBV
+4dBu
Bal
Master Metering
Meter Electronics
Solo Audio
& Control
Left Right Center M/A6
Mute-All
Command Audio Feeds from Main Faders
User Selection of Meter Response:
Average • Peak • Ave+Peak
Left RightDC
Main Output Levels
LR C
LR
Solo
Status
Mono/A6
Fader
9
6
0
6
9
12
15
18
24
30
36
12
3
3
18
15
Mode
9
6
0
6
9
12
15
18
24
30
36
12
3
3
18
15
L-RCenterMono Grp
1-2 Grp 3-4
Stereo
Line In
+4dBu
R
L
Right
Left
(Mono)
Gain Left
-20 to +20 dB
ProDesk-4 Stereo Inputs
ProDesk-4 Block Diagram Rev 0.92 16-July-09
Stereo
Line In
-10dBV
4 Stereo Inputs (A-B-C-D)
Located In Master Section
+6
+6
Line In
Source
TRS
RCA
(USB) Gain Right
-20 to +20 dB
Split
Track
Four Band EQ
Level
Hi Freq
10kHz
Level
Hi Mid
3kHz
Level
Lo Mid
300Hz
Level
Lo Freq
60Hz
Four Band EQ
Hi Freq
10kHz Hi Mid 3kHz Lo Mid 300Hz Lo Freq Pre
Fader
Blend
Pre
Aux
Blend
Aux
Chan
EQ On
Solo DC
Balance
Pot
Mute
3-4
Pre 3
Pk
8
Sig
Pk
8
Sig
Post-Fader
Buffer
Chan
LED
Meter
Assignment and Buffer
Circuitry
PFL
4
1
2
Aux Sends
Aux Bus 3
FET
Mute
Left Bus
Right Bus
Center Bus
Mono Bus
1-2
Pre 1-2
Stereo
Aux Bus 4
Aux Bus 1
Aux Bus 2
Solo Left
Remote
Mute
Mute Logic
Pre-Aux
Buffers
Solo Right
L
R
L
R
Aux
Pre-Source
Select
Rear Connector Panel
3-4 Always
Summed Mono
Group 1
Feed Matrix
Ext Line In
Left
Feed
Right
Feed
Center
Feed
Mono
Feed
Matrix
Sum Amp Matrix Insert
-2dBu
Matrix Out
+4dBu
Matrix
Level
Post-Fader
Matrix - Monitoring Feeds
Pre-Fader
From Previous
Matrix Line In
To Next
Matrix Line In
Matrix Outputs
1 of 4 shown
Matrix 1 to 4
Tip
Ring
Mute 1
Mute 2
Mute 3
Mute 4
Mute Commands
to Channels
Mute Group
Masters
R
L
Right
Left
-12dB
Stereo
Record
Level Mute
Stereo
Record
Out
Right
Left
Pre
Signal Sources
Post-Fader
Signal Sources
Pre-Fader
Monitor
Level
Aux 1-2
Solo Off
Monitor
Out
Sum
Solo
Mix Amps
R
Solo DC
Solo
(Audio)
Trim
Trim Range
-12dB 0 +12dB
Solo to Meters
Ctrl Audio
Headphone
Level
Solo Off
Headphone
Jack (Top)
1/8”
Headphone
Jacks (Front)
1/4” and 1/8”
Monitor Source Select & Mode Select
Center Mono Aux
1-2
APB-DynaSonics
TB Mic
(Front)
OSC
1 kHz
Oscillator
TB / Osc
Level
TB / Osc
On
Tap
Latch
Logic
TB Assign
Aux 1-2
Aux 5-6
Grps
Power Supply & DC Status LEDs
+18V –18V +15V +48V
PSU GoodAB
Lamp
Intensity 4-Pin XLR for Right-Angle 12V Lamps
2 to 4 sockets fitted depending on Console size
Any style lamp can be used: Low-current LED to Hi-current Halogen
Power Distibution and Sharing
PSU A PSU B
ProDesk-4
DynaSonics
Block Diagram
PSU A
Power Distibution
To Modules
Chassis Ventilation & Cooling
+18V@10A
-18V @ 10A
+15V @ 5A
+48V @ 0.6A
Model: PS-450
Plug-In Power Supply
The ProDesk-4 normally ships with 1 supply,
an optional power supply can be fitted in all chassis sizes except for the 16-channel.
With 2 PSUs fitted, the total Console load is shared equally between the 2 supplies.
The supplies are easily removed for service or replacement (4 screws) and can be hot-swapped.
AC Inlet
15A IEC
L-R
+18V
Phant
Power Supply
APB-DynaSonics
Console Power Supply
Model PS-450
AC IN
100-240V
50 / 60 Hz
500W
PSU
Good
Power
ProDesk Rear Panel
3097042
Conforms to
ANSI/UL Std. 60065
Cert. To CAN/CSA
Std. C22.2 No. 60065
USC
ETL Classified
CAUTION
AVIS :RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR
RISK OF ELECTRIC SHOCK
DO NOT OPEN
PSU B
AC Inlet
15A IEC
APB-DynaSonics
Console Power Supply
Model PS-450
AC IN
100-240V
50 / 60 Hz
500W
PSU
Good
Power
3097042
Conforms to
ANSI/UL Std. 60065
Cert. To CAN/CSA
Std. C22.2 No. 60065
USC
ETL Classified
CAUTION
AVIS :RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR
RISK OF ELECTRIC SHOCK
DO NOT OPEN
+18V@10A
-18V @ 10A
+15V @ 5A
+48V @ 0.6A
ProDesk-4 Block Diagram ProDesk-4 Block Diagram
ProDesk Rear Panel
Group 2
Feed
Group 3
Feed
Group 4
Feed
External In
Peak
Sig
Group
Mix Amp
Group Insert
-2dBu
Group Out
+4dBu
Solo Left Tip
Ring
Solo Right
Peak
Sig
100mm
Group
Fader
Group Mix Bus
Group To
L-R
Left Bus
Right Bus
Group To
Center
Center Bus
Group To
Mono
Mono Bus
Group Bus
Assignments
Group Outputs
1 of 4 shown
Solo DC
10dB
Fader
Amp
Bus In
+4dBu
Solo Left
Solo Right
Solo DC
AFL
10dB
Power-OK
Command
OutSmarts
Balanced Driver
Mute-All
Command
Power-OK
Command
OutSmarts
Balanced Driver
Mute-All
Command
Aux
Mix Amp
Aux Insert
-2dBu
Aux Out
+4dBu
Solo Left Tip
Ring
Solo Right
Peak
Sig
Aux
Level
Aux Mix Bus
Aux Outputs
1 of 6 shown
Solo DC
Bus In
+4dBu
AFL on Aux 1 & 2
are Stereo-linked 10dB
Fader
Amp
Power-OK
Command
OutSmarts
Balanced Driver
Mute-All
Command
Use MODE switch to select desired meter response:
When MODE switch is pressed,
STATUS LED will illuminate and show current mode:
Amber= Average + Peak
Green= Average Only
Red= Peak Only
Status LED will remain illuminated for a few seconds-
Pressing MODE switch when LED is illuminated will step to next mode,
LED will change color.
If MODE switch is not re-pressed when LED is still illuminated,
meter status remains in its current mode.
STATUS LED- Additional Function:
If Mute-All is activated (via Phoenix connector on rear panel),
STATUS LED will blink RED approx twice per second.
The 4 meter arrays will be turned off and all XLR outputs will be muted.
Pan
to L-R
Mtx Pre
Matrix Feed
Group Output
Meter
(VU-Response)
100mm
Stereo
Fader
5-6
Pre 5
6
Aux Bus 5
Aux Bus 6
Grp3 Bus
Grp4 Bus
Grp1 Bus
Grp2 Bus
- 6
- 6
Bal
XLR In
Preamp / EQ
Sub-Board
Gain
15 - 65 dB
Four Band EQ
Level
Hi Freq
HPF
Pad
Solo DC
Direct
Out
+4dBu
Pan
Pot
1-2
Pre 1
Insert
+4dBu
+48V EQ On
Pk
8
0
6
12
Sig
Fader Amp
Pre
Fader
Solo Left
Hi-Pass
-12dB/Oct
20Hz - 400Hz Chan
LED
Meter
Bus Assignment
and
Pan Circuitry
2
3
4
5
6
Aux Sends
Direct Out
– User Options –
Post
Insert
Polarity
100mm
Channel
Fader Aux Bus 1
FET
Mute
Line In
Line
In
Pre
Amp Pre Fader
Rear
Connector
Panel Level
Lo Freq
Level
Hi Mid
400 - 8kHz
Freq LevelFreq
Lo Mid
80 - 2kHz L-RCenterMono
Left Bus
Right Bus
Center Bus
Mono Bus
From
Mic Pre
1-2
Stereo
Aux Pre
Pre-Fdr
Pre-EQ
Aux Bus 2
Aux Bus 3
Aux Bus 4
Aux Bus 5
Aux Bus 6
Solo Right
To
Aux
Mutes
From
Mute Logic
Aux “Pre”
Buffer
Pre-EQ
– User Options –
Post
HPF
Post
Insert
To
Direct Out
Options
3-4
Pre
5-6
Pre
ProDesk-4 Mono Inputs
Channels 1-48
Tip
Ring
Tip
Ring
Grp
1-2 Grp 3-4
Group-1 Bus
Group-2 Bus
Group-3 Bus
Group-4 Bus
Dir Out
Buffer
Post
Fader
From
Fader Amp
10dB
Default
Setting
Default
Setting
10kHz
Shelf 60Hz Shelf
FET
Mute
HPF
On
5-6 Always
Summed Mono
Aux
Mute
FETs
Scene Mute Select
3
4
1
2
Remote
Mute
Scene Mute Select
3
4
1
2
Mute Logic
From
Scene
Mute
Switches
For Stereo Inputs A-B-C
Alt Input is
Rear-Panel RCA jacks
“Pinkish”
Noise
Noise
Ref
Signal
TB
Mic
60Hz
Output
Un-Mute
Relay
Main
Mix Amp Main Insert
-2dBu
Main Out
+4dBu
Tip
Ring
Peak
Sig
100mm
Main
Fader
Main Mix Bus
Main Outputs
1 of 4 shown
10dB
Fader
Amp
Bus In
+4dBu
Mute
Power-OK
Command
OutSmarts
Balanced Driver
Mute-All
Command
Matrix
Pre
Matrix Feed
Left, Right, Center, Mono
Output
Un-Mute
Relay
Output
Un-Mute
Relay
Output
Un-Mute
Relay
DC-Status & Power-OK Commands
For L&R Outputs:
Single, Stereo Fader used
Single, Matrix-Pre switch
used for all 4 Main outputs
Pre-Fader
Mains - Monitoring Feeds
Post-Fader
Post-Fader
Aux - Monitoring Feeds
Pre-Fader
Interconnection
Between Modules
Interconnection
Between Modules
USB In/Out
Stereo-Audio Codec
(Rear) Stereo
Program In Stereo
Record/Alt Out Monitor Out Left, Right, Sum-Mono
Mute-All
Command
Mtx
1-2
L
Sum
Mono
Mtx 1-2
Mono
Center
Right
Left
Aux 1-2
Mtx 1-2
Mono
Center
Right
Left
Solo Mix
R
Solo Mix
L
Pre
Signal Sources
Post-Fader
Signal Sources
Pre-Fader
Sum
Mono
Aux 1-2
Mtx 1-2
Mono
Center
Right
Left
Mtx 3-4
Aux 1-2
Mtx 1-2
Mono
Center
Right
Left
Mtx 3-4
Center Mono Aux
1-2
L-R Mtx
1-2
Source Select & Mode Select
Solo Left
Solo Right
Solo DC
PFL
USB
Master Interface Panel
Top
Analog
Rear
Analog
Rear
USB
Stereo
Program
Level
HF
Level
Hi Freq
10kHz
LF
Level
Lo Freq
60Hz
Stereo EQ
Mute
Peak
Sig
Peak
Sig
Left - Right
(Rear) Stereo
Program In
USB Stereo
Audio In
Solo Left
Solo Right
Solo DC
AFL
Feed to
USB Out
Center Mono Aux
1-2
L-R Mtx
1-2 Mtx
3-4
Bus Assign
Left Bus
Right Bus
Center Bus
Mono Bus
Matrix-3 Bus
Matrix-4 Bus
Aux-1 Bus
Aux-2 Bus
∑
Top-Panel
Mounted
Mini-jack
∑
∑
∑
∑
∑
Driver &
Protection
Circuits
9
6
3
0
3
6
12
24
Console Power Status and Illumination
Located on Front and Rear of Console Top Rail
Stereo Program In
Stereo Record/Alt Out
Monitor & HP Control
Stereo Program
Input Source Select
(Summed)
Aux 3-4
L-R
M
Mtrx
C
Talkback & Oscillator
Located on Rear of Console
Fader-Flip Available on Mono Bus:
Swap Controls & Indicators with Aux 6
See Aux Block Diagram (above) for details
2-Pin Phoenix
Main Metering
The meters are capable of displaying 3 different types of ballistic response:
Average (VU-style), Peak (PPM-style), or a combination of both.
Average Response is displayed as a slow bargraph
Peak response is dispayed as a fast bargraph
When both are active, Peak shows as a single LED above a bargraph
Solo Audio & Control
For Stereo Input D
Alt Input from USB Audio In
+6
+6
To Stereo Input D
Alt-Input
Fader-Flip Available
on Aux 6:
Swap Controls &
Indicators
with Mono bus.
Mute
AFL Level
Peak
Sig
Mute
Peak
Sig
Level
Fader-Flip Switch
(Located above Mono Fader)
Aux 6
Mono Aux 6
Mono
Matrix-1 Bus
Matrix-2 Bus
(Optional)
L
R
Default
Setting
Mute
Mute
AFL
Mute
AFL
Mute
PFL
10dB
∑
RCA
Jacks Female XLR Male XLR 1/4” TRS 1/8” TRS Rotary Control 100mm Fader Small Switch Illuminated Switch Indicator LED Internal User Options FET Switch GP • Summing • X-Gain Amplifiers
10dB
10dB
Rectifier • Peak Det
Metering
Block Diagram Legends
To Peak
Circuit
26dB
Pad
26dB
Pad
Matrix
Mix

APB-DynaSonics
12
MONO INPUT
Preamp Controls
+48-Volt Phantom Power Sw tch w th LED
When depressed, provides +48-Volt phanto power to the XLR connector. Phanto power is
required for operation of any condenser icrophones. See your icrophone instructions to see if
phanto power is required or is to be defeated (so e - though few - icrophones require phanto
power NOT be activated or they ay be da aged). A Red LED illu inates when this switch is
activated.
Note: After phanto is turned on or off, there will be residual DC voltage on the input stage
co ponents. While this voltage is discharging (this ay take up to a inute), there ay be pops or
clicks heard when the Pad or Line switch is activated.
M c/L ne Sw tch
With the switch UP, selects the XLR connector; with the switch DOWN, selects the line input source
on the 1/4” TRS jack. Additionally, the signal feeding the XLR jack is nor alled into the 1/4”
connector; this allows a line-level signal to be plugged into the XLR jack and selected with the Line
switch (Down). This avoids the need for an XLR to 1/4” adaptor for this purpose. When a plug is
inserted into the 1/4” jack, this nor alling-connection fro the XLR jack is broken and 2 separate
input sources can be selected (XLR or 1/4”).
Polar ty Reverse Sw tch
When depressed, reverses the electrical input polarity of any icrophone or line level input signal.
Use of this control ay alter the sound quality of an input relative to other channels when ultiple
icrophones are picking up the sa e sound. (In the past, any consoles labeled this function as
“Phase” or used the Ø sy bol).
Pad Sw tch
When depressed, inserts a 26dB pad into the icrophone input signal path prior to the prea plifier
stage to prevent overload by excessively high input signal levels. Use this pad switch when you find
that you are operating the gain control in the lower 20% of the control range and still showing
excessive signal levels (yellow and red indications) on the channel eters.
Input Ga n Control
This control adjusts the a ount of gain at the input stage and should be adjusted for the best signal
perfor ance within the console. The goal is to achieve the best signal-to-noise while a plifying
input signals to workable levels, neither too high nor low. The channel’s six-seg ent LED eter is
used for visualization of proper (pre-fader) channel levels, while soloing the channel will give ore
detailed level infor ation. Proper level is achieved when there is continuous full green illu inated
when input sources are at their highest levels with rare flashes of the yellow and red LED’s..
Note: This control is so eti es referred to as the channel “Tri ” control.

ProDesk-4 OWNER’S MANUAL
13
MONO INPUT - EQUALIZATION
H gh-Pass F lter Control
Adjust the high-pass filter corner frequency between 20Hz and 400Hz at a roll off rate of 12dB per
octave. This control is used to re ove unwanted signal content below the set frequency such as
stage ru ble. The result is usually i proved signal quality of the associated input signal while
decreasing the low frequency a plification de and of the audio syste s a plifier and speaker
co bination. This type of filter is also called a Low-Cut filter.
H gh-Pass F lter On Sw tch w th LED
When depressed, activates the high pass filter (reducing the level of all frequencies below the set
frequency). When this switch is activated, an associated green LED will illu inate.
H gh-Freq Level Control (Shelv ng)
Adjust the high frequency boost/cut between +/-15dB; there is a detent at the center “0” position.
Boost or cut of the high frequency level control is usually used for inor tonal adjust ents. The HF
EQ has a shelving response with a corner frequency of 10kHz.
H gh-M d Freq Control (Bell shape)
This control adjusts the center frequency of the high- id frequency band EQ between 400Hz and
8kHz. The bandwidth is approxi ately one octave.
H gh-M d Level Control
Adjust the high- id band boost/cut between +/-15dB; there is a detent at the center “0” position.
The high- id frequency controls are used for inor tonal adjust ent or repair of a specific band
of frequencies.
Low-M d Freq Control (Bell shape)
This control adjusts the center frequency of the low- id frequency band between 80Hz and 2 kHz.
The bandwidth is approxi ately one octave.
Low-M d Level Control
Adjust the low- id frequency boost/cut between +/-15dB; there is a detent at the center “0”
position. The low- id frequency controls are used for inor tonal adjust ent or repair of a
specific band of frequencies.
Low-Freq Level Control (Shelv ng)
Adjust the low frequency boost/cut between +/-15dB; there is a detent at the center “0” position.
Boost or cut of the low frequency level control is usually used for inor tonal adjust ents. The LF
EQ has a shelving response with a corner frequency of 70Hz.
EQ-On Sw tch w th LED
This switch places the EQ circuitry into the channel’s signal path. EQ activation is displayed by the
illu ination of a green LED next to the EQ on switch. When not in use, it is suggested that the EQ
switch be kept in the OFF position for the best audio perfor ance (less circuitry in the path).

APB-DynaSonics
14
MONO INPUT - AUXILIARY SENDS
Aux 1-6 Pre-Fader / Pre-EQ Sw tch
This switch defines the “Pre” signal source for all Auxes:
Up is Pre-Fader (and Post-EQ), Down is Pre-EQ.
Internally, the default Pre-EQ source is set to Post-insert.
A qualified technician can change this to Pre-insert (Post HPF) on a channel-by-channel basis.
Aux Sends 1-2 can be selected between mono and stereo:
Aux 1 Level Control
When in nor al (Mono) ode, this knob controls the signal level feeding the Aux 1 ix bus.
When the Aux 1-2 Stereo switch is depressed, this control is now reconfigured into a pan control,
which adjusts the balance of channel signal being fed to Aux buses 1-2.
Aux 2 Level Control
When in nor al (Mono) ode, this knob controls the signal level feeding the Aux-2 ix bus.
When the Aux 1-2 Stereo switch is engaged, this control beco es the Aux 1-2 level control.
Aux 1-2 Post-Fader/Pre-Source
T h i s s w i t c h s e l e c t s t h e s i g n a l s o u r c e f o r A u x e s 1 - 2 b e t w e e n P o s t - f a d e r ( U p ) a n d P r e - S o u r c e ( D o w n )
a s d e t e r i n e d b y t h e A u x P r e - S o u r c e s e l e c t s w i t c h ( a b o v e ) .
Aux 1-2 Stereo Sw tch
Reconfigures the individual Aux 1 and 2 controls fro two level controls to a Pan control (1) and a
Level control (2). This enables a stereo ix to be generated fro within the Aux send section for
use with stereo headphones, effects, or for a discrete stereo ix for recording or broadcast use.
Aux Sends 3-4 and 5-6 are always mono:
Aux Level Controls 3-4
Controls the ix levels of the channel into Aux buses 3 & 4.
Aux 3-4 Post-Fader/Pre-Source
This switch selects the signal source for Aux 3-4 between Post-Fader (Up) and Pre-Source (Down).
Aux Level Controls 5-6
Controls the ix levels of the channel into Aux buses 5 & 6.
Aux 5-6 Post-Fader/Pre-Source
This switch selects the signal source for Aux 5-6 between Post-Fader (Up) and Pre-Source (Down).
D screte Sub Woofer Feed Us ng Aux Sends (Aux-Fed Sub)
Aux 6 should be used if a controlled-level Subwoofer send is desired. In the Master Section, the
output level control for Aux 6 can be swapped fro its default rotary control to the (Mono)
100 fader. This gives the operator a convenient and precise level control to adjust the
Subwoofer output. See the Master Section of the anual for ore details.

ProDesk-4 OWNER’S MANUAL
15
MONO INPUT - MUTE, SOLO and LEVEL CONTROL
Mute Sw tch (Local) - Internally Illum nated
Activation of this latching switch will ute the pri ary outputs as well as all pre and post fader
auxiliary sends of the channel. When depressed, it will illu inate RED, indicating the status of this local
ute only; an additional LED (located along the fader track) indicates the status of any re ote
activated utes. Activation of either ute syste (local or re ote) will not affect the channel's
etering or the PFL signals; these are both located Pre-Fader/Pre-Mute. The ute syste ay affect
the Direct Out signal depending on its option setting. See the Rear Panel description for ore
infor ation.
Channel Level Meter
This 6-seg ent LED eter indicates the Pre-fader channel level; the “0” LED indicates approx. +4dBu
signal level (the design-level for the channel). Four green LED seg ents indicate Pre-fader levels of
Signal Present, -12dB, -6dB and 0dB. The signal present LED first illu inates at approxi ately –30dB
and increases in brightness with level until it is at full intensity. Best operation is achieved when all the
green LEDs are illu inated with average input signals with occasional short yellow/red bursts of the
+8 and peak LEDs. A yellow LED illu inates in the caution zone at +8dB above the reference level. The
top seg ent peak indicator will illu inate Red if any of the ultiple sa ple points in the channel’s
signal path approach within 3dB of clipping.
Please Note: The overall channel eter should be considered as 2 separate onitoring indicators: the
Green and Yellow LEDs are Average responding and show the Pre-fader level ONLY; the faster Red
LED is onitoring the pre-fader signal AND the Prea p and Post-fader signals. So, it is possible to
have the Red LED illu inate without first having the Yellow LED lit. This usually will be caused by
excessive prea p levels (and a subsequent cut in the EQ), or there ay be a co pressor or li iter in
the channel’s insert part that is attenuating the Pre-fader signal (Green & Yellow LEDs), but the prea p
signal feeding the co pressor is approaching clipping. The usual cure is to turn down the channel’s
Gain control.
Mute Group Preset Sw tches 1 thru 4
When any of these switches are selected, the input channel will ute when the associated Mute
Group switch within the Master section is depressed. Activation of a Re ote ute affects the channel
the sa e way as a Local Mute.
Remote Mute (R Mute) Act vated LED
This LED will illu inate (Red) when the channel is uted by any of the 4 Mute Groups.
100mm Channel Fader
This fader adjusts the post-fader level of the channel. All bus assign ents and all post-fader Aux sends
are controlled by this fader.
PFL (Solo) Sw tch - Internally Illum nated
This latching switch will illu inate yellow when activated. It will route the Pre-fader channel signal to
the Master section for display on the Master solo eters and into the onitor/headphone syste s.
The channel feed to the Solo syste is ono.

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MONO INPUT - BUS ASSIGNMENT AND PANNING
Pan Control
This control blends the post-fader signal between any of the assigned bus pairs: L-R, Group1-2 and
Group 3-4. When at the center, detented position, both sides are fed equal a ounts of signal (each
down by 3dB). This pan control has no effect on the Mono or Center ix buses.
Mono Ass gnment Sw tch
Assigns the post-fader channel signal to the Mono ix bus. It can be used as a general-purpose
post-fader output for an additional pri ary console output. It ay also be used as Mix B of an A-B
vocal ix.
Center Ass gnment Sw tch
Assigns the post-fader channel signal to the Center ix bus. In ono sound syste s, this bus can be
used as the pri ary output (leaving the L-R output available for stereo recording). It is usually used
in LCR installations to feed a discrete signal to the center speaker. It ay also find use as a general-
purpose post-fader output for use as an additional Aux or atrix send or as Mix A of an A-B vocal
ix.
L-R Ass gnment Sw tch
Assigns the post-fader channel signal to the Left-Right ix buses through the Pan Control.
1-2 Ass gnment Sw tch
Assigns the channel signal to the Group 1 & 2 ix buses through the Pan Control. The Groups can
be used independently using their own insert & XLR output jacks, or used as subgroups and
assigned back into the Main ix buses (See Master Section- Groups).
3-4 Ass gnment Sw tch
Assigns the post-fader channel signal to the Group 3 & 4 ix buses through the Pan Control.
Operation is the sa e as the Group 1 & 2 assign ent.

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17
MONO INPUT - REAR PANEL CONNECTORS
1/4” TRS D rect Output Connector
The connector provides an i pedance-balanced line level output of the input channel’s signal. The
default Direct Out signal is AFTER the icrophone prea plifier but before all other processing.
This utility output can be used to feed a ulti-track recording device, effects device, or to feed
another ixing or processing device including distributed onitor ixing syste s.
Operating level is +4dBu
Direct Output - Internal Options
Internal ju pers ay be configured (on a channel-by-channel basis) to change the Direct Out to
Post-insert, Pre-fader or Post-fader. The Direct Output is always active and not affected by the
channel Mute switch unless the Post-fader internal-option is i ple ented.
(Any changes to the Direct Output source should be ade by a qualified technician)
1/4” TRS Insert Connector
This connector allows external processing or effects devices to be inserted into the channel’s signal
path after the variable high pass filter. The TRS jack is wired as follows:
Tip= Send
Ring= Return
Sleeve= Chassis
Exa ples of external devices include additional equalization, notch filters, co pressors, li iters,
vocal doublers and har onizers, reverb devices, etc. The insert send has an output i pedance of
100 Ω unbalanced and the insert return has an input i pedance of 5k Ω unbalanced.
Operating level is +4dBu.
NOTE: The user should ensure that any device inserted into the channel’s signal path is capable of
aintaining the signal integrity of the console. The device ust be able to accept a +22dBu signal
without clipping, and have an output i pedance of 100 Ω or less and be capable of driving
+22dBu into a 2k Ω load.
1/4” TRS L ne Input Connector
This connector accepts line input signals and has an input i pedance of 10k Ω. When the front
panel source switch is selected to line input, signal is first sourced fro this connector. If nothing is
plugged into this connector, the XLR input is nor alled into this connector as a line input signal;
plugging into the connector breaks this nor alling contact. The line input ay be a balanced or
unbalanced signal.
XLR Input Connector
This connector accepts icrophone or line input signals. When the front panel input source switch
is in the icrophone position (Up), this XLR connector will be used as a icrophone input and will
have an input i pedance of >3000 Ω. When the input selector source switch is in the LINE input
position (Down) and nothing is plugged into the TRS line input connector, this XLR connector can
be used as a balanced line input with an input i pedance of >10k Ω.
Note: This is a locking connector. To re ove an XLR cable, depress the Tab on the connector
before atte pting to re ove the cable.

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STEREO LINE INPUT
TRS/ALT (RCA OR USB) L ne Input Sw tch
Selects the stereo input source between the rear-panel 1⁄4” TRS jacks (switch UP) or the RCA
connectors (switch DOWN) on Inputs A-B-C. On Stereo Input D, the USB Audio In signal is selected
when this switch is depressed (there are no RCA jacks for Input D). See the later section on USB
audio for ore infor ation on its use.
Left Input Ga n Control
This control is used to adjust the input gain of the left line input for opti u electrical
perfor ance without producing audible noise (hiss) at high gain settings. The channel LED
eters and the solo eters are used in assisting in setting the control for correct gain. Separate
left and right input gain controls are provided to allow for better signal opti ization when
operated in split track ode.
R ght Input Ga n Control
This control is used to adjust the input gain of the right line input signal for opti u electrical
perfor ance without producing audible noise (hiss) at high gain settings. The channel LED
eters and the solo eters are used in assisting in setting the control for correct gain levels.
Separate left and right input gain controls are provided to allow for better signal opti ization
when operated in split track ode.
Stereo Spl t-Track Mode Sw tch
This switch converts the channel fro conventional Stereo input operation to a dual- ono “Split
Track” channel. This function is ost useful when dealing with the Voices-Left/Music-Right
sources co only used in House of Worship perfor ances. The two Split-Track controls allow
the operator to independently control the blend of the L&R channel signals feeding the Auxes
and the Main buses.
Pre-Aux Feed (Aux Send Blend Control)
W h e n t h e “ S p l i t T r a c k ” o d e s w i t c h i s p r e s s e d , t h e P r e - A u x F e e d c o n t r o l w i l l b e a c t i v e . T h i s c o n tr ol
a l l o w s t h e o p e r a t o r t o a d j u s t t h e o n o - i x t u r e o f t h e l e f t & r i g h t i n p u t s i g n a l s . f e e d i n g t h e “ Pre ”
s o u r c e t o t h e A u x e s . W h e n t h i s c o n t r o l i s s e t f u l l y c o u n t e r - c l o c k w i s e , t h e p r e - f a d e r s o u r c e f o r t h e
a u x i l i a r y s e n d s i s t h e le ft l i n e i n p u t O N L Y . W h e n s e t f u l l y c l o c k w i s e , t h e p r e - f a d e r s o u r c e f o r t h e
a u x i l i a r y s e n d s i s t h e ri gh t l i n e i n p u t O N L Y . W h e n s e t t o i t s c e n t e r p o s i t i o n , t h e r e i s a n e q u a l a o u n t
o f l e f t a n d r i g h t i n p u t s i g n a l b e i n g s e n t i n s u e d - o n o t o t h e a u x i l i a r y s e n d c o n t r o l s . F r o t h e
c e n t e r p o s i t i o n , t u r n i n g t h e c o n t r o l c l o c k w i s e w i l l i n c r e a s e t h e a o u n t o f r i g h t i n p u t w h i le de cre as in g
t h e l e f t i n p u t s i g n a l b e i n g s e n t t o t h e a u x i l i a r y c o n t r o l s . T u r n i n g t h e c o n t r o l c o u n t e r - c l o c kwi se wi ll
i n c r e a s e t h e a o u n t o f l e f t i n p u t w h i l e d e c r e a s i n g t h e r i g h t i n p u t s i g n a l b e i n g s e n t t o t h e aux ili ar y
c o n t r o l s .
Pre-Fader Blend (Channel Blend Control)
When the “Stereo Split Track” switch is pressed, the Pre-Fader Blend control will be active; this
effectively turns the stereo signal within the odule into a su ed- ono signal. The Blend
control allows the operator to adjust the ixture of the L&R signals aking up that ono ix.
When this control is set fully counter-clockwise, the channel ix is the left line input ONLY. When
this control is set fully clockwise, the channel ix is the right line input ONLY. When set to its
center position, there is an equal a ount of left and right input signal being co bined within the
channel. Fro the center position, turning the control clockwise will increase the a ount of right
input while decreasing the left input signal being sent to the ix controls. Turning the control
counter-clockwise will increase the a ount of left input while decreasing the right input signal
being ixed within the channel.

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19
STEREO LINE INPUT - STEREO EQUALIZATION
H gh Frequency Level Control (Shelv ng)
Adjusts the high frequency shelving cut/boost between +/-15dB. Boost or cut of the high
frequency level control is usually used for inor tonal adjust ents. Use of this EQ control will
affect both the left and right signal paths. The HF EQ has a shelving response with a corner
frequency of 10kHz.
H gh-M d Frequency Level Control (Bell-shape)
Adjusts the high- id frequency bell-shaped cut/boost between +/-15dB. Use of this control will
affect both the left and right signal paths. The Hi-Mid EQ has a center frequency of 3kHz with a BW
of 1 octave.
Low-M d Frequency Level Control (Bell-shape)
Adjusts the high- id frequency bell-shaped cut/boost between +/-15dB. Use of this EQ control will
affect both the left and right signal paths. The Low-Mid EQ has a center frequency of 300Hz with a
BW of 1 octave.
Low Frequency Level Control (Shelv ng)
Adjusts the low frequency shelving cut/boost between +/-15dB. Boost or cut of the high frequency
level control is usually used for inor tonal adjust ents. Use of this EQ control will affect both the
left and right signal paths. The LF EQ has a shelving response with a corner frequency of 60Hz.
EQ-On Sw tch w th LED
This switch inserts the Left and Right EQ circuitry into the signal path. Stereo EQ activation is
displayed by the illu ination of the green LED next to the EQ ON switch. When not in use, it is
suggested that the EQ switch be kept in the OFF position for best audio perfor ance.

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STEREO LINE INPUT - AUX SENDS
Stereo Channel Aux Sends
The signals feeding the Aux sends are nor ally su ed- ono ixes of the left & right side signals within the odule.
For Auxes 1& 2, when switched to Stereo, the left-side channel signal feeds the Aux 1 control; the right-side channel signal
feeds the Aux 2 control. This is true for both Pre & Post signals –however-, if Split-Track is activated, both the Post-fader and
the Pre-Aux signals have already been converted to ono by the Blend controls, so Aux 1&2 will receive a su ed- ono
signal even when Stereo is selected.
Aux Level Control 1
Adjusts the level of the selected Aux feed into Aux bus 1.
Aux Level Control 2
Adjusts the level of the selected Aux feed into Aux bus 2.
Aux 1-2 Pre Sw tch
This switch selects the signal source for Aux sends 1 and 2 between Post-fader (Up) and the default
“Pre” signal (Down).
Aux 1-2 Stereo Sw tch
Reconfigures the signals feeding the individual Aux 1 and 2 level controls fro a su ed ono
ix to separate left & right signals; left feeds Aux-1, right feeds Aux-2.
NOTE: If Split-Track is active, both of the sends receive the sa e ono- ix fro the either the Pre-
fader Blend control (when in Post), or the Pre-Aux Feed control (when in Pre).
Aux Level Control 3
Adjusts the level of the selected Aux feed into Aux bus 3.
Aux Level Control 4
Adjusts the level of the selected Aux feed into Aux bus 4.
Aux 3-4 Pre Sw tch
This switch selects the signal source for Aux ixes 3 and 4 between Post-fader (Up) or Pre (Down).
The feed to these Auxes is always a su of the left & right channel signals.
Aux Level Control 5
Adjusts the level of the selected Aux feed into Aux bus 5.
Aux Level Control 6
Adjusts the level of the selected Aux feed into Aux bus 6.
Aux 5-6 Pre Sw tch
This switch selects the signal source for Aux ixes 5 and 6 between Post-fader (Up) or Pre (Down).
The feed to these Auxes is always a su of the left & right channel signals.
D screte Sub Woofer Feed Us ng Aux Sends (Aux-Fed Sub)
Aux 6 should be used if a controlled-level Subwoofer send is desired. In the Master Section, the output level control for Aux 6
can be swapped (Fader-Flip) fro its default rotary control to the (Mono) 100 fader. This gives the operator a convenient
and precise level control to adjust the Subwoofer output. See the Master Section of the anual for ore details.