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# Recent Room Acoustics Articles

#### Calculating Room Modes with ModeCalc

ModeCalc can help you design a new room that sounds as good as possible, or predict the low frequency behavior of an existing room. This tutorial explains the basics of room modes, and tells how to use ModeCalc and interpret its results. This text is also available as online Help when you run the program, so there's no need to print this page separately.

ModeCalc can help you design a new room that sounds as good as possible, or predict the low frequency behavior of an existing room. This tutorial explains the basics of room modes, and tells how to

Ethan Winer — August 30, 2004 20:00 in Room Acoustics

#### Helmholtz Resonant Absorber

A listening room, defined by its dimensions, can be mapped in terms of a series of pressure peaks and nulls, in all three dimensions. This refers to the creation of standing waves (modes), and the resultant sonic characteristic of the room at modal (essentially bass) frequencies. There are other considerations, such as the boundary effect, but this has less to do with specific modal treatment, and more to do with generalised treatment, and certainly with loudspeaker and listening position placement.

A listening room, defined by its dimensions, can be mapped in terms of a series of pressure peaks and nulls, in all three dimensions. This refers to the creation of standing waves (modes), and the

Adam P. Salisbury — August 30, 2004 20:00 in Room Acoustics

#### Physics Tutorial 2: The Physics of Hearing

The first thing we should understand about sound is that it is a mechanical wave. Any mechanical wave is a disturbance that travels through some material or substance, such as air, called a medium for the wave. Sound waves can travel through any kind of gas, liquid or solid medium.

This article describes the physics behind human hearing and sound waves. How the ear works and how we perceive sound is discussed.

Mike Duda — August 29, 2004 19:00 in Room Acoustics

#### Acoustical Measurements - What are They?

I have heard some people claim "I just listen and walk around the room and clap my hands and I know what to do." I would say this is another "myth". What is true, is that final tuning of a room often does require extensive and subjective listening.

I have heard some people claim "I just listen and walk around the room and clap my hands and I know what to do." I would say this is another "myth". What is true, is that final tuning of a room often

rives — August 24, 2004 20:00 in Room Acoustics

#### Introduction to Acoustics

Throughout this series we hope to educate and illustrate some of the fundamental points of room acoustics. This is by no means meant to be an intensive course on acoustics, which by the way, for those that are interested, we recommend and have a list of educational and training opportunities on our website. However, this will give the reader some fundamentals and resources that may help in solving their own acoustical needs and problems. In this introductory article we would like to accomplish a few goals: First will be to discuss many of the facts and myths that exist regarding acoustics. The second will be to give a very brief definition and description of some of the acoustical terms you may have heard. Lastly, we will discuss our direction in this series of articles.

Throughout this series we hope to educate and illustrate some of the fundamental points of room acoustics. This is by no means meant to be an intensive course on acoustics, which by the way, for

rives — August 24, 2004 20:00 in Room Acoustics

#### Getting the Right Acoustics for Your Listening Room

"The room is the first thing we start with and the last thing we think about." This statement is so often true. It's unfortunate because the room, as we often refer to it as the "invisible component" can easily make or break the system performance. Think about it, an amplifier company makes a state of the art amplifier capable of reproducing a signal with no more than 0.01 Total Harmonic Distortion, dynamic headroom above 110 dB, and gold plated connections to insure the best possible path for the signal. Then we put this amplifier together with speakers and other fine performing electronics into a room that delivers a bass boost of 12 dB at 80 Hz, a huge dip at 300 Hz, and another strong peak around 5 kHz to 10 kHz.

"The room is the first thing we start with and the last thing we think about." This statement is so often true. It's unfortunate because the room, as we often refer to it as the "invisible component"

rives — August 24, 2004 20:00 in Room Acoustics

#### Rooms Without Boundaries: Using RPG Diffusors

This month we have another guest writer, Jeff Madison from RPG. Jeff is the senior product application consultant in RPG's Home Theater Division. He spent his first years at RPG developing its computer modeling and acoustic testing capabilities. With a background in music and engineering, he enjoys the challenges of both large and small spaces...and golf.

This month we have another guest writer, Jeff Madison from RPG. Jeff is the senior product application consultant in RPG's Home Theater Division. He spent his first years at RPG developing its

Jeff Madison — August 24, 2004 20:00 in Room Acoustics

#### Room Modes and Dealing with Them

When the boundaries of a room accentuate bas frequencies, the listener's perception is one of a reduced midrange and soundstage. If you don't get the bass right, nothing ever comes together very well.

When the boundaries of a room accentuate bas frequencies, the listener's perception is one of a reduced midrange and soundstage. If you don't get the bass right, nothing ever comes together very

rives — August 24, 2004 19:00 in Room Acoustics