Auditronics ALM-12d Technical Manual

Brand: Auditronics

Model: ALM-12d

Category: Musical Equipment

Type: Technical Manual

ALM-12d Digital Audio Console

TECHNICAL MANUAL

October 2001

R-16 / Dec 1997

ALM-12d Digital Audio Console Technical Manual - 1st Edition

AUDITRONICS

600 Industrial Drive

New Bern, North Carolina 28562

252-638-7000

*a division of Wheatstone Corporation

ALM-12d / Oct 2001

ATTENTIONTTENTION

TTENTIONTTENTION

TTENTION

READEAD

EADEAD

EAD M M

M M

MEE

E!!

ALM-12d / Oct 2001

Attention!

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:

Radio FRadio F

Radio Frequency Noticerequency Notice

requency Noticerequency Notice

requency Notice

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 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.

This equipment must be installed and wired properly in order to assure

compliance with FCC regulations.

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

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

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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

E D

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

n/c

OFF

+VD1

PHANT

Model PSC-D340 Power Supply

–

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 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 audio

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

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

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Auditronics ALM-12d Technical Manual

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Model: ALM-12d

Category: Musical Equipment

Type: Technical Manual

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