Education & Training
- Educational Videos
- Training Videos
- Articles and Technical Resources
- Basic Acoustical Physics
- Acoustics 101 (Premium)
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 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.