Page is loading ...
ALM-12d Digital Audio Console
TECHNICAL MANUAL
October 2001
R-16 / Dec 1997
ALM-12d Digital Audio Console Technical Manual - 1st Edition
©2001 Auditronics® *
AUDITRONICS
600 Industrial Drive
New Bern, North Carolina 28562
252-638-7000
*a division of Wheatstone Corporation
ALM-12d / Oct 2001
AA
AA
ATTENTIONTTENTION
TTENTIONTTENTION
TTENTION
RR
RR
READEAD
EADEAD
EAD M M
M M
MEE
EE
E!!
!!
!
ALM-12d / Oct 2001
Attention!
FF
FF
Federal Communications Commission (FCC)ederal Communications Commission (FCC)
ederal Communications Commission (FCC)ederal Communications Commission (FCC)
ederal Communications Commission (FCC)
Compliance Notice:Compliance Notice:
Compliance Notice:Compliance Notice:
Compliance Notice:
Radio FRadio F
Radio FRadio F
Radio Frequency Noticerequency Notice
requency Noticerequency Notice
requency Notice
NOTE:NOTE:
NOTE:NOTE:
NOTE: This equipment has been tested and found to comply with the
limits for a Class A digital device, pursuant to Part 15 of the FCC rules. These
limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment.
This equipment, generates, uses and can radiate radio frequency energy
and, if not installed and used in accordance with the instruction manual,
may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in
which case the user will be required to correct the interference at his own
expense.
!
This is Class A product. In a domestic environment,This is Class A product. In a domestic environment,
This is Class A product. In a domestic environment,This is Class A product. In a domestic environment,
This is Class A product. In a domestic environment,
this product may cause radio interference, in which case,this product may cause radio interference, in which case,
this product may cause radio interference, in which case,this product may cause radio interference, in which case,
this product may cause radio interference, in which case,
the user may be required to take appropriate measures.the user may be required to take appropriate measures.
the user may be required to take appropriate measures.the user may be required to take appropriate measures.
the user may be required to take appropriate measures.
This equipment must be installed and wired properly in order to assure
compliance with FCC regulations.
Caution!Caution!
Caution!Caution!
Caution!
Any modifications not expressly approved in writing by Any modifications not expressly approved in writing by
Any modifications not expressly approved in writing by Any modifications not expressly approved in writing by
Any modifications not expressly approved in writing by
Auditronics could void the user's authority to operate this equipment.Auditronics could void the user's authority to operate this equipment.
Auditronics could void the user's authority to operate this equipment.Auditronics could void the user's authority to operate this equipment.
Auditronics could void the user's authority to operate this equipment.
page Contents – 1
ALM-12d / Oct 2001
CONTENTS
ALM-12d Technical Manual
Table of Contents
Chapter 1 – Installation and Power
Unpacking the Console ................................................................1-2
Countertop Mounting....................................................................1-2
System Ground .............................................................................1-3
Power Supply ................................................................................1-4
The PSC-D340 Power Supply .................................................................................. 1-4
Power Connector Pinout........................................................................................... 1-5
PSC-D340 Power Supply Schematic ....................................................................... 1-6
Failsafe Dual Redundant Supply.............................................................................. 1-7
Energizing ................................................................................................................. 1-7
Audio and Control Wiring.............................................................1-7
Connection Procedures ............................................................................................ 1-8
Digital Audio Connections ........................................................................................ 1-8
Unbalanced Connections (analog audio) ................................................................. 1-8
Hand Crimp Tool Wiring Instructions........................................................................ 1-9
Chapter 2 – Console Features
Overview ........................................................................................2-2
Inputs .............................................................................................2-3
Analog Mono Mic Level Inputs ................................................................................. 2-3
Analog Stereo Line Level Inputs .............................................................................. 2-3
Digital Stereo Line Level Inputs................................................................................ 2-3
Producer Talkback Input........................................................................................... 2-3
Sources ..........................................................................................2-3
Faders ............................................................................................2-4
Outputs ..........................................................................................2-4
Mutes and Tallies ..........................................................................2-4
Other Features...............................................................................2-5
Console Layout Drawing ..............................................................2-6
page Contents – 2
ALM-12d / Oct 2001
CONTENTS
Chapter 3 – Fader Section
Overview ........................................................................................3-2
Hook-ups........................................................................................3-3
Microphone Inputs ......................................................................3-3
Stereo Line Analog Inputs..........................................................3-3
DB-25 “Line In 1-4” Connector ............................................................................. 3-3
DB-25 “Line In 5-8” Connector ............................................................................. 3-4
DB-25 “Line In 9-10, TB IN” Connector................................................................ 3-5
Stereo Line Digital Inputs...........................................................3-5
Logic Control Ports.....................................................................3-6
Mic Port Functions................................................................................................ 3-6
Line Port Functions............................................................................................... 3-7
Logic Port Wiring Considerations ......................................................................... 3-7
DB Connector Pinout Drawings
Mono Mic Inputs ....................................................................................................... 3-9
Stereo Line Analog Inputs ....................................................................................... 3-10
Stereo Line Digital Inputs ........................................................................................ 3-11
Logic Control Ports .................................................................................................. 3-12
Chapter 4 – Phone Section
Overview ........................................................................................4-2
Hook-ups........................................................................................4-4
DB Connector Pinout Drawing.....................................................4-5
Chapter 5 – Monitor Section
Control Room Monitor
Overview ................................................................................................................... 5-2
Studio Monitor
Overview ................................................................................................................... 5-3
Meter Section
Overview ................................................................................................................... 5-4
Tallys ..............................................................................................5-5
On-Air Tally Circuit.................................................................................................... 5-6
Hook-Ups .......................................................................................5-7
Monitor Outputs ........................................................................................................ 5-7
Tallys......................................................................................................................... 5-7
DB Connector Pinout Drawings
Monitor Outputs ........................................................................................................ 5-8
Tallys......................................................................................................................... 5-9
page Contents – 3
ALM-12d / Oct 2001
CONTENTS
Chapter 6 – Control Section
Overview ........................................................................................6-2
Chapter 7 – Timer Section
Overview ........................................................................................7-2
Chapter 8 – Master Outputs
Overview ........................................................................................8-2
Hook-Ups .......................................................................................8-3
Analog outputs.......................................................................................................... 8-3
Digital Outputs .......................................................................................................... 8-3
DB Connector Pinout Drawing.....................................................8-5
Chapter 9 – Console Operation
Introduction ...................................................................................9-3
Console Overview .........................................................................9-3
The Basics..........................................................................................9-3
Inputs ..................................................................................................9-3
Analog Mono Mic Level Inputs ......................................................................... 9-3
Analog Stereo Line Level Inputs ...................................................................... 9-3
Digital Stereo Line Level Inputs ....................................................................... 9-4
Producer Talkback Inputs................................................................................. 9-4
Sources...............................................................................................9-4
Faders - Using the Inputs..................................................................9-4
Phone Faders ................................................................................................... 9-4
Outputs ...............................................................................................9-4
Other Features ...................................................................................9-5
Fader Section ................................................................................9-5
Select Button......................................................................................9-5
Bus Assign Buttons ..........................................................................9-6
Cue Button .........................................................................................9-6
Display ................................................................................................9-7
Fader ...................................................................................................9-7
ON and OFF Buttons .........................................................................9-7
Phone Section ...............................................................................9-7
The Phone Section Is Different Than a Normal Fader ...................9-7
Select Button......................................................................................9-8
On Air Caller Feed Selection............................................................................ 9-8
page Contents – 4
ALM-12d / Oct 2001
C O N T E N T S
Auto Selection of On Air Caller Feed................................................................9-8
Off Air Caller Feed Selection............................................................................9-9
Selection Timeout..............................................................................................9-9
Bus Assign Buttons ..........................................................................9-9
Cue Button..........................................................................................9-9
Display ...............................................................................................9-10
Faders ................................................................................................9-10
ON and OFF Buttons ........................................................................9-10
Monitor Section ............................................................................9-10
Control Room Monitor......................................................................9-10
CR Select Button ............................................................................................. 9-11
CR Display.......................................................................................................9-11
CR Level Control ............................................................................................. 9-11
CUE Level Control...........................................................................................9-12
Headphone Level Control................................................................................ 9-12
CUE Interrupt................................................................................................... 9-12
Studio Monitor ..................................................................................9-12
ST Select Button..............................................................................................9-13
ST Display ....................................................................................................... 9-13
ST Level Control..............................................................................................9-13
Talkback Button............................................................................................... 9-14
Meter Section ....................................................................................9-14
VU Meter Pairs ................................................................................................ 9-14
Meter Select Button......................................................................................... 9-15
Meter Display................................................................................................... 9-15
Control Section ............................................................................9-15
Channel Display .............................................................................................. 9-15
Source Display................................................................................................. 9-15
Select Knob ..................................................................................................... 9-15
Enter Button..................................................................................................... 9-15
Mix-Minus Button.............................................................................................9-16
Checking Mix-Minus Status............................................................................. 9-16
Timer Section ...............................................................................9-16
Timer Display ....................................................................................9-16
Timer Controls ..................................................................................9-17
Logic Ports ...................................................................................9-17
Mic Port Functions ...........................................................................9-17
ON Logic Input.................................................................................................9-17
OFF Logic Input............................................................................................... 9-17
Cough Logic Input ........................................................................................... 9-18
Talkback to CUE Logic Input...........................................................................9-18
ON Tally Logic Input........................................................................................ 9-18
Line Port Function ............................................................................9-18
Start Logic Input .............................................................................................. 9-18
page Contents – 5
ALM-12d / Oct 2001
CONTENTS
Stop Logic Input............................................................................................... 9-18
ON Logic Input................................................................................................. 9-18
OFF Logic Input............................................................................................... 9-18
Ready Logic Input............................................................................................ 9-18
Chapter 10 – Flow Diagrams, I/O Schematics & Load Sheets
ALM-12d Flow Diagrams
Inputs, Caller Feeds, and Channel Logic ........................................................... 10-2
Monitors, Logic Ports.......................................................................................... 10-3
Master Outputs ................................................................................................... 10-4
Processor Board Schematic (PR-1214) .................................................................. 10-5
Processor Board Load Sheet (PR-1214)................................................................ 10-10
Switch Control Schematic (SW-1214) .................................................................... 10-11
Switch Control Load Sheet (SW-1214) .................................................................. 10-16
Monitor Card Schematic (MN-1214)....................................................................... 10-17
Monitor Card Load Sheet (MN-1214) ..................................................................... 10-19
Monitor Switch Card Schematic (MSW-1214)........................................................ 10-20
Monitor Switch Card Load Sheet (MSW-1214) ...................................................... 10-21
Logic Port Board Schematic (LP-1214).................................................................. 10-22
Logic Port Board Load Sheet (LP-1214) ................................................................ 10-24
Appendix
Replacement Parts List ............................................................... A-2
I N S T A L L A T I O N and P OWER
page 1 – 1
ALM-12d / Oct 2001
Installation and Power
Chapter Contents
Unpacking the Console ............................................................. 1-2
Countertop Mounting................................................................. 1-2
System Ground .......................................................................... 1-3
Power Supply ............................................................................. 1-4
The PSC-D340 Power Supply............................................................................1-4
Power Connector Pinout.....................................................................................1-5
PSC-D340 Power Supply Schematic ................................................................. 1-6
Failsafe Dual Redundant Supply........................................................................1-7
Energizing...........................................................................................................1-7
Audio and Control Wiring.......................................................... 1-7
Connection Procedures ......................................................................................1-8
Digital Audio Connections .................................................................................. 1-8
Unbalanced Connections (analog audio)........................................................... 1-8
Hand Crimp Tool Wiring Insrtuctions ...................................... 1-9
I N S T A L L A T I O N and P OWER
page 1 – 2
ALM-12d / Oct 2001
Installation and Power
Unpacking the Console
The ALM-12d console is shipped as two packages. One carton
contains the console and documentation and the second carton contains
the Power Supply and connecting cable.
Countertop Installation
The ALM-12d digital audio console is designed for countertop
mounting. Console placement should avoid proximity to any electromag-
netic fields, such as large power transformers, motors, and fluorescent
lighting fixtures.
The console extends approximately 6” above the countertop at the
meterbridge.
Do not connect the ALM-12d console to its power supply (and do
not connect the power supply to the AC power line) until instructed
to do so.
NOTE: This console
contains static-sensi-
tive devices. Normal
precautions against
static discharge should
be observed.
16.702
26.500 5.911
18.201
CONNECTOR HOUSINGS
17.559
2.180
24.500
3.750
I N S T A L L A T I O N and P OWER
page 1 – 3
ALM-12d / Oct 2001
CONSOLE
2-TRACK
MULTI-TRACK
AC BREAKER
BOX
DEVICE 1
DEVICE 2
DEVICE N
CONSOLE POWER SUPPLY
CONTROL ROOM POWER AMP
STUDIO POWER AMP
OTHER
POWER COMPANY
EARTH GROUND
HEAVY
(#4 or #6)
COPPER
WIRE
HIGH POWER
EQUIPMENT RACK
COPPER ROD
SOIL 3-wire ground or separate wire run from chassis
EFFECTS RACK
MIC PANEL
GND
TYPICAL SYSTEM
GROUNDING SCHEME
etc.
3–5 ft.
Tie the console ground lug
terminal strip to the system
earth ground. Tie every piece
of equipment in the entire
audio system to the console
ground lug terminal strip.
System Ground
The first step is to ground the console.
Note that as supplied from the factory, console rackmount power
supply common, audio ground, and the ALM-12d mainframe are
connected together at the console, but are NOT connected to electrical
ground and the chassis of the power supply. Safety requirements
dictate that a positive connection from the console mainframe to
electrical ground be made in the completed installation. Use the
grounding lug on the rear of the mainframe to establish your system
ground. The grounding lug may be found at the rear of the console, on
the rear frame panel, to the left if you are looking at the rear of the
console.
The system ground serves two important purposes:
(1) It provides a zero signal reference point for the entire audio system;
(2) It assures safety from electrical shock.
There exist two terms that one encounters in a discussion of ground:
(A) EARTH GROUND, which is usually a heavy copper rod driven into the
soil adjacent to the building (around 6 feet down) or a connection to the copper
water pipes leading into the building. Either is acceptable (unless, of course,
the water pipe is made of plastic).
I N S T A L L A T I O N and P OWER
page 1 – 4
ALM-12d / Oct 2001
(B) THE POWER COMPANY EARTH CONDUCTOR that enters the build-
ing at the power line breaker box; this conductor should be (and is often by code)
tied to the above-mentioned earth ground at one point. This point is the SYSTEM
EARTH GROUND.
TIE THE CONSOLE GROUND LUG TO THE SYSTEM EARTH
GROUND. TIE EVERY PIECE OF EQUIPMENT IN THE ENTIRE
AUDIO SYSTEM TO THE CONSOLE GROUND LUG. If the system
earth ground point is inaccessible, tie the console ground lug to the power
company earth conductor at the main breaker box (see drawing "Typical
Grounding Scheme" on previous page).
Each piece of equipment should be connected by its own ground wire
(usually the round third pin on the AC cord). This means that every AC
outlet must have a separate conductor run to the console ground lug; the
outlets cannot be daisy-chained as is normally encountered in commercial
and residential AC systems. Any equipment not supplied with 3-wire AC
cables must have individual ground wires (16 gauge or larger) connected
to their chassis grounds and then run to the console ground lug terminal
strip.
Further Grounding Details
Check all equipment to be absolutely certain that each unit is power
transformer isolated from the AC mains to prevent safety hazards.
It is assumed that in each piece of audio equipment the audio ground
and the chassis are tied together at some point. Any piece of equipment
lacking a grounded chassis is likely to be prone to interference problems.
Locate all unbalanced audio equipment in the same rack if possible, to
minimize chassis ground potential differences. It may also be helpful to
insulate each piece of unbalanced equipment from its mounting rails in the
rack by means of nylon 10-32 screws and insulating washers between rails
and faceplates.
Once the system is properly grounded, proceed with the console
power supply installation and connection (next section).
Power Supplies
The ALM-12d console is powered by a Wheatstone Model PSC-D340
rackmount power supply. This heavy duty unit occupies three 19” wide
rack spaces (total height 5-1/4”). Convection cooled, it requires ample
ventilation space above and below it. The PSC-D340 generates a lot of
heat in the course of normal operation — do not mount heat sensitive
devices in the same rack cabinet.
Note the power supply should be mounted in an equipment rack within
fifteen feet of the console (but no closer than 3 feet). Avoid locating any
high gain equipment (such as phono preamps, tape recorders, etc.) too near
the rackmount supplies, to avoid magnetic interference into that equip-
ment.
If failsafe redundant sup-
plies have been ordered,
you will be installing two
units and an additional
rackmount panel.
I N S T A L L A T I O N and P OWER
page 1 – 5
ALM-12d / Oct 2001
Once the supply is rackmounted, it should be connected to the
console using the factory supplied cable. The console’s power supply
connector is located at the rear of the console, at the right end of the
meterbridge bottom pan. If you are using one supply, connect it to the
console connector. If you are using two supplies (failsafe option),
connect the long power supply cable to the center connector of the
rackmount failsafe panel. Then connect one supply with a short cable to
either of the two remaining connectors on the failsafe panel and connect
the second supply with a short cable to the last connector. Note that the
power supply cable’s 10-pin female connector has to be rotated until its
locating pins match the male connector on the console. Do not force a
connector on; it attaches easily when properly aligned. Connect the
cable first to the console, then to the rear of the rackmount power supply.
Note each power supply is fitted with a 3-wire grounded AC cord that
should be plugged into a "clean" AC power source, that is, an AC source
that feeds only the control room audio gear. This source should be a
separate feed from those powering lighting, air-conditioning, or any
other non-audio machinery. The third pin ground wire of the AC source
should be tied to the central system ground point. Note that while the AC
power cord ground wire terminates at the power supply chassis, it does
NOT connect to the ALM-12d console common; the console itself must
be grounded separately. (See previous section, "System Ground".)
The power feed recom-
mended in the text is of-
ten installed and referred
to in studios as an “iso-
lated AC ground” outlet.
It is usually orange in
color.
The PSC-D340 Power Supply
HA
E D
I
J
B
C
G
F
TYPICAL POWER
CONNECTOR
(10-pin)
A :
B :
C :
D :
E :
F :
G :
H :
I :
J :
audio/phantom common
+V audio
-V audio
digital common
phantom power
digital common
+digital
+digital
n/c
n/c
ON
OFF
+VD1
PHANT
Model PSC-D340 Power Supply
D2
–
V
1
0
INSTALLATION and POWER
page 1 – 7
ALM-12d / Oct 2001
Failsafe Dual Redundant Supply
Wheatstone failsafe power supply systems use two separate rackmount
power supplies for each piece of powered equipment. Though either is
capable of running a full load on its own, in failsafe operation both units
run in tandem: if one fails, the other takes over, assuring uninterrupted
operation.
In order for failsafe systems to perform as designed, always have
BOTH rackmount supplies powered up and connected to their associated
equipment.
Energizing
Assuming the ALM-12d console mainframe is properly placed and
grounded, and its PSC-D340 power supply correctly rackmounted and
connected to the console, you may now energize the PSC-D340 rackmount
power supply by plugging it into the AC mains. The five LEDs on the
power supply front panel should light up to indicate the presence of their
respective voltages. The console's LED meters will illuminate and indi-
vidual module switches will assume factory default settings.
Once you have verified proper power-up, turn off the rackmount powerOnce you have verified proper power-up, turn off the rackmount power
Once you have verified proper power-up, turn off the rackmount powerOnce you have verified proper power-up, turn off the rackmount power
Once you have verified proper power-up, turn off the rackmount power
supply to de-energize the console. You may now proceed to wire up audiosupply to de-energize the console. You may now proceed to wire up audio
supply to de-energize the console. You may now proceed to wire up audiosupply to de-energize the console. You may now proceed to wire up audio
supply to de-energize the console. You may now proceed to wire up audio
and control connections.and control connections.
and control connections.and control connections.
and control connections.
Audio and Control Wiring
All audio and control I/O connections to the ALM-12d console are
made through multipin DB-25 connectors located on the rear panel of the
console.
The factory supplied hand crimping tool is used for all I/O wiring
connections to and from the console (see instruction on the page 1-9).
ALM-12d / Feb 2003
INSTALLATION and POWER
page 1 – 8
ALM-12d / Oct 2001
Connection Procedures
As supplied from the factory, the console requires no logic connections
to function. Therefore an orderly installation begins with the audio wiring.
Proceed through the manual, chapter by chapter, until all slots have been
wired to suit your particular installation requirements. Once proper audio
operation is verified, go back to Chapter 3 and proceed with control wiring.
Digital Audio Connections
CABLE - All AES/EBU input and output digital audio connections are
balanced and should be made using a high quality digital audio cable. Be
sure to select a digital audio cable with an integral drain wire of the same
wire gauge (AWG) as the twisted pair. Typical AES/EBU digital audio
cable has a very low characteristic capacitance per ft (pF/ft), and a nominal
impedance of 110Ω. High quality digital audio cable offers better signal
transmission performance versus typical analog audio cable, especially
over long cable runs. Check the cable manufactures data sheet to be sure
the cable you plan to use will work in your application.
CONNECTORS - All AES/EBU connections are made with the
supplied DB-25 connectors. These crimp style connectors will accept wire
gauge 24 - 28AWG.
SPDIF INPUTS - The SPDIF (Sony/Philips Digital Interface) or
“consumer” digital audio interface is a two wire unbalanced signal
typically on a single RCA style connector. To connect SPDIF devices to
the ALM-12d console simply wire the SPDIF center conductor (HOT) to
the digital input HI pin and SPDIF shell (ground) to the LO pin. Connect
the digital input SH at the console end only.
Unbalanced Connections (analog audio)
ANALOG INPUTS — Wire to the console with typical shielded two
conductor cable (like Belden 9451), just as if you were connecting a
balanced source. At the unbalanced source machine’s output, connect the
black wire (LO) to the shield.
ANALOG OUTPUTS — ALM-12d consoles use a balanced output
circuit which behaves exactly like the secondary of a high-quality trans-
former, with no center tap—this output is both balanced and floating.
Either the HI or LO side of the output should be strapped to ground, with
the output taken from the other side. (Normally you’d strap LO to ground,
and take HIGH to feed your unbalanced equipment.)
ALM-12d / Oct 2002
I N S T A L L A T I O N and P OWER
page 1 – 9
ALM-12d / Oct 2001
(2) The terminal conductor tabs with stripped wire
are placed in anvil 26-28.
HAND CRIMP TOOL WIRING INSTRUCTIONS
The supplied hand crimping tool (W/S#850068) is used for all I/O wiring
connections to and from the console. It is to be used with the supplied pin
(figure 1) intended for 24"-28" gauge wire.
1) Strip wire approximately 3/16" (insert in
proper wire stripper, rotate one half turn, and
pull insulation off wire).
2) Insert wire into terminal until wire
insulation is stopped by conductor tabs, and
place the conductor tabs on the anvil marked
as 26-28 (figure 2).
3) CRIMP by squeezing handles until jaws
are fully closed to secure wire in the terminal
(figure 3).
4) If there is an insertion error or if a
circuit change is needed, you'll need to use
the supplied pin extractor tool (W/S#850069)
to remove terminals, and correct your mistake
without having to sacrifice a connector. Place
extractor tip (red side) over pin terminal to be
removed (figure 4), and press it downwards
motion until tip rests upon Housing. Then
pull out the pin terminal from Housing. It
should never be necessary to discard a con-
nector due to a wiring error.
Note that metallized plastic hoods for
each connector are also supplied with the
console.
(3) Jaws fully closed; the insulation tabs have
been crimped.
(1) Pin crimp terminal
CONDUCTOR
TABS
INSULATION
TABS
INSULATION
STOPS HERE
(4) Place extractor tip over pin terminal to be
removed.
page 2 – 1
ALM-12d / Oct 2001
CONSOLE FEATURES
Console Features
Chapter Contents
Overview ..................................................................................... 2-2
Inputs .......................................................................................... 2-3
Analog Mono Mic Level Inputs ............................................................................... 2-3
Analog Stereo Line Level Inputs ............................................................................ 2-3
Digital Stereo Line Level Inputs.............................................................................. 2-3
Producer Talkback Input......................................................................................... 2-3
Sources ....................................................................................... 2-3
Faders ......................................................................................... 2-4
Outputs ....................................................................................... 2-4
Mutes and Tallies ....................................................................... 2-4
Other Features............................................................................ 2-5
Console Layout Drawing ........................................................... 2-6
page 2 – 2
ALM-12d / Oct 2001
CONSOLE FEATURES
Console Features
Overview
The ALM-12d console consists of twelve faders with associated switches a
dual fader PHONE section, also with associated switches, a MONITOR SEC-
TION, a CONTROL SECTION, and a TIMER SECTION. Each section is
described below.
The basic purpose of the console is to take some of the many audio signals that
are wired to the console inputs, and generate several outputs that combine these
inputs in various groups and at various degrees of loudness, or signal strength. The
typical application is in a radio station where it is desired to develop the signals that
the station will broadcast (the on air signal), as well as several additional signals
for recording and monitoring.
page 2 – 3
ALM-12d / Oct 2001
C O N S O L E FEATURES
Inputs
The ALM-12d console can accommodate up to twelve of the twenty two
available inputs in any combination (slots 1-12). Depending on the type of input
signal the slot will handle, it will be for mono microphone (-50dBu nominal),
stereo line analog (+4dBu balanced), or stereo line digital inputs.
The ALM-12d is designed to handle up to eight analog stereo line level
inputs. Two other stereo line inputs can be used for stereo signals or can be split
to provide four mono mic inputs (two each per stereo line input) instead.
The console can also handle up to eight digital stereo line level inputs, and
has two analog inputs dedicated to use as telephone caller inputs and an
additional analog mono Producer talkback input. Not all inputs are available at
the same time. An input must be selected by a FADER before it is available for
combination into a main output.
Analog Mono Mic Level Inputs
These inputs are used to connect to microphones, which typically put out
signals at relatively low signal strength, and therefore require more amplification
(increase in signal strength) to be properly audible in the output.
Analog Stereo Line Level Inputs
These outputs are typically used to connect to machines, such as tape decks,
cart machines, CD players, etc., that provide analog outputs.
Digital Stereo Line Level Inputs
These outputs are typically used to connect to machines, such as tape decks,
cart machines, CD players, etc., that provide digital outputs.
Producer Talkback Input
This input is provided to allow a line level signal from a remote location to
perform the talkback to Studio function. This input will only be heard in the
Studio output, and cannot be assigned to any fader or to any other monitor.
Sources (not exactly the same as inputs)
The word source is used to describe any audio signal that is used to drive a
particular section of the console. For the 12 FADERS, the source will be one of
the inputs to the console, but in the case of other sections of the console, such as
meters, monitors, and caller feeds, the source may be an input, or it may be one
of the console outputs, or buses.
For all 12 faders, the switched meters, and the Control Room and Studio
monitors, it is possible to have no source assigned by dialing up the selection
OFF. See the section on selecting sources for details.
Note: Mic level inputs
c
be wired to the inputs of t
internal mic preamps. Y
must then wire the m
preamp outputs over to t
line level analog inputs y
want to use them with.
ALM-12d / May 2002
/
