TOA a-503a Supplementary Manual
Table of Contents
Introduction............................................................................................................................................................................1
Chapter 1: Selecting An Amplifier......................................................................................................................2
Sound Sources..........................................................................................................................................2
Speaker Requirements........................................................................................................................2
System Function......................................................................................................................................2
Speaker Requirements........................................................................................................................2
System Function......................................................................................................................................2
Chapter 2: Amplifier Basics......................................................................................................................................4
Signal Flow..................................................................................................................................................4
Audio Levels...............................................................................................................................................8
Impedance................................................................................................................................................10
Audio Levels...............................................................................................................................................8
Impedance................................................................................................................................................10
Chapter 3: Amplifier/Speaker Matching.....................................................................................................11
Low Impedance Systems................................................................................................................11
High Impedance (70.7/25 Volt) Distributed Line Systems.....................................12
How to Design a High Impedance Distributed System...........................................13
High Impedance (70.7/25 Volt) Distributed Line Systems.....................................12
How to Design a High Impedance Distributed System...........................................13
Chapter 4: Wiring..........................................................................................................................................................14
Low Level and Line Level Wiring..............................................................................................14
Twisted Pair Wiring..............................................................................................................15
Shielded and Unshielded Cable.................................................................................15
Balanced and Unbalanced Lines...............................................................................15
Transformer Isolation.........................................................................................................16
Shielded and Unshielded Cable.................................................................................15
Balanced and Unbalanced Lines...............................................................................15
Transformer Isolation.........................................................................................................16
Speaker Level Wiring.........................................................................................................................16
Minimizing Line Loss..........................................................................................................16
Troubleshooting Guide...............................................................................................................................................17
Load Troubleshooting......................................................................................................................17
Power Tap to Impedance Conversion Chart....................................................................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
TOA Electronics Amplifier Guide