JBL Professional Sound System Design Reference Manual Part 1.pdf

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JBL is known as an American company whose producing audio equipment for home market and professional, while the main product are loudspeakers there are also some sorts of audio equipment product launched by JBL. JBL On Stage Micro Blk, JBL On Time 400IHD, JBL On Time 200ID, JBL On Stage 400ID, JBL On Stage Micro Silver, JBL On Stage III, are only amongst of their popular products that is categorized as iPod dock. While in the Home audio category, they also have a lot of mainstream products as the following: JBL Cinema Sound, Array series, Control Series, HT Series, HTI Series, K2 Series, On-The-Go, Performance Series, SCS Series, Soundpoint Series, Studio L Series, Synthesis, JBL Duet, JBL ES series.

Sound System Design Reference Manual which is issued by JBL Pro, is not intended to accompany user as a guidance for JBL’s specific product, rather than, it serves as more technical literature for almost all products manufactured by JBL.

Taken from: Preface to the 1999 Edition by John Eargle: This third edition of JBL Professional’s Sound System Design Reference Manual is presented in a new graphic format that makes for easier reading and study. Like its predecessors, it presents in virtually their original 1977 form George Augspurger’s intuitive and illuminating explanations of sound and sound system behavior in enclosed spaces. The section on systems and case studies has been expanded, and references to JBL components have been updated.

The fundamentals of acoustics and sound system design do not change, but system implementation improves in its effectiveness with ongoing developments in signal processing, transducer refinement, and front-end flexibility in signal routing and control.

As stated in the Preface to the 1986 edition: The technical competence of professional dealers and sound contractors is much higher today than it was when the Sound Workshop manual was originally introduced. It is JBL’s feeling that the serious contractor or professional dealer of today is ready to move away from simply plugging numbers into equations. Instead, the designer is eager to learn what the equations really mean, and is intent on learning how loudspeakers and rooms interact, however complex that may be. It is for the student with such an outlook that this manual is intended.

Contents:

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


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