Education & Training



Welcome to the EAW School of Physics.


There are many loudspeaker system design tools available today, but they all require the designer to understand the physics of sound. A drafting program can’t design a building and our system design applications don’t have an “Auto-Design” button to design a complete loudspeaker system. The best sound system designers spend their careers studying the fundemental physics that govern the behavior of sound. How sound propogates from a loudspeaker, the interaction of multiple sources, and a solid understanding of how the loudspeaker system interacts with the space in which they are used are all important and affect the overall performance of a system. We will be developing a series of articles and videos over the next few months to give you the foundation you need to become more successful. So get your mind into “learning mode” and be ready to dive in!

Basic physics video


Director of Support and Education Jerrold Stevens explains the fundamental physics of sound in simple “layman’s” terms including Propagation of Sound (through air), wavelength, level and frequency.


Speed of Sound calculations


Frequency and Wavelength are dependent on the Speed of Sound. The Speed of Sound changes as temperature changes. So, in version 2 of this video (below), Jerrold walks you step by step through the simple formula for calculating the Speed of Sound at any temperature.

Acoustics 101


infoCommRU
Acoustics 101 is our new, pure education video series covering the fundamental physics of Acoustics. We cover the basics of the behavior of sound from the practical perspective of a former electro-acoustic design consultant.

This material comes from one of the most popular live seminars at InfoComm Expos, “Principles of Arrayed Loudspeakers,” authored and presented by EAW’s Director of Support and Education, Jerrold Stevens. The videos include many demonstrations and measurements to fully illustrate the physics of sound.

Plus, the course has been approved by InfoComm International for CTS RUs!!


Acoustics 101 Course Outline:

Chapter 1 – Acoustics Fundamentals

 The Basics			
   Propagation of Sound		
   Frequency, wavelength, level	
   Speed of Sound	
   Frequency & Wavelengths
   Introduction to the dB			
 Behavior of Sound in Free Space		
   Point Source Theory	
   Inverse Square Law - Attenuation of Sound Outdoors	
   Line Source Physics
 Behavior of Sound Outdoors		
   Environmental effects	
   Refraction - Temperature/wind
   Air Loss

Chapter 2 – Introduction to Loudspeaker Acoustics

 Introduction to Measurements – The Spectrograph
 Point Source Theory vs Reality – Source Directivity
   Q
   Half-space loading/Baffles
   Horns		
 Interaction of Sources
   Comb Filtering
   Impulse response and arrival times
   Effects on frequency response

Chapter 3 – Multiple Source Loudspeaker Acoustics

 Interaction of sources
   Lobes/nulls
   Challenges of Field Measurements
   Effects of Interaction in Multi-way Loudspeakers		
   Crossover lobing error
   Transducer alignment
   Coaxial Designs	
 Low Frequency Arrays		
   Mid-bass arrays
   Subwoofer arrays

Chapter 4 – Line Array Acoustics (Currently in production)

 Beam forming
   Beam Steering
 Line arrays

Chapter 5 – Behavior of Sound Indoors – Room Acoustics (Currently in production)

 Behavior of Sound at boundaries		
   Wave vs Geometric Acoustics 
   Angle of Incidence/specular reflections
   Wave Diffraction	
   Scattering and Diffusion	
   Sound Absorption		
 Reverberation
   Calculating RT60 (Sabine)
   Measuring RT		
   The RT60 Curve		
   Alternate RT Equations (Fitzroy, Eyring)	
 Indoor Sound Attenuation		
  Critical Distance	
 Small room acoustics
   Room modes

The series is available for purchase through your local EAW Dealer. Contact us for more information.