3
Amplifi er Application Guide
Table of Contents
Introduction .................................................................................................. 4
Chapter 1: Crown Amplifi ers In-Depth ....................................................... 5
1.1 Rack Cooling ..................................................................................... 5
1.1.1 Fan-Assisted Models ................................................................. 5
1.1.2 Convection-Only Models ........................................................... 6
1.2
System
Wiring
................................................................................... 7
1.2.1
Input
Wiring
............................................................................... 7
Input
Connector
Wiring
................................................................. 7
Balanced, Grounded Source ........................................................ 7
Balanced, Floating Source ........................................................... 7
Unbalanced, Grounded Source, Twin-Lead Shielded Cable ......... 8
Unbalanced, Floating Source, Twin-Lead Shielded Cable ............ 8
Unbalanced, Grounded Source, Single-Conductor
Coax or Twisted-Pair Cable ......................................................... 8
Unbalanced, Floating Source, Single-Conductor
Coax or Twisted-Pair Cable ......................................................... 8
1.2.2 Solving Input Problems ............................................................. 9
1.3
Output
Wiring
.................................................................................. 10
1.3.1 Output Connector Wiring ......................................................... 10
5-Way Binding Post ..................................................................... 10
Barrier
Block
................................................................................ 11
Neutrik
®
Speakon
®
...................................................................... 11
1.3.2 Amplifi er Load Impedance ..................................................... 13
1.3.3 Determining Appropriate Speaker Wire Gauge ....................... 14
1.3.4 Loudspeaker Protection .......................................................... 15
1.3.5 Solving Output Problems ........................................................ 16
High-Frequency
Oscillations
....................................................... 16
Sub-Sonic
Currents
..................................................................... 16
1.3.6 Distributed Speaker Systems .................................................. 17
What is Constant Voltage? .......................................................... 17
Transformer
Saturation
................................................................ 17
1.4 Multi-way Systems (with Expansion Modules) ................................ 18
1.4.1 Active vs. Passive Crossover Networks .................................. 18
1.5 Fault Monitoring .............................................................................. 20
1.6 Setting System Gain Structure ........................................................ 21
1.6.1 System Levels ......................................................................... 21
1.6.2 Amplifi er Level ......................................................................... 21
Chapter 2: Troubleshooting ...................................................................... 23
2.1 No Power ......................................................................................... 24
2.2 No Sound ........................................................................................ 25
2.3 Bad Sound ...................................................................................... 26
2.4 Amp Overheating ............................................................................ 26
Chapter 3: Glossary of Terms ................................................................... 27
Appendix: Suggested Reading ............................................................... 33