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opacheco

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Hi all!

I am searching a good lecture (technical and Scientific methods if this exits!!) about the where to place the diffusers in a hall or room??

I will appreciate any comment
Opacheco.
 
I know some criteria but no scientific anything for general in acoustics... There is a scientific explanation for almost all the acoustical phenomena but no for complete room treatment.

For example for choosing general room dimension you could use some of the existing criteria mostly used (like 1:1,4:1,9) or run an iteration and look which has the best modal distribution... There are no theorics in edges behaviour, for example the edge of your desk...

If you are going to build a control in general diffusers go in the back wall and ceiling where first reflections... for ceiling ussualy 2D PRD, for back wall 1D QRD is my choose.

Don't know anything about a room or hall as you ask, but best way should be move them around and listen what happens... If you find anything usefull please let me know!

JS
 
JS, Thanks for comments

Very interesting and logical analysis!!...but I am in the design process for a hall and I can't the option to do any test(because i don't built it!!), I need to proyect anly and be secure that I will propose, instance I can simulate it but I wanted to get some experience opinions.

I found similars methods for the Reflectors(first and second order reflectors, using the Mirror Source Criteria....that is a Method used in Opical analysis!!)....I thought find something similar for Diffusers.

I refuse to believe that there is no empirical criteria at least!!!!......

Opacheco.


 
A few chapters in this book might be useful.

JR

http://www.ethanwiner.com/book_toc.htm


PART 4 - ROOM ACOUSTICS, TREATMENT, AND MONITORING

Chapter 17 - Acoustic Basics

Room Orientation and Speaker Placement
Symmetry
Reflection Points
Calculating Reflection Points
Angling the Walls and Ceiling
Low Frequency Problems
Reverb Decay Time
Stereo Monitoring
Surround Monitoring
Summary

Chapter 18 - Room Shapes, Modes, and Isolation

Modal Distribution
Room Ratios
Modes, Nodes, and Standing Waves
ModeCalc Software
Room Anomalies
Odd Room Layouts
One Room Versus Two Rooms
Vocal Booths
Surface Reflectivity
Calculating Reflections
Isolation and Noise Control
Air Leaks
Room Within a Room
Summary

Chapter 19 - Acoustic Treatment

Acoustic Treatment Overview
Buy or Build?
Flutter Echo
Absorb or Diffuse?
Rigid Fiberglass
Absorption Specs
Material Thickness and Density
Acoustic Fabric
Wave Velocity, Pressure, and Air Gaps
Bass Traps
DIY Bass Traps
Free Bass Traps!
Diffusers
Treating Listening Rooms and Home Theaters
Bass In The Place
Front Wall Absorption
Treating Live Recording Rooms
Hard Floor, Soft Ceiling
Variable Acoustics
Treating Odd Shaped Rooms
Treating Large Venues
Room Equalization
Summary

This chapter includes 1 audio example.

Chapter 20 - Room Measuring

Why We Measure
How We Measure
Room Measuring Software
Configuring Room EQ Wizard
Using Room EQ Wizard
Interpreting the Data
Waterfall Plots
RT60 Reverb Time
Energy Time Curve
Using the Real Time Analyzer
Measuring Microphones
Microphones Comparison
The Results
Calibrating Loudspeakers
Summary

This chapter includes 3 audio examples.
 
Some good reading can be found if you search "Dr. Peter D'Antonio"
for example here, with documents links (if you are AES member of want to pay) http://mixonline.com/design/profiles/mix_interview_dr_peter_dantonio/

or maybe here
http://www.ime.usp.br/~kon/acmus/relacionados/AcousticDistortion.pdf
 

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