MartinLogan Loudspeaker Systems Manuel d'utilisateur télécharger pdf (Page 8)

8 Room Acoustics

This is one of those areas that requires both a little back-

ground to understand and some time and experimentation

to attain the best performance from your system.

Your room is actually a component and an important part

of your system. This component is a very large variable

and can dramatically add to, or subtract from, a great

musical experience.

All sound is composed of waves. Each note has its own

wave size, with the lower bass notes literally encompassing

from 10’ feet to as much as 40’ feet. Your room participates

in this wave experience like a three dimensional pool with

waves reflecting and becoming enhanced depending on

the size of the room and the types of surfaces in the room.

Remember, your audio system can literally generate all of

the information required to recreate a musical event in

time, space, and tonal balance. The purpose of your room,

ideally, is to not contribute to that information. However,

every room does contribute to the sound, and the better

speaker manufacturers have designed their systems to

accommodate this phenomenon.

Let’s talk about a few important terms before we begin.

Terminology

Standing Waves

The parallel walls in your room will reinforce certain notes to

the point that they will sound louder than the rest of the audio

spectrum and cause “one note bass”, “boomy bass” or

“tubby bass”. For instance, 100Hz represents a 10’ feet

wavelength. Your room will reinforce that specific frequency

if one of the dominant dimensions is 10’ feet. Large objects

in the room such as cabinetry or furniture can help to minimize

this potential problem. Some serious “audiophiles” will literally

build a special room with no parallel walls just to help

eliminate this phenomenon.

Reflective Surfaces (near-field reflections)

The hard surfaces of your room, particularly if close to your

speaker system, will reflect some waves back into the room

over and over again, confusing the clarity and imaging of

your system. The smaller sound waves are mostly affected

here, and occur in the mid and high frequencies. This is

where voice and frequencies as high as the cymbals occur.

Resonant Surfaces and Objects

All of the surfaces and objects in your room are subject to

the frequencies generated by your system. Much like an

instrument, they will vibrate and “carry on” in syncopation

with the music, and contribute in a negative way to the

music. Ringing, boominess, and even brightness can occur

simply because they are “singing along” with your music.

Resonant Cavities

Small alcoves or closet type areas in your room can be

chambers that create their own “standing waves” and can

drum their own “one note” sounds.

Clap your hands. Can you hear an instant echo respond back?

You have near-field reflections. Stomp your foot on the floor.

Can you hear a “boom”? You have standing waves or large

panel resonances such as a poorly supported wall. Put your

head in a small cavity area and talk loudly. Can you hear a

booming? You’ve just experienced a cavity resonance.

Rules of Thumb

Hard vs. Soft Surfaces

If the front or back wall of your listening room is soft, it

might benefit you to have a hard or reflective wall in

opposition. The ceiling and floor should follow the same

basic guideline as well. However, the side walls should be

roughly the same in order to deliver a focused image.

This rule suggests that a little reflection is good. As a matter

of fact, some rooms can be so “over damped” with carpeting,

drapes and sound absorbers that the music system can

sound dull and lifeless. On the other hand, rooms can be

so hard that the system can sound like a gymnasium with

too much reflection and brightness. The point is that balance

is the optimum environment.

Breakup Objects

Objects with complex shapes, such as bookshelves, cabinetry

and multiple shaped walls can help break up those sonic

gremlins and diffuse any dominant frequencies.

Solid Coupling

Your loudspeaker system generates frequency vibrations

or waves into the room. This is how it creates sound.

Those vibrations will vary from 20 per second to 20,000

per second. If your speaker system is not securely planted

ROOM ACOUSTICS

Your Room

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MartinLogan Loudspeaker Systems Manuel d'utilisateur Page 8

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