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Manual JBL de sonido

El manual esta en Ingles, no esta traducido

Table of Contents
Preface .. i
Chapter 1: Wave Propagation.. 1-1
Wavelength, Frequency, and Speed of Sound 1-1
Combining Sine Waves .. 1-2
Combining Delayed Sine Waves 1-3
Diffraction of Sound .. 1-5
Effects of Temperature Gradients on Sound Propagation . 1-6
Effects of Wind Velocity and Gradients on Sound Propagation .. 1-6
Effect of Humidity on Sound Propagation .. 1-7
Chapter 2: The Decibel . 2-1
Introduction .. 2-1
Power Relationships . 2-1
Voltage, Current, and Pressure Relationships . 2-2
Sound Pressure and Loudness Contours .. 2-4
Inverse Square Relationships .. 2-6
Adding Power Levels in dB 2-7
Reference Levels 2-7
Peak, Average, and RMS Signal Values. 2-8
Chapter 3: Directivity and Angular Coverage of Loudspeakers 3-1
Introduction .. 3-1
Some Fundamentals 3-1
A Comparison of Polar Plots, Beamwidth Plots, Directivity Plots, and Isobars .. 3-3
Directivity of Circular Radiators .. 3-4
The Importance of Flat Power Response .. 3-6
Measurement of Directional Characteristics . 3-7
Using Directivity Information . 3-8
Directional Characteristics of Combined Radiators .. 3-8
Chapter 4: An Outdoor Sound Reinforcement System 4-1
Introduction .. 4-1
The Concept of Acoustical Gain . 4-2
The Influence of Directional Microphones and Loudspeakers on System Maximum Gain .. 4-3
How Much Gain is Needed? . 4-4
Conclusion 4-5
Chapter 5: Fundamentals of Room Acoustics .. 5-1
Introduction .. 5-1
Absorption and Reflection of Sound . 5-1
The Growth and Decay of a Sound Field in a Room 5-5
Reverberation and Reverberation Time.. 5-7
Direct and Reverberant Sound Fields . 5-12
Critical Distance . 5-14
The Room Constant . 5-15
Statistical Models and the Real World . 5-20
Sound System Design Reference Manual
Table of Contents (cont.)
Chapter 6: Behavior of Sound Systems Indoors . 6-1
Introduction .. 6-1
Acoustical Feedback and Potential System Gain .. 6-2
Sound Field Calculations for a Small Room . 6-2
Calculations for a Medium-Size Room 6-5
Calculations for a Distributed Loudspeaker System . 6-8
System Gain vs. Frequency Response .. 6-9
The Indoor Gain Equation . 6-9
Measuring Sound System Gain .. 6-10
General Requirements for Speech Intelligibility .. 6-11
The Role of Time Delay in Sound Reinforcement . 6-16
System Equalization and Power Response of Loudspeakers . 6-17
System Design Overview .. 6-19
Chapter 7: System Architecture and Layout .. 7-1
Introduction .. 7-1
Typical Signal Flow Diagram 7-1
Amplifier and Loudspeaker Power Ratings .. 7-5
Wire Gauges and Line Losses 7-5
Constant Voltage Distribution Systems (70-volt lines) . 7-6
Low Frequency Augmentation—Subwoofers .. 7-6
Case Study A: A Speech and Music System for a Large Evangelical Church . 7-9
Case Study B: A Distributed Sound Reinforcement System for a Large Liturgical Church .. 7-12
Case Study C: Specifications for a Distributed Sound System Comprising a Ballroom,
Small Meeting Space, and Social/Bar Area . 7-16
Bibliography

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