Toa A-503A Manual
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Toa A-503A Manual

Toa a-503a: supplementary guide
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TOA Electronics
INPUT 1
INPUT 1
INPUT 2
INPUT 2
BASS
BASS
TREBLE
TREBLE
UNSWITCHED AC 120V 60Hz
UNSWITCHED AC 120V 60Hz
MAX 500W 4A
MAX 500W 4A
REMT
REMT
VOL
VOL
70V
70V
DIRECT
DIRECT
25V
25V
MUTE
MUTE
4õ
8 8õ
1
MUTE
MUTE
2
GND
GND
COM
COM
120V
120V
AC
AC
60Hz
60Hz
60W
60W
MIC
MIC
TEL
TEL
PROGRAM
PROGRAM
AUX
AUX
0
10
0
10
0
10 10
0
10 10
120V 60Hz
120V 60Hz
SENSE
SENSE
MAX 500W
MAX 500W
UNIT
UNIT
OUTLET
OUTLET
PUSH
PUSH
PUSH
PUSH
BREAKER
BREAKER
BREAKER
BREAKER
RESET
RESET
RESET
RESET
4A 4A
4A 4A
0
PROGRAM
PROGRAM
TEL
TEL
MIC
MIC
G
COM
COM
HOT
HOT
G
COM
COM
HOT
HOT
G
COM
COM
HOT
HOT
NC
NC
UNSWITCHED
UNSWITCHED
-
OUTPUT 120W
OUTPUT 120W
OUTPUT 1W
OUTPUT 1W
MOH
MOH
MUTE
MUTE
120V 50Hz
120V 50Hz
150W
150W
COM
COM
4õ
25V
25V
70V
70V
8õ
COM
COM
600
600õ
COM
COM
G
0
CLASS 2 WIRING
CLASS 2 WIRING
DC FUSE
DC FUSE
250V 8A
250V 8A
AC FUSE
AC FUSE
250V 7A
250V 7A
MUTE
MUTE
MODULE
MODULE
0
10 10
A
B
PAGE
PAGE
BGM
BGM
BASS
BASS
TREBLE
TREBLE
AUX
AUX
0
0
-
+
-
+
PREAMP
PREAMP
POWER
POWER
OUT
OUT
IN IN
OUTPUT 1W
OUTPUT 1W
MOH
MOH
Amplifier Guide
INPUT 3
INPUT 3
INPUT 4
INPUT 4
INPUT 5
INPUT 5
TONE DEFEAT
TONE DEFEAT
LOW CUT
LOW CUT
OFF
OFF
ON
ON
OFF
OFF
ON
ON
MODULE
MODULE
SIGNAL
SIGNAL
PEAK
PEAK
POWER
POWER
0
10 10
ON
ON
OFF
OFF
MUTE
MUTE
MODULE
MODULE
10 10
A
B
PAGE
PAGE
BGM
BGM
BASS
BASS
TREBLE
TREBLE
AUX
AUX
0
0
+
-
+
PREAMP
PREAMP
POWER
POWER
OUT
OUT
IN IN
OUTPUT 1W
OUTPUT 1W
MOH
MOH
10 10
0
10 10
DC FUSE
DC FUSE
250V 8A
250V 8A
OU
R
LISTED
LISTED
COMMERCIAL
COMMERCIAL
AUDIO EQUIP.
AUDIO EQUIP.
111J
111J
UNSWITCHED AC 120V 60Hz
UNSWITCHED AC 120V 60Hz
MAX 500W 4A
MAX 500W 4A
REMT
REMT
VOL
VOL
70V
70V
DIRECT
DIRECT
25V
25V
MUTE
MUTE
4õ
8 8õ
1
MUTE
MUTE
2
GND
GND
COM
COM
120V
120V
AC
AC
60Hz
60Hz
60W
60W
INPUT 6
INPUT 6
INPUT 7
INPUT 7
INPUT 8
INPUT 8
NOR
PO
PWR
PWR
AMP
AMP
IN IN
PRE
PRE
ON
AMP
AMP
OUT
OUT
OFF
BRG
BRG
IN/
IN/
OUT
OUT
LOW CUT
LOW CUT
ON
ON
OFF
OFF
INPUT LEVEL
INPUT LEVEL
0dBV
0dBV
-20dBV
-20dBV
S.
SIGNAL
SIGNAL
NORMAL
NORMAL
PEAK
PEAK
PROTECT
PROTECT
POWER
POWER
MASTER
MASTER
ON
ON
OFF
OFF
AUX
AUX
OUT
OUT
PWR
PWR
AMP
AMP
IN IN
PRE
PRE
AMP
AMP
OUT
OUT
BRG
BRG
IN/
IN/
OUT
OUT
INPUT
INPUT
HOT
HOT
COM
COM

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Summary of Contents for Toa A-503A

  • Page 1 TOA Electronics INPUT 1 INPUT 1 INPUT 2 INPUT 2 INPUT 3 INPUT 3 BASS BASS TREBLE TREBLE TONE DEFEAT TONE DEFEAT UNSWITCHED AC 120V 60Hz UNSWITCHED AC 120V 60Hz MAX 500W 4A MAX 500W 4A REMT REMT DIRECT DIRECT...
  • Page 2 TOA Electronics Amplifier Guide...

  • Page 3: Table Of Contents

    Speaker Level Wiring...16 Minimizing Line Loss...16 Troubleshooting Guide...17 Load Troubleshooting...17 Power Tap to Impedance Conversion Chart...17 TOA Amplifier Overview...18 TOA Amplifier Comparison Chart...21-22 Appendix A: Wire Size Charts...A-1 Appendix B: Power Consumption & Thermal Dissipation...A-2 Table of Contents TOA Electronics Amplifier Guide...

  • Page 4: Introduction

    TOA Electronics Amplifier Guide Welcome to the TOA Amplifier Guide! TOA has been providing complete sound systems since 1934. After our first U.S. sales office was estab- lished in 1974, our TA-900 Series mixer/amplifiers quickly gained recognition for their unmatched combination of flexibility, reliability, and performance.

  • Page 5: Chapter 1: Selecting An Amplifier

    It is usually preferable to select the speakers, or at least the general type of speakers, before selecting the amplifier. Please refer to the TOA Speaker Guide for information on selection and place- ment of speakers. Once the type of speakers has been determined, it will be possible to choose an amplifier with adequate power and an appropriate output impedance.
  • Page 6 TOA Electronics Amplifier Guide specific until after the system is installed and they try to make it work. The designer’s job includes ask- ing enough questions in the beginning to make sure the design will meet the client’s needs. As a start, imagine yourself in the place of your client, using the system, and asking questions such as “where will this go?”...

  • Page 7: Chapter 2: Amplifier Basics

    TOA Electronics Amplifier Guide Chapter 2: Amplifier Basics Important Concepts: Signal Flow, Level and Impedance When designing and installing sound systems, mastery of some key concepts helps a great deal. A basic understanding of signal flow, levels, and impedance can increase your efficiency on the job, and dramatically reduce the number of costly call-backs.
  • Page 8 Hold (MOH) output bus. This bus is fed from the music input, and not affected by speaker processing modules or by mute functions used for the overhead paging (see fig. 2).TOA 900 Series amplifiers can provide an MOH output using the T-12S module, which provides for both the music input and the MOH output.
  • Page 9 Sources BG-M Series Phone System Mixer/Amplifier Microphone Dry Contact Closures (one pair per zone) Figure 3: Three-Zone Paging System Zone 1 Local BG-M Series Microphone Mixer/Amplifier To 'Tel' Input Mute Music Source Zone 2 Local BG-M Series Microphone Mixer/Amplifier To 'Tel' Input Mute Music Source Zone 3...
  • Page 10 Sources Podium Microphone Wireless Microphone CD/DVD Player VHS Player Audio Cassette Computer Audio Figure 4: Multimedia System Mixer/Amplifier D-901 Mixer/Processor Speakers IP-300D Amplifier P-924MK2 Amplifier P-912MK2 Amplifier P-906MK2 Amplifier...

  • Page 11: Audio Levels

    — with a lower-case “v”; so if you encounter dBv on an old spec sheet, it means dBu, not dBV. TOA Electronics Amplifier Guide What is RMS Power? An audio signal is defined by its amplitude (loudness) and frequency (pitch).
  • Page 12 (volume controls) between each stage to reduce the overall gain when needed. The mic pre-amp provides 32 to 52 dB of gain, bringing the mic level signal up to a level that can be matched with other line level sources. The summing amplifier provides additional gain, bringing all sources up to 0 dBV.

  • Page 13: Impedance

    5 to 20 times greater than the source impedance. So, for example, a 10,000 ohm input is a good “match” for a 600 ohm out- put. V x I W x R I x R Ohm's Law TOA Electronics Amplifier Guide...

  • Page 14: Chapter 3: Amplifier/Speaker Matching

    4 ohms and 8 ohms. This means that in most cases, you will be limited to one or two speakers per amp channel when con- necting low impedance speakers in parallel.

  • Page 15: High Impedance (70.7/25 Volt) Distributed Line Systems

    Amplifier Figure 8: High Impedance Distributed System Step-up Step-down Transformer Transformers 70 volt line 8 ohms (high impedance) TOA Electronics Amplifier Guide 8 ohms 8 ohms 8 ohms 8 ohms Speakers...

  • Page 16: How To Design A High Impedance Distributed System

    Help with this can be found in the TOA Speaker Guide. Once you know the type(s) of speaker(s) and how much power each one will need, determine what is the lowest available transformer tap that will sup- ply at least that much power to the speaker.

  • Page 17: Chapter 4: Wiring

    The “audio chain” analogy is an especially good one when talking about wiring. Like a chain, a sound system is only as good as its weakest link. The kinds of cables used and how they are connected can often be the difference between a great system and a useless one. Most experienced audio profes- sionals can tell stories about contractors who have saved a few pennies on installation and wiring costs, only to spend costly hours back on site correcting noise or other problems later.

  • Page 18: Twisted Pair Wiring

    TOA Electronics Amplifier Guide The two most popular methods to reduce the pickup of induced noises through sound system wiring are the use of twisted pair wiring, and the use of shielded cable. Twisted Pair Wiring Twisted pair wiring is just what it sounds like: two insulated conductors are twisted around each other over the length of the cable run.

  • Page 19: Transformer Isolation

    This power is wasted. Second, the wire will increase the total line resistance, causing the line to draw less power from the amp. This power is not wasted, but is just unused. Either way, it is best to keep line losses down to a minimum — preferably less than 1 dB.

  • Page 20: Troubleshooting Guide

    TOA ZM-104. Mastering this relatively simple measuring device can save hours of valuable field service time per job when tracking down existing problems, and most importantly, can help avoid call-backs by identifying mis-matched loads before the system is ever turned on.

  • Page 21: Toa Amplifier Overview

    • Insert jacks for connecting external signal processor • Protection circuitry prevents potential damage from overloads, short-circuit and overheating • Five year warranty TOA Electronics Amplifier Guide BG Series BG-115 BG-130 15/30 WATT 3-CHANNEL MIXER/AMPLIFIERS • Compactmixer/amplifiers for paging, background/...
  • Page 22 P-924MK2 60/120/240 WATT POWER AMPLIFIERS • Modular single-channel power amplifiers • Input module slot accepts most TOA plug-in modules for custom system configurations • 25 V, 70.7 V and 4 / 8 ohm speaker outputs • Direct input for connecting an external mixer or other source •...
  • Page 23 AMPLIFIERS • Modular design allows fast and easy custom configurations for unmatched flexibility • Six module slots accept TOA plug-in modules, expandable to eight slots with optional kit, model WE-2 • 25 V, 70.7 V and 4 / 8 ohm speaker outputs •...

  • Page 24: Toa Amplifier Comparison Chart

    TOA Electronics Amplifier Guide TOA Amplifier Comparison Chart Model Description Power A-706 Mixer/Amplifier 60 W A-712 Mixer/Amplifier 120 W A-724 Mixer/Amplifier 240 W A-503A Mixer/Amplifier 30 W A-506A Mixer/Amplifier 60 W A-512A Mixer/Amplifier 120 W A-901A Mixer/Amplifier 10 W A-903MK2 Mixer/Amplifier 30 W...

  • Page 25: Toa Amplifier Comparison Chart

    TOA Amplifier Comparison Chart Model Auto-Mute Phantom Output Power* A-706 Optional, User Configurable using T-02S A-712 “ “ A-724 “ “ A-503A — — Inputs 1 & A-506A — — A-512A — — A-901A Optional, Optional, using muting module using T-12S A-903MK2 “...

  • Page 26: Appendix A: Wire Size Charts

    TOA Electronics Amplifier Guide Appendix A: Wire Size Charts Table 1 Speaker Cable Lengths (ft) and Gauges (AWG) for 70.7 V Line with 1 dB Power Loss Wire Gauge 70.7 V (AWG) Load Power Load Impedance 24.5 12.2 Table 2 Speaker Cable Lengths (ft) and Gauges (AWG) for 25 V Line with 1 dB Power Loss...

  • Page 27: Appendix B: Power Consumption & Thermal Dissipation

    Power Consumption and Thermal Dissipation Model Power Consumption at Rated Output (Watts) A-503A A-506A A-512A A-706 A-712 A-724 A-901A A-903MK2 A-906MK2 A-912MK2 BG-115 BG-130 BG-1015 BG-1030 BG-1060 BG-1120 IP-300D 1040 IP-450D 1650 IP-600D 2080 M-900MK2 P-906MK2 P-912MK2 P-924MK2 W-906A W-912A...
  • Page 28 MAX 500W 4A MAX 500W 4A Fax: 905-564-3569 DIRECT DIRECT 4õ 8 8õ 120V 120V 60Hz 60Hz ©2004, TOA Electronics, Inc. Literature Order #: L-AMPGUIDE INPUT 2 INPUT 2 INPUT 3 INPUT 3 INPUT 4 INPUT 4 INPUT 5 INPUT 5 TREBLE...

This manual is also suitable for:

A-506aA-512aA-706A-712A-724A-901a ... Show all

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